cbse class ix sample papers for summative assessment

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MATHEMATICS-IX (Term-II)Model Test Paper-1 (Unsolved)

[For S.A.-II (Term - II)]

Time : 3 hours M.M. : 90

General Instructions : Same as in Sample Question Paper.

SECTION A

(Question numbers 1 to 8 carry 1 mark each. For each question, four alternative choiceshave been provided of which only one is correct. You have to select the correct choice.)

1. In the given figure, PQRS is a rectangle.If ∠RPQ = 30°, then the value of (x + y) is :

(a) 90° (b) 120°

(c) 150° (d) 180°

2. In the figure, if area of parallelogram ABCD is 30 cm2,then ar (ADE) + ar (BCE) is equal to :

(a) 20 cm2 (b) 30 cm2

(c) 15 cm2 (d) 25 cm2

3. In the figure, chord AB is greater than chord CD. OL andOM are the perpendiculars from the centre O on these twochords as shown in the figure. The correct relationbetween OL and OM is :(a) OL = OM (b) OL < OM(c) OL > OM (d) none of these

4. Ratio of the volume of a cone and a cylinder of same radius of base and same height is :(a) 1 : 1 (b) 1 : 2 (c) 1 : 3 (d) 1 : 4

5. 29, 32, 48, 50, x, x + 2, 72, 78, 84, 95 are written in ascending order. If median of datais 63, then x is :(a) 62 (b) 63 (c) 124 (d) 126

6. In the given figure, ABCD is a rhombus. If ∠OAB = 35°,then the value of x is :(a) 25° (b) 35°(c) 55° (d) 70°

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7. If the slant height of a cone is 13 cm and the base radius is 5 cm, then the height ofcone is :

(a) 12 cm (b) 8 cm (c) 10 cm (d) 18 cm

8. If P(E) denotes the probability of an event E, then :(a) P(E) < 0 (b) P(E) >1(c) 0 < P(E) < 1 (d) –1 < P(E) < 1

SECTION B

(Question numbers 9 to 14 carry 2 marks each.)9. The cost of 6 eggs is the same as the cost of one bread. Express this statement as a

linear equation in two variables. (Take the cost of one egg to be Rs x and that of abread to be Rs y).

10. In the figure, ABCD is a quadrilateral and BD is oneof its diagonals. Show that ABCD is a parallelogramand find its area.

11. In the figure, ABCD is a rectangle. P and Q are themid-points of AD and DC respectively. Find thelength of PQ.

12. AOB is a diameter of a circle and C is a point on the circle. Check whetherAC2 + BC2 = AB2 is true or not.

OR

For what value of x in the figure, points A, B, C and D areconcyclic?

13. If the edge of a cube is doubled, what is the ratio of the volume of the first cube tothat of the second cube?

14. A die is thrown 225 times and the results were as follows :Outcomes 1 2 3 4 5 6

Frequencies 34 50 16 71 24 30Find the probability of getting a prime number.

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SECTION C

(Question numbers 15 to 24 carry 3 marks each.)

15. Draw the graph of the equation 2y – x = 7 and determine from the graph whetherx = 3, y = 2 is its solution or not.

16. Determine the point on the graph of the linear equation 2x + 5y = 19 whose ordinate

is 112 times its abscissa.

17. The angles between two altitudes of a parallelogram through the vertex of an obtuseangle of the parallelogram is 60°. Find the angles of the parallelogram.

ORABCD is a trapezium with parallel sides AB = a cm and DC = b cm. E and F are themid-points of the non-parallel sides. Show that the ratio of ar(ABFE) and ar(EFCD)is (3a + b) : (a + 3b).

18. Construct a triangle whose sides are 4.2 cm, 3.9 cm and 6.1 cm. Bisect its greatestangle and measure each part.

19. If the perpendicular bisector of a chord AB of a circle PXAQBY intersects the circleat P and Q, prove that arc PXA ≅ arc PYB.

20. The total surface area of a solid cylinder is 462 cm2 and its curved surface area is onethird of its total surface area. Find the radius of the cylinder.

21. A hemispherical vessel full of water is emptied in a cone. The radii of the vessel andthe cone are 12 cm and 8 cm respectively. Find the height of the water in the cone.

ORA shopkeeper has one spherical ladoo of the radius 5 cm. With the same amount ofmaterial, how many ladoos of radius 2.5 cm can be made?

22. Prepare a continuous grouped frequency distribution from the following data :

Mid-point Frequency

5 4

15 8

25 13

35 12

45 6

Also find the size of class intervals.

4

23. Show that if diagonals of a quadrilateral bisect each other at right angles, then it is arhombus.

24. Find the mean of the following data :

x 4 6 8 10 12

f 4 8 14 11 3

ORA class consists of 50 students out of which 30 are girls. The mean of marks scored bygirls in a test is 73 and that of boys is 71. Find the mean score of the whole class.

SECTION D

(Question numbers 25 to 34 carry 4 marks each.)25. Draw the graph of the linear equation 2x + 3y = 12. At what points, the graph of the

equation cuts the x-axis and the y-axis?26. E and F are points on diagonal AC of a parallelogram ABCD such that AE = CF. Show

that BFDE is a parallelogram.

27. Diagonals AC and BD of a quadrilateral ABCD intersect at O in such a way thatar(AOD) = ar(BOC). Prove that ABCD is a trapezium.

28. Prove that the angle subtended by an arc at the centre is double the angle subtendedby it at any point on the remaining part of the circle.

29. A cloth having an area of 165 m2 is shaped into the form of a conical tent of radius5 cm.

(i) How many students can sit in the tent if a student on an average, occupies 57 m2

on the ground?(ii) Find the volume of the cone.

OR

The surface area of a sphere of radius 5 cm is five times the area of the curved surfaceof a cone of radius 4 cm. Find the height and volume of the cone.

30. Draw a histogram for the following data :

Class-interval : 25-29 30-34 35-39 40-44 45-49 50-54

Frequency : 8 15 23 20 10 9

31. Show that the diagonals of a rhombus are perpendicular to each other.OR

Show that a diagonal of a parallelogram divides it into two congruent triangles andhence prove that the opposite sides of a parallelogram are equal.

32. The parking charges of a car in a parking lot is Rs 30 for the first two hours and Rs 10for subsequent hours. Taking total parking time to be x hours and total charges asRs y, write a linear equation in two variables to express the above statement. Draw agraph for the linear equation and read the charges for five hours.

33. Draw a frequency polygon for the following distribution :

Class interval Frequency

10 19 20

29 15

30

−−−−−

20

39 45

40 49 60

45 60 12

6660 70 6

70 85 15

−−

34. Metal spheres, each of radius 2 cm are packed into a rectangular box of dimensions16 cm × 8 cm × 8 cm. When 16 spheres are packed in the box, it is filled withpreservative liquid. Find the volume of this liquid to the nearest integer. [use π = 3.14]

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SECTION A


1. Diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90° and ∠BDC = 50°,then ∠OAB is :(a) 90° (b) 50° (c) 40° (d) 10°

2. In the figure, the area of parallelogram ABCD is :

(a) AB × BM (b) BC × BN

(c) DC × DL (d) AD × DL

3. In the figure, AB and CD arc two equal chords of a circlewith centre O. OP and OQ are perpendiculars on chordsAB and CD respectively, if ∠POQ = 150°, then ∠APQ is :(a) 30° (b) 75°(c) 15° (d) 60°

4. The class mark of the class 90-120 is :(a) 90 (b) 105 (c) 115 (d) 120

5. The total surface area of a cube 96 cm2. The volume of the cube is :(a) 8 cm3 (b) 512 cm3 (c) 64 cm3 (d) 27 cm3

6. In the figure, if ∠ABC = 20°, then ∠AOC is equal to :

(a) 20° (b) 40°(c) 60° (d) 10°

7. Base area of a cylinder is 154 sq cm. Its height is 5 cm. Then its volume is :(a) 308 cubic cm (b) 770 cubic cm (c) 525 cubic cm (d) 600 cubic cm

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8. In a class, there are x girls and y boys. A student is selected at random, then theprobability of selecting a boy is :

(a)x

y (b)x

x y( )+ (c)y

x y( )+ (d)y

x

SECTION B

(Question numbers 9 to 14 carry 2 marks each.)9. Write each of the following equations as equations in two variables.

(i) x = 17 (ii) y = –510. Show that each angle of a rectangle is a right angle.

ORThe lengths of the diagonals of a rhombus are 24 cm and 18 cm. Find the length of eachside of the rhombus.

11. In the figure, ABCD is a parallelogram, if area of ΔAEBis 16 cm2, then find the area of ΔBFC.

12. Calculate the length of a chord which is at a distance 5 cm from the centre of a circlewhose radius is 13 cm.

13. The rectangular sheet of paper 22 cm × 15 cm is rolled along its length to form ahollow cylinder. Find the radius of the cylinder thus formed.

14. In a sample study of 420 people, it was found that 240 people were governmentemployees. If a person is selected at random, find the probability that the person is nota government employee.

SECTION C


15. Draw the graph of the equation 5x – 3y = 1. Find four solutions of the equation. Usingthe graph check whether x = 2 and y = 3 is a solution of the equation.

16. In a parallelogram, AP and CQ are perpendiculars from A and C on its diagonal BD.Prove that AP = CQ.

17. In the figure, PSDA is a parallelogram, points Qand R are taken on PS such that PQ = QR = RSand PA || QB || RC.Prove that ar (PQE) = ar (CFD).

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ORIn the figure, E is any point on median AD of a ΔABC.Show that ar(ABE) = ar(ACE).

18. Construct a ΔXYZ in which ∠Y = 30°, ∠Z = 90° and XY + YZ + ZX = 11 cm.19. Find the points where the graph of the equation 3x + 4y = 12 cuts the x-axis and the

y-axis.20. A sphere of radius r has been cut into two hemispheres. Find the ratio of the surface

area of the original sphere to the total surface area of the two hemispheres.

OR

The radius of a roller, 1.2 m long is 0.42 m. If it takes 200 complete revolutions tolevel a playground, find the area of the playground.

21. The dimensions of a cuboid are in the ratio 3 : 2 : 1. If the lateral surface area of thecuboid is 360 cm2, find its total surface area.

22. Given below are the seats won by different political parties in the polling outcome ofa state assembly elections :

Political party A B C D E F

Seats won 75 55 37 29 10 37

(i) Draw a bar graph to represent the polling results.(ii) Which political party won the maximum number of seats?

OR

Find the median of 40, 42, 120, 99, 61, 92, 71, 58, and 58. If 56 is replaced by 85then find the new median.

23. In a one day cricket match, a batsman played 40 balls. The runs scored are as follows :

Runs scored 0 1 2 3 4 6

No. of balls 13 15 5 1 4 2

Find the probability that the batsman will score(i) 6 runs (ii) 0 or 4 or 6 runs.

24. Prove that equal chords of a circle subtend equal angles at the centre.

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SECTION D


25. The linear equation that converts Fahrenheit (F) to Celsius (C) is given by the relation

C = 5F – 160

9 .

(i) If the temperature is 86°F, what is the temperature in Celsius ?(ii) If the temperature is 35°C, what is the temperature in Fahrenheit ?

(iii) If the temperature is 0°F, what is the temperature in Celsius ?(iv) What is the numerical value of the temperature which is same in both the scales ?

26. ABC is an isosceles triangle in which AB = AC. A circle passing through B and Cintersects AB and AC at D and E respectively. Prove that BC || DE.

27. In the figure, AP || BQ || CR. Prove thatar(AQC) = ar(PBR)

28. Show that the diagonals of a rhombus are perpendicular to each other.29. A right triangle with sides 6 cm, 8 cm and 10 cm is revolved about the side 8 cm. Find

the volume and the curved surface area of the solid thus generated.

OR

A sphere and a right circular cylinder of the same radius have equal volumes. By whatpercentage does the diameter of the cylinder exceeds its height?

30. Draw a frequency polygon for the following distribution.

Marks 0-10 10-20 20-30 30-40 40-50 50-60

No. of students 3 7 12 8 6 431. ABCD is a parallelogram. On diagonal BD are points P and Q such that DP = BQ. Show

that APCQ is a parallelogram.

ORAD is the median of ∆ABC. E is the mid-pointof AD. BE produced meets AC at F. Show that

AF = 1

3AC.

32. Circumference of the base of a cylinder, open at the top, is 132 cm. The sum of radiusand height is 41 cm. Find the cost of polishing the outer surface area of cylinder at the

rate Rs 10 per square dm (decimetre). use = 22

7π⎡

⎣⎢⎤⎦⎥

33. Construct a histogram for the following data :


10 19 20

29 15

30

−−−−−

20

39 45

40 49 60

50 59 75

34. A water tank is getting filled up by water flowing at the rate of 15 cm3/sec. If thevolume of water filled in y seconds is x cm3, write a linear equation in two variablesto represent this situation. Draw a graph for the equation formed and hence find thevolume of water filled in 9 seconds.

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SECTION A


1. The dimensions of a room are 4 m × 3 m × 2 m. The area of the four walls of theroom is :(a) 28 m2 (b) 56 m2 (c) 60 m2 (d) 70 m2

2. A coin is tossed 100 times and head appears 64 times. The probability of getting atail is :

(a)1825 (b)

925 (c) 0 (d) 1

3. In the figure, O is the centre of the circle. If ∠AOB = 160°.Then ∠ACB is :(a) 160° (b) 200°(c) 80° (d) 100°

4. The sum of the lengths of bases of a trapezium is 13.5 cm and its area is 54 cm2. Thealtitude of the trapezium is :(a) 9 cm (b) 6 cm (c) 8 cm (d) 12 cm

5. In the figure, D is the mid-point of AB and DE || BC,then AE is equal to :(a) AD (b) EC(c) DB (d) BC

6. In the figure, O is the centre and AB = BC.If ∠BOC = 80°, then ∠AOB is :

(a) 80° (b) 70°(c) 85° (d) 90°

7. The area of the base of a solid hemisphere is 36 cm2. Its curved surface area is :(a) 36 cm2 (b) 72 cm2 (c) 108 cm2 (d) 98 cm2

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8. The range of the data 25.7, 16.3, 2.8, 21.7, 24.3, 22.7, 24.9 is :(a) 22 (b) 22.9 (c) 21.7 (d) 20.5

SECTION B


9. If (2, 5) is a solution of the equation 2x + 3y = m. Find the value of m.10. In the figure, ΔABC is an equilateral triangle. Find

∠BDC and ∠BEC.

11. In the figure, ABC is a triangle and AD is one of its medians. Find the ratio of areasof triangles ABD and ACD.

12. The class-marks of the distribution are 11, 14, 17, 20, 23, 26 and 29. Find the widthof the class and the true class limits.

13. A sphere is inscribed in a cube. Find the ratio of the volume of the cube to the volumeof the sphere.

14. Find the measure of each angle of a parallelogram, if one of its angles is 30° less thanthe twice the smaller angle.

ORDiagonals AC and BD of a parallelogram ABCD intersect each other at O.If OA = 3 cm and OD = 2 cm, find the lengths of AC and BD.

SECTION C

(Question numbers 15 to 24 carry 3 marks each.)15. For what value of p, the linear equation 2x + py = 8 has equal values of x and y for

its solution?16. Frame a linear equation in the form ax + by + c = 0 by using the given values of

a, b and c.(i) a = –2, b = 3, c = 4 (ii) a = 5, b = 0, c = –1

17. In a quadrilateral ABCD, AO and BO are the bisectors of ∠A and ∠B respectively.

Prove that ∠AOB = 12 (∠C + ∠D).

18. Construct a triangle PQR in which QR = 6 cm, ∠Q = 60° and PR – PQ = 2 cm.

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19. In a circle of radius 5 cm, there are two parallel chords of length 6 cm and 4 cm. Findthe distance between them when they are on opposite sides of the centre.

OR

In the figure, if AB = AC, ∠BEC = 100° then, find thevalue of x and y.

20. There are two cones. The curved surface area of one cone is twice that of the other. Theslant height of the later is twice that of the former. Find the ratio of their radii.

ORThe solid sphere of radius 4 cm is melted and then cast into smaller spherical balls ofdiameter 0.8 cm. Find the number of these balls.

21. The sum of height and radius of the base of a solid cylinder is 37 cm. Total surface areaof the cylinder is 1628 cm2. Find its volume.

22. If the mean of the following data is 20.2, find the value of p.

x 10 15 20 25 30

f 6 8 p 10 6

23. Following table give the distribution of time taken to solve a problem by 40 students :

Time in sec. 10 – 20 20 – 30 30 – 40 40 – 50 50 – 60

No. of students 6 8 12 10 4

Draw a histogram to represent the above data.

ORThirty children were asked about the number of hours they watched TV programmesin the previous week. The result were found as follows :

1 6 2 3 5 12 5 8 4 810 3 4 12 2 8 15 1 17 63 2 8 5 9 6 8 7 14 12

(i) Make a grouped frequency distribution table for this data, taking class width 5 andone of the class intervals as 5 – 10.

(ii) How many children watched television for 15 or more hours a week?

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24. In the figure, AD is the median. Prove that ar(∆ABD) = ar(∆ACD).

SECTION D


25. Draw the graph of the equation y = –x + 1 and find the point where the graph meetsthe axes.

26. In a triangle ABC, median AD is produced to X such that AD = DX. Prove that ABXCis a parallelogram.

27. Prove that the parallelograms on the same base and between the same parallels are equalin area.

ORTriangles ABC and DBC are on the same base BC with vertices A and D onopposite sides of BC such that ar (ABC) = ar (DBC). Show that BC bisects AD.

28. In the figure, PQ and RS are two parallel chords of a circle.When produced RP and SQ meet at O. Prove that OP = OQ.

29. Water in a rectangular reservoir having base 80 m × 60 m is 6.5 m deep. In what timecan the water be emptied by a pipe of which the cross section is a square of side20 cm, if the water runs through the pipe at the rate of 15 km/hr?

ORA hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost oftin-plating it on the inside at the rate of Rs 16 per 100 cm2.

30. Prove that a line segment joining the mid-points of any two sides of a triangle is paralleland half of its third side.

31. Rita and Geeta, two students of class IX, together contributed Rs 100 towards Prime-Minister’s Relief Fund to help the earthquake victims. Write a linear equation with thisdata satisfied. Draw the graph of the same.

32. The runs scored by two teams A and B on the first 60 balls in a cricket match are givenbelow :

No. of balls Team A Team B1–6 2 57–12 1 6

13–18 8 219–24 9 1025–30 4 531–36 5 637–42 6 343–48 10 449–54 6 855–60 2 10

Represent the data of both the teams on the same graph by frequency polygons.

33. Sum of the radius of the base height of a cylinder is 37 cm. Its total surface area is

1628 sq cm. Find its volume. use =22

7π⎛

⎝⎜⎞⎠⎟

34. Mean of 50 observations was found to be 80.4. But later on it was discovered that 96was misread as 69 at one place. Find the correct mean. If to each observation a constantvalue k is added, how is the mean affected?

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SECTION A


1. In the figure, D and E are mid-points of AB and AC respectively. The length ofDE is :(a) 8.2 cm (b) 5.1 cm(c) 4.9 cm (d) 4.1 cm

2. The areas of a parallelogram and a triangle are equal and they lie on the same base. Ifthe altitude of the parallelogram is 2 cm, then the altitude of the triangle is :(a) 4 cm (b) 1 cm (c) 2 cm (d) 3 cm

3. In the figure, if O is the centre of the circle and A is a pointon the circle such that ∠CBA = 40° and AD ⊥ BC, then thevalue of x is :(a) 50° (b) 90°(c) 45° (d) 40°

4. In a medical examination of students of a class, the following blood groups arerecorded :

Blood group A AB B ONo. of students 10 13 12 5

A student is selected at random from the class. The probability that he/she has bloodgroup B, is :

(a)14

(b)1340 (c)

310 (d)

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5. The volumes of two spheres are in the ratio 64 : 27. The ratio of their radii is equal to :(a) 4 : 3 (b) 3 : 4 (c) 16 : 9 (d) 16 : 27

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6. In the figure, O is the centre of the circle. If OA = 5cm, AB = 8 cm and OD is perpendicular to AB, thenCD is equal to :(a) 2 cm (b) 3 cm

(c) 4 cm (d) 5 cm

7. The mean of 10 numbers is 55. If one number is excluded, their mean becomes 50, theexcluded number is :(a) 60 (b) 70 (c) 80 (d) 100

8. Diameter of the earth is four times (approximately) the diameter of the moon, then theratio of their surface areas is :(a) 4 : 1 (b) 8 : 1 (c) 16 : 1 (d) 64 : 1

SECTION B

(Question numbers 9 to 14 carry 2 marks each)

9. Find the solution of the linear equation 2x + 5y = 10 which represents a point on(i) x-axis (ii) y-axis

10. If the two adjacent angles of a parallelogram are (3x – 20)° and (50 – x)°, then findthe value of x.

11. In a parallelogram ABCD, AB = 10 cm. The altitude corresponding to the sides AB andAD are respectively 7 cm and 8 cm. Find AD.

12. In the figure, A, B and C are three points on a circlewith centre O such that ∠BOC = 30° and ∠AOB = 60°.If D is a point on the circle other than the arc ABC,find ∠ADC.

13. The curved surface area of a cylinder is 4400 cm2 and the circumference of its base is110 cm. Find the height of the cylinder.

14. The mean of 10, 12, 18, 13, x and 17 is 15. Find the value of x.

ORThe points scored by a basket ball team in a series of matches are as follows :

17, 2, 7, 27, 25, 5, 14, 18, 10, 24, 48, 10, 8, 7, 10, 28.

Find the median for the data.

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SECTION C

(Question numbers 15 to 24 carry 3 marks each.)15. If the radius of a sphere is increased by 10%, by how much per cent will its volume

increase?OR

Three solid spheres of iron whose diameters are 2 cm, 12 cm and 16 cm respectivelyare melted into a sphere. Find the radius of the new sphere.

16. The radius and height of a cylinder are in the ratio 2 : 3. If the volume of the cylinderis 1617 cm3, find its radius and height.

17. Solve the equation 2x + 1 = x – 3 and represent the solution (s) on(i) the number line (ii) the cartesian plane.

18. Give the equations of two lines passing through (2, 14). How many more such lines arethere and why?

19. If the mid-points of the sides of a quadrilateral are joined in order, prove that the areaof the parallelogram so formed will be half of that of the given quadrilateral.

20. The mean of the following distribution is 50.

x 10 30 50 70 90

f 17 5p + 3 32 7p – 11 19

Find the value of p and hence the frequencies of 30 and 70.

ORConstruct a frequency distribution table for the following data of marks obtained by 25students in a test in Mathematics in a school. Take 20-30 (30 not included) as one of theclasses :9, 25, 17, 12, 28, 20, 7, 31, 14, 43, 11, 19, 23, 37, 6, 24, 48, 10, 32, 17, 40, 31, 18, 24, 29

Now find the following :(i) the number of students getting less than 40 marks.(ii) the number of students getting 30 or more marks.

21. Over the past 200 working days, the number of defective parts produced by a machineis given below :

No. of defective parts 0 1 2 3 4 5 6 7 8 9 10 11 12 13

Days 50 32 22 18 12 12 10 10 10 8 6 6 2 2

Determine the probability that tomorrow’s output will have :(i) no defective part

(ii) not more than 5 defective parts(iii) more than 13 defective parts?

19

22. Construct a rhombus whose side is of length 3.4 cm and one of its angles is 45°.23. If a line intersects two concentric circles (circles with the

same centre) with centre O at A, B, C and D, prove thatAB = CD. (see figure)

24. ABCD is a rhombus and P, Q, R and S are the mid-points of the sides AB, BC, CD andDA respectively. Show that the quadrilateral PQRS is a rectangle.

ORIn a parallelogram show that the angle bisectors of two adjacent angles intersect atright angles.

SECTION D

(Question numbers 25 to 34 carry 4 marks each.)25. If the work done by a body on application of a constant force is directly proportional

to the distance travelled by the body, express this in the form of an equation in twovariables and draw the graph of the same by taking the constant force as 3 units. Alsoread from the graph the work done when the distance travelled by the body is :(i) 2 units (ii) 0 units.

26. A cylindrical tube opened at both ends is made of iron sheet which is 2 cm thick. If theouter diameter is 16 cm and its length is 100 cm, find how many cubic centimetres ofiron has been used in making the tube.

ORThe volume of two spheres are in the ratio 64 : 27. Find the radii, if the sum of theirradii is 21 cm.

27. A random survey of the number of children of various age groups playing in a park wasfound as follows :

Age (in years) Number of children

1 – 2 52 – 3 33 – 5 65 – 7 12

7 – 10 910 – 15 1015 – 17 4

Draw a histogram to represent the data above.

28. Triangles ABC and DBC are on the same base BC with vertices A and D on oppositesides of BC such that ar (ABC) = ar (DBC). Show that BC bisects AD.

ORShow that the diagonals of a parallelogram divide it into four triangles of equal area.

29. In the figure, ABCD is a cyclic quadrilateral whosediagonals intersect at a point E. If ∠DBC = 70°,∠BAC = 30°, find ∠BCD.Further, if AB = BC, find ∠ECD.

30. ABCD is a rhombus. Show that diagonal AC bisects ∠A as well as ∠C and diagonalBD bisects ∠B as well as ∠D.

31. Make a frequency polygon for given frequency table.


0 5 2

5 10 3

10 15 4

15 20 1

20 2

−−−−− 555 5

25 30 3−

32. Monica has a piece of canvas whose area is 551 m2. She uses it to have a conical tentmade, with base radius of 7 m. Assuming that all the stitching margins and the wastageincurred while cutting, amounts to approximately 1 m2, find the volume of the tent thatcan be made with it.

33. The side AB of a parallelogram ABCD is produced to any point P. A line through A andparallel to CP meets CB produced at Q and then parallelogram PBQR is completed.Show that ar(ABCD) = ar(PBQR).

34. 4 years before, age of a mother was 3 times the age of her daughter. Write a linearequation to represent this situation and draw its graph.

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SECTION A


1. A diagonal of a rectangle is inclined to one side of the rectangle at 25°. The acute anglebetween the diagonals is :(a) 55° (b) 40° (c) 25° (d) 50°

2. The median of a triangle divides it into two :(a) triangles of equal area (b) congruent triangles(c) right triangles (d) isosceles triangles

3. In the figure, if AOB is a diameter of the circle andAC = BC, then ∠CAB is equal to :(a) 30° (b) 60°(c) 90° (d) 45°

4. The radius of a sphere is 2r, then its volume will be :

(a)43

3πr (b) 4πr3 (c)323

3πr (d)83

3πr

5. The mean of five numbers is 30. If one number is excluded, their mean becomes 28.The excluded number is :(a) 38 (b) 30 (c) 35 (d) 28

6. Which of the following is not true for a parallelogram?(a) opposite sides are equal (b) opposite angles are equal(c) opposite angles are bisected by the diagonals(d) diagonals bisect each other

7. In a cylinder, radius is doubled and height is halved. The curved surface area will be :(a) halved (b) doubled (c) same (d) four times

8. A bag contains x white, y red and z blue balls. A ball is drawn at the random, then theprobability of drawing a blue ball is :

22

(a)z

x y z+ + (b)y

x y z+ + (c)x

x y z+ + (d) 0

SECTION B


9. In the figure, if AOB is a diameter and ∠ADC = 120°,find ∠CAB.

OR

Prove that the cyclic parallelogram is a rectangle.

10. In the figure, ABCD is a parallelogram. Find the value ofx and y.

11. In the figure, P and Q are mid-points of sides ABand AC respectively of ΔABC. If PQ = 2.5 cm andAB = AC = 7 cm, then find the perimeter of ΔABC.

12. Marks obtained by 50 students in a class test of 100 marks are given below :

Marks 0-25 25-50 50-75 75-100

No. of students 4 12 18 16

Find the probability that a student obtains less than 50% marks.13. Check whether the graph of the linear equation x + 2y = 7 passes through the point

(0, 7).14. A cone, a hemisphere and a cylinder stand on equal bases and have same height. Find

the ratio of their volumes.

23

SECTION C


15. Draw the graphs of the equations x + y = 6 and 2x + 3y = 16 on the same graph paper.Find the coordinates of the points where the two lines intersect.

16. Find three solutions of 5x – y + 6 = 0 after reducing it to y = mx + c form.

17. Bulbs are packed in cartons, each containing 40 bulbs. Seven hundered cartons wereexamined for defective bulbs and the results are given in the following table :

No. of defective bulbs 0 1 2 3 4 5 6 more than 6

Frequency 400 180 48 41 18 8 3 2

One carton was selected at random, what is the probability that it has :

(i) no defective bulbs ? (ii) defective bulbs from 2 to 6 ? (iii) defective bulbs less than 4 ?18. If the mean of five observations x, x + 2, x + 4, x + 6, x + 8 is 11. Find the mean of

first three observations.OR

The observations 10, 13, 15, x + 1, x + 5, 30, 32, 36 are in ascending order withmedian 20. Find the value of x.

19. ABC is a triangle right angled at C. A line through the mid-point M of hypotenuse ABand parallel to BC intersects AC at D. Show that

(i) D is the mid-point of AC.

(ii) MD ⊥ AC

20. A solid cube of side 12 cm is cut into eight cubes of equal volume. What will be theside of the new cube? Also find the ratio between their surface areas.

21. A heap of wheat is in the form of a cone. Diameter of the base of the heap is 8 m andheight is 3 m. Find its volume. The heap is to be covered to protect it from rain, findthe area of canvas required.

OR

Two solid spheres made of the same metal have weights 5920 g and 740 g respectively.Determine the radius of the larger sphere, if the diameter of the smaller one is 5 cm.

22. Construct a triangle ABC such that AB = BC = 6 cm and median AD = 4 cm.23. D and E are points on sides AB and AC respectively of ΔABC such that

ar (DBC) = ar (EBC). Prove that DE || BC.

24

24. Show that the line segments joining the mid-points of opposite sides of a quadrilateralbisect each other.

ORProve that the diagonal of a parallelogram divides it into two congruent triangles.

SECTION D


25. The taxi fare in a city is as follows :For the first kilometre, the fare is Rs 8 and for the subsequent distance it isRs 6 per km. Taking the distance covered as x km and total fare as Rs y, write a linearequation for this information and draw its graph.

26. A dome of a building is in the form of a hemisphere. From inside, it was whitewashedat the cost of Rs 498.96. If the cost of whitewashing is Rs 2.00 per square metre, find(i) the inside surface area of the dome. (ii) volume of air inside the dome.

ORA storage tank consists of a circular cylinder with a hemisphere adjoined on either end.If the external diameter of the cylinder be 1.4 m and its length be 5 m, what will bethe cost of painting it on the outside at the rate of Rs 10 per square metre?

27. AB and CD are two chords of a circle of radius r such that AB = 2AC. If p and q arethe distances of AB and AC from the centre, prove that 4q2 = p2 + 3r2.

OR

If a line drawn parallel to the base of an isosceles triangle to intersect its equal sides,prove that the quadrilateral so formed is cyclic.

28. In the figure, BD || CA, E is the mid-point of CA and

BD = 12 CA. Prove that ar (ABC) = ar (DBC).

29. In the figure, PQRS is a parallelogram in which PQ isproduced to T such that QT = PQ. Prove that ST bisectsRQ.

30. Draw a histogram and frequency polygon on the same graph for the data given below :

Marks 60-90 90-120 120-150 150-180 180-210 210-240 240-270

No. of students 12 7 10 3 15 4 2

31. Draw the graph of the equation 2x + 3y – 6 = 0.

(i) Using graph paper determine whether x = 3 and y = 0 is a solution.

(ii) Find the value of y, if x = –3 and

(iii) Find the value of x, if y = –2 from the graph and verify.

32. In the figure, ABCD and AEFD are two parallelograms.Prove that ar(PEA) = ar(QFD).

33. A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in theinterior. The diameter of the pencil is 7 mm and diameter of the graphite is 1 mm. If thelength of the pencil is 14 cm, find the volume of the wood and that of the graphite.

34. The heights of 50 students, measured to the nearest centimetres, have been found to be asfollows :

135, 162, 173, 151, 176, 165, 162, 145, 171, 172, 157, 161, 172, 158, 163, 175, 148, 173,163, 159, 160, 162, 172, 175, 176, 168, 167, 170, 172, 173, 165, 151, 149, 169, 173, 138,156, 148, 159, 166, 176, 151, 139, 146, 164, 173, 141, 142, 150, 159.

Represent the data given above by a grouped frequency distribution table, taking classintervals as 160 – 165, 165 – 170 etc.

1

SCIENCE-IX (Term-II)MODEL TEST PAPER – 1 (UNSOLVED)

Maximum Marks : 90 Maximum Time : 3 hours

Instructions : Same as in Sample Question Paper.

SECTION A

1. In the figure given below, if the bob of the pendulum swings from P to Q, what is thekinetic energy at Q? [1]

Support

P

Q

2. What is ammonification? [1]3. Name one control measure for overcoming the problem of ozone depletion. [1]4. Draw a sketch of Bohr’s model of an atom with three shells. [2]5. Name the group of plants with the following characters : [2]

(a) Plants with seeds(b) Plants without roots, stem, leaves or flowers(c) Plants having seeds with two cotyledons(d) Plants visible with naked eye but having no chlorophyll.

6. Name and define the force experienced by a body when immersed in a fluid. What isthe direction of this force? [2]

7. Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remainalmost the same in the atmosphere? [2]

8. What is the qualitative meaning of the symbol of chlorine (Cl) of atomic mass 35.5 u?[3]

9. (a) Mention the postulate of Dalton's Atomic Theory that explain the Law of ConstantProportion. [3]

(b) Mention any two rules to write a chemical formula.(c) Write the chemical formulae of the following compounds :(i) Calcium hydroxide (ii) Ammonium sulphate

2

10. In the following table the mass number and the atomic number of certain elements aregiven. [3]

Elements A B C D EMass No. 1 7 14 40 40At. No. 1 3 7 18 20

(a) Select a pair of isobars from the above table.(b) What would be the valency of element C listed in the above table?(c) Which two subatomic particles are equal in number in a neutral atom?

11. Which do you think is a more basic characteristic for classifying organisms—the placewhere they live or the kind of cells they are made of ? Why? [3]

12. (i) What do you mean by disease symptoms? [3](ii) Suggest two lines of treatment given to patients suffering from infectious diseases.

13. What precautions will you take to justify “prevention is better than cure"? [3]14. (a) Name any two air-borne diseases. How does the disease causing microbes spread

through air? [3](b) How does the immune system of our body function?

15. What happens when :(a) Buoyant Force exerted by the fluid is less than the weight of the body? [3](b) Buoyant Force exerted by the fluid is equal to the weight of the body?

16. (a) The potential energy of a freely falling object decreases progressively. Whathappens to its (i) kinetic energy (ii) total mechanical energy? State the law onwhich your answer is based. [3]

(b) A household consumes 1 kWh of energy per day.How much energy is this in joule?

17. 50 sound waves pass through a point in 0.1 s. If the distance between one compressionand the subsequent rarefaction is 0.34 m, calculate (a) frequency (b) wavelength(c) wave velocity of the longitudinal wave in air. [3]

18. Represent graphically by two separate diagrams in each case. [3](i) Two sound waves having the same amplitude but different frequencies.

(ii) Two sound waves having the same frequency but different amplitudes.(iii) Two sound waves having different amplitudes and also different wavelengths.

19. Explain with the help of a labelled diagram carbon cycle in nature. [3]20. Give reasons for the following : [5]

(a) 1840 Ar and 20

40 Ca are called isobars. (b) 'He' and 'Ne' have zero valency.(c) An atom is neutral. (d) Nucleus is positively charged.(e) Isotopes have similar chemical properties.

OR(a) What are isobars? Give one example. (b) Write any two uses of isotopes. [5](c) Write two differences between isobars and isotopes.

3

21. (a) Draw a well labelled diagram of Euglena.(b) Name the kingdom to which it belongs. [5]

ORPick the odd one out and justify your choice by giving reasons.(a) Moss, Fern, Pinus, Spirogyra. [5](b) Sea cucumber, Octopus, Feather star, Star fish.

22. (a) Derive the formula of kinetic energy of an object of mass ‘m’ moving with auniform velocity ‘v’. [5]

(b) A force acting on a 20 kg mass changes its velocity from 5 ms–1 to 3ms–1. Calculatethe work done by the force.

OR(a) Define power.(b) State and define the S.I. unit of power.(c) A force applied on a body of mass 4 kg for 5 seconds changes its velocity from

10 ms–1 to 20 ms–1. Find the power required.23. (i) How the bats make use of ultrasonic waves to catch their prey? Explain. [5]

(ii) A radar signal is reflected by an aeroplane and is received 2 × 10–5 s after it wassent. If the speed of these waves is 3 × 108 ms–1, how far is the aeroplane?

OR(i) What causes reverberation of thunder sound?(ii) A SONAR device on a submarine sends a signal and receives an echo 5 s later.

Calculate the speed of sound in water if the distance of the object from thesubmarine is 3625 m.

24. (a) How can we prevent the loss of top soil? Discuss. [5](b) Why are root nodules useful for plants?

OR(a) What is biogeochemical cycle?

Describe the oxygen-cycle with the help of a labelled diagram.

SECTION B25. Which of the following information is not conveyed by a chemical equation? [1]

(a) The reactants taking part in the reaction(b) The products formed in the reaction(c) The speed of the reaction(d) The ratio of the weights of reactants and products taking part in the reaction

26. Observe the following pictures. The common feature that assigns them to the samephylum is : [1]

(a) wings (b) three pairs of legs(c) jointed appendages (d) antennae

4

27. Which one of the following characteristics can be used to distinguish gymnospermsfrom angiosperms? [1]

(a) Presence of pollen chamber in gymnosperms(b) Presence of naked ovules in gymnosperms(c) Presence of stomata in angiosperms(d) Absence of naked ovules in gymnosperms

28. Parallel venation is the characteristic feature of [1](a) monocots (b) dicots (c) both (a) and (b) (d) none of these

29. In Pinus, the fertilisation takes place in the : [1](a) 1st year cone (b) 2nd year cone(c) 3rd year cone (d) microsporangia

30. Scales are present in : [1](a) fish (b) reptiles (c) both (a) and (b) (d) none of these

31. A female Anopheles lays the eggs about : [1](a) one at a time (b) 5 at a time(c) 50 to 200 at a time (d) None of the above

32. The readings of the spring balance will be : [1](a) equal to each other in all cases A, B and C(b) equal to each other in cases B and C only(c) equal to each other in cases A and C only(d) different in every case.

33. The density of which of the following cannot be measured accurately using a springbalance and a measuring cylinder? [1](a) A ball filled with a liquid having a leakage (b) A block of ice at 0°C(c) A small porous solid (d) All of these

34. The principle of a spring balance is : [1](a) the extension produced in spring is directly proportional to the square of the

stretching force(b) the extension produced in spring is directly proportional to the stretching force(c) the extension produced in spring is inversely proportional to the stretching force(d) the extension produced in spring is inversely proportional to the square of the stretch-

ing force.

35. If the reflecting body is covered with a loose woollen cloth, the reflected sound : [1](a) heard will be more louder (b) heard will be less louder(c) heard will be of the same loudness (d) will not be heard.

36. The figure given below shows a line diagram [1]for the verification of laws of reflection of asound wave. The vibrating tuning fork shouldbe held at :(a) A (b) B (c) D (d) C

37. It is easier to lift a heavy stone in water because : [1](a) the stone loses its mass in water (b) the stone loses its weight in water(c) the stone experiences an upthrust equal to the volume of water displaced(d) the stone experiences an upthrust equal to the weight of water displaced.

38. During the formation of a pulse, most of the medium at any time is : [1](a) in the state of rest (b) in the state of motion(c) some parts in the state of rest and some parts in the state of motion(d) none of the above.

39. A pulse travels through a slinky 10 m long from one end to the other end and thenback to the point of origin in 3 s. The velocity of the pulse in the slinky is : [1](a) 3.33 ms–1 (b) 4.5 ms–1 (c) 6.00 ms–1 (d) 6.66 ms–1.

40. In which case is the pressure exerted by the brick on the ground maximum? [1](a) A(b) B(c) C(d) none of these

41. During sharpening of a knife we : [1](a) decrease the surface area of the cutting edge(b) increase the surface area of the cutting edge(c) remove rust from the cutting edge (d) none of the above

42. The tuning fork in the experiment to prove laws of reflection of sound has to beplaced with its prongs. [1](a) Vertical near the tube (b) Horizontal near the tube(c) Vertically or horizontally near the tube makes on difference(d) Inclined near the tube.

ANSWERS16. 3.6 × 106 J 17. 500 Hz, 0.68 m, 340 m/s 22. (b) 210 J OR (c) 40 W23. (ii) 3 km OR ((ii) 1450 m/s 25. (c) 26. (c) 27. (b) 28. (a) 29. (b)30. (c) 31. (c) 32. (b) 33. (d) 34. (b) 35. (d) 36. (a) 37. (d)38. (a) 39. (d) 40. (a) 41. (a) 42. (b)

A BC

6

SECTION A

1. How will the kinetic energy of an object change, if its velocity is halved? [1]2. What are the two forms of oxygen found in the atmosphere? [1]

3. What is biological fixation? [1]

4. Draw a sketch of Bohr’s model of an atom with four shells. [2]

5. Give two characteristics of the class Amphibia. [2]

6. Define density. What is its unit in SI system? [2]

7. How do the rivers from land, add minerals to sea water? [2] 8. Calculate : [3]

(i) The percentage of hydrogen in ammonium sulphate [(NH4)2 SO4].

(ii) The percentage composition of water present in washing soda [Na2CO3. 10H2O].

(iii) The mass of oxygen contained in 72 g of pure water.[N = 14 u, H = 1 u, S = 32 u, O = 16 u, Na = 23 u, C = 12 u]

9. What is Avogadro number? How many atoms of each element are present in 6.3 g ofnitric acid (HNO3)? [3][H = 1.0, N = 14.0, O = 16, NA = 6.022 × 1023 mol–1]

10. An element X has a mass number 27 and it contains 13 protons. [3]

(i) Write the symbolic representation of the element.(ii) Find the number of neutrons and electrons in the element.

(iii) Write the electronic configuration of the element.

11. Give three criteria for classification of organisms belonging to the kingdom Monera.[3]

12. Give two symptoms of each of the following diseases : [3]

(a) Malaria (b) Typhoid (c) Marasmus.

13. Define health. List four factors affecting health. [3]

14. A doctor/nurse/health-worker is exposed to more sick people than others in the com-munity. Find out how she/he avoids getting sick herself/himself. [3]




7

15. You have a bag of cotton and an iron bar, each indicating a mass of a 100 kg whenmeasured on a weighing machine. In reality, one is heavier than the other. Can yousay which one is heavier and why? [3]

16. Calculate the work required to be done to stop a car of 1500 kg moving at a velocityof 60 km/h? [3]

17. Define : (i) wavelength (ii) frequency (iii) amplitude of a sound wave. [3]

18. (a) What is meant by 'compression' and 'rarefaction' of longitudinal wave? [3]

(b) Give well labelled graphical representation of a longitudinal wave.

19. (a) With the help of well labelled diagram explain water cycle in nature. [3]

(b) How is greenhouse effect related to Global warming? Explain.20. (i) On the basis of Thomson’s model of an atom, explain how the atom is neutral

as a whole. [5](ii) For the symbol H, D and T, tabulate three subatomic particles found in each of

them.OR

Explain with examples (i) atomic number (ii) mass number (iii) isotopes and (iv) iso-bars. Give any two uses of isotopes.

21. (a) List any two main characteristics of chordates. [5]

(b) In which class would you place any organism which has –

(i) four chambered heart and lay eggs.

(ii) skeleton made up of both bones and cartilage and are cold blooded.OR

Differentiate between annelida and nematoda.

22. (i) About how many kg of boiled potatoes would you have to eat to supply energy forhalf hour of swimming. Assume that your body utilises only 20% of the energy storedin potatoes. Energy content of potatoes is 3.7 × 106 J/kg and the energy used in swim-ming is 25.6 kJ/minute. (ii) A rocket of 3 × 106 kg mass takes off from a launching padand acquires a vertical velocity of 1 kms–1 at an altitude of 25 km. Calculate(a) Potential energy (b) Kinetic energy. [Take the value of g = 10 ms–2] [5]

OR(i) Distinguish between work, energy and power. State the SI units for each of these

quantities.(ii) A dog of mass 16 kg is running at a constant speed of 12 ms–1. Calculate the kinetic

energy of the dog.23. (a) Why the stage of an auditorium has curved background, curtains, carpets and

false ceiling? [5]

8

(b) The sound of a ringing bell inside a vacuum chamber cannot be heard. Why?OR

State the relationship between frequency and time period of a wave. The wavelengthof vibrations produced on the surface of water is 2 cm. If the wave velocity is16 m/s find the frequency and time period.

24. What is the role of the following in soil formation? [5](i) Water (ii) Lichens (iii) Sun

OR(i) All living organisms are basically made up of C, N, S, P, H and O. How do they

enter the living forms? Discuss.(ii) Lichens commonly grow in Manali or Darjeeling but not in Delhi. Explain.

SECTION B

25. Sudden and non-repetitive single disturbance in the medium is : [1](a) Propagation (b) Wave (c) Pulse (d) Jerk

26. Skiers use long and wide skies while gliding on the snow, because : [1](a) it exerts maximum pressure on the ground.(b) it exerts least pressure on the ground.(c) it cuts a lot of snow(d) it provides more stability.

27. The S.I. unit of thrust is : [1](a) kgf (b) gf (c) Pa (d) N

28. The weight of a body felt in tap water and salty water are WA and WB respectively, then :[1]

(a) WA = WB (b) WA > WB (c) WA < WB (d) WA = 2WB

29. Three students used three different containers A, B and C of different shapes, for findingthe loss in weight of a solid when dipped in water. On dipping a solid sphere in thesecontainers they would observe that the loss in weight is : [1]

(a) maximum in (A) (b) minimum in (A)(c) maximum in (B) (d) same in all

9

30. Four measuring cylinders with different least counts are shown in figures A, B, C and D.The most suitable cylinder for determining the volume of a cube of side 1 cm is :

[1](a) A (b) B (c) C (d) D

31. The figure given below represents a graph between the angle of incidence and theangle of reflection for a sound wave. From the graph we can say : [1]

(a) Angle of incidence decreases with the increase in angle of reflection(b) Angle of incidence increases with the decrease in angle of reflection(c) Angle of incidence is always equal to the angle of reflection(d) Angle of incidence sometimes increases and sometimes decreases, depending

upon the loudness of sound.32. In the experiment of verification of reflection of sound, the incident sound is directed

along : [1](a) the axis of the tube(b) the normal to the axis of the tube(c) at an angle of 30° from the axis of the tube(d) at an angle of 45° from the axis of the tube

33. For producing a transverse wave along a string /slinky, a student should : [1](a) compress the free end of string /slinky.(b) jerk the free end of string/slinky at right angle to its length.

10

(c) pull the free end of string /slinky.(d) do all the above.

34. A student sets up a slinky on a smooth table top in the manner shown here. He canproduce a pulse in the slinky by giving a jerk to its free end : [1](a) at an angle 45° with the table top(b) backward and forward along the length

of the slinky(c) downwards(d) towards left

35. The correct way of reading the liquid level is shown in : [1](a) figure a (b) figure b (c) figure c (d) figure d

36. A student found the posterior part of a male cockroach in his house. After drawing thefollowing sketch he compares it with the sketch given in the book and found that apart is missing. The missing part as per the sketch is : [1](a) brood pouch(b) antenna(c) anal cerci(d) anal style

37. Figures of two plants are given. Observe them carefully and select the option which cor-rectly gives their identification and names of the groups to which they belong : [1](a) (i) moss : bryophyta

(ii) fern : pteridophyta(b) (i) pine : gymnosperm

(ii) leafy plant : angiosperm(c) both (i) and (ii) are mosses and belong to

bryophyta(d) both (i) and (ii) are ferns and belong to

pteridophyta

Smooth Table

38. The structure associated with earthworm, cockroach, bony fish and birds are givenbelow in a series. Choose the correct series : [1]

(a) Pneumatic bones, gills, Chitinous plates, metameres(b) Gills, metameres, chitinous plates, pneumatic bones(c) Metameres, gills, chitinous plates, pneumatic bones(d) Metameres, chitinous plates, gills, pneumatic bones

39. Mosquitoes use their siphon tube for : [1](a) sucking the blood (b) drinking water (c) swimming (d) breathing

40. A plant showing reticulate venation and a woody stem is a : [1](a) Pteridophyta (b) Gymnosperm (c) Monocot (d) Dicot

41. Jointed appendages are characteristic of : [1](a) Amphibia (b) Reptilia (c) Arthropoda (d) Mammalia

42. Elements X and Y react to form Xa Yb. Elements P and Q react to form PmQn. Theformula of the compound formed between X and Q is. [1]

(a) XbQm (b) XmQb (c) XaQn (d) XnQa

ANSWERS8. (i) 6.06% (ii) 62.93% (iii) 64 g.9. 6.022 × 1022 atoms of H, 6.022 × 1022 atoms of N, 1.8066 × 1022 atoms of O

16. 208416.685 J22. (i) 5.185 kg (ii) (a) 7.5 × 1011 J (b) 1.5 × 1012 J OR (ii) 1152 J23. OR 800 Hz; 0.00125 s 25. (c) 26. (b) 27. (b) 28. (b) 29. (d)30. (a) 31. (b) 32. (a) 33. (c) 34. (b) 35. (a) 36. (d) 37. (a)38. (d) 39. (d) 40. (d) 41. (c) 42. (b)

12

SECTION A

1. Calculate the work done by a machine of 50 W power rating in 30 s. [1]2. What is greenhouse effect? [1]3. Name one process which increases the percentage of carbon dioxide in the

atmosphere. [1]4. With the help of the given table, find the mass number of oxygen and sulphur atom.[2]

Element Symbol No. of Protons No. of Neutrons No. of ElectronsOxygen O 8 8 8Sulphur S 16 16 16

5. Name the phylum to which each of the following animals belong : Sea horse, silverfish, cuttle fish, jelly fish. [2]

6. Give one example each where the same force acting on (i) a smaller area exerts a largerpressure (ii) a larger area exerts a smaller pressure. [2]

7. How are clouds formed? [2]8. (a) What mass of silver nitrate will react with 5.85 g of sodium chloride to produce

14.35 g of silver chloride and 8.5 g of sodium nitrate? [3](b) On what law is the above reaction based and state the law.

9. Calculate : [3](a) number of molecules in 90 g of H2O(b) number of mole in 19 g of H2O2

(c) formula unit mass of Al2(CO3)3

(Atomic mass : Al = 27 u, C = 12 u, O = 16 u, H = 1 u, NA = 6.022 × 1023 mol–1)10. Define [3]

(a) Atomicity (b) Valency (c) Molecule11. (i) What are the divisions of living organisms? [3]

(ii) How is classification and evolution interrelated with each other?12. (i) What is a disease? [3]

(ii) Which bacterium causes peptic ulcer?(iii) Who discovered the above pathogen for the first time?




13

13. What are chronic diseases and acute diseases? Which one causes more damage to ourbody and how? [3]

14. (a) What are anitibiotics [3](b) How do they work?(c) How is penicillin effective in controlling bacterial diseases?

15. Give reasons : [3](a) It is easier to lift a heavy stone under water.(b) A block of plastic released under water come up to the surface of water.

16. (a) The potential energy of a freely falling object decreases progressively. Whathappens to its (i) kinetic energy (ii) total mechanical energy? State the law onwhich your answer is based. [3]

(b) A household consumes 1 kWh of energy per day.How much energy is this in joule?

17. (i) How does a sonar detect the depth of submerged objects? [3](ii) Which property determines the pitch of sound?

18. (i) If velocity of sound in air is 340 ms–1, calculate : [3](a) wavelength when frequency is 256 Hz.(b) frequency when wavelength is 0.85 m.

(ii) Draw a curve showing density or pressure variations with respect to distance fora disturbance produced by sound. Mark the position of compression and rarefac-tion on this curve.

19. (a) What are the forms of oxygen found in the atmosphere? [3](b) “Forests influence the quality of our air, soil and water resources”. Justify the

statement.20. Compare Thomson’s, Rutherford’s and Bohr’s Model of an Atom. [5]

OR(i) The ratio of the radii of hydrogen atom and its nucleus is 105. Assuming the

atom and the nucleus to be spherical what will be the ratio of their sizes?(ii) If an atom is represented by the planet earth (‘Re’ = 6.4 × 106 m) estimate the size of

the nucleus.(iii) How many neutrons are present in each of the three isotopes of hydrogen?

21. Name the phylum to which this organism belongs. Write any two characteristicfeatures of the phylum. [5]

14

ORDifferentiate between the following, giving one main point of difference. [5]

(a) Gymnosperm and Angiosperm(b) Diploblastic and Triploblastic animals(c) Dicotyledons and Monocotyledons

22. (a) Derive the formula of kinetic energy of an object of mass 'm' moving with auniform velocity 'v'. [5]

(b) A force acting on a 20 kg mass changes its velocity from 5 ms–1 to 2 ms–1. Calculatethe work done by the force.

OR(i) Two bodies A and B of masses 4 kg and 16 kg respectively have the same kinetic

energy. Calculate the ratio of their velocities.

(ii) A mass of 10 kg is dropped from a height of 50 cm. Find : (a) kinetic energy, and(b) velocity, just as it reaches the ground. Does the velocity depend on the massof the particle? Explain.

23. Distinguish between the following :(a) Mechanical waves and electromagnetic waves(b) Loudness and intensity(c) Crest and compression

OR(a) What is audible range of the average human ear?(b) Explain how ultrasound is used to clean spiral tubes and electronic components?

24. (i) What is the greenhouse effect? [5]

(ii) Explain the carbon-cycle with the help of a labelled diagram.

OR

How are living organisms dependent on the soil? Are organisms that live in watertotally independent of soil as a resource? [5]

SECTION B

25. The amount of reflection, a sound wave undergoes depends upon(a) Speed of sound (b) Density of the medium(c) Both (a) and (b) (d) None of these

26. The force acting on a body perpendicular to its surface is called : [1](a) frictional force (b) thrust(c) pressure (d) all of these

15

27. A cuboid has dimensions 30 cm × 20 cm × 5 cm. If it exerts maximum pressure, whatshould be its surface area of contact? [1]

(a) 600 cm2 (b) 150 cm2 (c) 100 cm2 (d) none of these28. Students are interested to observe gills of a mushroom, which part they should be

shown by the label. [1]

(a) (iv) (b) (iii) (c) (i) (d) (ii)29. While locating the stem of a fern, the students find that it is : [1]

(a) underground rhizome (b) coiled like spring(c) totally absent (d) branched and filamentous

30. You can observe only one cotyledon in the embryo of : [1](a) maize (b) gram (c) soyabean (d) bean

31. Seeta was doubtful whether the cactus present in her garden was a xerophyte or not.Which of the following characters will confirm that the cactus is a xerophyte? [1]

(a) Succulent leaves and deep root system (b) Fleshy stem and spiny leaves(c) Green stem and branched root system (d) Woody stem and spiny leaves.

32. Which of the following is not an aerial adaptation? [1](a) presence of feathers (b) forelimbs modified into wings(c) presence of gills (d) hollow bones

33. Which of the given mosquito lay its eggs on damp soil ? [1](a) Anopheles (b) Culex (c) Aedes (d) None

34. In the experiment to establish the relation between loss in weight of an immersed solidwith the weight of water displaced by it, the upthrust experienced by the object in thetap water and in salty water are Uw and Us respectively. [1]then :

(a) Uw = Us (b) Uw > Us (c) Us = 2Uw (d) Uw < Us

35. Four students a, b, c and d while performing an experiment on establishing the relationbetween the loss of weight of a small solid when fully immersed in tap water, and the

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weight of water displaced by it, used four different shapes of overflow cans containingwater as shown : [1]

The arrangement, that would give correct results is that of student :

(a) a (b) b (c) c (d) d36. While determining the density of the material of a sphere, using a spring balance and

measuring cylinder, a student noted the following readings : [1](i) mass of the sphere = 81 g

(ii) reading of water level in the cylinder without sphere in it = 54 ml

(iii) reading of water level in the cylinder with sphere in it = 63 mlOn the basis of these observations, the density of the material of the sphere is :

(a) 1500 kg/m3 (b) 6000 kg/m3 (c) 7000 kg/m3 (d) 9000 kg/m3 .

37. While calculating the density of a stone with the help of a spring balance and measur-ing cylinder, few air bubbles were seen sticking to the stone when immersed in water.The presence of air bubbles will lead to the : [1]

(a) increase in density (b) decrease in density(c) no change in density (d) none of these.

38. Which of the following arrangements is best suited for verifying the laws of reflectionof sound? [1]

(a) 1 (b) 2 (c) 3 (d) 439. Metallic tubes are employed in the verification of laws of reflection of sound waves.

These tubes are highly polished because they make the sound waves : [1](a) move in straight lines (b) concentrate into powerful beam

(c) have multiple reflections and prevent spreading of sound(d) none of the above

40. In the experiment of finding speed of a pulse propagated through a slinky, the pulseis produced : [1](a) by pulling the slinky towards us.(b) by pushing the slinky so as to compress it.(c) by giving a jerk to the slinky in a vertically upward direction.(d) by giving a jerk to the slinky in a direction perpendicular to its length.

41. A pulse was created in a slinky/string of length 4 m by a group of students. Theyobserved that it returned, after reflection, at the point of creation 6 times in 10 secondsand calculated the speed as follows : [1]

Students A B C DSpeed m/s 0.4 2.4 4.8 9.6

The correct speed was calculated by the student :(a) A (b) B (c) C (d) D

42. Atomic number of an element X is 9. Which of the following represents the correctequation for the ion formation of an atom of X? [1](a) X – e– → X– (b) X + e– → X– (c) X – e– → X+ (d) X + e– → X+

ANSWERS1. 1500 J 4. 16 u, 32 u. 18. (a) 1.33 m (b) 400 Hz

20. OR (i) 1015 : 1 (ii) 64 m 22. (b) 210 J OR (i) 2 : 1 (ii) (a) 50 J(b) 3.16 m/s 25. (c) 26. (b) 27. (c) 28. (d) 29. (a) 30. (a)31. (b) 32. (c) 33. (c) 34. (d) 35. (c) 36. (d) 37. (b) 38. (b)39. (c) 40. (a) 41. (b) 42. (b)

18

SECTION A

1. Write an expression for the work done, when a force is acting on an object in thedirection of its displacement. [1]

2. Name four pollutants released due to burning of fossil fuels. [1]

3. Why do plants not utilise nitrogen directly from the atmosphere? [1]

4. Give one use of the isotope of (i) cobalt (ii) iodine. [2]

5. How are pteridophytes different from phanerogams? [2]

6. Why is it difficult to hold a school bag having a strap made of thin and strong string? [2]

7. Give four ways in which you can reduce water pollution. [2]

8. (i) Define one mole of an element. [3]

(ii) What is the relation between mole and gram atomic mass of an element.

(iii) Gram atomic mass of an element X is 27 g. How many moles of X are in 54 g?

9. Calculate the number of particles in each of the following : [3]

(a) 46 g of Na atoms. (b) 8 g of O2 molecules.

(c) 0.1 mole of carbon atoms10. (a) Illustrate Rutherford’s experiment to explain the model of an atom. [3]

(b) If an ion M3+ contains 10 electrons and 14 neutrons. What are the atomic numberand mass number of the element M?

11. How do gymnosperms and angiosperms differ from each other? [3]

12. (i) Why is the immune system essential for health? [3](ii) Why are antibiotics not effective for viral diseases?

(iii) Give two examples of non-infectious diseases.13. What are the various means by which infectious diseases spread? Explain giving

examples. [3]14. Give reasons : [3]

(i) Social harmony and good economic conditions are necessary for good health.




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(ii) Our surroundings should be free of stagnant water.(iii) Balanced diet is neccessary for maintaining a healthy body.

15. (a) Explain why wide sleepers are placed below railway lines? [3](b) When we jump into a swimming pool we feel lighter. Why?

16. (a) Define work and write its SI unit. [3](b) State three conditions for which mechanical work is zero.

17. How does the sound produced by a vibrating object in a medium reach your ear? [3]

18. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengthsof sound waves in air corresponding to these frequencies? Take the speed of sound inair as 344 ms–1. [3]

19. (a) Draw Carbon-cycle (any six labellings). [3](b) State two effects of depletion of ozone layer.

20. (a) What is an octet? How do elements reach an octet? [5](b) Make a schematic atomic structure of magnesium or phosphorus.

(given : number of protons of magnesium = 12, phosphorus = 15)

(c) Bromine atom is available in the form of two isotopes 35

79

35

81Br and Br in 49.7% and50.3% respectively. Calculate the average atomic mass of bromine.

OR(a) What are canal rays?(b) If an atom contains one electron and one proton, will it carry any charge? Identify

the element.(c) 'X' and 'Y' are isobars. 'X' has mass number 14 and atomic number 6.

'Y' has 7 neutrons. Predict the atomic number and mass numbers of 'Y'21. You are given leech, Nereis, Scolopendra, prawn and scorpion; and all have seg-

mented body organisation. Will you classifiy them in one group? If no, give theimportant characters based on which you will separate these organisms into differentgroups. [5]

ORWhich organism is more complex and evolved among bacteria, mushroom and mangotree? Give reasons.

22. (i) A body has a mass m and velocity v. If the mass is increased four times and velocityis decreased two times, calculate the ratio of the kinetic energies in the abovecases. [5]

(ii) Why does a truck moving at 18 kmh–1 cause far more serious accident than a cyclemoving at the same speed?

(iii) What kind of energy transformation takes place when a sparkle is lighted?

20

ORState in each of the following cases, if work is done/not done and why? [5](a) A girl climbing a staircase.(b) A man standing and holding a briefcase in hand.(c) A porter carrying a heavy load and going down the stairs.(d) A boy preparing for examination.(e) A planet going around the sun.

23. (a) How does the temperature affect the speed of sound? [5](b) What determines the pitch of a sound?(c) Give a graphical representation of low pitched and high pitched sound.(d) What is an echo?(e) What is the range of frequency associated with :

(i) Infrasonic sound (ii) Ultrasonic soundOR

(a) Why we cannot hear an each in a small room?(b) A wave pulse on a string moves a distance of 8 m in 0.05 s.(c) End the velocity of the pulse.(d) What would be the wavelength of the wave on the string if its grewuency is 200

Hz?24. (i) What is soil erosion? [5]

(ii) What are the methods of preventing or reducing soil erosion?OR

How are living organisms dependent on the soil? Are organisms that live in watertotally independent of soil as a resource?

SECTION B

25. Speed of a pulse in a string : [1](a) Remains constant (b) Increases (c) Decreases (d) Maybe (b) or (c)

26. When a pulse produced in a string moves through it and srtrikes a rigid pole, it is re-flected back and the shape of the reflected pulse resembles the shape given is : [1]

(a) (i) (b) (ii) (c) (iii) (d) (iv)27. A pulse is a disturbance in a medium which is : [1]

(a) non-repetitive (b) repetitive (c) changes with time (d) none of these.

21

28. A laboratory had the following apparatus available in it : [1](i) Two thin tubes. (ii) An intense and broad source of sound.

(iii) An intense, pointed source of sound. (iv) A sharp pointed detector of sound.(v) A plane metal sheet as reflector. (vi) A thermocol sheet as reflector.

To verify the laws of reflection of sound successfully a student should choose.(a) (i), (iii), (iv) (v) (b) (i), (iii), (v), (ii)(c) (i), (ii), (iv), (v) (d) (i), (iii), (iv), (vi)

29. A sound wave strikes the surface of a reflecting body at an angle of 30°. The angleof incidence for the sound wave is : [1](a) 30° (b) 60° (c) 120° (d) none of the above

30. Observe the difference in the diagram and give the relation between the densities dA anddB of the liquids A and B : [1]

(a) dA = dB (b) dA > dB (c) dA < dB(d) Masses immersed should have different volumes.

31. In a spring balance the space between 0 and 25 g marks is divided into 10 equal parts.The least count of the spring balance is : [1](a) 2.5 g wt (b) 25 g wt (c) 0.25 g wt (d) 15 g wt

32. The water level in a measuring cylinder, before and after immersing a metal cube init, is shown in the figure. [1]The volume of the metal cube is :

(a) 24 cm3 (b) 22 cm3 (c) 20 cm3 (d) 18 cm3

33. A given solid is weighed in air using a spring balance. It is then weighed separately byimmersing it fully first in a vessel containing tap water and then in a vessel containingsalt solution. The reading of the spring balance would be : [1](a) least in air (b) least in water(c) least in salt solution (d) equal in all the three cases

34. In which of the following groups would you place a plant which produces spores andembryos but lacks seeds and vascular tissue? [1]

(a) Bryophytes (b) Pteridophytes (c) Gymnosperms (d) Algae35. You can observe tap root system in : [1]

(a) wheat plant (b) maize (c) onion (d) mustard36. Sohan found green coloured slimy scum in the lake water. What could it be? [1]

(a) Agaricus (b) Moss (c) Spirogyra (d) Dryopteris37. Which of the following features help a fish in adopting to its aquatic mode of life? [1]

(a) Streamlined body (b) Body covered by scales(c) Presence of hollow bones (d) Presence of gills

38. Which of the following statements is incorrect? [1]Cockroach has :

(a) a pair of antennae (b) three pairs of legs(c) body covered by exoskeleton(d) body divided into two parts — cephalothorax and abdomen.

39. Pupa stage is a : [1](a) resting and non feeding stage (b) growing stage(c) disease spreading stage (d) None of the above

40. Three cuboids P, Q and R are of weight 500 N, 200 N and 100 N, and their surface areasare 5 m2, 1m2 and 10 m2 respectively. The cuboids which exert same pressure are : [1](a) P and Q (b) Q and R (c) P and R (d) P, Q and R

41. If the area of contact of a given body is increased, pressure exerted by it : [1](a) increases (b) decreases (c) remains same (d) none of these

42. An atom of X combines with 2 atoms of hydrogen. The valency of X is [1](a) 1 (b) 2 (c) 3 (d) 4

ANSWERS8. (iii) 2 moles9. (a) 1.2044 × 1024atoms (b) 1.5055 × 1023 molecules (c) 6.022 × 1022 atoms

18. 1.72 m, 0.0072 m 20. (c) 80.006 u 22. (i) 1 : 1 23. OR (b) (i) 160m/s (ii) 80 cm 25. (a) 26. (b) 27. (a) 28. (a) 29. (b) 30. (a)31. (a) 32. (c) 33. (c) 34. (a) 35. (d) 36. (c) 37. (d) 38. (d)39. (a) 40. (a) 41. (b) 42. (b)

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SECTION A

1. What are the conditions for doing work? [1]2. What is ammonification? [1]3. What is the reason for the low visibility during cold weather? [1]4. Give reasons : [2]

(i) 4018 Ar and 40

20Ca are called isobars.(ii) Nucleus is positively charged.

5. Write the contribution of Haeckel and Whittaker in classification. [2]6. The volume of a 500 g sealed packed is 350 cm3. Will the packet float or sink in

water, if density of water is 1 g cm–3? What will be the mass of water displaced bythis packet? [2]

7. Why do people love to fly kites near the seashore? [2]8. (i) Define mole of an element. [3]

(ii) In photosynthesis, 6 molecules of carbon dioxide combine with an equal number ofwater molecules through a complex series of reactions to give a molecule of glucosehaving a molecular formula, C6H12O6. How many grams of water would be requiredto produce 18 g of glucose? Compute the volume of water so consumed, assumingthe density of water to be 1 g cm–3. [C = 12, H = 1, O = 16]

9. (i) A gold sample contains 90% of gold and the rest copper. How many atoms of goldare present in one gram of this sample of gold? [Au = 197] [3]

(ii) What is the relation between mole and gram atomic mass of an element?10. Give reasons for the following : [3]

(a) Isotopes of an element are chemically similar.(b) An atom is electrically neutral(c) Noble gases show least reactivity

11. How do annelids differ from arthropods? [3]

12. Becoming exposed to or infected with an infectious microbe does not necessary meandeveloping noticeable disease. Explain. [3]

13. Define Health. List four factors affecting health. [3]14. Why is AIDS considered to be a ‘Syndrome’ and not a disease? [3]15. (a) What is relative density? The relative density of a substance is greater than 1,

what does it signify? [3]




24

(b) If relative density of aluminium is 2.7 and density of water is 1000 kg/m3. Whatis the density of aluminium in SI unit?

16. A man weighing 75 kg climbs up to a vertical height of 15 m in 150 s, while a boyweighing 40 kg climbs up to the same height in 120 s. [3](a) Calculate the ratio of their powers.(b) Who has gained more energy and why? (g = 10 m/s2)

17. Define : [3](i) Wavelength (ii) Time period (iii) Amplitude of a sound wave.

18. A stone is dropped from the top of a tower 500 m high into a pond of water at the baseof the tower. When is the splash heard at the top? Given g = 10 ms–2 and speed ofsound is 340 ms–1. [3]

19. (a) Mention the two forms of oxygen found in atmosphere. [3](b) Name the form of oxygen absorbing U.V. rays.

20. (a) Why do the inert gases like neon and argon have zero valency? [5](b) The atomic number of sodium is 11 and oxygen is 8. Predict their valencies.(c) Draw the schematic atomic structure of

12

24 Mg .(d) State the difference between a proton and an electron on the basis of their location.(e) Give one use of an isotope of cobalt and one use of an isotope of iodine.

OR(i) State the three observations made by Rutherford in the α-particle scattering

experiment.(ii) Write the electronic configuration of an element whose mass number is 31 and

atomic number is 15. What is its valency?

21. Differentiate between flying lizard and bird. [5]OR

How can be keep mosquito and prawn in the same group? Explain it.22. State the energy transformations taking place in the following cases : [5]

(a) When brakes are applied to a speeding vehicle.(b) When an arrow is released from a stretched bow.(c) When someone speaks in front of a microphone.(d) When a tuning fork is hit against a rubber pad.(e) When the coil of a motor moves in a magnetic field.

OR(i) What is the amount of work done by an electron revolving in a circular orbit of

radius ‘r’ around a nucleus. Justify your answer by giving an appropriate reason.(ii) Five bulbs each having 100 W power are used for 4 hours, a heater having

1500 W power is used for 2 hours, and an electric iron of power 1000 W is usedfor 5 hours.

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23. (a) Write the relationship between frequency, wavelength and wave velocity. [5](b) The frequency of a tuning fork is 550 Hz. Calculate the wavelength of waves

produced by it. (Velocity of sound in air = 332 m/s)OR

(a) Why do we hear sound produced by the humming bees while the sound of vibra-tions of pendulum is not heard?

(b) Give any two applications of Ultrasound.24. (i) Explain the nitrogen cycle with a labelled diagram. [5]

(ii) What is the greenhouse effect?OR

(i) Explain the role of the following in soil formation :(a) sun (b) lichens.

(ii) What is crop rotation?

SECTION B

25. A multiple echo is : [1](a) The repeated sound heard after reflection from a rigid obstacle.(b) The repeated sound heard after successive reflection from a number of obstacles.(c) The reflected sound heard after reflection from a particular obstacle.(d) None of the above.

26. A student stretches a slinky to 5 m and then sends a pulse in it. He finds that thevelocity of the pulse is 2 ms–1. The student then stretches the slinky to 7 m and againcalculates the velocity of the pulse. The velocity of the pulse will be : [1](a) less than 2 ms–1 (b) more than 2 ms–1 (c) 2 ms–1 (d) none of these.

27. A flat wire spring used in generating a pulse is called : [1](a) continuous spring (b) rolling spring (c) slinky (d) none of these.

28. For reflection of sound wave, we need : [1](a) A polished mirror. (b) A concave surface painted blue.(c) A large size, opaque reflecting surface. (d) A glass plate.

29.

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In the given experimental setup ticking sound of the clock was heard distinctlythrough pipe P2. When the end 'C' of pipe P2, was lifted a little upwards, keepingthe other end on the table itself, it was found that the sound was no longer heardclearly. [1]

This shows that :

(a) Angle of incidence is less than the angle of reflection.

(b) Angle of incidence is greater than the angle of reflection.

(c) Incident wave, normal and the reflected wave lie in the same plane.

(d) Sound waves obey laws of refraction.

30. While determining the density of the material of a metallic sphere using a spring balanceand a measuring cylinder, a student noted the following observation : [1]

(i) Mass of the sphere = 72 g.

(ii) Initial level of water in the measuring cylinder (without the solid) = 65ml.

(iii) Final level of water in the measuring cylinder (when the object is completely im-mersed in it) = 74 ml.

The student calculated the density of the solid as :

(a) 2000 kgm–3 (b) 9000 kgm–3 (c) 8000 kgm–3 (d) 6000 kgm–3

31. While determining the density of a copper piece using a spring balance and a measuringcylinder, Seema carried out the following procedure : [1]

(a) noted the water level in the measuring cylinder without the copper piece

(b) immersed the copper piece in water

(c) noted the water in the measuring cylinder

(d) removed the copper piece from the water and immediately weighed it using a springbalance

The wrong step in the procedure is :

(a) A (b) B (c) C (d) D.

32. In an experiment when an object is immersed in water, the volume of the displaced watergives: [1]

(a) mass of the object immersed

(b) weight of the object immersed

(c) volume of the object when fully immersed in water

(d) none of the above

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33. You are given a sphere of radius 2cm. If you are asked to select a best suited springbalance to determine its weight, then out of the following which one would you prefer?The sphere is made of an alloy of density 7×103 kg m–3. [1]

(a) Range 0–1000 gwt, least count 5 gwt.(b) Range 0–500 gwt, least count 2.5 gwt.(c) Range 0–250 gwt, least count 2.5 gwt.(d) Range 0–100 gwt, least count 1 gwt.

34. [1]

In the given figure, students label part B. Which is the correct labelling?(a) Rhizoid (b) Cilia (c) Pileus (d) Annulus

35. Aquatic plants usually have a well-developed : [1](a) vascular system (b) stomatal system(c) root system (d) aerenchyma system

36. The Sporangia of a fern develop on : [1](a) roots (b) stems (c) rhizoids (d) leaves

37. Seed leaves are also called : [1](a) embryo (b) seed coat (c) radicle (d) cotyledons

38. Specimens of plants and animals are preserved in : [1](a) ethyl alcohol (b) formalin (c) acetone (d) spirit

39. [1]

Two pictures of animals A and B are shown above. Which characteristic features oftheir bodies are specific features of their respective phyla?

(a) Antennae of A and segments of B(b) Three pairs of legs of A and scales of B(c) Jointed appendages of A and metamerically segmented body of B(d) Wings of A and slender body of B

40. You can observe the eggs laid by a female Anopheles mosquito on the : [1](a) leaf (b) soil surface (c) surface of water(d) wall of house

41. A cuboid of weight 10 kgf has dimensions 2 cm × 5 cm × 10 cm. The maximumpressure exerted by it is :: [1]

(a) 105 Pa (b) 5 × 104 Pa (c) 2 × 104 Pa (d) 104 Pa42. What is the valency of sulphur in SF4 and SF2? [1]

(a) 4 and 2 (b) 1 and 1 (c) 2 and 4 (d) 2 and 2

ANSWERS

6. 1.43 g cm–3, 350 g. 8. (ii) 10.8 g, 10.8 cm3

9. (i) 2.77 × 1021 atoms 15. (b) 2700 kg/m3 16. (a) 3 : 2 18. 11.47 s22. (ii) (a) 10 kWh (b) 36 × 106 J 23. (b) 60 cm 25. (a)26. (b) 27. (c) 28. (c) 29. (c) 30. (c) 31. (d) 32. (c) 33. (c)34. (c) 35. (d) 36. (d) 37. (d) 38. (b) 39. (c) 40. (c) 41. (a)42. (a)

cbse class ix sample papers for summative assessment

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