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PRACTICAL SKILLSIN SCIENCE

TEST BOOKLET

Time allowed : 1½ hours Maximum Marks : 20

GENERAL INSTRUCTIONS :

1. Attempt all questions.

2. There are 30 multiple choice questions in total. Only one of the options in everyquestion is correct.

3. The question paper consists of two sections - Section A and Section B. Each of the20 questions in Section A carries half mark and each of the 10 questions in Section Bcarries one mark.

4. 15 minutes additional time will be given to you to read the questions.

5. The Answer Sheet is inside this Test Booklet. When you are directed to openthe Test Booklet, take out the Answer Sheet and fill in the particulars on SIDE-2carefully with blue/black ball point pen only. In no case pencil is to be used. Read“General Instructions for Candidates” and “Example, How to write and darkencircle on SIDE-2” as given on SIDE-l carefully.

6. Use Blue/Black Ball Point Pen only for writing particulars on this page and writingparticulars and marking responses on SIDE-2 of the Answer Sheet.

7. On completion of the test, the candidate must hand over the Answer Sheet tothe invigilator in the Room/Hall. The candidates are allowed to take away thisTest Booklet with them.

8. The CODE for this Booklet is A. Make sure that the CODE printed on SIDE-2of the Answer Sheet is the same as that on this booklet. In case of discrepancy, thecandidate should immediately report the matter to the Invigilator for replacement ofboth the Test Booklet and the Answer Sheet.

9. The candidates should ensure that the Answer Sheet is not folded. Do not make anystray marks on the Answer Sheet. Do not write your Roll Number anywhere elseexcept in the specified space in the Test Booklet/Answer Sheet.

10. Use of white fluid for correction is not permissible on the Answer Sheet.

Test Booklet Code A

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QUESTION PAPER (CODE NO. LRH)

SECTION - A

1. A student was asked by the teacher to mix the white of an egg with water taken in a

beaker and then stir it well. The student would observe that:

(1) a pale yellow transparent solution is formed

(2) an opaque suspension is formed

(3) a translucent mixture is formed.

(4) egg white floats on the surface of water

2. Which one of the following is not the correct observation when a magnet is moved

repeatedly through a mixture of Iron filings and Sulphur powder kept in a tray ?

(1) Most of the iron filings cling to the magnet at the poles.

(2) A black mass of iron sulphide is produced.

(3) Sulphur does not cling to the magnet.

(4) Sulphur powder is left behind in the tray.

3. The colour of the gas evolved on heating solid lead nitrate is :

(1) yellow

(2) brown

(3) greenish yellow

(4) green

4. Which of the following precaution is incorrect in the determination of boiling point

of water ?

(1) The bulb of the thermometer should be kept about 4 - 5 cm above the surface

of water.

(2) Pieces of pumice stone should be added to water before heating to avoid

bumping.

(3) The final temperature should be noted carefully by keeping the eyes in line

with level of mercury.

(4) The thermometer bulb should dip well below the surface of water.




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5. Four students set up the experiment on plotting the temperature-time graph of a hot

body as it cools to room temperature. They all perform the experiment using identical

apparatus, under identical conditions and plot their graphs on similar graph papers

using similar scales. The teacher asks them to observe their graphs carefully and list

down the (approximate) values of the angles, made with the time axis, by the tangents

to their graphs, at the beginning and towards the end of their observations. The

values, noted by them, were as follows:

Student A : 60° ; 30°

Student B : 65° ; 22°

Student C : 75° ; 14°

Student D : 85° ; 5°

The best noting is likely to be that of student:

(1) A

(2) B

(3) C

(4) D

6. While performing the experiment on determining the velocity of a pulse through a

stretched string, a student has to choose from:

(i) a tightly knit thick cotton string of length 5 m or a woollen string of length 7 m.

(ii) a stop clock of least count 1 s or a stop watch of least count 0.5 s.

For best results he should prefer the combination of :

(1) cotton string and stop clock.

(2) cotton string and stop watch.

(3) woollen string and stop clock.

(4) woollen string and stop watch.




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7. A student has to choose from two available measuring cylinders, and two available

spring balances, with the specifications listed below:

Cylinder C1 : Capacity = 50 mL ; diameter = 1.25 cm, least count = 0.5 mL

Cylinder C2 : Capacity=100 mL ; diameter = 2.5 cm, least count = 1.0 mL

Spring Balance S1: Least count = 2 gwt, zero error = Nil

Spring Balance S2 : Least count = 1 gwt, zero error = + 2 gwt

The solid, whose density is to be determined, is available as a cube of side 1 cm.

The combination, he/she should prefer, is :

(1) C1 ; S

1

(2) C1 ; S

2

(3) C2 ; S

1

(4) C2 ; S2

8. The ‘D’ (or protractor) used for measuring the angle of incidence (∠ i) and the angle

of reflection (∠ r), has to be positioned in the ways illustrated in figures:

(1) W and Y respectively.

(2) W and Z respectively.

(3) X and Y respectively.

(4) X and Z respectively.

9. A student identified the following diagram as that of voluntary muscle fibres.




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The-identification was indicated by the presence of :

(1) intercalated discs

(2) transverse muscle fibres

(3) many nuclei in the periphery

(4) many cells fused together

10. Which one of the following is the correct method of obtaining an onion peel ?

(1) Mash the onion leaf and select the thinnest part

(2) Take a thick scale leaf and make thin sections using a blade

(3) Draw out a thin and transparent piece from the concave surface of scale leaf

using forceps

(4) Use a needle and forceps to remove a thin peel from the convex surface of a

scale leaf.

11. In the. diagram of the earthworm shown below, the position of the mouth is indicated

by:

(1) I

(2) II

(3) III

(4) IV

12. On putting few drops of an unknown liquid on the pH strip as shown here, the

colour of pH strip changed to violet. The liquid taken is likely to be :




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(1) dilute hydrochloric acid

(2) dilute sodium hydroxide

(3) water

(4) dilute acetic acid

13. A student performed an experiment using zinc granules and sodium carbonate with

sodium hydroxide and hydrochloric acid under different conditions as shown here.

He would observe that no gas is evolved in the set up :

(1) I

(2) II

(3) III

(4) IV

14. A student took solid quick lime in a china dish and added a small amount of water.

He heard:

(1) a popping sound

(2) a crackling sound

(3) a hissing sound

(4) no sound at all.

15. The following apparatus is available in the laboratory

Battery : adjustable from 0 to 6 V

Resistors : 4 Ω and 12 Ω

Ammeters : Al of Range 0 to 5 A; Least Count 0.25 A

A2 of Range 0 to 3 A; Least Count 0.1 A




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Voltmeters : V1 of Range 0 to 10 V; Least Count 0.5 V

V2 of Range 0 to 5 V; Least Count 0.1 V

For the experiment to find the equivalent resistance of the parallel combination of

the two given resistors, the best choice would be :

(1) ammeter A1 and voltmeter V

1.

(2) ammeter A1 and voltmeter V2.

(3) ammeter A2 and voltmeter V

1.

(4) ammeter A2 and voltmeter V2.

16. Observe the figures K, L, M, N given below:

The correct way of connecting the ammeter and voltmeter with a series combination

of two resistors in a circuit for finding their equivalent resistance, is shown in diagram:

(1) K

(2) L

(3) M

(4) N




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17. Four students set up the glass slab experiment as shown below:

The correct fixing of the pins P1 and P

2, for ‘defining the incident ray’, and of pins P

3

and P4, for ‘finding the emergent ray’, has been done by student:

(1) (A)

(2) (B)

(3) (C)

(4) (D)

18. The diagram of sclerenchyma tissue given below can be correctly identified because

of the:

(1) thin cell membrane and thick cell wall.

(2) thick cell wall with pits and no nuclei.

(3) large central vacuole and pits in the cell membrane.

(4) long fibre like shape and absence of cytoplasm.




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19. In the diagram of the stomatal pore given below the marking corresponding to the

chloroplast is :

(1) (A)

(2) (B)

(3) (C)

(4) (D)

20. The diagram given below is the experimental set up to show that carbon-di-oxide is

given out during respiration. In this set up what does the test tube marked (X)

contain?

(1) Water

(2) Lime water

(3) Potassium hydroxide

(4) Hydrochloric acid

SECTION - B

21. Common salt can be separated from a mixture of common salt and sand using the

sequence of processes:

(1) dissolution, filtration and evaporation

(2) filtration, evaporation and dissolution

(3) sublimation, dissolution and evaporation

(4) dissolution, evaporation and sublimation.




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22. The volume of a given solid sphere of a metal, is determined to be 20 mL. The mass

of this solid is determined by using the spring balance shown here.

The density of this metal is :

(1) 6.0 g/ cc

(2) 5.9 g/ cc

(3) 5.85 g/ cc

(4) 5.75 g/ cc

23. Upon observing slides showing stages of reproduction in amoeba and yeast, students

reported the following observations :

(i) Cytokinesis was seen in the yeast cell.

(ii) A chain of buds was seen due to reproduction in amoeba.

(iii) In amoeba, elongated nucleus was dividing to form two daughter nuclei.

(iv) Single cells of amoeba and yeast were undergoing binary fission and budding

respectively.

The correct observations are :

(1) (i) and (ii) only

(2) (ii) only

(3) (iii) and (iv) only

(4) (i), (iii) and (iv) only




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24.

In the diagrams (A) and (B) shown above:

(i) The parts marked P in (A) and (B) are organs of reproduction.

(ii) The part marked P in (A) is for defence and in (B) is for absorption of minerals.

(iii) The part marked Q in (A) and (B) are for nutrition.

(iv) The part marked Q in (A) is for food storage and in (B) for making seeds.

The correct statements are:

(1) (i) and (iv)

(2) (i) and (iii)

(3) (ii) and (iv)

(4) (ii) and (iii)

25. A student performed the following four experiments :

He would find formation of solid deposition in experiments:

(1) (II), (III)

(2) (I), (II)

(3) (I), (II), (III)

(4) (II), (III), (IV)




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26. A student was provided with acetic acid by the teacher and asked to conduct an

experiment to study the reaction of acetic acid with litmus solution and sodium

bicarbonate. The student would have reported:

(1) blue litmus solution turned red, a colourless gas was evolved with sodium

bicarbonate.

(2) red litmus solution turned blue, a brown gas was evolved with sodium

bicarbonate.

(3) blue litmus solution remained blue, a green gas was evolved with sodium

bicarbonate.

(4) red litmus solution remained red, a yellow gas was evolved with sodium

bicarbonate.

27. Parallel rays, from a distant tree, incident on the device X, form its distinct image on

a screen as shown. The diagram, correctly showing the image of the tree on the

screen, is diagram:

(1) A and the device X is a convex lens.

(2) A and the device X is a concave mirror.

(3) B and the device X is a convex lens.

(4) B and the device X is a concave mirror.

28. The values of resistances marked on the two coils Rl and R2 are found to be correct.

A student connects the given resistors in the following manner:




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He then connects the terminals marked X and Y above to the terminals marked X

and Y in the circuit given below:

The average value of the ratio V / I in the observations recorded in the above circuit

would be :

(1) more than 6 Ω

(2) equal to 9 Ω

(3) between 3 Ω and 6 Ω

(4) less than 3 Ω

29. While performing the experiment with raisins to determine the percentage of water

absorbed by them, a student recorded the following data:

Weight of the water in the beaker = 50 g

Weight of raisins before soaking = 20 g

Weight of raisins after soaking for one hour = 30 g

Weight of water left in the beaker after the experiment was over = 40 g

The percentage of water absorbed by raisins is :

(1) 10

(2) 20

(3) 45

(4) 50




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30. In the experiment to prove that light is necessary for photosynthesis, the leaf should

be tested for starch after the following four steps:

(i) Keep the potted plant in sunlight for at least 3 - 4 hours.

(ii) Keep the potted plant in complete darkness for about 48 hours.

(iii) Cover a leaf of the plant with black paper strip.

(iv) Pluck the leaf.

The correct sequence of these steps is :

(1) (i), (iii), (iv), (ii)

(2) (i), (iv), (iii), (ii)

(3) (ii), (iv), (iii), (i)

(4) (ii), (iii), (i), (iv)




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Scoring KeyPractical Skills in Science

Series LRH Test Booklet Code A(Outside Regions)

Q. No. Correct Option No.

1 3

2 2

3 2

4 4

5 4

6 2

7 4

8 4

9 3

10 3

11 4

12 2

13 4

14 3

15 3

16 2

17 1

18 *

19 4

20 3

21 1

22 4

23 3

24 2

25 3

26 1

27 1

28 4

29 4

30 4




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