weekly assignment - sainik school, satara

Month- DECEMBER Week – 1

Class- VII Subject- English

Complete the following assignment questions

I Want Something In A Cage Comprehension Check Page No 38 and 39.

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Class- VII Subject- Marathi


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Class- VII Subject- Maths

Complete the following assignment questions 1. Find the supplement of 1050 ? 2. What is the measure of the complement of 690 ?

3. A/an …………….. connect a vertex of a triangle to the midpoint of the opposite side..

4. The difference in the measures’ of two complementary angles is 12°. Find the

measures of the angles.

5. How many altitudes does a triangle have?.

6. Write SSS congruence criterion two times.

7. Write SAS congruence property.

8.. Which of the following is not a congruence criterion? (a) SSS (b) SAS (c) ASA (d) AAA

9. Find the value of x in the given figure.

10. The hypotenuse of a right triangle is 17 cm long. If one of the remaining two sides is 8 cm in length, then the length of the other side is:

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Class- VII Subject- Physics

Complete the following assignment questions 1. Describe how we calculate time period of a simple pendulum. 2. Differentiate between slow and fast objects. 3. What are the factors on which time period of a pendulum depends? 4. Represent the following graphically: (a) An object at rest (b) An object moving with uniform speed (c) An object moving with non-uniform speed 5. The odometer of a car reads 24830 km at 1:25 PM, 24865 km at 2:05 PM and 25005 km at 3:15 PM. Calculate the speed of the car in km/h and m/s from 1:25 PM to 3:15 PM.

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Class- VII Subject- Chemistry

Complete the following assignment questions Q.1.Explain the factors responsible for the depletion of water table.

Q.2.Fill in the blanks with the appropriate answers: . (a) People obtain groundwater through and . (b) Three forms of water are solid, and . (c) The water bearing layer of the earth is . (d) The process of water seepage into the ground is called .

Q.3.You have been asked to maintain a garden. How will you minimise the use of water?

4 Fill in the blanks with the appropriate answers:

(a) People obtain groundwater through _______ and ________.

(b) Three forms of water are ________, ________ and ________.

(c) The water bearing layer of the earth is ________.

(d) The process of water seepage into the ground is called ________.

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Class- VII Subject- Biology

Complete the following assignment questions 1. Name the term used for openings in the nose

2. Differentiate between : Inhalation and Exhalation

3. What ATP stands for?

4. Name the term used for one inhalation plus one exhalation.

5.Draw and describe : Human Respiratory System

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Class- VII Subject- History

Complete the following assignment questions 1.What are the features of tribal socities.? 2.What were the functions of pastoral and tribal people. 3.Write a short note on the emergence of Gond Kingdom ,their administration and down fall ? 4. Which social change came among tribal people ?

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Class- VII Subject- Geography

Complete the following assignment questions ------------------------------------------------------------------------------- 1Discuss the importance of tides. 2. What are the causes of movement of ocean currents? 3. On an outline map of the world mark the cold and warm ocean currents in Pacific, Atlantic, Indian and Arctic Ocean. 4. How is hydrosphere useful to us? 5. Distinguish between Waves and Tides. 6. Why does the pressure decrease with altitude? 7. Describe the structure of the atmosphere. 8. List four useful features of the atmosphere. ---------------------------------------------------------------------------------

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Class- VIII Subject- English

This is Jody’s Fawn

Extra Questions Reference to Context

Passage

He waited for the sound of the hooves to end, then cut to the right. The scrub was still. Only his own crackling of twigs sounded across the silence. He wondered for an instant if he had mistaken his direction. Then a buzzard rose in front of him and flapped into the air. He came into the clearing under the oaks. Buzzards sat in a circle around the carcass of the doe. They turned their heads on their long scrawny necks and hissed at him. He threw his bough at them and they flew into an adjacent tree. The sand showed large cat prints but the big cats killed fresh, and they had left the doe to the carrion birds.

Question 1. How could he hear the ‘cracking of twigs’?

Question 2. Was he sure of his direction?

Question 3. What were buzzards doing around the carcass of doe?

Question 4. Whose footprints were imprinted on the sand?

Question 5. ‘Hooves’ is a plural form of………

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Complete the following assignment questions Month- DECEMBER Week – 1

Class- VIII Subject- Marathi


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Class- VIII Subject- Maths


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Class- VIII Subject- Physics

Complete the following assignment questions 1) What do you mean by a battery?

2) Mention two terminals of a cell.

3) Define: Electrolyte

4) What do you mean by the electrodes?

5)Why is wireman advised to use rubber gloves?

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Class- VIII Subject- Chemistry

Complete the following assignment questions 1List conditions under which combustion can take place.

2 Explain how the use of CNG in automobiles has reduced pollution in our cities.

3 Give reasons. (a) Water is not used to control fires involving electrical equipment. (b) LPG is a better domestic fuel than wood. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

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Class- VIII Subject- Biology

Complete the following assignment questions 1. Define reproduction.

2. Draw neat labeled diagram of : female reproductive system

3. What is sexual reproduction?

4. Which organ produces egg in female human body?

5. What is the difference between sexual and asexual reproduction?

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Class- VIII Subject- History

Complete the following assignment questions 1. Why did William jones feel the need to study Indian history, philosophy and law ? 2. Why did Mahatma Gandhi think that english education had enslaved Indians ? 3. Why did James Mill and Thomas Macaulay think that European education was essential in India ? 4. List some of the tribals of India with their inhabitation ? 5. What were the views of Rabindra Nath tagore about Education ?

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Class- VIII Subject- Geography

Complete the following assignment questions ------------------------------------------------------------------------- 1. Describe the different types of coal. 2. List three basic ways through which energy is obtained. 3. ‘Mineral conservation can delay in crises’. Explain. 4. Describe the different methods of extracting minerals. 5. Describe the economic importance of minerals. Describe the main types of minerals. 6. Write the short note on the conservation of Soils. 7. Distinguish between Evergreen Forest and Deciduous forests. =======================================================

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Class- IX Subject- English

Complete the following assignment questions 1. Why was Sue worried when Johnsy fell ill? 2. How did Sue try to revive Johnsy’s interest in life? 3. Why was Johnsy counting the leaves on the creeper outside her window? 4. What did Sue feel when she saw the last leaf on the creeper? Who was at the window with her? 5. Why was Sue nervous to draw back the window curtains?

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Class- IX Subject- Marathi


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Class- IX Subject- Maths

Complete the following assignment questions 1

2

3

4. The areas of three adjacent faces of a cuboid are x, y and z. Find the total surface area of the cuboid.

5. If each side of a cube is increased by 10%. What is the percentage increase in surface area of the cube ?

6. The radius and height of a cone are in the ratio 4:3. The area of the base is 154 cm2. Find the curved surface area.

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

8. In a hot water heating system there is a cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface area in the system.

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Class- IX Subject- Physics

Complete the following assignment questions 1) Why does a gunman get a jerk on firing a bullet?

2) Why is it difficult to walk on a slippery road?

3) The car A of mass 1500kg moving at 25 m/s collides with

another car B of mass 1000 kg moving at 15 m/s in the same

direction. After collision the velocity of car A becomes 20m/s.

Calculate the velocity of car B after the collision.

4)Draw a diagram to show how rocket engine provides a force to

move the rocket upwards.

5) Find the acceleration produced by a force of 5 N acting on a mass

of 10 kg.

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Class- IX Subject- Chemistry

Complete the following assignment questions 1 Define the atomic mass unit

2 Why is it not possible to see an atom with naked eyes?

3 Which postulate of Dalton’s atomic theory can explain the law of definite proportions?

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Class- IX Subject- Biology

Complete the following assignment questions 1) Differentiate between xylem and phloem. 2) How xylem parenchyma is different from xylem fibres. 3)Explain the role of xylem in the conduction of water and minerals. 4)What is phloem? 5)Name the dead components present is xylem. 6)Write any two characteristics of parenchyma.

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Class- IX Subject- History

Complete the following assignment questions 1. Which institution is empowered to administer justice in India? 2. What kind of judiciary do we have in India? 3. What is meant by by Judicial review/ 4. What is meant by independent judiciary? 5. How can you say that judiciary in India is one of the most powerful in the world. 6. How can a judge be removed?

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Class- IX Subject- Geography

Complete the following assignment questions ---------------------------------------------------------------------------- 1. How do north east trade winds of India get reversed into south west monsoon winds? 2. Describe the tropical cyclone. 3. Name the cycles which are hit during Oct, Nov and Dec months in India in 2020. 4. What are the characteristic features of Advancing Monsoon? 5. Give an account of weather conditions and characteristics of the retreating monsoon seasons. 6. What is the significance of dust storms in northern India? 7. Explain temperature conditions during retreating Monsoon. 8. Which regions of India are mainly affected by tropical cyclones of India? 9. Where are changes of seasons are more perceptible in India? 10. What is mean by breaks in rainfall? ====================================================

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Class- X Subject- English

Complete the following assignment questions Question1. 1. What is a sermon? Is it different from a lecture or a talk ? Can this word also be used in a negative way or as a joke (as in “my mother’s sermon about getting my work done on time ”) ? Question 2. Find out the meanings of the words and phrases given in the box :

Question 3. When her son dies, Kisa Gotami goes from house to house. What does she ask for ? Does she get it ? Why not ?

Question 4. Kisa Gotami again goes from house to house after she speaks with the Buddha. What does she ask for, the second time around ? Does she get it ? Why not ?

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Class- X Subject- Marathi


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Class- X Subject- Maths


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Class- X Subject- Physics

Complete the following assignment questions 1) What colours make up white light?

2) Why do different coloured Ray's deviate differently in a prism?

3) Why the planets don't twinkle?

4) The stars seem higher than they actually are. Explain.

5)Name two effects produced by the scattering of light.

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Class- X Subject- Chemistry

Complete the following assignment questions 1 What is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds?

2 What is meant by a sturated hydrocarbon?

3 Define the following terms-

(a)Homologous series

(b)Unsaturated hydrocarbon

4 Write first members of homologous series of alkane and alkyne

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Class- X Subject- Biology


1. Define environment?

2. What is a food chain?

3. List out the components in a food chain? ...

4. What is a food web?

5. What is pollution?

6. Explain the effects of human activity on the environment?

7. Define ozone layer?

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Class- X Subject- History

Complete the following assignment questions 1. Why do we need at least two parties in a democratic system? 2. How is government formed in a multiparty system? 3. What are called national parties? 4. What are called recognized political parties? 5. Which party is recognized as a state party? 6. How can people put pressure on multi party system? 7.Write short notes on single party system and two party system with examples.

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Class- X Subject- Geography


1. Discuss the hazards of mining on the life of miners and on the environment. 2. Mention any three major iron ore belts of India. Write any three characteristics of the southernmost iron ore belt. 3. What are the different varieties of iron ore? How will you differentiate between them? Give any three points. 4. Explain rat hole mining in the tribal areas. 5. Why is Chotanagapur Plateau called a ‘Storehouse of Minerals’? 6. How do minerals occur in Sedimentary rocks? 7. Explain three properties of Mica. 8. How is Biogas produced? Why is it called’ Gobar Gas Plant’ in rural India? 9. What is Tidal energy? Name a region of India which provides ideal conditions for utilizing Tidal energy? 10. Why do we need to conserve energy resources? 11. What is geothermal energy? Write in details about it. =======================================================

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Class- XI Subject- English

Complete the following assignment questions Give reasons for the following statements. 1. The article has been titled ‘Silk Road.’

2. Tibetan mastiffs were popular in China’s imperial courts.

3. The author’s experience at Hor was in stark contrast to earlier accounts of the place.

4. The author was disappointed with Darchen.

5. The author thought that his positive thinking strategy worked well after all.

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Class- XI Subject- Maths

Complete the following assignment questions. 1. Find the value of x for which the points (x,-1) (2,1) and (4,5) are collinear.

2. Find the angle between the lines x+y+7=0 and x-y+1=0.

3. Find the values of k for the line k 3x 4 k 2 y k 2 7k 6 0 which is parallel to the x-axis. 4. Find the equation of straight line passing through the point (2,3) and perpendicular to the line 4x 4 y 10. 5. Find the Equation of the line through the intersection of 3x 4 y 1 0 and

5x y 1 0 which cuts off equal intercepts on the axes.

6. Find the coordinates of the points, which divide internally and externally the line segment joining (1, –3) and (–3, 9) in the ratio 1 : 3. 7. Find the centroid of the triangle with vertices at (–1, 0), (5, –2) and (8, 2).

8. Find equation of the line bisecting the segment joining the points (5, 3),

(4, 4) and making an angle 450 with the x-axis.

9. Determine the angle B of the triangle ABC with vertices A(–2, 1), B(2, 3) and C(–2, –4).

10. If 3x by 2 0 and 9x 3y a 0 represent the same straight line, find the

values of ‘a’ and ‘b’.

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Class- XI Subject- Physics

Complete the following assignment questions 1. A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²? (a) 2 mm² (b) 3 mm² (c) 4 mm² (d) 5 mm²

2. In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be (a) E (b) 2 E (c) 4 E (d) 25 E

3. Two wires A and B are of the same length. The diameters are in the ratio 1 : 2 and the Youngs modulus are in ratio 2 : 1. if they are pulled by the same force, then their elongations will be in ratio (a) 4 : 1 (b) 1 : 4 (c) 1 : 2 (d) 2 : 1

4. Hookes law essentially defines (a) Stress (b) Strain (c) Yield point (d) Elastic limit

5. Longitudinal strain is possible in the case of (a) Gases (b) Liquid

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(c) Only solids (d) Only gases & liquids

6. Two wires have the same material and length, but their masses are in the ration of 4 : 3. If they are stretched by the same force, their elongations will be in the ratio of (a) 2 : 3 (b) 3 : 4 (c) 4 : 3 (d) 9 : 16

7. A rubber cord of cross sectional area 1 mm² and unstretched length 10 cm is stretched to 12 cm and then released to project a stone of mass 5 gram. If Y for rubber = 5 ? 108N/m², then the tension in the rubber cord is (a) 25 N (b) 50 N (c) 100 N (d) 200 N

8. Out of the following materials, whose elasticity is independent of temperature? (a) Copper (b) Invar steel (c) Brass (d) Silver

9. An iron bar of length l m and cross section A m² is pulled by a force of F Newton from both ends so as to produce and elongation in meters. Which of the following statement statements is correct (a) Elongation is inversely proportional to length l (b) Elongation is directly proportional to cross section A (c) Elongation is inversely proportional to A (d) Elongation is directly proportional to Youngs modulus

10. The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as (a) Youngs modulus (b) Poissons ratio (c) Lateral strain (d) Shearing strain

11. Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied? (a) 0.50 m, 0.50 mm (b) 1.00 mm, 1.00 mm (c) 2.00 m, 2.00 mm (d) 4.00 m, 4.00 mm


Class- XI Subject- Chemistry


1. Compressibility factor, Z, of a gas is given as Z = (pV/nRT) (i) What is the value of Z for an ideal gas? (ii) For real gas what will be the effect on value of Z above Boyle’s temperature?

2. Explain the effect of increasing the temperature of a liquid, on intermolecular forces operating between its particles, what will happen to the viscosity of a liquid if its temperature is increased?

3. One of the assumptions of kinetic theory of gases states that “there is no force of attraction between the molecules of a gas.” How far is this statement correct? Is it possible to liquefy an ideal gas? Explain.

4. Value of universal gas constant (R) is same for all gases. What is its physical significance?

5. Use the information and data given below to answer the questions (a) to (c):

Stronger intermolecular forces result in higher boiling point. Strength of London forces increases with the number of electrons in the

molecule. Boiling point of HF, HCl, HBr and HI are 293 K, 189 K, 206 K and 238 K

respectively. (a) Which type of intermolecular forces are present in the molecules HF,

HCl, HBr and HI? (b) Looking at the trend of boiling points of HCl, HBr and HI, explain out of

dipole-dipole interaction and London interaction, which one is predominant here.

(c) Why is boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest?

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Class- XI Subject- Biology

Complete the following assignment questions Q.1. Define: a) Tidal volume b) Residual volume c) Asthma 2. Organize the following in ascending order a) Tidal volume b) Residual volume c) Inspiratory reserve volume d) Expiratory capacity 3. Write the organs of respiration in the entities given below: a) Flatworm b) Frog c) Birds d) Cockroach 4. List the following steps in a sequential manner for the completion of the respiration process. a) Diffusion of oxygen and CO2 across the alveolar membrane b) Transportation of gases by blood c) Utilization of oxygen for catabolic reactions by the cells and hence the resultant release of CO2 d) Pulmonary ventilation through which atmospheric air is drawn in and carbon dioxide-rich alveolar air is given out e) Diffusion of oxygen and carbon dioxide between tissues and blood 5 . Describe the role of the neural system in controlling respiration.

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Class- XI Subject- Computer

Complete the following assignment questions 1.Draw flowcharts for five of computing problem/programs of python 2. Develop algorithms for five of computing problems/ programs of python 3. Explain different types of errors in python programming

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Class- XII Subject- English

Complete the following assignment questions Find the following literary devices used in the poem ‘Thing of Beauty’ and write them in your notebook:

1. Anaphora: Use of same word in two consecutive lines

2. Alliteration: Use of consonant sound at the start of two words which are close in series Metaphor:

3. Imagery: creating a sensory effect of beautiful things lined up in a string

4. Inversion: normal order of words is reversed

5. Antithesis: opposite words placed together

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Class- XII Subject- Maths

Complete the following assignment questions.

1. (i) Find the differential equation of the family of curves

y = ex (A cos x + B sin x), where A and B are arbitrary constants.

(ii) Find the differential equation of an ellipse with major and minor axes 2a and 2b respectively.

(iii) Form the differential equation corresponding to the family of curves y = c(x – c)2.

(iv) Form the differential equation representing the family of curves (y – b)2 = 4(x – a).

(v) Form the differential equation of the family of circles touching y-axis at (0, 0).

(vi) Form the differential equation of family of parabolas having vertex at (0, 0) and axis along the (i) positive y-axis (ii) positive x-axis.

(vii) Form differential equation of family of circles passing through origin and whose centre lie on x-axis.

2. Solve the differential equation:

(i) (1 – y) x dxdy (1 + x) y = 0.

(ii) dxdy (2log 1)

sin cosx x

y y y

(iii) 22 yxxy

dxdy

(iv) xy

dxdy 2

(v) (x2 + 2xy – y2) dx + (y2 + 2xy – x2) dy = 0

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Class- XII Subject- Physics

Complete the following assignment questions Question 1. Which of-the following is not a property of light? (a) It can travel through vacuum (b) It has a finite speed (c) It requires a material medium for its propagation (d) It involve transportation energy

Question 2. Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be: (a) n (b) 2n (c) π2 (d) zero

Question 3. The phase difference between the electric and the magnetic field vectors in electromagnetic waves is (a) π4 (b) π2 (c) π (d) zero Question 4. A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is : (a) π2 (b) π4 (c) π (d) zero

Question 5. Which of the following cannot be polarised? (a) radiowaves (b) transverse waves

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(c) sound waves (d) X-rays

Question 6. Light year is the unit of: (a) distance (b) time (c) intensity of light (d) None of these

Question 7. If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is: (a) 10 ms-1 (b) 5 ms-1 (c) 20 ms-1 (d) 15 ms-1

Question 8. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to w ater is: (a) 8/9 (b) 9/8 (c) 7/6 (d) 2

Question 9. The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is: (a) 1√3 (b) √2 (c) 1 (d) can’t be determined

Question 10. A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface: (a) 1√3 (b) √3 (c) 13 (d) 3

Question 11. A concave mirror of focal length f produces an image n times the size of the object. If the image is real then the distance of the object is: (a) (n – 1) f (b) (n + 1) f (c) (n+1n)f (d) (n−1n)f

Question 12. A convergent lens will become less convergent in : (a) oil (b) water (c) both of (a) and (b) (d) none of these

Question 13. A thin glass (RI = 32) lens has optical power of – 5D in air. Its optical power in a liquid medium with RI = 1.6 will be: (a) -2.5 D (b) 25 D (c) -ID (d) 0.625 D

Question 14. On reflection from a denser medium, a light wave suffers a phase difference of: (a) π (b) π2 (c) π4 (d) 2π

Question 15. The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called: (a) geometrical optics (b) physical optics (c) corpuscular optics (d) quantum optics

Question 16. When light travels from one medium to another, which of the following does not change? (a) frequency (b) refractive index (c) velocity (d) wavelength

Question 17. Two lens of power -15 D and +5 D are placed in contact co-axially. The focal length of equivalent lens is: (a) -10 cm (b) -20 cm (c) +10 cm (d) None

Question 18. Refractive index of water and glass are 43 and 53. A light ray is going to water from glass. Then, its critical angle will be: (a) sin-145 (b) sin-156 (c) sin-112 (d) sin-1(21)

Question 19. The air bubble inside water shine due to: (a) Reflection

(b) Refraction (c) T.l.R. (d) None of these

Question 20. When a ray of light (white) enters a lens, undergoes a change is: (a) wavelength (b) velocity (c) frequency (d) both velocity and wavelength

Question 21. Radio waves from an antenna travel with the velocity of: (a) light (b) sound (c) ultrasonics (d) supersonics

Question 22. A point object is placed at the centre of a glass sphere of radius 6 cm 3 and RI = 32. The distance of virtual image from the surface of the sphere is : (a) 2 cm (b) 4 cm (c) 6 cm (d) 12 cm

Question 23. The RI. of the material of a prism is √2 and its refracting angle is 30°. One of the refracting surface of the prism is made a mirror. A beam of monochromatic light entering the prism from the other face retraces its path, after reflection from mirror surface. The angle of incidence on prism is: (a) 0° (b) 30° (c) 45° (d) 60°

Question 24. A telescope has an objective lens of 10 cm diameter and is situated at a distance of 1 km from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when seen in the light of mean λ = 5000 A is of the order of: (a) 5 mm (b) 5 cm (c) 0.5 m (d) 5 m

Question 25. When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is : (a) polarized (b) of longer λ (c) of shorter λ (d) of high intensity

Question 26. A convex lens is dipped in a liquid, whose R.I. is equal to that of R.I. of material of the lens. Then its focal length will: (a) become zero (b) become infinite (c) reduce (d) increase

Question 27. The velocity of light in vacuum is 3 × 1010 cms-1. The velocity of light in a medium (µ = 1.5) is: (a) 2 × 1010cms-1 (b) 4.5 × 1010cms-1 (c) 1.5 × 1010cms-1 (d) None of these

Question 28. Which of the following is not essential for the formation of a pure spectrum? (a) parallel beam of light (b) narrow beam of light (c) screen (d) prism in the minimum deviation position

Question 29. A certain far-sighted person cannot see objects closer to the eye than 100 cm. The power of the lens which will enable him to read at a distance of 25 cm will be? (a) 3D (b) 1D (c) 4D (d) 2D

Question 30. Which produces additional luminiscence in a fluorescent tube? (a) infra red rays (b) ultraviolet rays (c) micro waves (d) radio waves

Question 31. For achromatic combination of lenses, if we use two lenses of focal length f’ and f1 dipersive power to ω and ω’ respectively, then (a) ω = ω0, ω’= 2ω0, f’ = 2f (b) ω = ω0, ω’ = 2ω0, f’ = -2f (c) ω = ω0, ω’ = 2ω0, f’ = f/2 (d) ω = ω0, ω’ = 2ω0, f’ = -f/2

Question 32. ar point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:

(a) 40 D (b) -4 D (c) -2.5 D (d) -0.25 diopter

Question 33. Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is: (a) 45 D (b) 9 D (c) 19 D (d) 6 D Question 34. A blue cross on the white background is illuminated with white light and is observed through red filter. What is seen? (a) A red cross on a black background (b) A blue cross on a red background (c) A red cross on a blue background (d) A black cross on a red background

Question 35. The angle of deviation for a prism is greatest for: (a) violet (b) red (c) orange (d) yellow

Question 36. A double convex air bubble in water behaves as: (a) Convergent lens (b) divergent lens (c) plane slab (d) concave mirror


Class- XII Subject- Chemistry


1. In a compound, nitrogen atoms (N) make cubic close packed lattice and metal atoms (M) occupy one-third of the tetrahedral voids present. Determine the formula of the compound formed by M and N?

2. Why does white ZnO (s) becomes yellow upon heating? 3. A sample of ferrous oxide has actual formula Fe0.93O1.00. In this

sample what fraction of metal ions are Fe2+ ions? What type of nonstoichiometric defect is present in this sample

4. Why is FeO (s) not formed in stoichiometric composition?

5. An element X crystallizes in f.c.c structure. 208 g of it has 4.2832 × 1024 atoms. Calculate the edge of the unit cell, if density of X is 7.2 g cm-3.

6. 6.Aluminium crystallizes in an fee structure. Atomic radius of the

metal is 125 pm. What is the length of the side of the unit cell of the metal?6

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Class- XII Subject- Biology

Complete the following assignment questions 1. What is Biotechnology? 2..How is Biotechnology useful in developing food crops and in agriculture process. 3. A gene was being ligated to the plasmid vector to prepare a recombinant DNA during bacterial transformation. An exonuclease was added to the tube accidentally. How will it affect the next step of the experiment?

4. A mixture of the fragmented DNA was run on an agarose gel. The gel was stained with ethidium bromide but no bands were observed. What would be the cause?

5. What is a bioreactor? Explain different types of bioreactors.

WEEKLY ASSIGNMENT


Class- XII Subject- Computer

Complete the following assignment questions 1. Create table for teacher and insert 15 records in it 2. Demonstrate all aggregate commands on this table 3. Demonstrate all group by commands 4. Explain having clause with an examople

WEEKLY ASSIGNMENT

weekly assignment - sainik school, satara

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