» General : CBSE Sample Question Papers

Q. 1. What is the approximate wavelength range for the visible spectrum?
Answer

Q. 2. Why copper wire is not used in potentiometer?
Answer

Q. 3. When the length of a microscope tube is increased how is its magnifying power affected?
Answer

Q. 4. The curves show voltage current relationship for two photo cathodes illuminated by a single source. In what way the cathodes dif¬fer?
Answer

Q. 5. A point charge is rotated in a circle of radius r around a charge q. What will be net work done?
Answer

Q. 6. A 900 pF capacitor is charged by a 100 V battery. How much electrostatic energy is stored by the capacitor? .
Answer

Q. 7. What is the direction of current at the cold junction of a copper-bismuth thermocouple?
Answer

Q. 8. How do comets form tails?
Answer

Q. 9. What are (i) terrestrial planets and (ii) jovial planets? Give one example of each.
Answer

Q. 10. Suppose that the potential energy between electron and proton in hydrogen atom at a distance r is given by U = -ke2 /3r3.
(i) What is the force between them?
(ii) What is the radius of such an orbit?
Answer

Q. 11. What is an electromagnetic wave? How an electromagnetic wave is possible in space?
Answer

Q. 12. Calculate the frequency associated with a photon of energy 3.3xl0-20 J. (h = 6.6xl0-34 Js).
Answer

Q. 13. Neutrons produced in fission can be slowed down even by using ordinary water. Then, why is heavy water used for this purpose?
Answer

Q. 14. Calculate the luminous intensity of 200 W tungsten lamp whose efficiency is 18 Im/W. What are the assumptions?
Answer

Q. 15. An electric dipole free to move is placed in a uniform electric field. Explain along with diagram its motion when it is placed (a) parallel to the field (b) perpendicular to the field.
Answer

Q. 16. A capacitor is joined to a cell, a resistance R, an ammeter and a key when the key is pressed write the expression for the current in terms of resistance R capacitance C and e.m.f. e.
Answer

Q. 17. Show, by drawing ray diagrams, how a totally reflecting glass prism can be used to deviate a ray of light through (i) 90° (ii) 180°.
Answer

Q. 18. Give a diagram from which it is clear that “taller the antenna, longer the coverage of the television broadcast".
Answer

Q. 19. State laws of photoelectric effect
Answer

Q. 20. In J J. Thomson’s method, prove that the specific charge of an electron is given by the expression 1/r E/B2 where r is the radius of the circular path produced by electron in the region of magnetic field B and E the electric field applied.
(i) Give Huygens ‘Principle of secondary wavelets, (ii) Show graphical¬ly the intensity distribution in a single slit diffraction pattern.
Answer

Q. 21. The critical angle for total internal reflection for saphire surrounded by air is 34.4°. Calculate the polarising angle for saphire if the light is incident from air.
Answer

Q. 22. Define capacitance. Derive an expression for the capacitance of a parallel plate capacitor with vacuum.
Answer

Q. 23. A circular conducting wire loop of radius r, with a current i is placed in a magnetic field perpendicular to its plane. Find the force on a small part dl of the conducting wire and the force of compression in the wire. When the magnetic field is switched off what happens to the radius of the loop?
Answer

Q. 24. (i) What is electrolysis? (ii) How long will it take to deposit electrolytically 10.79 g of silver on the cathode of a silver voltmeter by a current of 25 A? (ece of silver = 0.001118 g/C).
Answer

Q. 25. Explain how the masses of two stars belonging to a binary system can be determined?
Answer

Q. 26. Show that the angle of minimum deviation produced by a thin prism is reduced to one-fourth (with respect to air) when it is immersed hi water. Given _en_g = 3/2 and _{enw = 4/3.
Answer}

Q. 27. (a) Show that the contact potential difference between two dissimilar metals is given by
φ = W₁-W₂ / e
where W₁ and W₂ are the work functions of the metals.
(b) The e.m.f of a zinc carbon cell is 1.5 volt, how much energy will a system have on dissolution of one zinc ion in a voltameter?
Answer

Q. 28. State Lenz’s law. Show how Lenz’s law follows from the principle of conservation of energy?
Answer

Q. 29. State and explain Faraday’s laws of electrolysis. Define electrochemical equivalent.

OR
Doppler effect can help to decide whether a star is approaching or receding from the earth. Explain how?
Answer

Q. 30. Describe Millikan’s oil drop experiment for determination of charge on an electron.

OR

Drawa ray diagram to show the formation of image of an object placed between the pole and centre of curvature of a concave mirror. Derive the formula connecting object distance (u), image distance (v) and focal length (f) for this particular case for the given concave mirror. State clearly the assumption and sign convention used.
Answer

Very Short Answer Type Question

Q.1. For a fish under water viewing obliquely a fisherman standing on the bank of a lake, does the man look taller or shorter than what he actually is ?
Answer

Q. 2. State two properties of image formed by a plane mirror.
Answer

Q. 3. How is power of a lens related to focal length ?
Answer

Q. 4. What is the cause of change in direction of a ray of light on refraction ?
Answer

Q. 5. Define resolving power of an optical instrument. How does it depend on wavelength ?
Answer

Q. 6. In what way Galileo telescope differs from ordinary terrestrial telescope ?
Answer

Q. 7. What is the magnifying power of an astronomical telescope in normal adjustment ? What is its length ?
Answer

Q. 8. What is magnifying power of a microscope. What is it equal to ?
Answer

Q. 9. What is magnifying power of an astronomical telescope when the final image of a distant object is formed at least distance of distinct vision ?
Answer

Q. 10. Give the units of luminous intensity and intensity and illumination.
Answer

Q. 11. What is Lens maker’s formula ?
Answer

Q. 12. What is dispersion of light ?
Answer

Q. 13. What are Fraunhoffer’s lines ?
Answer

Q. 14. In what way, Galileo telescope differs from an ordinary terrestrial telescope ?
Answer

Very Short Answer Type Questions

Q. 1. What are electromagnetic waves ?
Answer

Q. 2. How does the relation c = 1/√µ₀ €₀ indicate that the velocity of all types of em waves in free space is the same?
Answer

Q. 3. What is a plane polarised e.m. wave?
Answer

Q. 4. What is Maxwell’s modification of Ampere’s circuital law?
Answer

Q. 5. What is displacement current?
Answer

Q. 6. Name various layers of earth’s atmosphere.
Answer

Q. 7. What is the use of Ozone layer?
Answer

Q. 8. Large distance radio broadcasts use short wave bands, why? -
Answer

Very Short Answer Type Question

Q. 1. What is magnetic flux ? Give its SI unit.
Answer

Q. 2. What is the relationship between e.m.f. and magnetic flux ?
Answer

Q. 3. What is the direction of induced current when main current in an inductive current is (a) switched on (b) switched off ?
Answer

Q. 4. Is Lenz’s law in accordance with law of conservation of energy ?
Answer

Q. 5. What is common in L/R and CR ?
Answer

Q. 6. Why does an LC circuit produce oscillations ?
Answer

Q. 7. A conductor is moved in a direction parallel magnetic field. Explain whether an induced current will be developed.
Answer

Q. 8. What is a generator ?
Answer

Q. 9. Name the various losses in a transformer.
Answer

Q. 10. What are mean value and RMS value of AC ?
Answer

Q. 11. Give the expression for the energy stored in a capacitor and an inductor.
Answer

Q. 12. What is sharpness of resonance ?
Answer

Q. 13. Which is more dangerous, a.c. or d.c. ?
Answer

Q. 14. Can a transformer be used to alter d.c. voltage ?
Answer

Q. 15. How does capacitor behave to d.c. ?
Answer

Q. 16. What value of a.c. is given by an a.c. ammeter ?
Answer

Q. 17. Frequency of a.c. source is doubled. How are K, XL and Xc get affected?
Answer

Q. 18. In an a.c. circuit, why is there is no power consumption for an ideal inductor ?
Answer

Q. 19. A lamp is connected in series with a capacitor. What will happen if d.c. or a.c, is connected to current ?
Answer

Q. 20. Which is more dangerous, a.c. or d.c, ?
Answer

Q. 21. A resistance of 6 ohm is connected in series with inductor and capacitor having reactances 36 and 44 ohm respectively. What is the combined impedance ?
Answer

1. Mention the different types of sacred monuments that we have inherited from the past. What does the large variety of sacred monuments reflect?
Answer :

2. Give a brief account of Buddhist and Jain literary works.
Answer :

3. Mention in brief the measures you can suggest to conserve and protect the forests.
Answer :

4. Compare and contrast the climatic requirements and soil requirements of wheat and rice.
Answer :

5. What are soils? How are they formed?
Answer :

6. Distinguish between metallic and non-metallic minerals.
Answer :

7. (a) What is an economy?
(b) What do you mean by economic development?
Answer :

8. What do you mean by privatisation?
Answer :

9. Give a brief account of the international consumer movement.
Answer :

10. Mention constitutional provisions to protect the rights of children.
Answer :

11. Describe the mechanism of caste system as practised in the past.
Answer :

12. What is NAM? Has NAM lost its relevance with the end of the cold war?
Answer :

13. Distinguish between revolutionaries and terrorists.
Answer :

14. Discuss the threats to our heritage.
Answer :

15. Mention some important elements of our literary heritage.
Answer :

16. Why is cotton textile industry located in Maharashtra and Gujarat?

Or

Describe the importance of unsurfaced roads in the Indian economy.
Answer :

17. What measures will you suggest to face the challenge of globalisation in the area of agriculture?

Or

Why do you think that nuclear energy is bound to play an increasingly important role in India?
Answer :

18. What do you mean by sex ratio? Account for the declining sex ratio in India.
Answer :

19. What are the dimensions of gender inequity in India? What do you mean by gender-empowerment?
Answer :

20. Give a brief description of important temples in east and south India.
Answer :

21. What role does power play in industrialisation of our country? What steps would you suggest to conserve energy?
Answer :

22. Outline the steps that have been taken for improvement and modernisation of Indian railways after independence.
Answer :

23. Give a brief review of important fruits in India.

Or

Describe, in brief, the cycle of agricultural seasons in India.
Answer :

24. What is the magnitude of poverty in India? Has the number of persons living below the line of poverty declined during the last three decades?
Answer :

25. How has globalisation affected the international migration of labour? What has been the response of the developed countries and the developing countries to these trends?
Answer :

26. What are Human Rights? What is the Universal Declaration of Human Rights?

Or

Name some important insurgent groups in North-East.
Answer :

27. (a) On an outline map of India, show the following:
(i) Garo-Khasi Jaintia Hills;
(ii) River Kosi;
(iii) River Tungabhadra.
(b) On an outline map of India, show the important sugar-grow ing areas in India.
© On an outline map of India, locate and label the following:
(i) Mangalore Port;
(ii) Guwahati Software Technology Park;
(iii) Ahmedabad—Vadodara Industrial region.
Answer :

1. Give two examples of monuments, which had to be transplanted to new areas because of submergence.
Answer :

2. How has the Ancient Monuments and Archaeological Sites and Remains Act of 1958 helped to preserve ancient historical monuments? Explain two points.
Answer :

3. Below are given in List A the names of different means of irrigation and in List B the percentages of net sown area irrigated by them. Write against each method of irrigation the relevant percentage area irrigated by it.
List A: (i) Canals; (ii) Other sources; (iii) Tanks and (iv) Tube wells and wells.
List B: 57%; 6%; 31% and 6%.
Answer :

4. How does the depletion of forests affect the eco-system? Explain two points. (2x1 = 2) J&.
Answer :

5. Since the land under pasture has reduced, what impact did it have on cattle rearing? Explain two points.
Answer :

6. Why is woollen textile industry concentrated in Northern India? Give two reasons.
Answer :

7. Where was the first cement plant set up in India? What is the reason for the fast expansion of cement industry in India?
Answer :

8. Why has the importance of telecom industry been increasing in recent days? Give two reasons.
Answer :

9. Explain the concept of sustainable economic development. Explain two points.
Answer :

10. Explain the two effects of increase in income on prices.
Answer :

11. Explain with example the meaning of disguised unemployment.
Answer :

12. What is the main focus of gender empowerment?
Answer :

13. Explain two effects of high rate of growth in population on unemployment in India.
Answer :

14. “India’s living heritage can be seen and felt in our every day life". Explain with four examples.
Answer :

15. Name and describe the two categories into which cultural heritage is divided. Give one example for each.

Or

Name any four rivers of India. What has been their contribution to our cultural heritage?
Answer :

16. Analyze any four factors which help in the formation of soils.
Answer :

17. Explain the two poverty alleviation programmes (with their nature and objectives) adopted by the Government of India.
Answer :

18. “Human Development is the essence of social development.” Explain any four points.
Answer :

Science Class X (CBSE)
You are on Questions

Max Marks : 75
Time allowed : 3 hrs

General Instructions :
(i) All questions are compulsary.
(ii) Question number 1 to 10 are very short answer question,carrying 1 mark each.They are to be answered in one or two sentences.
(iii) Question number 11 to 20 are short answer questions,each carrying 2 marks. Answer to them should not exceed 40 words each.
(iv) Question numbers 21 to 30 are also short answer questions,each carrying 3 marks. Answer to them should not exceed 60 words each.
(v) Question numbers 31 to 33 are long answer questions,each carrying 5 marks. Answer to them should not normally exceed 100 words each.

Q.1 What will be the effect of increase in the amount of carbon dioxide in the atmosphere on the average temparature of earth ?

Q.2 A chemical factory in a village discharges its waste, rich in nitrogen compounds, into a pond. How will it affect the growth of phytoplanktons?

Q.3 In the following food chain, plants provide 2000 J of energy to Rats. How much energy will be available to Hawks from the snakes?
Plants - Rats - Snakes - Hawks

Q.5 Why is the outer part of the candle flame blue?

Q.6 Fermentation of sugar solution with enzymes is being carried out in a vessel at 20°C - 30° in the presence of air. Which organic compound will be produced in this process?

Q.7 A doctor examined a patient and advised him to take more lemon, orange and amla in his diet. Write any two symptoms that the doctor might have noticed in the patient.

Q.8 A constellation having seven prominent stars is visible during the winter. Name the constellation.

Q.9 An element X on reacting with oxygen forms an oxide X₂O. This oxide dissolves in water and turns blue litmus red. State whether element X is a metal or a non-metal.

Q.10 The number of protons in the nucleus of an atom of an element of mass number 238 is 92.What will be the number of neutrons in its isotope of mass number 235?

Q.11 Galaxies A and B are x light years apart while C and D are 1.5x light years apart. In which pair will the two galaxies be moving faster away from each other ? Give reasons for your Answer ?

Q.12 Why is charcoal considered a better fuel than wood? Give four reasons.

Q.13 In textile mills a white substance having a strong smell of chlorine is used to remove yellowness of white clothes. Identify the substance. Hos is it prepared? Write chemical equation of the reaction involved.

Q.14 A water pump can lift 500 kg of water to a tank situated at a height of 10 m in 10 s. Calculate The power of the pump. [ g = 10 m/s2].

Q.15 How is an ester prepared in the laboratory? Write its one use in daily life.

Q.16 A gardener by mistake has sown seeds of sunflower too deep in a wet fertile soil. How will this practice influence the production of sunflower crop? Give two reasons for your answer.

Q.17 Wastes of which of the following two materials is more polluting - polythene or paper? Give reasons for your answer.

Q.18 List four conditions for life to exist on a planet.

Q.19 What are synthetic detergents? Give one example of a synthetic detergent. Write its two advantages over soaps.

Q.20 What is the principle of working of solar heater ? Write two major drawbacks of all solar heating devices.

Q.21 What causes the wind to blow ? Explain the principle of working of a windmill. State two advantages of using wind energy.

Q.22 Why does the iron present in the inner core of the earth remain in solid form despite high temperature ? How does our earth act like an engine ?

Q.23 An electric meter shows the consumption of one unit of electrical energy for heating 20 kg of water. What would be the rise in temperature of water if the entire electrical energy is used only to heat the water ? (Specific heat of water = 4200 J/kg/°C)

Q.24 What are enzymes? Name its substituents. How are some fruits affected by the action of enzymes. Give one method to reduce the activity of enzymes on fruits.

Q.25 With the help of a labelled diagram and necessary chemical equations describe the preparation of methane in the laboratory.

Q.26 We do not consume harmful chemicals as such, then how do they enter our body? Which of the two persons is likely to have more concentration of harmful chemicals - a vegetarian or a non-vegetarian? Give reasons.

Q.27 Why is replenishment of soil essential? Describe two natural ways of soil replenishment.

Q.28 Distinguish between dry heating and wet heating of foodgrains. Write two harmful effects of wet heating.

Q.29 Name the three characteristics which describe the orbit of an artificial satellite around the earth. Illustrate them on a diagram. When is a satellite said to be in geostationary orbit ?

Q.30 How is energy liberated in the Sun ? What would happen when all the hydrogen in the Sun gets consumed ? Describe the two steps involved.

Q.31 What is a balanced diet? How does the balanced diet depend on special needs? Explain with the help of two examples. Why the roughage and water important part of balanced diet. Name two sources of roughage in our diet.

Q.32 With the help of labelled diagrams, explain the construction and working of a diesel engine. State any two differences between a petrol engine and a diesel engine.

Q.33 Name the chief ore of iron. What are the three raw materials used in the production of iron from its ore? With the help of a labelled diagram of a blast furance, describe the extraction of iron from its ore. Write the chemical equations of the reactions involved in the furnace.