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General Instructions :

i) The question-cum-answer booklet contains two Groups, Group – I & Group – II.

ii) Group – I contains two Parts, Part – A & Part- B and Group – II contains two Parts, Part – C & Part – D.

iii) In Group – I, Part – A consists of 39 questions and Part – B consists of 11 questions. In Group – II, Part – C consists of 21 questions and Part – D consists of 6 questions.

iv) Space has been provided in the question-cum-answer booklet itself to answer the questions.

v) Follow the instructions given in Part – A of Group – I and Part – C of Group – II and write the correct answer in full in the space provided below each question.

vi) For Part – B of Group – I and Part – D of Group – II enough space for each question is provided. You have to answer the questions in the space provided.

vii) Space for Rough Work has been printed and provided at the bottom of each page except Page No. 32.

PART - A

Four alternatives are given for each of the following questions / incomplete statements. Only one of them is correct or most appropriate. Choose the most appropriate alternative and write it in the space provided below each question.

39 × 1 = 39

1. The relation between the directions of electric current in magnetic field, and the

mechanical force acting on the conductor is given by

(A) Fleming’s right hand rule (B) Faraday’s law

(C) Fleming’s left hand rule (D) Newton’s law.

2. The dopant needed in the preparation of n type of semiconductor to Germanium is

(A) Phosphorus (B) Indium

(C) Boron (D) Galium.

3. The audio information is changed into corresponding electrical signal in radio

transmitter by

(A) amplifier

(B) oscillator

(C) transducer

(D) microphone.

4.The instrument which converts electricity required for the tape recorder from

domestic circuit is

(A) diode

(B) oscillator

(C) amplifier

(D) voltameter.

5. ‘When we are moving in a cycle which is negotiating a curve, our body leans towardsthe centre of the curve.’ The reason is

(A) Centrifugal reaction (B) Centripetal force

(C) Gravitational force (D) Force of the cycle.

6. In rail tracks the outer rail track is raised in a curve a little above the inner rail track.This reduces

(A) velocity (B) wear and tear

(C) inertia (D) acceleration.

7. The formula to find the force acting between the masses m 1 and m 2 when the distance between them is d, is

(A) F =d 2 m 1/Gm 2

(B) F =m 1 G/m 2 d 2

(C) F =Gm 1 m 2/d 2

(D) F =m 1 m 2/G d 2 .

8. The device that is not required in the diesel engine is

(A) Piston (B) Crankshaft

(C) Carburettor (D) Injection pump.

9. The working stage of the internal combustion engine, with both the inlet and outlet valves closed is

(A) Intake (B) Compression

(C) Crankshaft (D) Exhaust.

10. The proper arrangement of prisms to get composite light from seven colours of light

is

(A) (B)

(C) (D)

11. The colour of the ray which comes out when a red ray of light is passed through a prism is

(A) green (B) white

(C) red (D) yellow.

12. Name of the scientist who showed that the scattered light contained higher and lower frequencies in addition to that of incident light is

(A) Tyndall (B) Rayleigh

(C) C. V. Raman (D) Fraunhofer.

13. Formula to calculate the centripetal force on a body in the circular motion is

(A) f = mv 2 (B) f =mv 2/r

(C) f =m 2 v/r 2 (D) f =rv 2/m .

14. As the multistage rockets go higher and higher then its

(A) velocity decreases (B) mass increases

(C) mass decreases (D) efficiency decreases.

15. Minimum velocity required for a body to escape from gravitational field of the earth is called

(A) orbital velocity (B) escape velocity

(C) initial velocity (D) final velocity.

16. The happening at any part of the world can be viewed in the direct telecast with the help of

(A) Remote sensing satellite (B) Communication satellites

(C) Sounding rocket (D) Spacecraft.

17. Frequency range of the audible sound is

(A) less than 20 Hz (B) more than 20 Hz

(C) 20 Hz to 20 kHz (D) 20 Hz to 200 Hz.

18. The technique used in the study of heart diseases is

(A) Radar ranging (B) Radiography

(C) Radar gun (D) Echocardiography.

19. The colour of the Betelgeuse star is

(A) Orange yellow (B) Bluish white

(C) Yellow (D) Red.

20. The shape of the life-cycle of a star when the internal energy decreases and becomes dimmer until it emits no light is

(A) Protostar (B) Red giant

(C) White dwarf (D) Black dwarf.

21. Irregular patches on the surface of the sun are called

(A) Solar prominences (B) Solar flares

(C) Sunspots (D) Polar light.

22. Which isotope is used in the treatment of overactive thyroid glands ?

(A) Radio Iron (B) Radio Sodium

(C) Radio Iodine (D) Radio Carbon.

23. The metal cover used in the walls of the nuclear reactor to prevent radioactive radiation being released to the environment is

(A) Iron (B) Aluminium

(C) Lead (D) Copper.

24. A nuclear reactor has to be shut down. The rods used for shutting down are made up of

(A) Cadmium (B) Uranium

(C) Steel (D) Liquid sodium.

25. Man has opted for the use of which of the following energies because of rapid depletion of fossil fuels ?

(A) Electrical energy (B) Water energy

(C) Solar energy (D) Wind energy.

26. Reason for painting the black colour on the inside walls of the solar cooker and outer surface of the container is to

(A) increase the absorption of solar energy (B) maintain the quality of food

(C) avoid flowing out of heat energy (D) reflect the solar radiation.

27. Energy crisis means

(A) absence of energy sources (B) energy demand is more than the supply

(C) lack of knowledge to use the energy (D) energy supply is more than the demand.

28. One of the remedial measures to overcome the energy crisis is by using

(A) Compact fluorescent tubes (B) Incandescent electric bulbs

(C) Electric stove for cooking (D) Curtains to windows and using electric light.

29. Name of the copper ore is

(A) Magnetite (B) Malachite

30. Atomic number of iron is 26. Its electronic configuration is

(A) 1s 2 , 2s 2 2p 6 , 3s 2 3p 6 3d 10 , 4s 1

(B) 1s 2 , 2s 2 2p 6 , 3s 2 3p 6 3d 6 , 4s 2

(C) 1s 2 , 2s 2 2p 6 , 3s 1

(D) 1s 2 , 2s 2 2p 6 , 3s 2 3p 2 .

31. Crystal that consists of silicon is

(A) Copper sulphate (B) Topaz

(C) Diamond (D) Graphite.

32. Name of the compound of the silicon used in cutting glass is

(A) Silicon dioxide (B) Sodium silicate

(C) Silicon carbide (D) Sodium aluminium silicate.

33. Molecular formula of ethene is

(A) CH 4 (B) C 2 H 6

(C) C 2 H 4 (D) C 2 H 2 .

34. General formula of alkane is

(A) C n H 2n (B) C n H 2n + 2

(C) C n H 2n – 2 (D) C n + 1 H 2n

35. The chemical used in the detection of leakage of liquid petroleum gas is

(A) Ethyl alcohol (B) Methyl alcohol

(C) Ethyl mercaptan (D) Ethane.

36. The natural polymer is

(A) Rayon (B) Nylon

(C) Fat (D) Terylene.

37. The polymer that is used in the preparation of electrical devices is

(A) Neoprene (B) Polythene

(C) Teflon (D) Thiokol.

38. You have to prepare one prism to disperse light to get spectrum. The glass used is

(A) Colour glass (B) Soda glass

(C) Lead glass (D) Borosilicate glass.

39. The salt which makes permanent hard water is

(A) Magnesium sulphate (B) Magnesium bicarbonate

(C) Calcium carbonate (D) Sodium chloride.

PART – B

40. Mention any two factors that influence induced electromotive force.

41. a) What is photoelectric effect ?

b) Write the four uses of photoelectric effect.

c) How do we get more photons by photoelectric effect ?

42. Write any two laws of Kepler.

43. Draw a neat sketch of petrol engine.

44. a) What is galaxy ? How can we know the information about the velocities of galaxies ?

b) Name the principle by which the motion of galaxies is studied.

45. What is meant by induced radioactivity ? Give one example.

46. Draw a neat sketch of nuclear power plant.

47. a) What is meant by froth flotation ?

b) Explain the method of purification of copper.

48. a) What is isomerism ?

b) Write structural formula of Isobutane.

49. Draw a neat diagram of water purification by permutit process.

50. An environmentalist respects a person who uses soap than a person who uses detergents. Give reason.