PHYSICS II

21. Which of the following actions will double the period of a simple pendulum?

a. double the length of the pendulum

b. double the mass of the bob

c. double the mass of the bob 2 times greater

d. make the pendulum four times long.

22. Which of the following functions is performed by a photo-cell?

a. it converts magnetic energy into electrical energy

b. it converts chemical energy into electrical energy

c. it converts electrical energy into light electrical

d. it converts light energy into electrical energy

24. Which of the following is an insulator?

a) aluminium b) copper c) glass d) silver

25. Light emerging from a nicol prism has

a. vibrations in all directions

b. no vibration at all

c. vibration in two mutually perpendicular directions

d. vibrations in only one direction

27. The splitting of a beam of white light into different color is

a) refraction b) reflection c) dispersion d) none of these

28. The density of pure water will be

a) maximum at 4 ° C b) minimum at 4 ° C c) maximum at 0 ° C d) minimum at 0 ° C

29. When a vehicle passes, TV reception gets distorted due to

a. metal reflecting radio waves

b. sparkplug creating electromagnetic disturbances

c. passing vehicle affecting TV components

d. use of electronic ignition system

30. The lowest level energy band in a solid is called

a) valence bond b) conduction bond c) Fermi level d) equal level

31. Pure silicon is used in

a) Electronic industry b) Textile industry c) Paint industry d) Pharmaceuticals

32. Electrons can be accelerated to very high energies by means of

a) thyratrons b) magnetrons c) betatrons d) cyclotrons

33. The size of the atomic nucleus is

a. 10-14 m b. 10-10 m c. 10-24 m d. 10-6 m

34. If you move towards a plane mirror at a speed of 10 cm/s at what speed does your image approach you?

a) 5 cm/s b) 10 cm/s c) 20 cm/s d) information inadequate

35. The minimum lengths of a plane mirror in which a person can see himself in full length should be

a. equal to the person’s height

b. slightly more than his height

c. nearly half of his height

d. nearly one fourth of his height

36. On adding a little antimony to germanium, we get

a) p-Type semiconductor b) n-type semiconductor c) metallic conductor d) intrinsic semiconductor

37. A 100 watt bulb will consume one unit of electrical energy in

a) 1 hour b) 10 hours c) one day d) 60 hours

38. Which one of the following is not correctly matched?

a. Hydraulic press - Archimedes principle

b. Lift of airplane - Bernoulli’s principle

c. Paint – gun - Newton’s third law

d. Electron microscope - Refraction of electron waves

39. Choke is used to

a. reduce the current in AC circuit

b. reduce the current in DC circuit

c. convert AC to DC

d. convert DC to AC

40. The centre of the Newton’s rings pattern is dark since

a. the light undergoes a phase change p

b. the glass plate and the plato – convex lens are in contact with each other at the centre

c. the light undergoes a phase change 2p

d. the light undergoes a phase change 2p

41. Which planet has the maximum number of known satellites?

a. Saturn b. Jupiter c. Mars d. Uranus

42. What is the source of electrical energy in an artificial satellite?

a. a dynamo b. a thermopile c. solar cells d. a Van de Graff generator

43. A filament bulb has a rating of 220 V 40 W. The resistance (in ohms) of its filament is

a. 1110 b. 1210 c. 1310 d. 1410

44. The most suitable metal for making permanent magnets is

a. soft iron b. steel c. copper d. aluminium

45. When light travels from air into a glass slab, there is no change in its

a. speed b. wavelength c. amplitude d. frequency

46. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

a. 4.2 seconds b. 42 seconds c. 4.2 years d. 42 years

47. When ultraviolet light falls on a metal it emits

a. electrons b. protons c. neutrons d. photons

48. An atomic pile is used for

a. producing X – rays

b. conducting nuclear fission

c. conducting nuclear fusion

d. disposing of nuclear waste

49. A cyclotron is used for

a. producing highly penetrating rays

b. starting a chain fission reaction

c. starting a fusion reaction

d. accelerating neutrons

50. Cadmium rods are used in a nuclear reactor for

a. slowing down the neutrons

b. speeding up slow neutrons

c. absorbing neutrons

d. regulating the power level of the reactor