1. Planets do not twinkle because

2. Moment of inertia is:

3. Intensity of sound at a point is ____ its distance from the source.

4. Mercury is commonly used as a thermometric fluid rather than water because

5. Supersonic plane fly with the speed

6. Stars appears to move from east to west because

8. On a stationary sail boat, air is blown from a fan attached to the boat. The boat

9. Siphon will fail to work if:

10. Sound travels at the fastest speed in

11. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

12. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?

13. Intensity of sound has

14. What is the value of 1 kW = ?

15. Minimum number of unequal vectors which can give zero resultant are

16. Light year is a unit of

17. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

18. The earth-wire of a cable is connected to

19. The best conductor of electricity among the following is :

20. Pa(Pascal) is the unit for

21. Sound of frequency below 20 Hz is called

22. Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

23. A Fuse wire is characterised by

24. Sound waves in air are

25. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

27. Radiocarbon is produced in the atmosphere as a result of

28. Materials for rain-proof coats and tents owe their water-proof properties to

29. Planets are

30. Optical fibre works on the

31. Mica is used in electrical appliances such as electric iron because mica is

32. Mach number is used in connection with the speed of

33. Superconductors are substances which

34. Of the following properties of a wave, the one that is independent of the other is its

35. The unit of electrical power is

36. Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.

37. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

38. The fuse in an electric circuit is connected in

39. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2

40. Working of safety fuses depends upon 1. magnetic effect of the current 2. chemical effect of the current 3. magnitude of the current 4. heating effect of the current Select the correct answer using the code given below.

41. Out of the following, which is not emitted by radioactive substance?

42. Mirage is due to:

43. Radiocarbon dating technique is used to estimate the age of

44. Isotopes of an element contain

45. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

46. Metals are good conductors of electricity because

47. Magnetism at the centre of a bar magnet is

48. Large astronomical telescopes always use as objective

49. It takes much longer to cook food in the hills than in the plains, because

50. Safety fuse wire used in domestic electrical appliances is made of metal of low

51. Find the current (in A) when a charge of 1200C flows in 6 seconds.

52. One should not connect a number of electrical appliances to the same power socket because

53. Solar eclipse will take place when

54. Stars twinkle because

55. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

56. Nuclear sizes are expressed in a unit named

57. Copper wires are generally used for electrical power transmission instead of iron wire because :

58. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

59. Light from the Sun reaches us in nearly

60. Oil raise up the wick in a lamp. The principle involves

61. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

62. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

63. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

64. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same:

66. Rectifiers are used to convert:

67. The electric current in a metal wire is due to the flow of –

68. Kilowatt-hour is the unit of :

69. Suitable impurities are added to a semiconductor depending on its use. This is done in order to

70. It is easier to roll a barrel full of coal tar than to pull it because

71. Out of the following pairs, which one does not have identical dimension?

72. ML2T-2 is the dimensional formula for

73. When the main switch of the house is put off it disconnects the

74. Radio telescopes are better than optical telescopes because

75. Inside an aeroplane, flying at a high altitude,

76. It is more difficult to walk on a sandy road than on a concrete road because

77. Of the following natural phenomena, tell which one known in Sanskrit as ‘deer’s thirst’?

78. In which of the following industries is mica as a raw material?

79. The absorption of ink by blotting paper involves:

80. Lux is the SI unit of

81. Stars which appear single to the naked eye but are double when seen through a telescope are

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

83. Which of the following terms is not used in the field of physics?

84. RADAR is used for:

85. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

86. Pick out the scalar quantity

87. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? I. Diffusion II. Refraction III. Internal reflection

88. An electric fuse is based on

89. Light travels at the fastest speed in:

90. Natural radioactivity was discovered by

91. During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to

92. On a rainy day, small oil films on water show brilliant colours. This is due to

93. Rainbow is due to

94. Lightning is caused due to

95. It is easier to roll a stone up a sloping road than to lift it vertical upwards because

96. Identify the vector quantity from the following

97. Which tube used to produce X-ray?

98. Metals are good conductors of electricity because:

99. Railway tracks are banked on curves

100. Electric power is measured in units of