1. Natural radioactivity was discovered by

2. Electric power is measured in units of

3. Planets do not twinkle because

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

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

6. Pick out the scalar quantity

7. Pa(Pascal) is the unit for

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

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

10. Which tube used to produce X-ray?

11. Isotopes of an element contain

12. Superconductors are substances which

13. Moment of inertia is:

15. Nuclear sizes are expressed in a unit named

16. What is the value of 1 kW = ?

17. The unit of electrical power is

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

19. Kilowatt-hour is the unit of :

20. Rectifiers are used to convert:

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

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

23. Identify the vector quantity from the following

25. 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?

26. Radio telescopes are better than optical telescopes because

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

28. A Fuse wire is characterised by

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

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

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

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

34. Supersonic plane fly with the speed

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

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

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

38. 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

39. Metals are good conductors of electricity because

40. Sound of frequency below 20 Hz is called

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

42. Optical fibre works on the

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

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

45. 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:

46. Mirage is due to:

47. Planets are

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

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

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

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

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

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

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

55. Solar eclipse will take place when

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

57. Stars twinkle because

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

59. 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

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

61. Sound waves in air are

62. Siphon will fail to work if:

63. Rainbow is due to

64. Railway tracks are banked on curves

65. Sound travels at the fastest speed in

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

67. Light travels at the fastest speed in:

68. 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

69. Light year is a unit of

70. An electric fuse is based on

71. Intensity of sound has

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

73. The absorption of ink by blotting paper involves:

74. RADAR is used for:

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

76. Magnetism at the centre of a bar magnet is

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

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

79. Large astronomical telescopes always use as objective

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

81. Lux is the SI unit of

82. Stars appears to move from east to west because

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

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

85. Lightning is caused due to

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

87. 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.

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

89. 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

90. The fuse in an electric circuit is connected in

91. Metals are good conductors of electricity because:

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

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

94. ML2T-2 is the dimensional formula for

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

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

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

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

99. Light from the Sun reaches us in nearly

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