Quiznetik

Physics | Set 5

1. The light rays used for eliminating bacteria –

Correct : D. ultra-violet radiation

2. The audio signals of TV are –

Correct : B. Frequency modulated

3. Red light is used for signals because it has –

Correct : A. long wavelength

4. The washing machine works on the principle of -

Correct : D. Centrifugation

5. Which zone of a candle flame is the hottest?

Correct : C. Middle luminous zone

6. 'Hydraulic brakes' work on the principle of –

Correct : A. Pascal's law

7. The instrument for measuring intensity of earthquakes is called –

Correct : D. Seismograph

8. Which one of the following animals can hear ultrasonic sound?

Correct : D. Bat

9. ‘Therm' is the unit of –

Correct : B. Heat

10. Newton's first law of motion gives the concept of –

Correct : D. Inertia

11. When heated from 0° to 10°C volume of a given mass of water will -

Correct : D. Decrease and after will increase

12. Which of the following is an ex-ample for cantilever beam?

Correct : B. Bridge

13. It is difficult to cook rice –

Correct : A. at the top of a mountain

14. Angle of friction and angle of repose are

Correct : A. Equal to each other

15. If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will –

Correct : C. Fall into his hand

16. A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?

Correct : A. Increase

17. Stars in the sky appear to twinkle due to –

Correct : A. a series of refractions

18. A pilot has to release the bomb to hit a target –

Correct : C. before the target

19. Parabolic mirros are used in –

Correct : A. Car headlights

20. Which atmospheric layer contains ozone layer?

Correct : C. Stratosphere

21. Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:

Correct : A. increases

22. Which of the following is the best conductor of Electricity?

Correct : B. Sea water

23. Rate of change of momentum is -

Correct : C. Force

24. An ice block with a piece of lead embedded in it floats in water. If ice melts the water level –

Correct : B. Falls

25. A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle?

Correct : B. Parabolic

26. The frequency of ultrasound wave is typically –

Correct : C. Below 20 kHz

27. Intensity of gravitational field of earth is maximum at –

Correct : A. Poles

28. The spokes used in the wheel of a bicycle increase its –

Correct : A. Moment of inertia

29. A soap bubble shows colours when illuminated with white light. This is due to –

Correct : C. Interference

30. A boy sitting in an open car moving with the constant speed throws a ball straight up into the air.

Correct : A. The ball falls –

31. The process involved in making soap is

Correct : A. Saponification

32. A pond of water appears less deep due to –

Correct : C. Refraction

33. The oldest type of energy known to man is –

Correct : D. Geothermal energy

34. The source of the sun's energy is the process of –

Correct : C. Nuclear fusion

35. A multimeter is used to measure –

Correct : D. All of the above

36. In the atmosphere ultraviolet rays are absorbed by –

Correct : A. Oxygen

37. Which of the following metals is used for the manufacture of heating elements provided in electric iron?

Correct : C. Nichrome

38. When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –

Correct : C. diffusion

39. Clear nights are colder than cloudy nights because of –

Correct : C. radiation

40. In AC circuits, AC meters measure –

Correct : B. rms values

41. When a light wave is reflected from a mirror, there is a change in its –

Correct : B. amplitude

42. A body absorbs heat most if it is –

Correct : A. black and rough

43. Which of the following is not a vector quantity?

Correct : B. Electric current

44. Which one of the following is used for determining the structure of crystal -

Correct : B. X-rays

45. How many terminals do an electric cell has?

Correct : B. 2

46. Water from soil enters into the root hairs owing to :

Correct : B. Capillary pressure

47. The unit of electrical power is –

Correct : B. Watt

48. The scientist who first sent electromagnetic waves to distant places is –

Correct : C. Thomas Alva Edison

49. Conversion of chemical energy into electrical energy occurs in –

Correct : C. a battery

50. Damp clothes are dried in spin dryers by the action of –

Correct : B. centrifugal forces

51. Which colour of light shows maximum deviation when passed through a prism?

Correct : C. Violet

52. Which one of the following is called a red planet?

Correct : C. Mars

53. Which of the following is the unit of distance in navigation?

Correct : B. Nautical mile

54. The sharpness of a television image is termed as its –

Correct : C. Resolution

55. 0°K is equivalent to

Correct : B. -273°C

56. What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as?

Correct : A. Hubble telescope

57. Which law is also called the law of inertia?

Correct : A. Newton's first law

58. Ohm’s law obeyed in -

Correct : A. a metallic conductor

59. Solar energy is due to –

Correct : A. fusion reactions

60. The plastic material commonly used for making gear wheels is –

Correct : B. Nylons

61. The nuclear force is -

Correct : B. Short range attractive force

62. The angle in which a cricket ball should be hit to travel maximum horizontal distance is :

Correct : B. 45° with horizontal

63. The minimum number of geostationary satellites needed for un-interrupted global coverage is

Correct : B. 2

64. Which type of mirror is used in the head lights of vehicles?

Correct : B. Concave mirror

65. The height of a geo-stationary satellite from the Earth's surface is approximately :

Correct : A. 36,000 km

66. Shaving mirror is –

Correct : B. Concave

67. Magnifying Glass is basically a –

Correct : C. Convex lens

68. The velocity of heat radiation in vacuum is –

Correct : A. Equal to that of light

69. Which of the following is the best conductor of electricity?

Correct : B. Sea water

70. Which of the following colours has got the maximum refractive index for glass?

Correct : C. Red

71. The working principle of a washing machine is :

Correct : A. centrifugation

72. The hydraulic brake used in automobiles is a direct application of -

Correct : D. Pascal's law

73. Longitudinal waves and Transverse waves are types of -

Correct : A. Mechanical waves

74. Due to rusting the weight of iron -

Correct : B. Increases

75. Water will not be vaporized if –

Correct : C. the humidity is 100%

76. Which of the following is not a part of a CRT?

Correct : D. Gas plasma

77. Decibel is a term connected with :

Correct : C. sound

78. As we go from Equator to North pole the value of `S, the acceleration due to gravity

Correct : C. increases

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

Correct : D. Silver

80. Flight Recorder is technically called :

Correct : C. Black box

81. The part of the eye having the largest refractive index is -

Correct : C. lens

82. The centre of gravity of a sprinter during the race lies –

Correct : A. Ahead of his feet

83. Which of the following liquids has the least density?

Correct : C. Petrol

84. The hair of shaving brush clings together when removed from water due to –

Correct : A. Surface tension

85. If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be :

Correct : D. 1350 W

86. Submerged objects can be located using

Correct : B. Sonar

87. A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will -

Correct : A. Increase

88. Where are mesons found?

Correct : A. Cosmic rays

89. A larger force on a rotating body results in larger               .

Correct : C. Axis of rotation

90. Which of the following is used in oven?

Correct : C. Microwaves

91. The instrument used to see the distant objects on the Earth is –

Correct : A. Terrestrial telescope

92. Which of the following principle is used to produce low-temperatures'?

Correct : D. Adiabatic demagnetization

93. A current carrying conductor is associated with –

Correct : C. an electro-magnetic field

94. The weakest of all fundamental forces is –

Correct : A. Gravitational force

95. Which of the following instruments is used to measure humidity?

Correct : C. Sling Psychrometer

96. A micron is equal to –

Correct : C. 0.001 mm

97. Persons suffering from myopia are advised to use –

Correct : B. concave lens

98. If cream is removed from milk, its density –

Correct : A. Increases

99. A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will -

Correct : C. remain the same

100. A steam engine converts the heat energy of steam into           .

Correct : C. Mechanical energy