Quiznetik

Physics | Set 9

1. The term ‘Higgs Boson’ is associated with -

Correct : C. God Particle

2. Kilowatt-hour (KWH) is the unit of -

Correct : D. energy

3. Major portion of the earth’s crust is mainly constituted by -

Correct : B. Oxygen and Silicon

4. The mirror used by ENT specialist is:

Correct : B. Concave mirror

5. Fibre optics work on the principle of -

Correct : C. total internal reflection

6. The reverse effect of X-ray emission is

Correct : D. Photoelectric

7. The group of solar cells joined together in a definite pattern is called a –

Correct : D. Solar cell panel

8. Fuse wire is made of an alloy of –

Correct : A. Tin and Lead

9. The colour of the ocean appears to be blue because the sunlight falling on it is –

Correct : D. scattered

10. During which of the following operating conditions of an auto-mobile, carbon monoxide content in exhaust gas is maximum?

Correct : C. Idle running

11. The least distance of distinct vision is –

Correct : B. 25 cm

12. Sound waves can be transmitted by any

Correct : A. Medium

13. Which term is not associated with sound wave?

Correct : C. Candela

14. If an electron and a photon have the same wavelength, then they will have the same –

Correct : B. linear momentum

15. In hydel power station, the motion produced in turbines is due to –

Correct : A. flow of water

16. The point where total mass of a body is supposed to be concentrated is known as –

Correct : B. Centre of mass

17. Curie is an unit of –

Correct : A. Radioactivity

18. The mass of an electron in motion depends upon -

Correct : B. B its velocity

19. Water drops cannot stick to the oily surface due to –

Correct : B. surface tension

20. Decibel is the unit of             .

Correct : B. Intensity of sound

21. Magnetic keepers are pieces of –

Correct : D. Soft iron

22. Certain substances loose their electrical resistance completely at super low temperature. Such, substances are called.

Correct : A. Super conductors

23. In a transistor, the base is               .

Correct : B. a conductor of low resistance

24. Sound waves are produced by -

Correct : C. Vibrating bodies

25. The weight of a body acts through the centre of –

Correct : A. gravity

26. A wheel-barrow is an example of –

Correct : D. class II lever

27. The work done by the string of a simple pendulum during one complete oscillation is equal to

Correct : D. Zero

28. The minimum number of forces to keep a particle in equilibrium is –

Correct : B. 2

29. Which instrument is used to record the speed of a vehicle?

Correct : C. Speedometer

30. Human ear responds to intensities in range -

Correct : A. 10-12Wm-2 to 1Wm-2

31. Speed of sound in air depends on the -

Correct : B. Physical conditions

32. The redness in atmosphere at Sunrise and Sunset is due to –

Correct : D. Scattering of light

33. Which of the following are methods of heat transfer?

Correct : A. Convection

34. Which of the following is the most common element in the Universe?

Correct : C. Hydrogen

35. If there were no gravity, which of the following will not be there for a fluid?

Correct : D. Upward Thrust

36. Person who is colorblind cannot distinguish between –

Correct : B. Red and green

37. When we see an object, the image formed on the retina is –

Correct : A. Real and inverted

38. The most malleable metal is -

Correct : C. gold

39. Which of the following was the first theory of super conductivity?

Correct : B. London theory

40. Which of the following is the unit of Astronomical Distance?

Correct : D. Parsec

41. If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?

Correct : D. 1 : 4

42. S.I. unit of Magnetic flux is –

Correct : A. weber

43. Convex mirror is generally used in -

Correct : D. rear view mirror

44. Rotational axis of which of the following planet is highly tilted?

Correct : B. Uranus

45. A needle or a pin floats on the surface of water because of –

Correct : A. Surface tension

46. An object which absorbs all colours and reflects none appears:

Correct : D. Black

47. Alfred Nobel invented -

Correct : C. Dynamite

48. Instrument used to study the behaviour of a vibrating siring is :

Correct : D. (4) Sonometer

49. The mass of water vapour per unit volume of air is known as -

Correct : C. absolute humidity

50. If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to               .

Correct : A. 300 m

51. Quality of transmission depends upon

Correct : C. Both (1) and (2)

52. The oil in the wick of an oil lamp rises up due to:

Correct : A. capillary action

53. Which of the following properties is generally found, in non-metals?'

Correct : A. Brittleness

54. Electro-static precipitator is used to control –

Correct : D. Air Pollutants

55. The Newton's First Law is also called as

Correct : B. Law of inertia

56. Hydraulic machines work under the principle of –

Correct : C. Pascal’s law

57. The scientist who first discovered that the Earth revolves round the Sun was -

Correct : C. Copernicus

58. The type of minor used in automobiles to see the traffic on the rear side is –

Correct : D. Convex

59. Lognitudinal waves and Transverse waves are types of -

Correct : A. Mechanical waves

60. The brightest planet is             .

Correct : C. Venus

61. Sound in TV is modulating -

Correct : A. AM

62. Density of water is maximum at

Correct : C. 4 degree Celsius

63. Formation of shadows can be explained by -

Correct : A. rectilinear propagation of light

64. A liquid disturbed by stirring comes to rest due to –

Correct : C. viscosity

65. In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?

Correct : D. White hole

66. The Laser is a beam of radiations which are –

Correct : B. Coherent and monochromatic

67. Ice float on water because its density is

Correct : B. less than water

68. Distances of stars are measured in –

Correct : D. Light year

69. Loudness of sound depends on –

Correct : C. Amplitude

70. A man jumping out of a moving train is thrown -

Correct : A. forward

71. Blowing Air with open pipe is an example of –

Correct : C. Isobaric process

72. The amount of matter in a ball of steel is its –

Correct : B. Mass

73. When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:

Correct : B. double

74. The weight of a body at the centre of earth is:

Correct : B. zero

75. The component used for tuning a radio is basically a variable –

Correct : B. Condenser

76. 0°K, is equivalent to –

Correct : B. -273°C

77. What type of force acts on a car moving around a curve?

Correct : C. Centripetal force

78. Which one among the following is not an electromagnetic wave?

Correct : C. Cathode Ray

79. Which one of the following is a good electrical conductor?

Correct : A. Graphite

80. Which °fine metals has the maximum thermal conductivity?

Correct : C. Silver

81. What do radioactive substances emit?

Correct : D. α, β and γ rays

82. The term ‘Higgs Boson' is associated with –

Correct : C. God Particle

83. Addition of suitable impurities into semiconductor, is called –

Correct : A. Doping

84. When a ship enters the sea from a river what will be the effect?

Correct : C. It rises a little

85. Hydroscope is an instrument that shows changes in:

Correct : D. None of these

86. Unit of resistance is –

Correct : B. volt/ampere

87. A cycle tyre bursts suddenly. This represents an –

Correct : B. Adiabatic process

88. Global warming is expected to result in

Correct : D. All of the above

89. Which is best used as a sound absorbing material in partition walls?

Correct : C. Glass – wool

90. The dimensional formula ML⁻¹T⁻² corresponds to –

Correct : A. Modulus of elasticity

91. Purity of a metal can be determined with the help of –

Correct : C. Archimedes principle

92. If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by –

Correct : B. 4 times

93. Which phenomenon is responsible for the echo of sound wave?

Correct : A. Reflection

94. Which of the following has the lowest frequency?

Correct : A. Visible light

95. A fresh egg when placed in salt water will –

Correct : C. float

96. What is the unit of relative density?

Correct : D. It has no unit

97. Hydraulic brakes in automobile work on –

Correct : B. Pascal's principle

98. The gas used in a refrigerator is -

Correct : D. cooled down when expanded

99. The main purpose of the spacecraft "messenger" is :

Correct : C. Mapping and investigating the Mercury

100. Light scattering takes place in –

Correct : A. Colloidal solutions