Quiznetik

Physics | Set 1

1. A light year is a measure of :

Correct : C. Distance

2. A device which is used to limit the current in an electrical circuit is called a -

Correct : B. Fuse

3. Two rods, one of copper and other of steel, experience the same up thrust when placed in water. Thus, both have –

Correct : A. equal volume

4. Minimum numbers of unequal vectors which can give zero resultant are -

Correct : B. Three

5. Water is not suitable as a calorimetric substance because it –

Correct : A. has high specific heat

6. When a body falls from an aeroplane, there is increase in its –

Correct : C. Acceleration

7. Which among the following types of coal produces most heat per unit?

Correct : C. Anthracite

8. Which among the following waves is used for communication by artificial satellites?

Correct : A. Micro waves

9. Energy is continuously created in the sun due to –

Correct : A. Nuclear fusion

10. When the barometer reading dips suddenly, it is an indication of –

Correct : C. Storm

11. Good conductor of electricity is –

Correct : D. graphite

12. The fourth state of matter is known as

Correct : C. Plasma

13. Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as ______.

Correct : B. electromagnetic waves

14. Which one of the following instruments is used to study dispersion of light?

Correct : C. Spectrometer

15. A falling drop of rain water ac-quires the spherical shape due to –

Correct : B. Surface Tension

16. This scientist gave the law- ‘Properties of elements are a periodic function of their atomic number.’ This property of the fundamental importance of atomic number was discovered by-

Correct : D. Henry Moseley

17. The mass and energy equivalent to 1 a.m.u. respectively are -

Correct : B. 1.67 x 10−27kg, 930 MeV

18. A spherical ball made of steel when dropped in mercury container will –

Correct : B. will be on the surface of mercury

19. The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as –

Correct : A. Audible sounds

20. Gamma rays have greatest similarity with –

Correct : C. X-rays

21. In the absence of ozone layer, Which rays will enter into atmosphere?

Correct : C. Ultraviolet

22. Light year is the unit of -

Correct : B. Distance

23. An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's –

Correct : A. First law

24. Cathode rays when obstructed by metal cause emission of -

Correct : B. X – ray

25. Sensation of sound persists in our brain for about -

Correct : C. 0.1s

26. Tape recorder should not be kept near one of the following things –

Correct : B. Magnet

27. Which physical quantity is measured in ‘siemens’?

Correct : B. Electrical conductance

28. The surface tension of water on adding detergent to it –

Correct : B. decreases

29. In a refrigerator, the cooling system should always be –

Correct : B. at the bottom

30. Which of the following is optical illusion?

Correct : D. Mirage

31. The base of an electric iron is brightly polished mainly -

Correct : C. to reduce heat loss by radiation

32. If the length of a simple pendulum is halved then its period of oscillation is -

Correct : D. decreased by a factor √ 2

33. Lux is the SI unit of -

Correct : A. intensity of illumination

34. Eclipses occur due to which optical phenomena?

Correct : C. Rectilinear propagation

35. Pure water is bad conductor of electricity because it is –

Correct : A. feebly ionized

36. Pycnometer is an instrument used to measure the –

Correct : A. Density

37. Lamberts law is related to –

Correct : D. Illumination

38. Rain drops acquire spherical shape due to -

Correct : B. surface tension

39. The angular velocity depends upon the rate of change of the _______.

Correct : C. Angular Displacement

40. Coolis tube is used to produce –

Correct : C. X-rays

41. Which of the following is used for regulated electric supply?

Correct : A. Zener diode

42. What is found in frequency modulation?

Correct : A. Fixed frequency

43. When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance?

Correct : A. four times

44. What is the maximum value of deforming force up to which a material shows elastic property and above which the material loses it?

Correct : D. Stress

45. The method of protecting iron from rusting, by coating a thin layer of Zinc is called -

Correct : A. Galvanizing

46. Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by –

Correct : D. Ozone

47. "Curie" is unit of :

Correct : A. Radioactivity

48. Speed of sound is the greatest in :

Correct : C. Glass

49. Laser is a device to produce -

Correct : B. coherent light

50. The hydraulic brakes used in automobiles is a direct application of :

Correct : D. Pascal's law

51. A kilowatt-hour is unit of –

Correct : A. Energy

52. Which of the following is used to split white light into different colors?

Correct : D. Prism

53. Nuclear reactors used to produce electricity are based on –

Correct : A. Nuclear fission

54. Energy that is produced commercially from coal is called –

Correct : C. Thermal energy

55. Which among the following is not a characteristic of transition metals?

Correct : A. Tendency to gain electrons

56. Which one of the following is not a function of the liver?

Correct : D. Reproduction

57. The source of the Sun's energy is the process of –

Correct : C. Nuclear fusion

58. A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -

Correct : A. a parabola

59. Which of the following is a nonrenewable source of energy?

Correct : D. Coal

60. Solar energy is converted into chemical energy during –

Correct : B. Photosynthesis

61. Decibel is the unit used for –

Correct : C. Intensity of sound

62. The term ‘Isoneph' indicates the lines of equal –

Correct : A. cloudiness

63. Fibre optics work on the principle of –

Correct : C. Total internal reflection

64. A decibel is –

Correct : D. A measure of sound level

65. The type of mirrors used in the headlamp of cars is –

Correct : A. Parabolic concave

66. If lift is going up with acceleration, the apparent weight of a body is -

Correct : D. more than the true weight

67. The rate of transfer of charges through a circuit is called?

Correct : C. Current

68. The filament of electric bulb is made up of :

Correct : D. Tungsten

69. When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –

Correct : C. forced vibrations

70. Mud houses are cooler in summers and wanner in winters as compared to brick houses because

Correct : B. mud is a bad conductor

71. Electricians use rubber gloves while working because -

Correct : A. rubber is an insulator

72. When a person sitting on a swing stands up on the swing, the frequency of oscillation –

Correct : B. increases

73. Night photography and photopraphy in mist and fog are possible using –

Correct : B. infra-red radiation

74. An Athlets runs before long jump to get advantage on –

Correct : A. Inertia of motion

75. In sunlight, a rose appears red. In green light, the same rose appears –

Correct : B. black

76. The sparkling of a diamond is due to –

Correct : A. total internal reflection of light

77. Ocean currents are an example of –

Correct : A. convection

78. Which of the following is a good conductor of heat but a bad conductor of electricity?

Correct : D. Mica

79. A piece of wood is held under water. The up thrust on it will be:

Correct : B. less than weight of the wood

80. In MRI machine, which one of the following is used?

Correct : D. Magnetic wave

81. For a person having hypermetropia, the near point is –

Correct : A. greater than 25 cm

82. Amount of water vapour in the atmosphere is measured in terms of –

Correct : A. Humidity

83. Name the process of production of energy in the Sun –

Correct : C. Nuclear fusion

84. The ozone hole that has been detected lies in the atmosphere above –

Correct : B. Antarctica

85. The device used to change the speed of an electric fan is –

Correct : B. Regulator

86. Which one of the following wavelengths of light is most effective in photosynthesis?

Correct : A. Blue

87. Why is it difficult to breathe at higher altitudes?

Correct : A. Due to low air pressure

88. The reason for a swimming pool to appear less deep than the actual depth is –

Correct : A. Refraction

89. Alternating current is converted into direct current by a –

Correct : D. Rectifier

90. Remote-sensing device has an inbuilt source of –

Correct : D. Infrared ray

91. The atmosphere is heated mainly by –

Correct : C. Radiation

92. The atmospheric layer reflecting radio waves is called –

Correct : B. Ionosphere

93. 'Cryogenics' is a science dealing with –

Correct : B. low temperatures

94. Heat from the Sun reaches the Earth by

Correct : C. Radiation

95. The commonly used thermometric substance is _____.

Correct : C. Mercury

96. Gamma rays can cause –

Correct : A. gene mutation

97. The dimension of which of the following is the same as that of impulse?

Correct : B. Momentum

98. Which among the following is the fundamental quantity?

Correct : B. Time

99. Global warming is expected to result in

Correct : D. All of the above

100. A transformer works on the principle of –

Correct : B. Mutual induction