Quiznetik

Physics | Set 2

1. Earth is also known as –

Correct : C. Blue planet

2. The energy that can harness heat stored below the earth's surface is known as –

Correct : D. geothermal energy

3. Green house effect is the heating up of the Earth's atmosphere which is due to –

Correct : C. the infra-red rays

4. Which one of the following is used for sun glasses?

Correct : C. Crooks glass

5. If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is –

Correct : D. 24 cm

6. The colour of sky appears blue due to –

Correct : C. scattering of shorter wave lengths

7. Materials for rain proof coats and tents owe their water proof properties to –

Correct : A. Surface tension

8. If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?

Correct : D. Principle of conservation of linear momentum

9. A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is –

Correct : D. V²/r

10. Which of the following are bad conductors of electricity?

Correct : A. Mica and Quartz

11. What was invented by 'Zacharias Janssen'?

Correct : B. Microscope

12. The unit of measurement of noise is –

Correct : A. Decibel

13. Which of the following devices can be used to detect radiant heat?

Correct : D. Thermopile

14. In which one of the following the phenomenon of total internal reflection of light is used?

Correct : C. Formation of rainbow

15. Period of oscillation of 3 cm microwaves in seconds is

Correct : B. 1 x 10⁻¹⁰

16. When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?

Correct : A. Hydrogen bond formation

17. For which Diode is used?

Correct : D. purificationin

18. The force which opposes the relative motion between different layers of liquid or gases is called –

Correct : D. Viscous Force

19. Water has maximum density at ___.

Correct : C. 4 C

20. Who among the following developed the technology of under-ground nuclear explosion?

Correct : A. Dr. Homi J. Bhabha

21. Sensitivity of the human eye is maximum in the –

Correct : B. Green region

22. The speed of light in air is –

Correct : A. 3 x 10⁸ m/s

23. The speed of light with the rise in the temperature of the medium :

Correct : C. Remains unaltered

24. A rocket works on the principle of conservation of ______.

Correct : B. linear momentum

25. The swing of a spinning cricket ball in air can be explained on the basis of –

Correct : C. Turbulence caused by wind.

26. Which layer of the earth’s atmosphere reflects back the radio waves to the earth’s surface?

Correct : A. Ionosphere

27. What is the process of melting also called?

Correct : A. Fusion

28. A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is –

Correct : A. zero at that place

29. 'Shock-absorbers are usually made of steel as it –

Correct : C. has higher elasticity

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

Correct : C. Elastic Limit

31. With the increase of pressure, the boiling point of any substance –

Correct : A. Increases

32. Among the following materials sound travels fastest in –

Correct : A. Steel

33. Velocity of the sound is minimum in -

Correct : B. Vacuum

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

Correct : B. Melting point

35. The following particles move with same kinetic energy. Which of them has maximum momentum?

Correct : D. Alpha Particle

36. A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect?

Correct : C. Near the neck

37. Lambert's law is related to –

Correct : D. Illumination

38. When a detergent is added to pure water, its surface tension –

Correct : B. decreases

39. Small bubbles are perfectly spherical because of –

Correct : D. Surface tension

40. The final image in a simple microscope is –

Correct : C. virtual, magnified and erect

41. A radioactive substance emits?

Correct : D. all of the three

42. A single fixed pulley is used to draw water from a well because –

Correct : D. force is applied in a convenient direction

43. Hyperrnetropia or longsight can be corrected by using :

Correct : D. Convex lenses

44. Stars appear twinkling because of ______ of light.

Correct : B. Scattering

45. In mirrors the back surface is coated with a thin layer of

Correct : B. Silver

46. A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments –

Correct : A. is zero

47. Sound energy passing per second through a unit area held perpendicular is called -

Correct : A. Intensity

48. Which one of the following is used to remove Astigmatism for a human eye?

Correct : C. Cylindrical lens

49. Speed of sound in air is unaffected by change in :

Correct : A. Pressure

50. The audio signals of TV are :

Correct : B. Frequency modulated

51. Who defined the law of gravitation?

Correct : A. Newton

52. Which of the following parts of the sunlight makes the solar cooker hot?

Correct : C. Infra red

53. What is colour of light related to?

Correct : A. Amplitude

54. What principle/law explains the working of the hydraulic brakes in automobiles?

Correct : C. Pascal's law

55. Which of the following are used for accurately measuring very small time intervals?

Correct : C. Atomic clocks

56. The material which can be deformed permanently by heat and pressure is called a:

Correct : B. Thermoset

57. The mass of a star is two times the mass of the Sun. How it will come to an end?

Correct : A. Neutron Star

58. If the diameter of a capillary is doubled, then the rise of water in it will be –

Correct : B. half

59. The substance which conducts current in the solid state is –

Correct : B. graphite

60. Newton is used to measure             .

Correct : C. Force

61. The mass density of Kerosene is:

Correct : C. Less than water

62. Water is a good solvent of ionic salts because -

Correct : C. It has a high dipole moment

63. For which type of motion, the distance time graph is not a straight line and can be any kind of curve?

Correct : C. Non-uniform motion

64. A device used for converting A.C. into D.C. is called –

Correct : B. Rectifier

65. Energy of Ultraviolet rays is great than

Correct : A. Infra-red rays

66. The surface temperature of the Sun is nearly -

Correct : C. 6000K

67. Light year is a unit of -

Correct : B. distance

68. The strongest force in nature is –

Correct : C. Nuclear force

69. According to the theory of relativity, which of the following al-ways remains constant?

Correct : D. Velocity of light

70. Fog is an example of –

Correct : B. Liquid dispersed in gas

71. 'SONAR' is mostly used by -

Correct : D. Navigators

72. Electrostatic precipitator is used to control —

Correct : A. Air pollution

73. The time period of a second’s pendulum is –

Correct : B. 2 seconds

74. Persistance of vision is the principle behind –

Correct : C. Cinema

75. Metals are good conductors of electricity because –

Correct : A. they contain free electrons

76. The absolute zero is a temperature at which -

Correct : A. Molecular motion in a gas would cease

77. An aircraft can perform aerobatic manoeuvres in a vertical loop because of-

Correct : A. gravity

78. A photostat machine works on –

Correct : B. electrostatic image making

79. If a copper wire is increased to double its length, its resistance will become –

Correct : C. double

80. In a diesel engine the high temperature needed to ignite the fuel is achieved by –

Correct : C. compressing air in the cylinders

81. Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?

Correct : C. Force

82. Which of the following in the correct device that converts thermal energy into electrical energy?

Correct : C. thermopile

83. To measure the speed of an approaching car a police officer shines –

Correct : C. radio waves on it

84. A person wears spectators with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes –

Correct : B. in front of the retina

85. Ohm's law defines –

Correct : A. a resistance

86. Lakes freeze in cold countries in winter, leaving the water underneath at –

Correct : C. 4°C

87. Which one of the following determines the sharpness of image in a camera?

Correct : A. The aperture

88. Light from the Sun reaches us in nearly

Correct : C. 8 minutes

89. Red data book contains data of which of the following?

Correct : C. All endangered species

90. Second’s pendulum is a pendulum which executes one oscillation in:

Correct : C. Two seconds

91. Which of the following is most elastic?

Correct : C. Steel

92. Sound cannot pass through –

Correct : D. Vacuum

93. The instrument used to measure the speed of the wind is –

Correct : B. Anemometer

94. An optically plane surface reflects a beam of light –

Correct : A. as a parallel beam in one direction

95. The slope of a velocity-time graph represents –

Correct : A. acceleration

96. The material which can be deformed permanently by heat and pressure is called a

Correct : A. thermoset

97. On planet Earth, there is no centrifugal force at the –

Correct : D. Poles

98. Gas thermometers are more sensitive than the liquid thermometers because of the gases -

Correct : A. have low specific heat

99. The earth-wire of a cable is connected to –

Correct : B. the fuse of the appliance

100. The best conductor of heat among the following is –

Correct : B. mercury