1. The resistance of a conductor is inversely proportional to its -
Correct : C. area of cross section
2. is the perpendicular distance between point of application of force and axis of rotation.
Correct : A. Moment arm
3. For which one of the following, "Diodes' are generally used for?
Correct : A. Rectification
4. An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
Correct : B. 15 cm
5. A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
Correct : D. 16/25
6. Which of these waves can be polarized?
Correct : D. Light waves
7. X-rays are –
Correct : C. neutral particles
8. Which of the following is the second largest source of global energy?
Correct : C. Renewable Energy
9. Which of the following methods will separate water from muddy water?
Correct : D. Filtration
10. An a-particle is .
Correct : B. A helium nucleus
11. What type of lens is used to correct vision of a person suffering from Myopia?
Correct : B. Concave lens
12. What is the name of the device used to convert alternating cur-rent into direct current?
Correct : C. Rectifier
13. A light year is a unit of:
Correct : B. Distance
14. The SI unit of luminous emittance is -
Correct : A. Lux
15. Total internal reflection can not take place when light goes from –
Correct : B. water to glass
16. Hertz is a unit for measuring –
Correct : B. Frequency of waves
17. The unit of Planck's constant is –
Correct : A. Js
18. If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
Correct : A. R/4
19. Clouds float in the atmosphere because of their –
Correct : B. low density
20. Which of the following phenomenon is responsible for the movement of water in plants?
Correct : D. Both (2) and (3)
21. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
Correct : A. Scattering
22. Removal of carbon particles from air involves the principle of -
Correct : C. Electrophoresis
23. The focal length of a plane mirror is
Correct : D. Infinity
24. The wire having a green plastic covering is a .
Correct : C. Earth wire
25. Who among the following invented battery?
Correct : C. Alessandro Volta
26. The centre of the reflecting surface of a spherical mirror is called the :
Correct : C. Pole
27. If a bomb dropped from an airplane explodes in mid-air .
Correct : A. its KE increases
28. The phenomenon of radioactivity was discovered by -
Correct : C. Henri Becquerel
29. Energy travels from Sun to Earth through –
Correct : C. radiation
30. Rain drops acquire spherical shape due to -
Correct : B. surface tension
31. Pieces of camphor placed on water move about rapidly. This is because of -
Correct : C. surface tension
32. Which among the following is a vector quantity?
Correct : B. Angular momentum
33. What does the symbol R in electricity stand for?
Correct : D. Resistance
34. The velocity of light in vacuum is :
Correct : A. 3 * 108 ms-1
35. Why does a black board appears black in color?
Correct : D. It absorbs all the colours
36. The pitch of the sound is measured by its:
Correct : C. Frequency
37. Intensity of sound has -
Correct : A. an object existence
38. The south pole of the earth’s magnet is near the geographical .
Correct : D. north
39. Which among the following determines the pitch of a sound?
Correct : B. Frequency
40. Ozone layer above the surface of Earth provides a shield against –
Correct : B. Ultra-violet rays
41. The Newton's First Law is also called as –
Correct : B. Law of inertia
42. Fat can be separated from milk in a cream separator because of .
Correct : D. centrifugal force
43. A charge of 2C passes from one point to the other in a circuit. If the potential difference between the two points is 5V, the amount of work done is :
Correct : A. 10 J
44. The large collection of Stars, dust and gas held together by gravitational attraction between components is known as
Correct : C. Galaxy
45. An amplifier is said to suffer from distortion when its output is -
Correct : C. noisy
46. While catching a ball, a player pulls down his hands to lower the -
Correct : C. impulse
47. Optical fibres are mainly used in-
Correct : A. Communication
48. Radiocarbon dating technique is used to estimate the age of -
Correct : D. fossils
49. 'Parsec' is the unit measurement of -
Correct : B. Astronomical distance
50. Receptors used to detect taste are known as -
Correct : A. Gustatory receptors
51. When a body is immersed in a liquid, the force acting on it is –
Correct : D. Both (1) and (2)
52. Tesla is a unit of magnetic –
Correct : D. field
53. The damage of the human body due to radiation (X-rays or y-rays etc,) is measured in –
Correct : A. Rems
54. Golden view of sea shell is due to -
Correct : C. Polarization
55. An object covers distance which is directly proportional to the square of the time. Its acceleration is –
Correct : D. constant
56. What is impulse equal to?
Correct : A. Change in momentum
57. The person suffering from “myopia” cannot see the objects at:
Correct : B. Longer distance
58. Which one of the following is a non- dimensional quantity?
Correct : B. Strain
59. When water freezes its density –
Correct : A. Decreases
60. Which of the following is the unit of perceived loudness of sound?
Correct : B. Sone
61. The element required for Solar energy conversion -
Correct : B. Silicon
62. The washing machine works on the principle of –
Correct : D. Centrifugation
63. The 'Choke' used with a tube light is basically –
Correct : A. an inductor
64. The temperature of a liquid is 32° F. What is its temperature in Celsius scale?
Correct : B. 0° C
65. Which of the following phenomenon helps to conclude that light is a transverse wave?
Correct : C. polarization
66. Plank's constant has the dimensions of
Correct : A. energy
67. When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?
Correct : A. Nine times
68. The abbreviation LHC stands for which machine?
Correct : B. Large Hadron Collider
69. Which of the following have the same unit?
Correct : C. Work and torque
70. In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to –
Correct : A. 0.1 N
71. Relative humidity is expressed as –
Correct : C. Percentage
72. Why is weightlessness experienced while orbiting the earth in space ships?
Correct : D. None of these
73. Where is a transistor most likely to be found?
Correct : C. Hearing aid
74. What is the SI unit of electric current?
Correct : A. Amperes
75. An object is in static equilibrium when it is .
Correct : A. at rest
76. Equal volumes of different gases at any definite temperature and pressure have-
Correct : D. equal no. of molecules
77. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings"?
Correct : B. Newton's law of cooling
78. Which of the following reaction is the main cause of energy radiated from Sun?
Correct : B. Nuclear fusion
79. Every hot object emits –
Correct : C. Infrared rays
80. Postage Meter was invented by -
Correct : B. Arthur Pitney
81. 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
82. When two semiconductors of p-and n- type are brought in contact, they form p-n junction which acts like a/an –
Correct : C. Rectifier
83. Ohm's law is valid in case of –
Correct : B. conductor
84. The freezing point of fresh water is -
Correct : D. 0°C
85. The unit of noise pollution (level) is –
Correct : A. decibel
86. The boiling point of water decreases at higher altitudes is due to –
Correct : B. low atmospheric pressure
87. The reactivity of an ionic compound element is explained as its tendency to attain noble gas configuration. How do the elements do so?
Correct : C. Both are correct
88. For a ray of light to suffer total internal reflection it has to pass from –
Correct : C. air to water
89. For which of the following substances, the resistance decreases with increase in temperature?
Correct : C. Nichrome
90. A solid needle placed horizon-tally on the surface of the water floats due to –
Correct : C. surface tension of water
91. The first equation of motion gives the relation between :
Correct : C. Velocity and time
92. What is the minimum distance (in metres) required to hear an echo?
Correct : C. 17
93. The intensity ratio of waves is 25:9. What is the ratio of their amplitudes?
Correct : D. 5 : 3
94. Which of these travels in glass with minimum velocity?
Correct : B. violet light
95. The phenomenon which causes mirage is –
Correct : D. Total internal reflection
96. Which of the following is indicated by the colour of a star?
Correct : C. temperature
97. For which one of the following, 'Diodes' are generally used for?
Correct : A. Rectification
98. Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in –
Correct : B. Convection
99. Which one among the following components is used as an amplifying device?
Correct : D. Transistor
100. The commonly used coolant in refrigerators is –