1. The metal used to make lightning conductors is –
Correct : C. Copper
2. The phenomenon of radioactivity was discovered by -
Correct : C. Henri Becquerel
3. If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with–
Correct : C. constant acceleration
4. In a photocell light energy is converted into –
Correct : D. Electrical energy
5. A storm is predicted if atmospheric pressure –
Correct : C. Falls suddenly
6. The smallest unit of classification is -
Correct : A. Species
7. A concave lens always forms an image which is –
Correct : B. Virtual and erect
8. One can distinguish a telescope from a microscope by observing –
Correct : D. length and size of the lens
9. The sound produced by a bat is –
Correct : D. ultrasonic
10. The image of an object formed on the retina of the eye is -
Correct : C. real and inverted
11. In a nuclear reactor, one of the following is used as a fuel.
Correct : B. Uranium
12. Suns heat reaches us by –
Correct : C. Radiation
13. A colour-blind person cannot –
Correct : C. Distinguish between certain colours
14. Forged documents are detected by –
Correct : A. ultraviolet rays
15. In which medium, velocity of sound is maximum?
Correct : A. Metals
16. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
Correct : B. momentum
17. The compound of a metal found in nature is called -
Correct : A. Mineral
18. Decibel is used to measure the intensity of -
Correct : B. Sound
19. Rainbow is seen after rain because of hanging molecules of water which act as –
Correct : B. mirrors
20. Which of the following is a result of Surface tension?
Correct : C. Capillary action
21. Water is used in car radiator because of its –
Correct : C. high specific heat capacity
22. If a metal can be drawn into wires relatively easily it is called:
Correct : B. ductile
23. At what temperature a body will not radiate any heat energy?
Correct : D. -273° C
24. The mirror used for the head light of a car is –
Correct : D. parabolic concave
25. Knot is a measure of –
Correct : A. Unit of speed
26. Stereo was invented by .
Correct : C. Alan Blumlein
27. How much mechanical work must be done to completely melt 1 gram of ice at 0°C?
Correct : B. 80 J
28. A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is –
Correct : A. zero
29. Which of the following is the best conductor of electricity?
Correct : D. Silver
30. At what temperature are the temperature on Celsius and Fahrenheit scales equal?
Correct : C. -40° Celsius
31. The electric charge is stored in a device called:
Correct : B. Capacitor
32. SI unit for the surface tension is .
Correct : C. N/m
33. The density of the liquid when heated
Correct : A. decreases
34. The distance between node and adjacent antinodes is 30 cm. The wavelength is -
Correct : D. 60 cm.
35. When a bar magnet is cut into two equal halves, the pole strength of each piece
Correct : D. remains the same
36. A new technology which provides the ability to create an artificial world and have people interact with it is called –
Correct : B. Virtual reality
37. A proton is identical to .
Correct : D. a beta particle
38. What should a person on a freely rotating turn table do to decrease his (angular) speed?
Correct : C. Spread his hands outwards
39. In a rechargeable cell what kind of energy is stored within the cell?
Correct : C. Chemical energy
40. Which one of the following lenses should be used to correct the defect of astigmatism?
Correct : A. Cylindrical lens
41. Danger signals are generally red as red light –
Correct : B. undergoes least deviation
42. A simple microscope consists of :
Correct : A. a short focus convex lens
43. A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to –
Correct : B. Inertia of motion
44. When pressure is increased the melting point of ice –
Correct : C. decreases
45. What apparatus is used to locate a submerged object?
Correct : B. Sonar
46. The instrument which uses sound waves to measure the depth of oceans is –
Correct : B. Sonar
47. One Kilowatt hour is equal to—
Correct : A. 3.6 Mega Joule
48. Longitudinal waves cannot travel through –
Correct : A. Vacuum
49. Electrostatic precipitator is used to control the pollution of –
Correct : A. air
50. The device which converts AC to DC is
Correct : C. Rectifier
51. What is the minimum escape velocity of rocket to be launched into space?
Correct : C. 11 Km/Sec.
52. How much calorie of energy is released by a boiled egg?
Correct : D. 77
53. Which combination of colour is the most convenient during day and night time?
Correct : D. Red and green
54. The instrument that measures and records the relative humidity of air is –
Correct : B. Hygrometer
55. In a Laser (say neon laser) all the atoms emit the light waves of –
Correct : D. All of the above
56. Which of the following celestial bodies contains abundant quantities of helium-3, a potential source of energy?
Correct : B. Moon
57. Smog is a combination of –
Correct : D. Smoke and fog
58. When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is -
Correct : B. the red ray
59. Study of life in outer space is known as
-
Correct : B. exobiology
60. Lens is made up of –
Correct : B. Flint glass
61. The time period of a pendulum when taken to the Moon would:
Correct : D. increase
62. Pieces of camphor placed on water move about rapidly. This is because of -
Correct : C. surface tension
63. Lightning is caused due to –
Correct : B. electric discharge
64. Sprayer functions on –
Correct : A. Bernouli’s principle
65. Waves that are required for long distance wireless communication are –
Correct : C. Radio waves
66. Rise of oil a wick is due to –
Correct : C. surface tension of the oil
67. Heat stored in water vapour is –
Correct : B. latent heat
68. The layer of atmosphere used for radio- wave transmission is –
Correct : C. ionosphere
69. SI unit of luminous intensity is .
Correct : C. candela
70. A rear-view mirror for driving is –
Correct : C. convex
71. The important unit of a microprocessor is –
Correct : D. All of the above
72. Which one of the following is an element of weather?
Correct : D. All options are correct
73. A periscope works on the principle of
Correct : B. total internal reflection
74. A copper disc has a hole. If the disc is heated, the size of the hole -
Correct : A. increases
75. Water cannot be used to extinguish fire caused by electric current, because –
Correct : A. it may cause electrocution
76. The radiation initially produced in fluorescent tube is –
Correct : B. ultraviolet
77. The 'four stroke petrol engine' is based on –
Correct : B. Otto-cycle
78. The device which transfer the signal from low resistance region to high resistance region is –
Correct : B. transistor
79. A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding?
Correct : C. 2 metres
80. The atmospheric air is held to the Earth by –
Correct : A. gravity
81. In which of the following processes is energy released?
Correct : A. Respiration
82. Atomic power plant works on the principle of –
Correct : A. Fission
83. Which of the following circuit elements is used to 'block' DC in an electronic circuit?
Correct : B. Capacitance
84. Spectacles used for viewing 3D films have –
Correct : D. Polaroid
85. Which of the following has got more heat capacity?
Correct : B. Water
86. Which of the following statements is true when we see 'rainbow'?
Correct : C. In light rainfall, we face Sun
87. If the temperature of a place increases suddenly, the relative humidity –
Correct : B. Decreases
88. Pulsars are :
Correct : C. rapidly spinning stars
89. Tungsten is used for the manufacture of the filament of an electric bulb, because –
Correct : D. It has a very high melting point
90. What is the wavelength of visible spectrum?
Correct : B. 3900 A° - 7600 A°
91. The shape of our Milky Way galaxy is
Correct : C. spiral
92. The different colours of different stars are due to the variation of –
Correct : A. temperature
93. "Tice splitting of different colours of light in a prism is :
Correct : B. Dispersion light
94. A boat will submerge when it displaces water equal to its own:
Correct : B. weight
95. Anemometer is used to measure –
Correct : B. wind velocity
96. The device used for locating submerged objects under sea is –
Correct : A. sonar
97. The working principle of a 'Washing machine' is :
Correct : A. centrifugation
98. Instrument used to measure the force and velocity of the wind is –
Correct : B. Anemometer
99. Who measured the velocity of light first?
Correct : C. Romer
100. Heat from the sun reaches earth by the process of –