81. Which one of the particles, claimed to have been discovered, can put Albert Einstein's theory of relativity to the risk of being proved wrong?
Microwave photons
Neutrinos
Liquid crystal
Light-emitting diodes
82. A fluorescent tube is preferred to an electric bulb because
it has a larger light-emitting surface.
voltage fluctuations do not affect it.
in a tube, electrical energy is almost fully converted into light.
None of the above.
83. The inexhaustible source of energy of the stars is due to
conversion of Hydrogen to Helium.
conversion of Helium to Hydrogen.
decay of radioactive elements.
excess of oxygen that helps burning and release of energy.
84. The Leaning Tower of Pisa does not fall because
it is tappered at the top.
it covers a large base area.
its centre of gravity remains at the lowest position.
the vertical line through the centre of gravity of the tower falls within the base.
85. Of the two bulbs in a house, one glows brighter than the other. Which of the following statements is correct?
The brightness does not depend on resistance.
Both the bulbs have the same resistance.
The brighter bulb has larger resistance.
The dimmer bulb has larger resistance.
86. One Kilowatt-hour equals
3.6 x 106J
3.6x103J
103J
105J
87. If an apple is released from an orbiting spaceship, it will
fall towards the Earth
move at a lower speed
move along with the spaceship at the same speed
move at a higher speed
88. The atmosphere exerts enormous pressure on us. But we do not feel it because
our blood exerts a pressure slightly more than that of atmosphere.
we are used to it.
our bones are very strong and can withstand the pressure.
the surface area of our head is very small.
89. Hydrogen bomb is based on the principle of
controlled fusion reaction
uncontrolled fusion reaction
controlled fission reaction
uncontrolled fission reaction
90. “Endoscope” used by doctors for examining the inside of the patient's stomach works on the principle of
reflection of light
dispersion of light
total internal reflection of light
refraction of light
91. Consider the following statements: Assertion (A): If ice collects on the freezer, the cooling in the refrigerator is affected adversely. Reason (R): Ice is a poor conductor. Select the correct answer using the codes given below: Codes:
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
92. What type of electromagnetic radiation is used in the remote control of a television?
Infrared
Ultraviolet
Visible
None of these
93. The minimum height of a plane mirror to see the fullsize image of a person is equal to
the height of the person
half the height of the person
one-fourth the height of the person
double the height of the person
94. Which one of the following is used as a moderator in the nuclear reactor?
Thorium
Graphite
Radium
Ordinary water
95. The principle of 'Black hole' was enunciated by
C.V. Raman
H.J. Bhabha
S. Chandrashekhar
H. Khurana
96. Refrigeration helps in food preservation by
killing the germs.
reducing the rate of biochemical reactions.
destroying enzyme action.
sealing the food with a layer of ice.
97. Which mirror is used as a rear view mirror in the vehicles?
Plane
Convex
Concave
Inverted
98. The reason of mirage is
interference of light
diffraction of light
polarisation of light
total internal reflection of light
99. The colour of light is determined by its
amplitude
wavelength
intensity
velocity
100. Ultrasonics are sound waves of frequency
greater than 20,000 Hz
less than 10,000 Hz
equal to 1,000 Hz
None of these
12 Total Test
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Scientifically designed for PCS
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75 Total Test
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69 Total Test
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