General Science (Physics) Practice Sets For WBCS Prelims P2

Page 2

155811. Which surface is a good absorber of heat?
A
White smooth surface
B
Black smooth surface
C
White rough surface
D
Black rough surface
D
Correct Answer: D. Black rough surface
255012. Transfer of heat by convection can take place in
A
solids and liquids
B
solids and vacuum
C
gasses and liquids
D
vacuum and gasses
C
Correct Answer: C. gasses and liquids
148713. The immersed portion of a piece of pure ice floating in water is
A
10/11th of its volume.
B
11/12th of its volume
C
8/9th of its volume.
D
9/10th of its volume.
D
Correct Answer: D. 9/10th of its volume.
153114. A solid piece of iron sinks in water but floats in mercury because -
A
the density of iron is more than that of water as well as mercury
B
the density of iron is more than that of water but less than that mercury
C
the average density of water and mercury is less than that of iron
D
the density of iron is less than that of water as well as mercury
B
Correct Answer: B. the density of iron is more than that of water but less than that mercury
157215. The radiant energy from the sun is due to
A
Nuclear fusion
B
Nuclear fission
C
chemical reaction
D
combustion
A
158716. Sound waves in air are
A
Electromagnetic
B
Polarized
C
Transverse
D
Longitudinal
D
148617. Given the Premises (i) A human cannot live without an atmosphere (ii) The moon is without atmosphere Then which of the following conclusions is valid?
A
The man cannot live on the moon
B
There is no life possible on the moon
C
Some men cannot live on the moon
D
All of these.
A
Correct Answer: A. The man cannot live on the moon
154818. The process of joining two or more blocks of ice by pressing each other is called
A
Regelation
B
C
Refrigeration
D
None of the above
A
147619. An ice cube containing a large bubble of air is floating in the water contained in a large breaker. When the ice melts completely, the level of water will
A
Rise
B
First rise and then go down
C
Remain unchanged
D
Go down.
C
151120. A rocket leaves the earth, lands on the moon and returns to earth. It will require the maximum energy to
A
Rise from the moon
B
Land on the earth
C
Rise from the earth
D
Land on the moon
C
Correct Answer: C. Rise from the earth