# Quiz on General Science (Physics) For WBCS Prelims Exams P4

Page 4

158631. The blue color of the sky is due to
A
Reflection
B
Dispersal
C
Scattering
D
Refraction
C
150432. The temperature at which Celsius and Fahrenheit's scales give the same reading is
A
- 40°C
B
40°C
C
0°C
D
32°C.
A
152433. Two bales at the same temperature collide. What is conserved?
A
Linear momentum
B
Kinetic energy
C
Temperature
D
Velocity
A
255134. Sound waves travel fastest in
A
solids
B
liquids
C
gases
D
vacuum
A
148835. The weight of an iron ball on earth is 12 kg-wt. Its weight on the moon will be
A
12 kg-wt
B
2 kg-wt
C
18 kg-wt
D
9 kg-wt
B
159836. Magnetism at the center of a bar magnet is
A
Zero
B
Maximum
C
Minimum
D
Minimum or maximum
A
160837. A radioactive isotope has a half-life period of 3 days. After how many days I gm of it will change to 0.125 gm?
A
6 days
B
12 day
C
24 days
D
9 days
D
150738. Select the best response: One should wear a colored dress in winter because
A
They absorb heat
B
it is easy to wash them
C
They look colorful
D
They are cheaper
A
Correct Answer: A. They absorb heat
156839. At what temperature, the mass of pure water of volume 1 cubic centimeter is 1 gm?
A
4°C
B
9°C
C
0°C
D
3°C
A
154040. Solar energy is due to
A
Nuclear fission reaction
B
Chemical reaction
C
Nuclear fusion reaction
D
Burning of H2O
C
Correct Answer: C. Nuclear fusion reaction