# WBCS Questions and Answers on General Science (Physics) P8

Page 8

147771. Light-year is a unit of
A
Light
B
Intensity of light
C
Time
D
Distance.
D
Explanation: The light-year is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (9.46×1012 km) or 5.88 trillion miles.
155972. Hubble is a
A
Space telescope
B
Star
C
Nuclear weapon
D
Musical instrument
A
255973. Which of the following is used in the preparation of nuclear bombs?
A
zirconium
B
uranium
C
molybdenum
D
B
A
Ultraviolet rays
B
Infra-red rays
C
X-rays
D
γ-rays (Gamma Rays
D
Correct Answer: D. γ-rays (Gamma Rays
148075. A clear piece of glass immersed in glycerol cannot be seen separately because the comparison to the refractive index of glycerol, the refractive index of glass is
A
Nearly equal
B
This does not depend on the refractive index
C
Greater
D
Lesser.
A
151076. When white light is passed through a glass prism, which of the following colors is refracted the most?
A
Orange
B
Violet
C
Blue
D
Red
B
255377. Which one of the following is not the unit of heat?
A
calorie
B
kilocalorie
C
kilojoule
D
watt
D
158978. A. C is converted to D.C. by
A
Transformer
B
Motor
C
Rectifier
D
Dynamo
C
152579. If the density of air is 1.30 g/lit., what is the volume occupied by 7.8 g of air?
A
6.5 lit.
B
10.10 lit.
C
10 lit.
D
6 lit
D
160380. The reaction that occurs in nuclear reactors is
A
Nuclear fission
B
Nuclear isomerization
C
Nuclear fusion
D
Spallation
A