General Knowledge

Physics - Section 1

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Physics - Section 1

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Question 11
Stars which appear single to the naked eye but are double when seen through a telescope are

A
novas and supernovas
B
binaries
C
asteroids
D
quasars
Correct Answer: Option B

No answer description available for this question.

Question 12
ML2T-2 is the dimensional formula for

A
moment of inertia
B
pressure
C
elasticity
D
couple acting on a body
Correct Answer: Option D

No answer description available for this question.

Question 13
Light travels at the fastest speed in

A
glass
B
water
C
hydrogen
D
vacuum
Correct Answer: Option D

No answer description available for this question.

Question 14
Railway tracks are banked on curves

A
necessary centrifugal force may be obtained from the horizontal component weight of the train
B
to avoid frictional force between the tracks and wheels
C
necessary centripetal force may be obtained from the horizontal component of the weight of the train
D
the train may not fly off in the opposite direction
Correct Answer: Option C

No answer description available for this question.

Question 15
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

A
metals have higher thermal capacity than plastics
B
plastics have a lower density than metals
C
metals are good conductor of heat
D
plastics have a higher thermal conductivity than metals
Correct Answer: Option C

No answer description available for this question.

Question 16
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

A
1.8 km, 0.15 km
B
2.2 km, 0.20 km
C
2.8 km, 0.25 km
D
3.3 km, 0.30 km
Correct Answer: Option D

No answer description available for this question.

Question 17
Intensity of sound at a point is ____ its distance from the source.

A
directly proportional to
B
inversely proportional to
C
directly proportional to square of
D
inversely proportional to square of
Correct Answer: Option D

No answer description available for this question.

Question 18
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

A
at sea level
B
at the top of Mt. Everest
C
at a place in a valley below sea level
D
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
Correct Answer: Option C

No answer description available for this question.

Question 19
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

A
mercury is a metal
B
density of mercury is greater than that of water
C
cohesion of mercury is greater than its adhesion with glass
D
cohesion of water is greater than its adhesion with glass
Correct Answer: Option C

No answer description available for this question.

Question 20
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

A
1200 m
B
0.33 km
C
3.33 km
D
33 km
Correct Answer: Option C

No answer description available for this question.

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