## Wednesday, April 24, 2019 # WBCS Previous Years MCQs on General Science (Physics) P7

Page 7

A
Locating geostationary satellites.
B
detecting and locating the position of objects such as an airplane.
C
locating submerged submarines.
D
B
Correct Answer: B. detecting and locating the position of objects such as an airplane.
157662. Absolute zero temperature is that temperature where
A
All matter stays in the solid state.
B
Kinetic and potential energies of molecules become equal to each other.
C
Water freezes to ice.
D
All molecules of matter come to rest
D
Correct Answer: D. All molecules of matter come to rest
153963. Electrical energy is converted into mechanical energy by a
A
Dynamo
B
Rectifier
C
Thermostat
D
Motor
D
149164. A ball is dropped from a given height. If its collision with the ground is fully elastic, it will reach a height
A
More than before
B
Less than before
C
Height will not depend on an elasticity
D
Same as before
D
Correct Answer: D. Same as before
146665. Among the following select the odd one
A
Acre
B
Mile
C
Metre
D
Furlong.
A
150266. The periodic time of a Pendulum depends on
A
The shape of its Bob
B
The volume of its Bob
C
The density of its Bob
D
Its length.
D
154267. The value of acceleration due to gravity at higher altitudes
A
Remains constant
B
Increases
C
Decreases
D
None of the above
C
157868. A person is moving towards a plane mirror with a speed of 1 m / sec. The image will approach the moving person will relative speed
A
2 m/sec.
B
3 m/sec.
C
1.5 m/sec.
D
1 m /sec
A
154369. The atmospheric layers which reflect radio waves are called
A
Stratosphere
B
Troposphere
C
Exosphere
D
Ionosphere
D
150670. With an ordinary balance, we measure
A
Weight
B
Density
C
Volume
D
Mass
D