## Wednesday, April 24, 2019 # WBCS General Knowledge on General Science (Physics) P3

Page 3

153021. If the length and cross-section of a Wire are both doubled, the resistance will
A
Increase twice
B
Remain unchanged
C
Increase 4 times
D
Decrease 5 times
B
158322. A magnifying glass or a simple microscope produces a
A
Magnified virtual image.
B
Diminished virtual image.
C
Magnified real image.
D
Virtual image near the eye, having the same size as the object
A
Correct Answer: A. Magnified virtual image.
255723. Which is not renewable resource?
A
energy of water
B
energy of sun
C
energy of earth
D
none of the above
D
Correct Answer: D. none of the above
151824. Two ends of a tube are closed by corks so that the tube become airtight. The pressure of air inside the closed tube is
A
Equal to the atmospheric pressure.
B
Dependent on the length of the tube.
C
Very small.
D
Slightly less than the atmospheric pressure
A
Correct Answer: A. Equal to the atmospheric pressure.
254625. What is the audible range [hearing range] of humans?
A
20 Hz 20000 Hz
B
80 Hz 100Hz
C
2 lac Hz 4 lac Hz
D
0 Hz 20 Hz
A
Correct Answer: A. 20 Hz 20000 Hz
147826. A watch based on an oscillating spring is taken from the earth to the moon. It will -
A
Give the same time
B
Stop altogether
C
Run slow
D
Run fast.
C
146827. A piece of a metal plate with a circular hole is heated. If the metal plate expands on heating, the diameter of the hole will
A
Increase or decrease depending on the diameter of the hole.
B
Increase or decrease depending upon the metering of the plate
C
increase
D
Decrease.
C
157928. The current on a 100W, 200V electric bulb is
A
0.5 amp
B
22000 amp
C
2.2 amp
D
2.3 amp
A
155629. Basically domestic electric wiring is a
A
Combination of series and parallel connections.
B
Series connection
C
Parallel connection
D
None of the above
C
152130. Mass of a body is defined by the following quantity
A
Applied force / acceleration
B
Applied force / increase in momentum
C
Velocity / acceleration
D
Applied force / velocity
A
Correct Answer: A. Applied force / acceleration