## Wednesday, April 24, 2019 # General Science Practice Sets for WBCS, SSC, Rail, UPSC Exam P10

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146291. An example of a scalar quantity is
A
Momentum
B
Energy
C
Velocity
D
Force.
B
Explanation:

Energy is an example of a scalar quantity. Because it only has magnitude but has no direction.

Energy = Force * Displacement

Here both force and displacement are vector quantity but its multiplication is a scalar quantity.

A
Yellow light is able to penetrate fog, thus it is able to illuminate the road better in foggy nights.
B
The automobile looks more imposing with yellow headlights.
C
Yellow light consumes less power.
D
Yellow light does not produce a dazzling effect in the eyes of the pedestrians
A
Correct Answer: A. Yellow light is able to penetrate fog, thus it is able to illuminate the road better in foggy nights.
149593. The magnetic length of a bar magnet means
A
It's width
B
Its total length
C
The distance of a pole from the center
D
The distance between its two poles
D
Correct Answer: D. The distance between its two poles
151494. What is increased in the step-up transformer?
A
Wattage
B
Current density
C
Voltage
D
Current
C
156495. The material used for safety from nuclear radiation is
A
Iron
B
C
Copper
D
Platinum
B
148396. When a body is lifted by hand, what type of work is performed by hand?
A
Third type of lever
B
Simple machine
C
First type of lever
D
Second type of lever.
A
Correct Answer: A. Third type of lever
161097. Which of the following is not a conservative force?
A
Electrostatic force.
B
Magnetostatic force.
C
Gravitational force.
D
Frictional force
D
154698. Focussing in a camera is carried out by varying
A
The distance of the lens from the object.
B
The speed of the shutter.
C
The amount of light
D
The distance of the lens from the film
D
Correct Answer: D. The distance of the lens from the film
151799. Greenhouse effect causes
A
lowering in temp. of the earth.
B
continuous snowing on the earth.
C
rise in temperature of the earth.
D
continuous rainfall
C
Correct Answer: C. rise in temperature of the earth.
1569100. The image formed by a plane mirror is
A
virtual and erect
B
real and inverted
C
real and erect
D
virtual and inverted
A
Correct Answer: A. virtual and erect