999+ Physics Questions Answers Explanation MCQ

Q:

The formation of frost on cooling coils in a refrigerator

A) Increases heat transfer	B) Improves C.O.P. of the system
C) Increases power consumption	D) Reduces power consumption

Answer & Explanation Answer: C) Increases power consumption

Explanation:

The formation of frost on cooling coils in a refrigerator Increases power consumption.

The_formation_of_frost_on_cooling_coils_in_a_refrigerator1593770992.jpg image

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Q:

Which of these is not a simple machine?

A) a pair of scissors	B) a lever
C) a ramp	D) the pulley

Answer & Explanation Answer: A) a pair of scissors

Explanation:

Any of the basic mechanical devices for applying a force are called simple machines.

There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. Several of these simple machines are related to each other. But, each has a specific purpose in the world of doing work.

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Q:

Which results in an increase in power?

A) doing more work in less time.	B) doing less work in more time.
C) doing less work in less time.	D) doing more work in more time.

Answer & Explanation Answer: A) doing more work in less time.

Explanation:

Doing more work in less time, results in an increase in power to do a work.

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Q:

Which law is also called law of inertia ?

A) Newton first law	B) Newton second law
C) Newton third law	D) All of above

Answer & Explanation Answer: A) Newton first law

Explanation:

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Q:

A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

A) decreasing the radius of the capillary tube	B) increasing the radius of the capillary tube
C) increasing the height of water in the vessel	D) None of these

Answer & Explanation Answer: A) decreasing the radius of the capillary tube

Explanation:

The water rise in a capillary tube dipped in water is such that the weight of water in the tube above the surface of water in the vessel is equal to the upward force due to surface tension. So it is clear that if the bore to the tube is decreased , the height of the water column in it must be greater.

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Q:

A cyclist leans inwards when he is negotiating a curve so that

A) he may increase his speed	B) his weight may be reduced
C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.	D) no frictional force may be produced between the wheels and the axle

Answer & Explanation Answer: C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

Explanation:

No circular or curved motion is possible without providing the necessary centripetal force. (C) provides this and so is the answer.

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Q:

What are the particles emitted by radio active element after 3 consequtive disintegrations?

A) 2 alpha 1 beta	B) 1 alpha 1 beta
C) 2 beta 1 alpha	D) 2 beta 2 alpha

Answer & Explanation Answer: C) 2 beta 1 alpha

Explanation:

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Q:

Earlist thermometerr was developed by

A) Celsius	B) Fahrenheit
C) Kelvin	D) Galileo

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