We have collected important Physics one liner questions and answers. These physics general questions are frequently asked in many competative exams, you should go through it.
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Q 121.
What is the Number of basic SI unit ?
Ans.
7
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Q 122.
Why is the density of sea water increases ?
Ans.
depth and salinity increase.
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Q 123.
If an apple is released from an orbiting spaceship,it will fall ?
Ans.
move along with the spaceship at the same speed.
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Q 124.
What is the period of revolution of a geostationary satellite ?
Ans.
24 hours.
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Q 125.
A person climbing a hill bends forward in order to ?
Ans.
Increase stability.
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Q 126.
What is conservation of energy ?
Ans.
Energy can neither be created nor destroyed.
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Q 127.
When the speed of a body is doubled, its kinetic energy becomes ?
Ans.
Half.
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Q 128.
What is the work done in holding a weight of 20 kg at a height of 1 m above the ground is ?
Ans.
Zero.
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Q 129.
A sheet of paper can be pulled out quickly from under a glass of water without spilling the water. This phenomenon is a example ?
Ans.
Inertia.
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Q 130.
A ball tied with a string to a rotating shaft revolves at uniform speed. As a shaft is suddenly brought to rest the string starts getting round the shaft with the angular velocity of the ball ?
Ans.
Increasing.
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Q 131.
Why it is easier to roll a barrel than to pull it ?
Ans.
Because rolling friction is much less than sliding friction.
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Q 132.
Why a person finds it more difficult to walk on ice than on a concrete road ?
Ans.
Because the friction between the ice and the feet is less than, that between the concrete and the feet.
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Q 133.
If a body is taken from the earth to the moon ?
Ans.
Its mass will remain the same but weight will be different.
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Q 134.
Why is a person weighs more in a lift ?
Ans.
Because of its acceleration upward.
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Q 135.
Why is a body weighs slightly more at the poles than at the equator ?
Ans.
Because mass is constant and weight is change according to the place.
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Q 136.
When is the weight of a body is minimum ?
Ans.
At the equator.
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Q 137.
When is the weight of a body is maximum ?
Ans.
At the poles.
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Q 138.
Why the mass of a body is different from its weight ?
Ans.
Because mass is a measure of the quantity of matter whereas weight is a force.
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Q 139.
The gravitational force with which the sun attracts the earth ?
Ans.
Is the same as the force with which the earth attracts the sun.
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Q 140.
Who propounded the universal law of gravitation ?
Ans.
Newton.
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