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⁞ Physics

General Science ➤ Physics ➤ 2
Question 21
Q21.  The work done by a variable force is given by:
 

Answer :  area under the force curve and the displacement axis


The work done by a variable force is given by the area under the force curve and the displacement axis.

W = Area ABCDA


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Question 22
Q22.  Which of the following is NOT a conservative force?
 

Answer :  Frictional force


A conservative force is a force with the property that the work done in moving a particle between two points is independent of the taken path. Examples: Electrostatic force, Magnetic force, Force in an elastic spring Frictional force is a non-conservative force.


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Question 23
Q23.  What will be the change in the force of attraction between two bodies if the distance between them is doubled?
 

Answer :  Becomes less by four times


If the distance between two masses is doubled, the gravitational attraction between them becomes 1/4 times. F = Gm1m2/r2


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Question 24
Q24.  The acceleration due to gravity on any planet does not depend on which of the following?
 

Answer :  Mass of the object


The value of acceleration due to gravity on any planet depends upon the mass radius and density of planet and it is independent of mass, shape and density of the body placed on the surface of the planet.


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Question 25
Q25.  Which of the following condition will be true for a planet to have atmosphere?
 

Answer :  velocity of molecules in its atmosphere is lesser than escape velocity


A planet will have atmosphere if the velocity of molecule in its atmosphere is lesser than escape velocity. This is why earth has atmosphere while moon has no atmosphere.


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