# Given below are two statements:  Assertion (A): Work done by friction on a body sliding down an inclined plane is negative. Reason (R): Work done is less than zero if the angle between force and displacement is acute or both are in the same direction.    1. Both (A) and (R) are True and (R) is the correct explanation of (A). 2. Both (A) and (R) are True but (R) is not the correct explanation of (A). 3. (A) is True but (R) is False. 4. Both (A) and (R) are False.

Subtopic:  Concept of Work |
76%
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Given below are two statements:
 Assertion (A): The work done on bringing a body down from the top to the base along a frictionless inclined plane is the same as the work done in bringing it down the vertical side. Reason (R): The gravitational force on the body along the inclined plane is the same as that along the vertical side.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Work done by constant force |
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Given below are two statements:
 Assertion (A): No work is done when an electron completes a circular orbit around the nucleus of an atom. Reason (R): Work done by a centripetal force is always zero.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic:  Concept of Work |
81%
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Given below are two statements:
 Assertion (A): Centripetal force does no work. Reason (R): Force and displacement are perpendicular to each other.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic:  Concept of Work |
84%
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Given below are two statements:
 Assertion (A): Work done in uniform circular motion is zero. Reason (R): Force is always directed along displacement.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic:  Concept of Work |
71%
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Given below are two statements:
 Assertion (A): In an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of collision of the balls (i.e. when they are in contact). Reason (R): Energy spent against friction does not follow the law of conservation of energy.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Collisions |
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Given below are two statements:
 Assertion (A): In an elastic collision between two bodies, the energy of each body is conserved. Reason (R): The total energy of an isolated system is conserved.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.

Subtopic:  Collisions |
57%
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Given below are two statements:
 Assertion (A): Frictional forces are conservative forces. Reason (R): Potential energy can be associated with frictional forces.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic:  Potential Energy: Relation with Force |
86%
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Given below are two statements:
 Assertion (A): Work is energy transferred to or from an object by means of force acting on the object. Reason (R): If energy is transferred to the object, the work is positive and if the energy is transferred from the object, the work is negative work.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic:  Work Energy Theorem |
56%
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Given below are two statements:
 Assertion (A): For a closed isolated system during a collision, the linear momentum of each colliding body may change but the total linear momentum of the system cannot change, whether the collision is elastic or inelastic. Reason (R): Total mechanical energy is conserved, in the elastic collision.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic:  Collisions |
69%
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