# Given below are two statements:  Assertion (A): According to the law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy. Reason (R): Mechanical energy is not a conserved quantity.   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:  Conservation of Mechanical Energy |
80%
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Given below are two statements:
 Assertion (A): When a stationary bomb explodes into two pieces, their speeds are in the inverse ratio of their masses. Reason (R): The explosion does not violate the law of conservation of linear momentum.

 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 |
70%
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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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