Assertion: The work done by an external unbalanced force during a round trip is not zero.
Reason : No force is required to move a body in its round trip.
a.
Both assertion and reason are true and reason is the correct explanation of assertion.
b.
Both assertion and reason are true but reason is not the correct explanation of assertion.
c.
Assertion is true but reason is false.
d.
Both Assertion and Reason are false
Solution,
Thus, the Assertion, "The work done by an external unbalanced force during a round trip is not zero." is TRUE.
However, there is a force acting on a body in its round trip since starts from a point and ends its journey to that point. So, the body accelerates and decelerates and hence, force can't be 0.
Hence,
The reason, "No force is required to move a body in its round trip." is FALSE.
Ans (C)
Thus, the Assertion, "The work done by an external unbalanced force during a round trip is not zero." is TRUE.
However, there is a force acting on a body in its round trip since starts from a point and ends its journey to that point. So, the body accelerates and decelerates and hence, force can't be 0.
Hence,
The reason, "No force is required to move a body in its round trip." is FALSE.
Ans (C)