Question

Match the Column I with Column II and mark the correct choice from the codes given below

Column I		Column II
(i)	When a body does work against friction, its kinetic energy	(p)	Independent of time
(ii)	Work done by a body is	(q)	Time
(iii)	Power of a body varies inversely as	(r)	Force must be inversely as conservative
(iv)	When work done over a closed path is zero	(s)	Decreases

• A. i—p, ii—q, iii—r, iv—s
• B. i—r, ii—p, iii—q, iv—s
• C. i—s, ii—q, iii—p, iv—r
• D. i—s, ii—p, iii—q, iv—r

Answer 1

Answer: (D)

When a body does some work against friction, its kinetic energy decreases.
(i) -s
Work done by a body is independent of time.
(ii) $-p$
Power of a body $(p=W/t)$ varies inversely as time.
(iii) - q
When work done over a closed path in zero, force must be conservative.
(iv) $-r$