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16 . During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.
 A. equal to B. equal and opposite to C. less than D. greater than

17 . Work done is said to be zero, when
 A. some force acts on a body, but displacement is zero B. no force acts on a body but some displacement takes place C. either (a) or (b) D. none of the above

18 . One watt is equal to
 A. 0.1 joule/s B. 1 joule/s C. 10 joules/s D. 100 joules/s

19 . two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are
 A. 15 N and 5 N B. 20 N and 5 N C. 15 N and 15 N D. none of these

20 . Strain energy is the
 A. energy stored in a body when strained within elastic limits B. energy stored in a body when strained upto the breaking of a specimen C. maximum strain energy which can be stored in a body D. proof resilience per unit volume of a material

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