Mechanical Engineering :: Questions and Answers
Mechanical Engineering :: Engineering-Mechanics
44. If two blocks of equal mass are attached to the two ends of a light string and one of the blocks is
placed over a smooth horizontal plane while the other is hung freely after passing over a smooth pulley,
then the two blocks will have some motion.
A. Agree B. Disagree
View Answer
Answer :: A
Explanation::
45. 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
View Answer
Answer :: B
Explanation::
46. 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
View Answer
Answer :: C
Explanation::
47. The force which acts along the radius of a circle and directed away from the centre of
the circle is called centrifugal force.
A. Agree B. Disagree
View Answer
Answer :: A
Explanation::
48. One watt is equal to
A. 0.1 joule/s
B. 1 joule/s
C. 10 joules/s
D. 100 joules/s
View Answer
Answer :: B
Explanation::
49. 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
View Answer
Answer :: A
Explanation::
50. If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum
of body having mass m1 is __________ the momentum of body having mass m2.
A. equal to
B. less than
C. greater than
View Answer 
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