Engineering :: Engineering Mechanics

@ : Home > Civil Engineering > Engineering Mechanics

221.

The loss of kinetic energy during elastic impact is zero.

Agree

Disagree

222.

The loss of kinetic energy due to direct impact of two bodies

depends

does not depend

223.

Which of the following statement is correct?

A.	The kinetic egergy of a body during impact remains constant.	B.	The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact.
C.	The kinetic energy of a body before impact is less than the kinetic energy of a body after impact.	D.	The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.

224.

When two elastic bodies collide with each other,

A.	the two bodies will momentarily come to rest after collision	B.	the two bodies tend to compress and deform at the surface of contact
C.	the two bodies begin to regain their original shape	D.	all of the above

225.

Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity

A.	v	B.	v / 2
C.	v / 4	D.	v / 8

226.

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following :

A.	both the balls undergo an equal change in momentum	B.	the change in momentum suffered by rubber ball is more than the lead balf
C.	the change in momentum suffered by rubber ball is less than the lead ball	D.	none of the above

227.

A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

A.	v	B.	2 v
C.	4 v	D.	8 v

228.

A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

A.	1 m	B.	2 m
C.	3 m	D.	4 m

229.

Whenever a force acts on a body and the body undergoes a displacement, then

A.	work is said to be done	B.	power is being transmitted
C.	body has kinetic energy of translation	D.	none of these

230.

The unit of work in S.I. units is

A.	newton	B.	erg
C.	kg-m	D.	joule