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211.

The amount by which the outer edge of the rail is raised, is known as super-elevation.

Agree

Disagree

212.

In railways, the super-elevation is expressed in terms of the difference of level between the two rails.

True

False

213.

The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is

less than

greater than

214.

The total momentum of a system of masses (i.e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

A.	Newton's first law of motion	B.	Newton's second law of motion
C.	principle of conservation of energy	D.	principle of conservation of momentum

215.

The bodies which rebound after impact are called

A.	inelastic bodies	B.	elastic bodies
C.	neither elastic nor inelastic bodies	D.	none of these

216.

The impact between two lead spheres is approximately equal to an

elastic

inelastic

217.

In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.

True

False

218.

The coefficient of restitution for inelastic bodies is

A.	zero	B.	one
C.	between zero and one	D.	more than one

219.

The coefficient of restitution for elastic bodies is one

Right

Wrong

220.

During elastic impact, the relative velocity of the two bodies after impact is

A.	equal to	B.	equal and opposite to
C.	less than	D.	greater than