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141.

A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly

A.	2 N	B.	2.5 N
C.	3 N	D.	4.5 N
E.	4.9 N

142.

The main advantage of using worm gears is

A.	Low power loss	B.	High velocity ratio
C.	Ease of manufacture	D.	Minimum cost
E.	All of the above

143.

The standard angle between the sides of a V-belt is

A.	25?	B.	30?
C.	40?	D.	45?
E.	55?

144.

A block slides down a smooth inclined plane when released from the top while another falls freely from the same point. The value of which parameter in the two cases will be identical?

A.	Velocity while touching the ground	B.	Kinetic energy at the ground
C.	Kinetic energy after one second	D.	Momentum at the ground
E.	Time taken to reach the ground

145.

The principle of conservation of energy cannot be applied in case of

A.	Simple pendulum	B.	A particle moving in gravitational field
C.	Flow of heat through a metal	D.	Ideal flow of water in a pipe
E.	Sliding of a particle along inclined plane with friction

146.

Which of the following pair will have identical dimensions?

A.	Pressure and surface tension	B.	Work and kinetic energy
C.	Momentum and force	D.	Moment of inertia and angular momentum
E.	None of the above

147.

The value of acceleration due to gravity is 980 cm/sec2. Its value in meter per (hour)2 will be

A.	127	B.	1270
C.	1.27 x 108	D.	1.27 x 107
E.	1270000

148.

Which of the following is dimensionless?

A.	Specific speed	B.	Specific volume
C.	Specific gravity	D.	Specific weight
E.	None of the above

149.

A solid spherical ball rolls on a table. The momen' of inertia of the ball is given by 3/5 x mass x radius2. The ratio of translational and rotational kinetic energies for ball will be

A.	1	B.	2
C.	5?3	D.	7?8
E.	7?16

150.

Plastic collosion of two bodies of equal mass results in a common velocity after impact which is

A.	Sum of their initial velocities	B.	Difference of their initial velocities
C.	Average of their initial velocities	D.	Independent of their initial velocities
E.	None of the above