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151.

The maximum efficiency of a scres jack having square threads and friction angle of 30 degree will be

A.	9%	B.	11%
C.	20%	D.	33%
E.	5%

152.

A rocket is fired vertically from the ground with a resultant vertical acceleration of 10 m/sec the fuel is finished in one minute and it continues to move up. The maximum height reached will be

A.	2 km	B.	10 km
C.	20 km	D.	36 km
E.	80 km

153.

The locus of a point on a thread unwound from a cylinder will be

A.	A straight line	B.	A circle
C.	An involute	D.	A spiral
E.	A cycloid

154.

If air resistance is neglected, at the mid-point of its swing, the acceleration of the bob of a simple pendulum along its path is always

A.	Zero	B.	A minimum but not equal to zero
C.	Increasing	D.	Decreasing

155.

A body is executing simple harmonic motion of amplitude 1 cm. Its velocitywhile passing through the central point is 10 mm/sec. Its frequency will be

A.	1 rps	B.	1.59 rps
C.	1.77 rps	D.	2.22 rps
E.	2.99 rps

156.

A couple applied to a flywheel of mass 5 kg and of radius of gyration 20 cm produces an angular acceleration of 4 radians/sec2. The torque applied in dyne cm is

A.	8 x 104	B.	8 x 106
C.	8 x 107	D.	8 x 108
E.	8 x 1010

157.

For perfectly elastic bodies the value of the coefficient of restitution is

A.	Zero	B.	0.25
C.	0.5	D.	0.707
E.	1

158.

A cube of wood supporting 200 gm mass just floats in water. When the mass is removed, the cube rises by 2 cm the side of the cube will be

A.	5 cm	B.	10 cm
C.	12.5 cm	D.	15 cm
E.	20 cm

159.

In the speed of rotation of earth decreases, the weight of the body will

A.	Increase	B.	Decrease
C.	Remain unaltered	D.	Depends on speed ratio
E.	Cannot be ascertained on the basis the information given

160.

The excape velocity on the surface of the earth is

A.	1 km/s	B.	2.2 km/s
C.	4.4 km/s	D.	5.6 km/s
E.	11.2 km/s