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121.

Ice is slippery when a man walks on it because

A.	Its surface is smooth	B.	There is no friction
C.	It is very chill	D.	Increase of pressure causes it to melt
E.	Ice is brittle

122.

A satellite orbits around the earth due to

A.	Celestial force	B.	Gravitational force
C.	Centrifugal force	D.	Centripetal force
E.	All of the above

123.

A cylindrical bar 10 metres long elongates 0.1 mm under a load. The strain in the material of the bar will be

A.	10--4	B.	10--5
C.	10--7

124.

Given that the area of a figure varies as square of mean ordinate. The area of the figure is 154 sq. cm when the mean ordinate is 7 cm. The area of the figure when mean ordinate is 10.5 cm will be

A.	346.5 cm	B.	364.5 cm
C.	356.3 cm	D.	364.9 cm
E.	360.6 cm

125.

A dash pot consists of a cylinder 10 cm in diameter in which slides a piston 12 cm long having a radial clearance of 1 mm. The cylinder is filled with oil having a viscosity of 1 poise. What will be the resistance offered by the piston to sliding with a velocity of 3 cm/sec

A.	10 kg	B.	50 kg
C.	100 kg	D.	1090 kg
E.	10900 kg

126.

A body is vibrating with simple harmonic motion of aplitude 5 cm frequency 10 vibrations per second. The maximum value of velocity in cm/s will be

A.	3.14 cm/s	B.	31.4 cm/s
C.	314 cm/s	D.	3140 cm/s
E.	31400 cm/s

127.

A piece of wetted wood just floats in water. When placed in an oil of specific gravity 0.75, it will

A.	Float with 3/4 of volume above the liquid surface	B.	Float with upside down
C.	Float for sometime and then sink	D.	Sink
E.	Float with 1/4 of volume above the liquid level

128.

A 3.2 m diameter balloon is filled with Helium. The total weight of balloon, gas and pay load is 10 kg kg. In an isothermal atmosphere having conditions identical to N.T.P. the balloon will rise to a height of about

A.	1000 m	B.	1500 m
C.	2000 m	D.	3000 m
E.	6000 m

129.

The moment of inertia of a body does not depend upon

A.	The angular velocity of the body	B.	Mass of the body
C.	The distribution of mass in the body	D.	The axis of rotation of the body
E.	None of the above

130.

An iron sphere of mass 30 kg and an aluminium sphere of mass 10 kg, both having the same diameter are dropped vertically from a cliff. When they are 10 metrs from the ground, they have identical

A.	Accelerations	B.	Momenta
C.	Kinetic energies	D.	Potential energies
E.	All of the above