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111.

A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is

A.	i + j + k	B.	Zero
C.	2i + 3j	D.	i - j - k
E.	i + j

112.

The law of conservation of mechanical energy is valid

A.	Irrespective of the nature of force field	B.	Only in gravitational field
C.	Only if the total work done by the particle in moving around in a closed trajectory is zero	D.	Only if the force is tangential to the trajectory
E.	None of the above

113.

In the impact problems the following conditions must always be satisfied:

A.	The total kinetic energy remains unchanged	B.	The total linear momentum remains unchanged
C.	The magnitude of the total linear momentum is multiplied by the coefficient of restitution	D.	The kinetic energy of the system is reduced by a factor proportional to the coefficient of restitution
E.	None of the above

114.

The centroid of the area between the circle x2 + y2 = 16 and the line x + y = 4 will have the coordinates

A.	(4, 2)	B.	(2, 4)
C.	(2.34, 2.34)	D.	(1.16, 1.16)

115.

A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is

A.	Proportional to the coefficient of static friction	B.	Proportional to the coefficient of dynamic friction
C.	Indeterminate	D.	Determinate but depends on the acceleration of the cylinder

116.

A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be

A.	3000	B.	1500
C.	1000	D.	500
E.	250

117.

The gravitational field at the surface of the moon is one sixth of that at the surface of the earth. A 72 kg man weighs on the surface of the moon

A.	72 N	B.	117.7 N
C.	420 N	D.	137.7 N

118.

The weight of an object will be maximum when it is placed at

A.	North pole	B.	South pole
C.	Equator	D.	Centre of earth
E.	Any of the above loctions

119.

The coefficient of static friction will have the highest value in case of

A.	Mild steel and mild steel	B.	Mild steel and copper
C.	Cast iron and steel	D.	Rope and wood

120.

Which of the following is an example of a projectile?

A.	Launching of a satellite	B.	Taking off of an aircraft
C.	Lifting of a balloon	D.	Throwing of a cricket ball by a player
E.	None of the above