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A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t - 4), the acceleration of the particle will be given by the equation

A.	3t2-lt	B.	3t2+2t
C.	6f-8	D.	6f-4

A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is

A.	0°	B.	30°
C.	45°	D.	60°

A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A.	remain horizontal	B.	slant up towards direction of pull
C.	slant down towards direction of pull	D.	unpredictable

10.

A single force and a couple acting in the same plane upon a rigid body

A.	balance each other	B.	cannot balance each other
C.	produce moment of a couple	D.	are equivalent

11.

A trolley wire weighs 1.2 kg per metre length. The ends of the wire are attached to two poles 20 metres apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

A.	2.5 cm	B.	3.0 cm
C.	4.0 cm	D.	5.0 cm

12.

According to law of triangle of forces

A.	three forces acting at a point will be in equilibrium	B.	three forces acting at a point can be represented by a triangle, each side being proportional to force
C.	if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equi¬librium	D.	if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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