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251.

In case of a beam subjected to pure bending

A.	the stress intensity in any fibre is uniform	B.	the nature of stress in any fibre is identical
C.	the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis	D.	the stress intensity in any fibre is proportional to the distance of the fibre from the load carrying end

252.

If the positive and negative shear force diagram areas are not equal, it can be concluded that

A.	shear force diagram has been wrongly drawn	B.	there are at least two maxima for bending moment
C.	bending moment does not change sign	D.	there is at least one couple acting on the beam

253.

A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s?

A.	7	B.	6
C.	5	D.	3

254.

In a tug of war, five men pull a rope to the left at A and six moen pull the rope at B. A weight of 5 kg is hung vertically from the centre of the rope. In order that the rope AB be horizontal

A.	at least one man on side B should be removed	B.	the force applied on A must be equal to that on B
C.	the force required on A must not be equal to that on B	D.	infinite force will be required to be applied at both ends

255.

Using force, length and time as fundamental quantities, the dimensions of mass would be

A.	FL-1T+2	B.	FL-2T+1
C.	FL-2T+2	D.	FL-1T+1

256.

In a single threaded worm and worm wheel the number of teeth on the worm wheel is 80. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be

A.	45	B.	60
C.	90	D.	120

257.

A body is pushed with a force of 10 N for 0.5 second. The impulse given to the body is

A.	5 Ns	B.	2.5 Ns
C.	3.5 Ns	D.	50 Ns

258.

A block slides down a frictionless incline making an angle ? with an elevator floor. The acceleration relative to the incline will be maximum when

A.	the elevator descends at constant speed v	B.	the elevator ascends at constant speed v
C.	the elevator descends with acceleration a	D.	elevator descends with deceleration a

259.

If you want to stop the car in the shortest distance on an icy road, you should

A.	push hard the brakes to lock the wheels	B.	push just hard enough to prevent slipping
C.	pump' the brakes	D.	not apply the brakes

260.

The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if

A.	the slides with an acceleration of 15 m/s2	B.	the acceleration is 3.1 m/s2
C.	the acceleration is 1.2 m/s2	D.	the acceleration is 7.5 m/s2