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A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by:
 
1. 2Mg
2. 2mg
3. g(M+m)2+m2
4. g(M+m)2+M2

Subtopic:  Tension & Normal Reaction |
 54%
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A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration 

1. 0

2. g/4

3. g/2

4. –g/2

Subtopic:  Application of Laws |
 52%
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A block B is placed on top of block A. The mass of block B is less than the mass of block A. Friction exists between the blocks, whereas the ground on which block A is placed is assumed to be smooth. A horizontal force F, increasing linearly with time begins to act on B. The acceleration aA and aB of blocks A and B respectively are plotted against t. The correctly plotted graph is:

1. 2.
3. 4.
Subtopic:  Friction |
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The force-time (Ft) curve of a particle executing linear motion is as shown in the figure. The momentum acquired by the particle in time interval from zero to 8 second will be 

1. – 2 N-s

2. + 4 N-s

3. 6 N-s

4. Zero

Subtopic:  Newton's Laws |
 79%
From NCERT
PMT - 1989
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A body of 2 kg has an initial speed 5ms–1. A force acts on it for some time in the direction of motion. The force time graph is shown in figure. The final speed of the body.

1. 9.25 ms–1

2. 5 ms–1

3. 14.25 ms–1

4. 4.25 ms–1

Subtopic:  Newton's Laws |
 72%
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A particle of mass m, initially at rest, is acted upon by a variable force F for a brief interval of time T. It begins to move with a velocity u after the force stops acting. F is shown in the graph as a function of time. The curve is an ellipse.

1. u=πF202m

2. u=πT28m

3. u=πF0T4m

4. u=F0T2m

Subtopic:  Newton's Laws |
 57%
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A body of mass 3kg is acted upon by a force which varies as shown in the graph below. The momentum acquired is given by

1. Zero

2. 5 N-s

3. 30 N-s

4. 50 N-s

Subtopic:  Newton's Laws |
 83%
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The variation of momentum with the time of one of the bodies in a two-body collision is shown in fig. The instantaneous force is the maximum corresponding to the point:
             
1. P
2. Q
3. R
4. S

Subtopic:  Newton's Laws |
 70%
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Figures I, II, III and IV depict variation of force with time.

(I)
(II)
(III)
(IV)

The impulse is highest in the case of situations depicted. Figure

1. I and II

2. III and I

3. III and IV

4. IV only

Subtopic:  Newton's Laws |
 74%
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The masses of 10 kg and 20 kg respectively are connected by a massless spring as shown in figure. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has acceleration 12 m/sec2. What is the acceleration of 20 kg mass?

1. 12 m/sec2

2. 4 m/sec2

3. 10 m/sec2

4. Zero

Subtopic:  Spring Force |
 77%
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