The pulleys and strings shown in the figure are smooth and of negligible mass. For the system to remain in equilibrium, the angle \(\theta\) should be: 
     
1. \(0^\circ\)
2. \(30^\circ\)
3. \(45^\circ\)
4. \(60^\circ\)

Subtopic:  Tension & Normal Reaction |
 83%
From NCERT
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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. (M+m)2+m2g

4.(M+m)2+M2g

Subtopic:  Tension & Normal Reaction |
 52%
From NCERT
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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 |
From NCERT
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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 |
 69%
From NCERT
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A uniform chain of length L hangs partly from a table which is kept in equilibrium by friction. If the maximum length that can be supported without slipping is l, then the coefficient of friction between the table and the chain is: 

1. lL

2. lL+l

3. lLl

4. LL+l

Subtopic:  Friction |
 73%
From NCERT
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Block A has a mass of 10 kg. Between block A and the table, the coefficient of static friction is 0.2, and the coefficient of kinetic friction is also 0.2. The required mass of B to start the motion will be:

1. 2 kg 2. 2.2 kg
3. 4.8 kg 4. 200 gm
Subtopic:  Friction |
 70%
From NCERT
PMT - 2004
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A block of mass m lying on a rough horizontal plane is acted upon by a horizontal force P and another force Q inclined at an angle θ to the vertical. The block will remain in equilibrium if the coefficient of friction between it and the surface is: 

      

1. (P+Qsinθ)(mg+Qcosθ)

2. (Pcosθ+Q)(mgQsinθ)

3. (P+Qcosθ)(mg+Qsinθ)

4. (PsinθQ)(mgQcosθ)

Subtopic:  Friction |
 78%
From NCERT
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A lift is going up. The total mass of lift and the passenger is \(1500\) kg. The variation in the speed of the lift is as given in the graph. The tension in the rope pulling the lift at \(t=11^{\text{th}}\) s will be:

      
1. \(17400\) N
2. \(14700\) N
3. \(12000\) N
4. zero

Subtopic:  Application of Laws |
From NCERT
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A particle moves in the XY-plane under the action of a force F such that the components of its linear momentum p at any time t are \(p_x = 2 \cos t\),  \(p_y = 2 \sin t\) . The angle between F and p at time t will be:

1. 90° 2.
3. 180° 4. 30°
Subtopic:  Newton's Laws |
 64%
From NCERT
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Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r2 and the lighter one in the radius r. The tangential speed of lighter stone is n times that of heavier stone when they experience the same centripetal forces. The value of n is:

1. 2 2. 3
3. 4 4.
Subtopic:  Uniform Circular Motion |
 67%
From NCERT
NEET - 2015
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