Let θ denote the angular displacement of a simple pendulum oscillating in a vertical plane. If the mass of bob is m, the tension in the string is mgcosθ-

1.  always 

2.  never

3.  at extreme

4.  at mean position

Subtopic:  Non Uniform Vertical Circular Motion |
 56%
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The graph for stopping time (t) versus mass (m) is shown in the figure. Then which one of the pairs is given?

       

1.  Momentum, force

2.  K.E., force

3.  Velocity, force

4.  None of these

Subtopic:  Application of Laws |
From NCERT
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A metal ring of mass m and radius R is placed on smooth horizontal table and is set rotating about its own axis in such a way that each part of the ring moves with a speed v. Tension in the ring is:

1. mv2R

2. mv22R

3. mv22πR

4. None of these

Subtopic:  Uniform Circular Motion |
From NCERT
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Tension on the string at point P is T. The graph for tension (T) versus x is shown in the figure. Then the string is:

1.  massless

2.  massfull

3.  tension on every point on the string is same when the string is having finite mass 4

4.  None of these

Subtopic:  Application of Laws |
 62%
From NCERT
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A block is kept on a rough inclined plane with angle of inclination θ. The graph of net reaction (R) versus θ is:

1. 

2. 

3. 

 

(4) None of these

Subtopic:  Application of Laws |
From NCERT
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A block is placed on a rough horizontal plane. A time dependent horizontal force F=kt acts on the block. The acceleration time graph of the block is :

1. 

2. 

3. 

4. 

Subtopic:  Application of Laws |
From NCERT
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A motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the overbridge, the normal force on it:

1.  Increases

2.  decreases

3.  remains the same

4.  fluctuates erratically

Subtopic:  Non Uniform Vertical Circular Motion |
 52%
From NCERT
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A rod of length L and mass m is acted on by two unequal forces F1 and F2<F1 as shown in the following figure

The tension in the rod at a distance y from the end A is given by :

1. F11-yL+F2yL

2. F21-yL+F1yL

3. F1-F2yL

4. None of the above

Subtopic:  Application of Laws |
 56%
From NCERT
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Two blocks 'A' and 'B' each of mass 'm' are placed on a smooth horizontal surface. Two horizontal force F and 2F are applied on both the blocks 'A' and 'B' respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two blocks is:

(1) F

(2) F/2

(3) F3

(4) 3F

Subtopic:  Application of Laws |
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Five persons A, B, C, D & E are pulling a cart of mass 100 kg on a smooth surface and the cart is moving with acceleration 3 m/s2 in east direction. When person 'A' stops pulling, it moves with acceleration 1 m/s2 in the west direction. When person 'B' stops pulling, it moves with acceleration 24 m/s2 in the north direction. The magnitude of the acceleration of the cart when only A & B pull the cart keeping their directions same as the old directions are:

1.  26 m/s2

2.  371 m/s2

3.  25 m/s2

4.  30 m/s2

Subtopic:  Application of Laws |
 53%
From NCERT
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