Choose the incorrect alternative:

1. Newton's first law is the law of inertia.
2. Newton's first law states that if the net force on a system is zero, the acceleration of any particle of the system is not zero.
3. Action and reaction act simultaneously.
4. The area under the force-time graph is equal to the change in momentum.

Subtopic:  Newton's Laws |
 85%
From NCERT
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A block slides down on a 45° rough incline in thrice the time it takes to slide down on a frictionless 45° incline of the same length. The coefficient of friction between the block and the rough incline is:

1. 0.6 2. 0.7
3. 0.5 4. 0.9

Subtopic:  Friction |
 59%
From NCERT
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The kinetic energy 'K' of a particle moving in a circular path varies with the distance covered S as K = aS2, where a is constant. The angle between the tangential force and the net force acting on the particle is: (R is the radius of the circular path)

1.  tan-1SR

2.  tan-1RS

3.  tan-1aR

4.  tan-1Ra

Subtopic:  Non Uniform Vertical Circular Motion |
From NCERT
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The tension in the string connecting blocks, B and C, placed on a smooth horizontal surface in the following diagram is:

                   

1. 25 N 2. 30 N
3. 32.5 N 4. 37.5 N
Subtopic:  Application of Laws |
 80%
From NCERT
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If two forces (6i^ + 8j^) and (4i^ + 4j^) N are acting on a body of mass 2 kg, then the acceleration produced in the body in m/s2 will be:

1. (5i^ + 6j^)

2. (10i^ + 12j^)

3. (6i^ + 12j^)

4. (2i^ + 3j^)

Subtopic:  Newton's Laws |
 83%
From NCERT
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The friction between the front foot and the back foot when walking on a horizontal surface is, respectively:

1. Forward, forward

2. Backward, backward

3. Forward, backward

4. Backward, forward

Subtopic:  Friction |
From NCERT
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A simple pendulum hangs from the roof of a train moving on horizontal rails. If the string is inclined towards the front of the train, then the train is:

1. moving with constant velocity.

2. in accelerated motion.

3. in retarded motion.

4. at rest.

Subtopic:  Application of Laws |
 73%
From NCERT
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A block of mass M is pulled by a force F, making an angle θ with the horizontal on a smooth horizontal surface as shown. If a is the acceleration of block on the surface, then the contact force between the block and the surface will be:
        
1. Mg + Macosθ

2. Mg - Macosθ

3. Mg + Matanθ

4. Mg - Matanθ

Subtopic:  Application of Laws |
From NCERT
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A body of mass m is moving on a concave bridge ABC of the radius of curvature R at a speed v. The normal reaction of the bridge on the body at the instant it is at the lowest point of the bridge is:

                            

1.  mg - mv2R

2.  mg + mv2R

3.  mg

4.  mv2R

Subtopic:  Uniform Circular Motion |
 73%
From NCERT
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A block B of mass \(3\) kg is kept on block A of mass \(5\) kg in a lift accelerating upward with an acceleration of \(g.\) The reaction by A on B is:                                                 

1. \(10g\) 2. \(16g\)
3. \(4g\) 4. \(6g\)

Subtopic:  Application of Laws |
 54%
From NCERT
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