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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Two blocks A and B of masses m & 2m respectively are held at rest such that the spring is in natural length. Find the accelerations of both the blocks just after release.

(1) g, g

(2) g3, g3

(3) (0, 0)

(4) g, 0

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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A body moves along an uneven surface with constant speed at all points. The normal reaction due to ground on the body is:

       

1. maximum at \(A\)
2. maximum at \(B\)
3. minimum at \(C\)
4. the same at \(A, B\) and \(C\)

Subtopic:  Uniform Circular Motion |
 52%
From NCERT
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Two masses, m and M, are connected by a light string passing over a smooth pulley. When mass m moves up by 1.4 m in 2 sec, the ratio mM is:

1. \(\frac{13}{15} \) 2. \(\frac{15}{13} \)
3. \(\frac{9}{7} \) 4. \(\frac{7}{9}\)
Subtopic:  Application of Laws |
 50%
From NCERT
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Two blocks A and B of masses 4 kg and 12 kg are placed on a smooth plane surface. A force F of 16 N is applied on A as shown. The force of contact is :

1. 4 N

2. 8 N

3. 12 N

4. 16 N

Subtopic:  Newton's Laws |
 72%
From NCERT
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The engine of a car produces an acceleration of 4 m/s2 in the car. If this car pulls another car of the same mass, what will be the acceleration produced?

(1) 8 m/s2

(2) 2 m/s2

(3) 4 m/s2

(4) 12m/s2   

Subtopic:  Newton's Laws |
 65%
From NCERT
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A truck and a car are moving with equal velocity. If equal retarding force is applied on each, then on applying the brakes both will stop after certain distance 

(1) Truck will cover less distance before rest

(2) Car will cover less distance before rest

(3) Both will cover equal distance

(4) None

Subtopic:  Newton's Laws |
From NCERT
PMT - 1997
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A constant force acts on a body of mass 0.9 kg at rest for 10s. If the body moves a distance of 250 m, the magnitude of the force is 

(1) 3 N

(2) 3.5 N

(3) 4.0 N

(4) 4.5 N

Subtopic:  Newton's Laws |
 80%
From NCERT
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Two particles of equal masses are revolving in circular paths of radii r1 and r2 respectively with the same speed. The ratio of their centripetal forces is 

(1) r2r1

(2) r2r1

(3) r1r22

(4) r2r12

Subtopic:  Uniform Circular Motion |
 85%
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