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%
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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%
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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%
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A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/sec. A plumb bob is suspended from the roof of the car by a light rigid rod of length 1.00 m. The angle made by the rod with the track is

1.  Zero

2.  30°

3.  45°

4.  60°

Subtopic:  Banking of Roads |
 66%
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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%
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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%
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A body of 5 kg is moving with a velocity of 20 m/s. If a force of 100 N is applied on it for 10 sec in the same direction as its velocity, what will now be the velocity of the body?

(1) 200 m/s

(2) 220 m/s

(3) 240 m/s

(4) 260 m/s

Subtopic:  Newton's Laws |
 84%
From NCERT
PMT - 2000
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A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is  

(1) Doubled

(2) Quadrupled

(3) Halved

(4) Unchanged

Subtopic:  Uniform Circular Motion |
 60%
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PMT - 1974
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If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be

(1) mg+mv2r

(2) mgmv2r

(3) m2v2gr

(4) v2gr

Subtopic:  Uniform Circular Motion |
 69%
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