If the tension in the cable of 1000 kg elevator is 1000 kg weight, the elevator:

(1) is accelerating upwards.

(2) is accelerating downwards.

(3) may be at rest or accelerating.

(4) may be at rest or in uniform motion.

Subtopic:  Newton's Laws |
 75%
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An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is 

(1) 3 m/sec2

(2) –3 m/sec2

(3) 0.3 m/sec2

(4) –0.3 m/sec2

Subtopic:  Newton's Laws |
 74%
From NCERT
PMT - 1971
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A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is 

(1) 550 N

(2) 50 N

(3) 250 N

(4) 250 dyne

Subtopic:  Newton's Laws |
 71%
From NCERT
PMT - 1971
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In the above diagram, the acceleration of the car will be:

1. 0.25 m/sec2

2. 2.5 m/sec2

3. 5.0 m/sec2

4. 0.025 m/sec2

Subtopic:  Application of Laws |
 83%
From NCERT
PMT - 1971
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A particle of mass 0.3 kg is subjected to a force F = –kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin

(1) 5 m/s2

(2) 10 m/s2

(3) 3 m/s2

(4) 15 m/s2

Subtopic:  Spring Force |
 87%
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An elevator weighing 6000 kg is pulled upward by a cable with an acceleration of 5 ms–2. Taking g to be 10 ms–2, then the tension in the cable is 

(1) 6000 N

(2) 9000 N

(3) 60000 N

(4) 90000 N

Subtopic:  Application of Laws |
 85%
From NCERT
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The ratio of the weight of a man in a stationary lift and when it is moving downward with uniform acceleration ‘a’ is 3 : 2. The value of ‘a’ is (g-Acceleration due to gravity of the earth) 

1. 32g

2. g3

3. 23g

4. g

Subtopic:  Application of Laws |
 76%
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If force on a rocket having exhaust velocity of 300 m/sec is 210 N, then rate of combustion of the fuel is 

(1) 0.7 kg/s

(2) 1.4 kg/s

(3) 0.07 kg/s

(4) 10.7 kg/s

Subtopic:  Variable Mass System |
 84%
From NCERT
PMT - 1999
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In an elevator moving vertically up with an acceleration g, the force exerted on the floor by a passenger of mass M is:

(1) Mg

(2) 12Mg

(3) Zero

(4) 2 Mg

Subtopic:  Application of Laws |
 66%
From NCERT
PMT - 1999
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A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms–1. To give an initial upward acceleration of 20 ms–2, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms–2) 

(1) 127.5 kg s–1

(2) 187.5 kg s–1

(3) 185.5 kg s–1

(4) 137.5 kg s–1

Subtopic:  Variable Mass System |
 63%
From NCERT
PMT - 1998
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