Rocket engines lift a rocket from the earth surface because hot gases with high velocity:

1. push against the earth.

2. push against the air.

3. react against the rocket and push it up.

4. heat up the air which lifts the rocket.

Subtopic:  Variable Mass System |
 55%
From NCERT
AIIMS - 1998
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A force of 50 dynes is acted on a body of mass 5 g which is at rest for an interval of 3 seconds, then impulse is 

1. 0.15×103Ns

2. 0.98×103Ns

3. 1.5×103Ns

4. 2.5×103Ns

Subtopic:  Newton's Laws |
 77%
From NCERT
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Three forces starts acting simultaneously on a particle moving with velocity v. These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity 

1. v remaining unchanged

2. Less than v

3. Greater than v

4. v in the direction of the largest force BC

Subtopic:  Application of Laws |
 76%
From NCERT
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Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 m/s2 in the upward direction in both the blocks. If T and T’ be the tensions in the two parts of the string, then 

1. T = 70.8 N and T’ = 47.2 N

2. T = 58.8 N and T’ = 47.2 N

3. T = 70.8 N and T’ = 58.8 N

4. T = 70.8 N and T’ = 40.2 N

Subtopic:  Application of Laws |
 68%
From NCERT
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A block is kept on a frictionless inclined surface with an angle of inclination 'α'. The incline is given an acceleration 'a' to keep the block stationary. Then a is equal to 

1. g

2. gtanα

3. g/tanα

4. gcosecα

Subtopic:  Pseudo Force |
 84%
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A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be: 

1. P

2. PmM+m

3. PMM+m

4. PmMm

Subtopic:  Application of Laws |
 64%
From NCERT
PMT - 1993
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Three equal weights A, B and C of mass 2 kg each are hanging on a string passing over a fixed frictionless pulley as shown in the figure The tension in the string connecting weights B and C is 

1. Zero

2. 13 N

3. 3.3 N

4. 19.6 N

Subtopic:  Application of Laws |
 61%
From NCERT
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Two masses of 4 kg and 5 kg are connected by a string passing through a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is

1. 49 m/s2

2. 5.44 m/s2

3. 19.5 m/s2

4. 2.72 m/s2

Subtopic:  Application of Laws |
 81%
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Two masses 2 kg and 3 kg are attached to the end of the string passed over a pulley fixed at the top. The tension and acceleration are

1. 7g8;g8

2. 21g8;g8

3. 21g8;g5

4. 12g5;g5

Subtopic:  Application of Laws |
 86%
From NCERT
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Three blocks A, B and C weighing 1, 8 and 27 kg respectively are connected as shown in the figure with an inextensible string and are moving on a smooth surface. T3 is equal to 36 N. Then T2 is 

1. 18 N

2. 9 N

3. 3.375 N

4. 1.25 N

Subtopic:  Newton's Laws |
 86%
From NCERT
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