A body weight W newton at the surface of the earth. Its weight at a height equal to half

the radius of the earth will be

1. w2                    

2. 2w3

3. 4w9                 

4. 8w27

Subtopic:  Acceleration due to Gravity |
 75%
From NCERT
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The escape velocity of a rocket launched from the surface of the earth

1. Does not depend on the mass of the rocket

2. Does not depend on the mass of the earth

3. Depends on the mass of the planet towards which it is moving

4. None of the above

Subtopic:  Escape velocity |
 80%
From NCERT
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Which of the following is the evidence to show that there must be a force acting on earth

and directed towards the sun?

1. Deviation of the falling bodies towards east

2. Revolution of the earth around the sun

3. Phenomenon of day and night

4. The apparent motion of the sun around the earth

Subtopic:  Newton's Law of Gravitation |
 80%
From NCERT
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A mass of  6×1024 kg is to be compressed in a sphere in such a way that the escape

velocity from the sphere is 3×108 m/s. Radius of the sphere should be 

G=6.67×10-11 N-m2/kg2

1. 9 km                     

2. 9 m

3. 9 cm                     

4. 9 mm

Subtopic:  Escape velocity |
 66%
From NCERT
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The mass and diameter of a planet have twice the value of the corresponding parameters

of earth. Acceleration due to gravity on the surface of the planet is

1. 9.8m/sec2                          

2. 4.9m/sec2 

3. 980m/sec2                         

4. 19.6m/sec2           

Subtopic:  Acceleration due to Gravity |
 72%
From NCERT
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Force of gravity is least at

1. The equator

2. The poles

3. A point in between the equator and any pole

4. None of these

Subtopic:  Acceleration due to Gravity |
 80%
From NCERT
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The velocity with which a projectile must be fired so that it escapes earth’s gravitation

does not depend on:

1. Mass of the earth

2. Mass of the projectile

3. Radius of the projectile’s orbit

4. Gravitational constant

Subtopic:  Escape velocity |
 88%
From NCERT
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The gravitational force between two stones of mass 1 kg each separated by a distance of

1 metre in vacuum is

1. Zero                                                 

2. 6.675×105newton

3. 6.675×1011newton                 

4. 6.675×108newton

Subtopic:  Newton's Law of Gravitation |
 80%
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The escape velocity for the Earth is taken \(v_d\). Then, the escape velocity for a planet whose radius is four times and the density is nine times that of the earth, is:

1. \(36v_d\) 2. \(12v_d\)
3. \(6v_d\) 4. \(20v_d\)
Subtopic:  Escape velocity |
 76%
From NCERT
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Two particles of equal mass go round a circle of radius R under the action of their mutual

gravitational attraction. The speed of each particle is

1. ν=12R1Gm                             

2. ν=Gm2R

3. ν=12GmR                               

4. ν=4GmR   

Subtopic:  Newton's Law of Gravitation |
 62%
From NCERT
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