The mass of the moon is 7.34×1022kg and the radius is 1.74×106m. The value of

gravitation field will be

1. 1.45 N/kg                               

2. 1.55 N/kg

3. 1.75 N/kg                               

4.  1.62 N/kg

Subtopic:  Gravitational Field |
 58%
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The centripetal force acting on a satellite orbiting round the earth and the gravitational

force of earth acting on the satellite both equal F. The net force on the satellite is

1. Zero                                  

2. F

3. F2                                 

4. 2 F

Subtopic:  Satellite |
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Reason of weightlessness in a satellite is:

1. Zero gravity

2. Centre of mass

3. Zero reaction force by satellite surface

4. None

Subtopic:  Satellite |
 59%
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Mass M is divided into two parts xM and 1-xM . For a given separation, the value of x

for which the gravitational attraction between the two pieces becomes maximum is

1. 12                                 

2. 35

3. 1                                   

4. 2

Subtopic:  Newton's Law of Gravitation |
 75%
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If earth is supposed to be a sphere of radius R, if g30° is value of acceleration due to gravity at latitude of 30o and g at the pole, the value of g-g30ο is

1. 14 ω2R                      

2. 34ω2R

3. ω2R                           

4. 12ω2R

Subtopic:  Acceleration due to Gravity |
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If M the mass of the earth and R its radius, the ratio of the gravitational acceleration and

the gravitational constant is

1. R2M                       

2. MR2

3. MR2                       

4. MR

Subtopic:  Acceleration due to Gravity |
 86%
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Two sphere of mass m and M are situated in air and the gravitational force between them

is F. The space around the masses is now filled with a liquid of specific gravity 3. The

gravitational force will now be

1. F                                        

2. F3  

3. F9                                      

4. 3 F

Subtopic:  Newton's Law of Gravitation |
 78%
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Earth binds the atmosphere because of:

1. Gravity                                     

2. Oxygen between earth and atmosphere

3. Both 1 and 2

4 None of these

Subtopic:  Newton's Law of Gravitation |
 78%
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The mass of the earth is 81 times that of the moon and the radius of the earth is 3.5

times that of the moon. The ratio of the acceleration due to gravity at the surface of the

moon to that at the surface of the earth is

1. 0.15           

2. 0.0

3. 1             

4. 6

Subtopic:  Acceleration due to Gravity |
 73%
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Spot the wrong statement :

The acceleration due to gravity ‘g’ decreases if

1. We go down from the surface of the earth towards its centre

2. We go up from the surface of the earth

3. We go from the equator towards the poles on the surface of the earth

4. The rotational velocity of the earth is increased

Subtopic:  Acceleration due to Gravity |
 75%
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