## MCQ on Acceleration due to Gravity

Question 1 |

An object weights 72

*N*on earth. Its weight at a height of*R*/2 from earth is32 N | |

56 N | |

72 N | |

Zero |

Question 2 |

A research satellite of mass 200

*kg*circles the earth in an orbit of average radius 3*R*/2 where*R*is the radius of the earth. Assuming the gravitational pull on a mass of 1*kg*on the earth’s surface to be 10*N*, the pull on the satellite will be880 N | |

890 N | |

889 N | |

892 N |

Question 3 |

In order to find time, the astronaut orbiting in an earth satellite should use

Either a pendulum clock or a watch | |

A watch having main spring to keep it going | |

Neither a pendulum clock nor a watch | |

A pendulum clock |

Question 4 |

A body has a weight 90

*kg*on the earth's surface, the mass of the moon is 1/9 that of the earth's mass and its radius is 1/2 that of the earth's radius. On the moon the weight of the body is202.5 kg | |

45 kg | |

90 kg | |

40 kg |

Question 5 |

The acceleration of a body due to the attraction of the earth (radius

*R*) at a distance 2*R*from the surface of the earth is (*g*= acceleration due to gravity at the surface of the earth)g/9 | |

g/3 | |

g | |

g/4 |

Question 6 |

If it is assumed that the spinning motion of earth increases, then the weight of a body on equator

Increases | |

Becomes more at poles | |

Remains constant | |

Decreases |

Question 7 |

Weight of a body of mass

*m*decreases by 1% when it is raised to height*h*above the earth’s surface. If the body is taken to a depth*h*in a mine, change in its weight is0.5% decrease | |

1% increase | |

0.5% increase | |

2% decrease |

Question 8 |

As we go from the equator to the poles, the value of

*g*Increases | |

Decreases | |

Remains the same | |

Decreases upto a latitude of 45° |

Question 9 |

If the angular speed of the earth is doubled, the value of acceleration due to gravity (

*g*) at the north poleDoubles | |

Becomes zero | |

Becomes half | |

Remains same |

Question 10 |

Acceleration due to gravity decreases as we go up from the surface of the earth. Then in going below the surface of the earth it

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Increases | |

Remains constant | |

Decreases | |

Decreases then increases |

Question 11 |

An iron ball and a wooden ball of the same radius are released from a height ‘

*h*’ in vacuum. The time taken by both of them to reach the ground isUnequal | |

Exactly equal | |

Roughly equal | |

Zero |

Question 12 |

Radius of earth is around 6000

*km*. The weight of body at height of 6000*km*from earth surface becomesNo change | |

Half | |

One third | |

One-fourth |

Question 13 |

A man can jump to a height of 1.5

*m*on a planet*A*. What is the height he may be able to jump on another planet whose density and radius are, respectively, one-quarter and one-third that of planet*A*18 m | |

28 m | |

1.5 m | |

15 m |

Question 14 |

If the Earth losses its gravity, then for a body

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Weight becomes zero, but not the mass | |

Mass becomes zero, but not the weight | |

Both mass and weight become zero | |

Neither mass nor weight become zero |

Question 15 |

If both the mass and the radius of the earth decrease by 1%, the value of the acceleration due to gravity will

Decrease by 1% | |

Remain unchanged | |

Increase by 2% | |

Increase by 1% |

Question 16 |

Weight of a body is maximum at

Centre of Earth | |

Moon | |

Equator of Earth | |

Poles of earth |

Question 17 |

If mass of a body is

*M*on the earth surface, then the mass of the same body on the moon surface isM | |

M/6 | |

Zero | |

None of these |

Question 18 |

If the radius of the earth shrinks by 1.5% (mass remaining same), then the value of acceleration due to gravity changes by

3% | |

1% | |

2% | |

4% |

Question 19 |

The time period of a simple pendulum on a freely moving artificial satellite is

Zero | |

3 sec | |

Infinite | |

2 sec |

Question 20 |

Spot the

*wrong*statement : The acceleration due to gravity ‘*g*’ decreases ifWe go up from the surface of the earth | |

We go down from the surface of the earth towards its centre | |

The rotational velocity of the earth is increased | |

We go from the equator towards the poles on the surface of the earth |

Question 21 |

Force of gravity is least at

None of these | |

The poles | |

The equator | |

A point in between equator and any pole |

Question 22 |

If the value of ‘

*g*’ acceleration due to gravity, at earth surface is 10 m/s^{2}, its value in m/s^{2}at the centre of the earth, which is assumed to be a sphere of radius ‘*R*’*metre*and uniform mass density is10/R | |

5 | |

Zero | |

10/2R |

Question 23 |

If the earth rotates faster than its present speed, the weight of an object will

Decrease at the equator but remain unchanged at the poles | |

Remain unchanged at the equator but increase at the poles | |

Increase at the equator but remain unchanged at the poles | |

Remain unchanged at the equator but decrease at the poles |

Question 24 |

A body weight 500

*N*on the surface of the earth. How much would it weigh half way below the surface of the earth125 N | |

250 N | |

500 N | |

1000 N |

Question 25 |

When a body is taken from the equator to the poles, its weight

Remains constant | |

Increases | |

Decreases | |

Increases at N-pole and decreases at S-pole |

Question 26 |

The depth at which the effective value of acceleration due to gravity is g/4 is

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R/2 | |

3R/4 | |

R | |

R/4 |

There are 26 questions to complete.

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