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Multiple Choice Questions on Gravitation

Select the best possible option.

  1. Two masses are separated by a distance r. If both masses are doubled, the force of interaction between the two masses changes by a factor

A. 2

B. 4

C. 1/2

D. 1/4


  1. The radius of earth rg is

A. 9.8 m

B. 6.67 × 10-11 m

C. 6 × 1024 m

D. 6.4 × 106 m


  1. The SI unit for gravitational constant G is

A. N kg2

B. N m2 kg-2

C. N m2 kg2

D. N m-2 kg2


  1. What is the mass on planet mercury of an object that weighs 784 N on the earth’s surface?

A. 80.0 kg

B. 118

C. 784 kg

D. More information needed


  1. An object is orbiting a planet with orbital speed v. If the radius is same and the mass in increased 4 times, by what factor orbital speed will change?

A. 2

B. 4

C. 1/2

D. 1/4


  1. The value of g at the surface of the moon is

A. 9.8 ms-2

B. 1.63 ms-2

C. 4.9 ms-2

D. 8.9 ms-2


  1. The value of g —————— with altitude

A. increases

B. decreases

C. gets zero

D. remains the same


  1. When a body is moved from the sea level to the top of a mountain, there is change in the body’s

A. mass

B. weight

C. none

D. both mass and weight


  1. The value of g at equator is

A. same at poles

B. larger at poles

C. smaller at poles

D. none


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