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