## Multiple Choice Questions on Gravitation

Select the best possible option.

- 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. | C. 1/2 | D. 1/4 |

- The radius of earth r
_{g}is

A. 9.8 m | B. 6.67 × 10 | C. 6 × 10 | D. |

- The SI unit for gravitational constant G is

A. N kg | B. | C. N m | D. N m |

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

A. | B. 118 | C. 784 kg | D. More information needed |

- 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. | B. 4 | C. 1/2 | D. 1/4 |

- The value of g at the surface of the moon is

A. 9.8 ms | B. | C. 4.9 ms | D. 8.9 ms |

- The value of g —————— with altitude

A. increases | B | C. gets zero | D. remains the same |

- 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. | C. none | D. both mass and weight |

- The value of g at equator is

A. same at poles | B. larger at poles | C. | D. none |