MCQs | Physics 9th | Chapter 5 | Gravitation | National Book Foundation | New Book
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Multiple Choice Questions
1. Choose
Multiple Choice Questions
1. Choose the best possible option.
Two identical balls of masses 1kg, each having distance of 1m between their centers, then gravitational force between them is:
(a) 667×〖10〗^(-9) N (b) 6.67×〖10〗^(-11) N (c) 667×〖10〗^11 N (d) 6.67×〖10〗^(-13) N
The gravitational force between two objects if “F”. If masses of bodies are doubled and distance between their centers is reduced to half then gravitational force is:
(a) F (b) 4F (c) F/4 (d) 16F
The force of gravity applied by Earth on Sun is ________ that of Sun on Earth.
(a) greater than (b) smaller then
(c) sometimes greater or smaller than (d) same as
The weight of a body on the earth is 100N, what is its weight on the moon?
(a) 10kg (b) 10N (c) 100N (d) 16.67N
The weight of an object is smallest at
(a) poles (b) Murree (c) Moon (d) Equator
The value of gravitational field strength near the surface of earth:
(a) 9.8 N/kg (b) 1.6 N/kg
(c) Different for different masses (d) infinity (because all objects fall on earth)
The GPS satellites system has ______ satellites
(a) 1 (b) 3 (c) 12 (d) 24
Two satellites are revolving around the earth in the same orbit, which one will have the greater orbital speed?
(a) heavier satellite (b) lighter satellite
(c) same (d) controlled by persons on ground
What will be the effect on orbital velocity of satellite if the mass of Earth increases 4 times but the radius of Earth remains same?
(a) increases 2 times (b) increases 4 times (c) increases 16 times (d) remains same
At the height equal to two time the radius of earth, the value of g will be
(a) g/9 (b) g/3 (c) g/4 (d) g
The value of g decreases with
(a) increase in mass of body (b) falling towards earth surface
(c) decrease in mass of body (d) moving away from earth surface
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