GK Questions and Answers on Gravitation

How gravity works, what causes gravity, what is gravity made of, etc. is discussed in this article in the form of questions and answers which will help to understand the concept and its applications.

The force which attracts any object with mass is known as gravitational force. In fact, every object, including you, is pulling on every other object in the entire universe and is known as Universal Law of Gravitation. If any object is far apart from each other will not pull on each other but the force between them is there. The force that holds gases in the sun, the force due to which any object thrown up in the air comes down is nothing but gravity. 

1. The period of artificial geostationary satellite is:
A. 8 hours
B. 12 hours
C. 24 hours
D. 46 hours
Ans. C
2. If the mass of the earth is not changed and its radius decreased by 1% then the acceleration due to gravity on the surface of the earth would be:
A. Increase by 2 %
B. Decrease by 2 %
C. Increase by 9.8 %
D. Remains unchanged
Ans. A
3. When satellite orbits close to a planet, its time period depends upon:
A. The mass of satellite
B. Radius of the planet
C. Mass of the planet
D. Density of the planet
Ans. D
4. The value of universal gravitational constant G is:
A. 9.8 m/s2
B. 6.673×10-11 N m2 kg-2
C. 6.371 x 106 m
D. 1.738 x 10 6 m
Ans. B
5. When body falls towards earth its motion is due to:
A. Gravitational force
B. Motion due to gravity
C. Acceleration due to gravity
D. Because of zero weight
Ans. A

Do you know that our moon is made up of 20 smaller moonlets?
6. Name the world’s first artificial Satellite?
A. Sputnik 1
B. INSAT-1B
C. Explorer 1
D. Aryabhata
Ans. A
7. What is the unit of the magnitude of the weight?
A. Distance (meter)
B. Mass (grams)
C. Force (Newton)
D. None of the above
Ans. C
8. Acceleration due to gravity decreases with:
A. Height
B. Weight
C. Amplitude
D. Altitude
Ans. D
9. Who said that in the universe every body exerts a gravitational force on every other body?
A. Einstein
B. Irene Curie
C. Sir Isaac Newton
D. Galileo Galilei
Ans. C
10. Do you know the acceleration of the moon depends upon:
A. Gravitational force exerted on the moon by the Sun
B. Gravitational force exerted on the moon by the Planets
C. Gravitational force exerted on the moon by the Earth
D. Gravitational force exerted on the Earth by the Moon.
Ans. C

The Solar System and Satellites