NIOS Class 10 Science and Technology Chapter 11: GRAVITATION– Chapter-wise Important Questions and Answers
NIOS Class 10 Science and Technology Chapter 11: GRAVITATION | MCQs, Short & Long Answer Questions | 9 . MOTION AND ITS DESCRIPTION
Chapter 11: GRAVITATION
INTEXT QUESTIONS 11.1
1. Why do two students sitting close to each other not feel force of gravitational attraction between them?
Answer: Gravitational force is extremely weak. Therefore, small masses do not attract each other due to this force.
2. Distance between two bodies is increased by a factor of four. How much will be the change in the force of gravitation?
Answer: As the force of gravitation is inversely proportional to the square of the distance between two bodies, the force will decrease by a factor of 1/16.
3. Why is G known as universal gravitational constant?
Answer: The value of G is same everywhere on the earth or in the universe. Therefore, G is known as universal gravitational constant.
INTEXT QUESTIONS 11.2
1. What do you mean by acceleration due to gravity?
Answer: The acceleration produced due to force of attraction by the earth is known as acceleration due to gravity.
2. Why do a heavier and a lighter object when dropped from a same height fall at the same rate?
Answer: Because the acceleration due to gravity is same for both heavy and light objects.
3. State SI unit of acceleration due to gravity.
Answer: SI unit for acceleration due to gravity is m/s² .
4. Write equations of motion of an object moving under gravity.
Answer: The equations of motion for an object moving under gravity are:
(i) v=u+at 
(ii) s=ut+12gt2
(iii) v²=u²+2gs 
Where, u = initial velocity, v = final velocity, s = displacement , t = time, and g = acceleration due to gravity
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