Gravitation Class 9 Physics Worksheet Pdf
Class 9 Physics students should refer to the following printable worksheet in Pdf for Gravitation in standard 9. This test paper with questions and answers for Grade 9 Physics will be very useful for exams and help you to score good marks
Class 9 Physics Worksheet for Gravitation
CBSE Class 9 Physics Worksheet - Gravitation
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MULTIPLE CHOICE QUESTIONS
1. Two objects of different masses falling freely near the surface of moon would
(a) have same velocities at any instant
(b) have different accelerations
(c) experience forces of same magnitude
(d) undergo a change in their inertia
2. The value of acceleration due to gravity
(a) is same on equator and poles
(b) is least on poles
(c) is least on equator
(d) increases from pole to equator
3. The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become
(a) F/4 (b) F/2 (c) F (d) 2 F
4. A boy is whirling a stone tied with a string in an horizontal circular path. If the string breaks, the stone
(a) will continue to move in the circular path
(b) will move along a straight line towards the centre of the circular path
(c) will move along a straight line tangential to the circular path
(d) will move along a straight line perpendicular to the circular path away from the boy
5. An object is put one by one in three liquids having different densities. The object floats with 1 , 2 3 9 11 7 and parts of their volumes outside the liquid surface in liquids of densities d1, d2 and d3 respectively. Which of the following statement is correct?
(a) d1> d2> d3
(b) d1> d2< d3
(c) d1< d2> d3
(d) d1< d2< d3
6. In the relation F = G M m/d2, the quantity G
(a) depends on the value of g at the place of observation
(b) is used only when the earth is one of the two masses
(c) is greatest at the surface of the earth
(d) is universal constant of nature
7. Law of gravitation gives the gravitational force between
(a) the earth and a point mass only
(b) the earth and Sun only
(c) any two bodies having some mass
(d) two charged bodies only
8. The value of quantity G in the law of gravitation
(a) depends on mass of earth only
(b) depends on radius of earth only
(c) depends on both mass and radius of earth
(d) is independent of mass and radius of the earth
Exam Questions NCERT Class 9 Science Chapter 10 Gravitation
Question. . The gravitational force acts on all objects in proportion to their masses. Why, then, a heavy object does not fall faster than a light object?
Ans : Acceleration due to gravity does not depend on mass of object. Hence, all bodies fall with the same acceleration provided there is no air or other resistance.
Question. . Is value of “g” same at all places on the Earth? Give reason for your answer.
Ans : No, the value of “g” is maximum at the poles and minimum at equator. This variation is because to the oblong shape of the Earth and its rotation about its own axis.
Question. . Define the weight of an object on Moon.
Ans : The weight of an object on the Moon is the force with which the Moon attracts that object.
Question. . Why does a mug full of water feel lighter inside water?
Ans : A mug of water appears lighter inside the water because a buoyant force acts on the mug when placed inside the water.
Question. . What is the importance of universal law of gravitation?
Write four phenomenons which were successfully explained using universal law of gravitation.
Ans : Many unconnected phenomenon can be explained by gravitational law successfully.
(i) Force bind us with Earth
(ii) Motion of Moon around Earth
(iii) Motion of planet around Sun
(iv) Tides due to the Moon and Sun
Question. . What is the relation between gravitational force of the Moon with the Earth.
Ans : The gravitational force of the Moon is about one-sixth of what it is on the Earth.
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