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Class 9 Exam  >  Class 9 Tests  >  Important Questions (1 mark): Gravitation - Class 9 MCQ

Important Questions (1 mark): Gravitation - Class 9 MCQ


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20 Questions MCQ Test - Important Questions (1 mark): Gravitation

Important Questions (1 mark): Gravitation for Class 9 2024 is part of Class 9 preparation. The Important Questions (1 mark): Gravitation questions and answers have been prepared according to the Class 9 exam syllabus.The Important Questions (1 mark): Gravitation MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions (1 mark): Gravitation below.
Solutions of Important Questions (1 mark): Gravitation questions in English are available as part of our course for Class 9 & Important Questions (1 mark): Gravitation solutions in Hindi for Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Important Questions (1 mark): Gravitation | 20 questions in 10 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study for Class 9 Exam | Download free PDF with solutions
Important Questions (1 mark): Gravitation - Question 1
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The universal law of gravitation was postulated by

Important Questions (1 mark): Gravitation - Question 2
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There is no atmosphere on moon as

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Important Questions (1 mark): Gravitation - Question 3
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The constant G

Detailed Solution for Important Questions (1 mark): Gravitation - Question 3

The small size of the gravitational constant G  tells you that  the gravitational force is actually quite weak compared to other known  forces  like the electric, magnetic and  nuclear forces.

Important Questions (1 mark): Gravitation - Question 4
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Acceleration due to gravity is
Important Questions (1 mark): Gravitation - Question 5
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If the radius of earth were to shrink by 1%, its mass remaining the same, the acceleration due to gravity on earth’s surface would
Important Questions (1 mark): Gravitation - Question 6
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An apple and a stone dropped from certain height accelerates
Important Questions (1 mark): Gravitation - Question 7
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The gravitational force between two bodies does not depend on
Important Questions (1 mark): Gravitation - Question 8
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 Weight of 1 kg is
Important Questions (1 mark): Gravitation - Question 9
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10 kg wt equals
Important Questions (1 mark): Gravitation - Question 10
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A body at rest having uniform acceleration is
Detailed Solution for Important Questions (1 mark): Gravitation - Question 10

The correct option is Option C.

A body at rest having uniform acceleration is any body thrown vertically up against gravity.

When a body is thrown vertically upwards, at the highest point only velocity is zero because the acceleration due to gravitational force is acting downward continuously and that is the reason for velocity being zero at the highest point, hence velocity is zero because of the acceleration.

Important Questions (1 mark): Gravitation - Question 11
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At which of the following locations is the value of g largest?
Important Questions (1 mark): Gravitation - Question 12
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acceleration due to gravity varies with
Important Questions (1 mark): Gravitation - Question 13
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Two objects of different masses falling freely near the surface of moon would 
Detailed Solution for Important Questions (1 mark): Gravitation - Question 13

When an object is under free fall, its acceleration depends only on the acceleration due to gravity and mass has no role to play. Due to this; irrespective of their masses, the object under free fall with have the same velocity at any instant.

Important Questions (1 mark): Gravitation - Question 14
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Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be
Important Questions (1 mark): Gravitation - Question 15
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In the relation , the quantity  G
Important Questions (1 mark): Gravitation - Question 16
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The force of attraction between two unit point masses separated by a unit distance is called
Important Questions (1 mark): Gravitation - Question 17
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Two particles are placed at some distance. If mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will become/remain
Important Questions (1 mark): Gravitation - Question 18
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 An apple falls from a tree because of gravitational attraction between the earth and apple. If F1 is the magnitude of force exerted by the earth on the apple and F2 is the magnitude of force exerted by apple on earth, then
Detailed Solution for Important Questions (1 mark): Gravitation - Question 18

so we can see that f is equal to f₂ 

Important Questions (1 mark): Gravitation - Question 19
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The weight of an object at the centre of the earth of radius R is
Detailed Solution for Important Questions (1 mark): Gravitation - Question 19

The weight of the body at the surface of the earth is equal to zero. The accelertion due to gravity is maximum on the surface of the earth and as we towards the centre of the equator it becomes zero.


The acceleration due to gravity varies due to the shape of the earth. The radius of the earth is more at the equator than at the poles.

 
Thus, the value of g at the centre of the earth is zero.

Important Questions (1 mark): Gravitation - Question 20
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Freely falling objects weight ._______.
Detailed Solution for Important Questions (1 mark): Gravitation - Question 20

An object kept in a lift which falls freely  , weighs zero on the weighing machine , but its actual  weight is still mg. This happens  because the normal reaction force Exerted on the object in the lift is equal to mg,which in turn equals the  weight of the  object.

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