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Gravitation - Practice Test, Class 9 Science - Class 9 MCQ


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20 Questions MCQ Test - Gravitation - Practice Test, Class 9 Science

Gravitation - Practice Test, Class 9 Science for Class 9 2024 is part of Class 9 preparation. The Gravitation - Practice Test, Class 9 Science questions and answers have been prepared according to the Class 9 exam syllabus.The Gravitation - Practice Test, Class 9 Science MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Gravitation - Practice Test, Class 9 Science below.
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Gravitation - Practice Test, Class 9 Science - Question 1

The relative density

Gravitation - Practice Test, Class 9 Science - Question 2

The gravitational force between two bodies is

Gravitation - Practice Test, Class 9 Science - Question 3

The value of acceleration due to gravity of the surface of the earth is

Gravitation - Practice Test, Class 9 Science - Question 4

The atmosphere is held to the earth by

Gravitation - Practice Test, Class 9 Science - Question 5

The value of acceleration due to gravity

Gravitation - Practice Test, Class 9 Science - Question 6

Law of gravitation gives the gravitational force between

Gravitation - Practice Test, Class 9 Science - Question 7

The value of ‘g’ at a particular point is 9.8 m/sec2 suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of ‘g at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become

Gravitation - Practice Test, Class 9 Science - Question 8

If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth’s surface would

Detailed Solution for Gravitation - Practice Test, Class 9 Science - Question 8
g=GMR2
dgg=−2dRR
given dRR=−1%
=>dgg=2%
∴ g increases by 2%
Hence b is the correct answer.
Gravitation - Practice Test, Class 9 Science - Question 9

There is no atmosphere on the moon because

Gravitation - Practice Test, Class 9 Science - Question 10

The period of geostationary artificial satellite is

Gravitation - Practice Test, Class 9 Science - Question 11

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

Detailed Solution for Gravitation - Practice Test, Class 9 Science - Question 11
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic energy and potential energy is negative.
Gravitation - Practice Test, Class 9 Science - Question 12

If the earth is 1/4th of its present distance from the sun, the duration of the year would be

Gravitation - Practice Test, Class 9 Science - Question 13

The period of a satellite in a circular orbit of radius R is T. The period of another satellite in circular orbit of radius 4R is

Gravitation - Practice Test, Class 9 Science - Question 14

Who among the following first gave the experimental velocity of G?

Gravitation - Practice Test, Class 9 Science - Question 15

Geo-stationary satellite

Gravitation - Practice Test, Class 9 Science - Question 16

The dimensions of universal gravitational constant are

Gravitation - Practice Test, Class 9 Science - Question 17

The radii of the earth and the moon are in the ratio 10 : 1 while acceleration due to gravity on the earth’s surface and moon’s surface are in the ratio 6 : 1. The ratio of escape velocities from earth’s surface to that of moon surface is

Gravitation - Practice Test, Class 9 Science - Question 18

When body is raised to a height equal to radius of earth, the P.E. change is

Gravitation - Practice Test, Class 9 Science - Question 19

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.

Detailed Solution for Gravitation - Practice Test, Class 9 Science - Question 19
Acc to law of gravitation : mg1=GM1m/R1^2
g1= GM1 / R1^2
( considering that for the first planet variables are placed with 1 and for the second with 2 )
Similarly g2 = G M2/R2^2
As we know that M2 is twice of M1 and R2 is twice of R1
So g2= G2M1/(2R1)^2
g1/g2 = G M1/R1^2 X 4R1^2/G2M1
g1:g2 = 4:2 = 2:1

Gravitation - Practice Test, Class 9 Science - Question 20

If g is the acceleration due to gravity of the earth’s surface the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth is

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