# Online MCQ Test For Class 11 Physics Chapter 8 Gravitation

One of the most basic forces that occur between objects is gravity.  This force is attractive in nature. The term gravity is used to describe gravitation. Gravitation is the theory that explains this force of attraction, whereas gravity is defined as the force that attracts objects together. The gravitational force like other forces is measured in Newtons.
The gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of their distance.

## Gravitation Class 11 Multiple Choice Questions with Answers

General Instructions

1. Your test contains multiple-choice questions with only one answer type of questions. There are a total of 25 questions
2. This is a 45 min test. Please make sure you complete it in the stipulated time
3. You can finish this test any time using the 'Submit' button.

1. An artificial satellite moving in a circular orbit around the Earth has total (Kinetic Energy+ Potential) energy $E_0$
2. A satellite is moving with a constant speed $v$ in a circular orbit about the Earth. An object of mass $m$ is ejected from the satellite such that it just escapes the gravitational pull of the Earth. At the time of ejection Kinetic energy of the object is
3. If suddenly the gravitational force of attraction between earth and satellite revolving around it becomes zero, then the satellite will
4. The average density of the earth
5. The time period of an earth satellite in circular orbit is independent of
6. The following question contains statement – 1 and statement – 2. Of the four choices given choose the one that best describes the two statements.
Statement 1: For a mass M kept at the center of a cube of side $a$, the flux of gravitational field passing through its sides is $4\pi GM$
Statement 2: If the direction of a field due to a point source is radial and its dependence on the distance r from the source is given as $\frac{1}{r^2}$, its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface.
7. If the earth stops rotating, the value of g at the equator
8. When a body is lifted from surface of earth to a height equal to radius of earth, then the change in potential energy is
9. What is not conserved in the case of celestial bodies revolving around sun?
10. Satellite is revolving around earth. If its height is increased to four times height of geostationary satellite, what will become its time period?
11. Two satellites A and B have ratio of masses 3:1 in circular orbits of radii r and 4r. The ratio of total mechanical energy of A to B is
12. Kepler discovered
13. According to Kepler’s law, the time period of a satellite varies with its radius as
14. When a body is taken from poles to equator on the earth, its weight
15. Two planets of radii $r_1$ and $r_2$ are made from the same material. The ratio of the acceleration of gravity $g_1/g_2$ at the surfaces of the planets is
16. The escape velocity from the earth is 11.2 Km/s. The escape velocity from a planet having twice the radius and the same mean density as the earth is
17. If v be the orbital velocity of a satellite in a circular orbit close to earth’s surface and $v_e$ is the escape velocity from the earth, then relation between two is
18. Two particles of equal mass go around a circle of radius R under the action of mutual gravitational attraction. The speed v of each particle is
19. The acceleration due to gravity g and mean density of earth \rho are related by which of following relations? (Where G is the gravitational constant and R is the radius of the earth)
20. The largest and the shortest distances of the earth from the sun are $r_1$ and $r_2$. Its distance from the sun when it is perpendicular to the major axis of the orbit drawn from the sun is
21. The distances of two planets from the sun are $10^{13}m$ and $10^{12}m$ respectively. The ratio of time periods of the planet is
22. The escape velocity from the earth is 11.2 Km/s. If a body is to be projected in a direction making an angle ${45}^0$ to the vertical, then the escape velocity is
23. The mean radius of earth is R, its angular speed on its own axis is $\omega$ and the acceleration due to gravity at earth’s surface is g. What will be the radius of the orbit of a geostationary satellite?
24. Two satellites of earth $S_1$ and $S_2$ are moving in the same orbit. The mass of $S_1$ is four times the mass of $S_2$. Which one of the following statements is true?
25. The radii circular orbits of two satellites A and B of earth are 4R and R, respectively. If the speed of satellite A is 3V, the speed of satellite B will be

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