Online MCQ Test For Class 11 Physics Chapter 8 Gravitation

class 11 physics

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

Your test contains multiple-choice questions with only one answer type of questions. There are a total of 25 questions
This is a 45 min test. Please make sure you complete it in the stipulated time
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 $E_0$

$-E_0$

$1.5E_0$

$2E_0$

$E_0$

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

$\frac{1}{2}mv^2$

$ mv^2$

$\frac{3}{2}mv^2$

$2mv^2$

3. If suddenly the gravitational force of attraction between earth and satellite revolving around it becomes zero, then the satellite will

continue to move in orbit with the same velocity

move tangentially to the original orbit with the same velocity.

becomes stationary in its orbit

moves towards the earth

4. The average density of the earth

does not depend on g

is a complex function of g

is directly proportional to g

is inversely proportional to g

5. The time period of an earth satellite in circular orbit is independent of

the mass of the satellite

the radius of its orbit

both mass and radius of the orbit

neither mass of the satellite nor the radius of its orbit.

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.

Statement – 1 is true, and Statement – 2 is false

Statement – 1 is false, and Statement – 2 is true

Statement – 1 is true and Statement – 2 is false. Statement 2 is the correct explanation of statement 1

Statement – 1 is true and Statement – 2 is true. Statement 2 is not a correct explanation of statement 1.

7. If the earth stops rotating, the value of g at the equator

increases

decreases

no effect

none of these

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

$mgR$

$2mgR$

$\frac{1}{2}mgR$

$ 4mgR$

9. What is not conserved in the case of celestial bodies revolving around sun?

kinetic energy

mass

angular momentum

linear momentum

10. Satellite is revolving around earth. If its height is increased to four times height of geostationary satellite, what will become its time period?

8 days

4 days

2 days

16 days

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

1:3

3:1

3:4

12:1

12. Kepler discovered

laws of motion

laws of rotational motion

laws of planetary motion

laws of curvilinear motion

13. According to Kepler’s law, the time period of a satellite varies with its radius as

$T^2\propto R^3$

$T^3\propto R^2$

$T^2\propto\frac{1}{R^3}$

$T^3\propto\frac{1}{R^2}$

14. When a body is taken from poles to equator on the earth, its weight

increases

decreases

remains the same

increases at the south pole and decreases at the north pole.

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

$r_1/r_2$

$ r_2/r_1$

$(r_1/r_2)^2$

$(r_2/r_1)^2$

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

22.4 Km/s

11.2 Km/s

5.5 Km/s

15.5 Km/s

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

$v_e = v$

$v_e = \sqrt{2}v$

$v_e = \sqrt{3}v$

$v_e = 2v$

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

$\frac{1}{2}\sqrt{\frac{Gm}{R}}$

$\sqrt{\frac{4Gm}{R}}$

$\frac{1}{2R}\sqrt{\frac{1}{Gm}}$

$\sqrt{\frac{Gm}{R}}$

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)

$\rho=\frac{3g}{4\pi G R}$

$\rho=\frac{3g}{4\pi G R^3}$

$\rho=\frac{4\pi G R^2}{3G}$

$\rho=\frac{4\pi G R^3}{3G}$

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

$\frac{r_1+r_2}{4}$

$ \frac{r_1+r_2}{r_1-r_2}$

$\frac{2r_1r_2}{r_1+r_2}$

$\frac{r_1+r_2}{3}$

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

$\sqrt{10}$

$10\sqrt{10}$

$10$

$\frac{1}{\sqrt{10}}$

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

$11.2\ \times2\ Km/s$

$11.2\ Km/s$

$\frac{11.2}{\sqrt2}Km/s$

$11.2\sqrt2\,Km/s$

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?

$\left(\frac{R^2g}{\omega^2}\right)^{1/3}$

$ \left(\frac{Rg}{\omega^2}\right)^{1/3}$

$\left(\frac{R^2\omega^2}{g}\right)^{1/3}$

$\left(\frac{R^2g}{\omega}\right)^{1/3}$

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?

The potential energies of earth and satellite in the two cases are equal

$S_1$ and $S_2$ are moving with the same speed

The Kinetic energies of two satellites are equal

The time period of $S_1$ is four times that of $S_2$

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

3V/4

12V

3V/2

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Gravitation Class 11 Multiple Choice Questions with Answers

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