Gravitational Potential Energy, Class 11 Physics NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Weight is

The force with which an object is pushed towards the centre of the Earth.

The force with which an object is pulled towards the centre of the Earth.

The force with which an object is pulled towards the centre of the Sun.

The energy with which an object is pulled towards the centre of the Earth.

Question 1 of 20

2. When a satellite moves in a circular orbit, the _______acceleration is provided by the gravitational attraction of the earth.

tangential

centrifugal

centripetal

fictitious

Question 2 of 20

3. An unmanned space probe is to the thrown with such a velocity that it does not return to earth. It should be thrown with

velocity >= (2GM/ R)^1/2

a great velocity but nothing more can be said

velocity >(2GM)^1/2/ R necessarily

only the velocity = (2GM)^1/2/R

Question 3 of 20

4. What could be the maximum value for gravitational potential energy?

zero

infinity

1000

Question 4 of 20

5. The value of escape velocity on earth when the body is thrown making an angle of 45o with the horizontal is

Question 5 of 20

6. The escape velocity for the moon is nearly

11.2km/s

2.4km/s

24km/s

10km/s

Question 6 of 20

7. A body is projected with velocity ‘v’ from a planet with escape velocity ‘v_e‘ .What will happen if v < v_e

Body will leave the planets atmosphere and never come back

Fall back on the planet

Will reach certain height and orbit around planet

Will reach certain height and orbit around planet or fall back on the planet

Question 7 of 20

8. If r represents the radius of the orbit of the satellite of mass m moving around planet of mass M the velocity v of satellite is given by

v = GM/r

v² = FMm/r

v = Gm/r

v²=GM/r

Question 8 of 20

9. Escape velocity is:

The minimum velocity with which the body has to be projected vertically upwards from the surface of the earth so that it crosses the gravitational field of earth and never returns back on its own.

The minimum velocity with which the body has to be projected vertically upwards from the surface of the earth so that it crosses the gravitational field of earth and returns back.

The maximum velocity with which the body has to be projected vertically upwards from the surface of the earth so that it crosses the gravitational field of earth and returns back.

The maximum velocity with which the body has to be projected vertically upwards from the surface of the earth so that it crosses the gravitational field of earth and never returns back on its own

Question 9 of 20

10. The gravitational potential due to the gravitational force on the earth is defined as the

potential energy multiplied by the mass of the object.

potential energy of the mass placed at that point.

numerically equal to the potential energy

potential energy of a unit mass at that point.

Question 10 of 20

11. A boy can jump 2 m on the surface of earth. How much can he jump on the surface of moon assuming that g on moon is 1/5 that of earth.

2/5 m

10 m

5 m

2 m

Question 11 of 20

12. The mass of the moon is 1/81 of earth’s mass and its radius 1/4 that of earth. If the escape velocity from the earth’s surface is 11.2 km/s ,its value for the moon…

5.0 km/s

2.5 km/s

0.5 km/s

0.14 km/s

Question 12 of 20

13. A body of mass m rises to a height h = R/5 from the earth’s surface where R is earth’s radius. If g is acceleration due to gravity , the increase in PE is

4mgh/5

5mgh/6

mgh

6mgh/7

Question 13 of 20

14. What is gravitational potential?

It is defined as the work done in taking a unit mass from one point to that point.

It is defined as the work done in taking 100kg mass from infinity to that point.

It is defined as the work done in taking a unit mass from infinity to that point.

It is defined as the energy spent in taking a unit mass from infinity to that point.

Question 14 of 20

15. Gravitational Potential is:

negative, scalar quantity , unit JKg^-1

positive, vector quantity , unit JKg^-1

positive, scalar quantity , unit JKg^-1

negative, vector quantity , unit JKg^-1

Question 15 of 20

16. An earth satellite is moved from one stable circular orbit to a farther stable circular orbit. which one of following quantity increases

gravitational potential energy

centripetal acceleration

gravitationl force

linear orbital speed

Question 16 of 20

17. What does the term escape speed of a planet mean?

the minimum speed of an object to reach a height equal to the radius of the planet

cannot be defined

the minimum speed required for an object to reach infinity

the maximum speed required for an object to reach infinity

Question 17 of 20

18. Escape velocity does not depend on:

Direction of projection of body

Mass and Direction of projection of body

Mass of the planet or earth

Mass of body

Question 18 of 20

19. Calculate the escape velocity on the surface of the planet of 5.3 x 1020 grams, with radius 1.3 x 105 m.

2.331x 10² cm/s

2.331x 10³ m/s

2.331x 10⁴ cm/s

2.331x 10³ cm/s

Question 19 of 20

20. The energy required to be spent by a satellite of mass m and speed v and orbital radius r in completing a circular orbit once round the earth of mass M is

GMm/r

2GMm/r

GMm/2r

zero

Question 20 of 20