7 Gravitation

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7 Gravitation

Prepared by Vinodkumar M, HSST Physics, St. Aloysius HSS, Elthuruth, Thrissur

1. The value of acceleration due to gravity is maximum at the *

1 point

Poles

Centre of earth

Equator

2. The height at which g is reduced to g / 2 ..............(There may be more than one answers) *

2 points

0.414 R

0.2 R

0.5 R

0.25 R

3. A rat and horse are to be projected to space from earth. Choose the correct alternative *

1 point

Rat should be projected with a velocity greater than that of horse

Horse should be projected with a velocity greater than that of rat

Both can be projected with the same velocity equal to escape velocity

4. Relation connection connecting orbital and escape velocity *

1 point

They are not related

Orbital velocity = √2 x escape velocity

Orbital velocity = esacpe velocity

Escape velocity = √2 x orbital velocity

5. Escape speed of an object from the earth

1 point

11.2 km /s

11.2 m/s

7.85 km /s

7.85 m/s

Clear selection

6. The earth contains an atmosphere but the moon does not because.............. *

0 points

Escape velocity of moon is too large

Escape velocity of earth is small

Escape velocity of moon is too small

No connection with escape velocity

7. Time period of a simple pendulum inside a satellite orbiting earth is.........(Period on earth = T) *

2 points

zero

infinity

8. As height increases, the acceleration due to gravity *

1 point

no change

increases

decreases

9. When a body is taken to a depth, its acceleration due to gravity *

1 point

decreases

no change

increases

10. The relation between acceleration due to gravity g and gravitational constant G is ......... *

1 point

g = GM/R

g = GM/R^2

g = GM/R^3

g = G

11. The graph showing the variation of g with depth and height from the surface of earth assuming density of earth is constant *

2 points

12. An earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers directly over the equator, that revolves in the same direction the earth rotates (west to east). *

1 point

Polar satellite

Drone satellite

Geostationary satellite

Ground satellite

13. Moon has no atmosphere because *

1 point

None of these

No g and escape velocity on moon

The value of g and escape velocity on moon is small

The value of g and escape velocity is on moon is large

14. Distance to the moon from earth is 3.84 x 10^8 m and the time period of moon's revolution is 27.3 days. Obtain the mass of the earth. (Gravitational constant, G = 6.67 x 10^-11 Nm^2 / kg^2) *

2 points

6 x 10^27 kg

6.67 x 10^24 kg

3.84 x 10^24 kg

6 x 10^24 kg

15. Why does satellite need no fuel to go around a planet in its fixed orbit? *

1 point

No centripetal force is required for the satellite

Gravitational force provides the centripetal force for the satellite

The satellite takes fule from the sun

The satellite already has energy in it

16. Acceleration due to gravity is independent of ........... *

1 point

Mass of body

Mass of earth

17. For a particle to overcome the gravitational pull of the earth, it is projected with a minimum velocity called................ *

1 point

Earth's velocity

Escape velocity

Orbital velocity

Fist cosmic velocity

18. A ball bounces more on the surface of the moon than on the earth because *

1 point

Option 4

the acceleration due to gravity / gravitational force is larger on moon compared to earth

the acceleration due to gravity / gravitational force is smaller on moon compared to earth

Moon has no gravity

19. For a planet revolving around the sun, the areal velocity is a constant. This is ............ *

1 point

Kepler's second law

Kepler's third law

Kepler's first law of planetary motion

20. The escape velocity of a planet is 20 km /s. The orbital velocity of the smallest possible orbit is ....... *

2 points

0.1414 km/s

1.414 km/s

14.14 km/s

141.4 km/s

21. An artificial satellite orbiting the earth is at a height of 3400 km from the surface of the earth. If the radius of earth is 6400 km, and g = 9.8 m/s^2, the orbital velocity of the satellite is ............... *

3 points

640 m/s

6850 m/s

12800 m/s

6400 m/s

22. Energy possessed by a body due to gravitational field of earth is ............ *

1 point

None of these

Gravitational field

Gravitational constant

Gravitational potential energy

23. The maximum value of gravitational potential is *

2 points

Infinite

One

Between one and zero

Zero

Submit

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