Motion Gravity

1. Who propounded the universal law of gravitation?

  1. Newton
  2. Galileo
  3. Copernicus
  4. Einstein

1.Newton

2. Astronaut is space cannot stand erect, This is because, in space

  1. There is no gravity
  2. Viscous forces of the atmosphere are very strong
  3. Solar wind exert an upward force
  4. Atmospheric pressure is very low

1.There is no gravity

3. Who among the following anticipated Newton by declaring that all things gravitate to the Earth ?

  1. Aryabhatta
  2. Varahamihira
  3. Buddha gupta
  4. Bhahma gupta

4.Brahma Gupta

4. Who gave the theory of gravity?

  1. Charles Newton
  2. Charles Babbage
  3. Isaac Newton
  4. John Adams

3. Isaac Newton

5. If an apple is released from an arbiting spaceship, it will

  1. Fall towards the Earth
  2. Move at a lower speed
  3. Move along with the spaceship at the same speed
  4. Move at a higher speed

3. Move along with the spaceship at the same speed

6. The learning Tower af Pisa does not fall because

  1. It is tapered at the top
  2. It covers a large base area
  3. It’s centre of gravity remains at the lowest position
  4. The vertical line through the centre of gravity of the tower falls within its base

4. The vertical line through the centre of gravity of the tower falls within its base

7. If the distance between the Earth and the sun were twice what it is now, the gravitational force exerted on the Earth by the sun would be

  1. Twice as large as it is now
  2. Four times as large as it is now
  3. One-fourth of what it is now
  4. Half of what it is now

3. One-fourth of what it is now

8. If an object is falling from above, it’s weight remains

  1. Zero
  2. Same
  3. Change
  4. None of these

2. Same

9. If pieces of equal size of woods, wax and iron falling from a same height, which one will reach the surface of the Earth first ?

  1. Wood
  2. Wax
  3. Iron
  4. Reach at the same time

4. Reach at the same time

10. The two balls of iron and wood of same weight dropped from the same height, then

  1. They reach the ground (Earth) at the same time
  2. One falls first, another falls later
  3. The wooden ball falls later
  4. They reach the ground after some gap

3. The wooden ball falls later

11. The weight of human body is

  1. Maximum at the poles
  2. Same at every place on the Earth surface
  3. Maximum at the equator
  4. More on the mountains than planes

1. Maximum at the poles

12. If the radius of the Earth were to shrink by one percent, it’s mass remaining the same, the value of g on the Earth’s surface would

  1. Increase by 0.5%
  2. Increase by 2%
  3. Decrease by 0.5%
  4. Decrease by 2%

2. Increase by 2%

13. Weightlessness is

  1. Zero gravity
  2. When gravity decrease
  3. In vacuum
  4. None of the above

1. Zero gravity

14. The Earth travels in its orbit at a speed of approx, 4,400 km per hour, Why do we not feel this high speed ?

  1. Because we are too small compared to the size of the Earth
  2. Our relative speed with respect to the Earth along the Earth’s orbit is zero
  3. The solar system as a whole is also moving
  4. The gravity of the Earth constantly pulls us towards the Earth centre

2. Our relative speed with respect to the Earth along the Earth orbit is zero

15. If the gravitational force of the Earth suddenly disappears, which are of the following will be the correct consequences?

  1. The weight of an object will become zero but the mass will remain the same
  2. The mass of the object will become zero but the weight will remain the same
  3. Both the mass and the weight of the object will become zero
  4. The mass of the object will increase

1. The weight of an object will become zero but the mass will remain the same

16. An artificial satellite orbiting around the Earth does not fall down, this is so because the attraction of Earth

  1. Does not exist at such distance
  2. Is neutralized by the attraction of the moon
  3. Provides the necessary speed for its steady motion
  4. Provides the necessary acceleration for its motion

4.Provides the necessary acceleration for its motion

17. A geosynchronous satelite continuous active in its orbit due to centrifugal force which is obtained by

  1. The rocket engine that propelled the satellite
  2. The gravitational force on the satellite by the Earth
  3. The gravitational force on the satellite by the sun
  4. The gravitational force on the Earth by satellite

2. The gravitational force on the satellite by the Earth

18. Satellite is kept moving in its orbit around the Earth, it is due to

  1. Centrifugal force
  2. Centripetal force
  3. Gravitational force or lack of it
  4. Some other forces

2. Centripetal force

19. If a person sitting in a lift, then when will he feel that his weight gets increased ?

  1. When the elevator going upward expeditiously
  2. When the elevator going down expeditiously
  3. Going upward with constant velocity
  4. Going downward with constant velocity

1. When the elevator going upward expeditiously

20. The time period of a pendulum

  1. Depands on the mass
  2. Depends on its length
  3. Depands on time
  4. Depands on temperature

2. Depands on its length

21. Why do pendulum checks usually lose time in summer

  1. Due to longer days in summer
  2. Due to friction caused by coils
  3. The length of the pendulum increase, increasing the time period of unit oscillation
  4. The weight of the pendulum change in summer

3. The length of the pendulum increase, increasing the time period of unit oscillation

22. A girl is swinging on a swing in sitting position, when the girl stands up, the period of the swing will

  1. Be shorter
  2. Be longer
  3. Depands on the height of the girl
  4. Not change

1. Be shorter

23. A pendulum clock can run faster in

  1. Summer
  2. Winter
  3. Sping season
  4. Rainy season

2. Winter

24. Earth’s escape velocity is

  1. 15.0 km/s
  2. 21.1 km/s
  3. 7.0 km/s
  4. 11.2 km/s

4. 11.2 km/s

25. What will happen if an object is thrown into space with the speed of 8 km/s ?

  1. The object will go into space
  2. It will return to earth
  3. It will rotate into the orbit of Earth
  4. It will burst out

2. It will return to earth

26. There is no atmosphere on the Moon because

  1. It is near to the Earth
  2. It receives light from the sun
  3. It revolves around the Earth
  4. The escape velocity of gas molecules on it is less than the root mean square velocity here

4. The escape velocity of gas molecules on it is less than the root mean square velocity here

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