General Science | Physics | Motion Under Gravity

General Science | Physics | Motion Under Gravity

Dec 28, 2024 - 14:32 Updated: Dec 28, 2024 - 14:48
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1. Who propounded the universal law of gravitation?

Newton
Galileo
Copernicus
Einstein

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

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

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

Aryabhatta
Varahamihira
Buddhagupta
Brahmagupta

4. Who gave the theory of gravity?

Charles Newton
Charles Babbage
Isaac Newton
John Adams

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

Fall towards the Earth
Move at a lower speed
Move along with the spaceship at the same speed
Move at a higher speed

6. The Leaning Tower of Pisa does not fall because

It is tapered at the top
It covers a large base area
Its centre of gravity remains at the lowest position
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

Twice as large as it is now
Four times as large as it is now
One-fourth of what it is now
Half of what it is now

8. If an object is falling from above, its weight remains

Zero
Same
Change
None of these

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?

Wood
Wax
Iron
Reach at the same time

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

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

11. Two balls A and B are of 10 kg and 1 kg, respectively. They are dropped simultaneously from a height of 20 m. Which of the following is correct?

A will reach the ground first
B will reach the ground first
Both A and B will reach the ground at the same time
None of the above

12. The weight of human body is

Maximum at the poles
Same at every place on the Earth's surface
Maximum at the equator
More on the mountains than planes

13. If the radius of the Earth were to shrink by one percent, its mass remaining the same, the value of g on the Earth's surface would

Increase by 0.5%
Increase by 2%
Decrease by 0.5%
Decrease by 2%

14. Weightlessness is

Zero gravity
When gravity decrease
In vacuum
None of the above

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

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

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

The weight of an object will become zero but the mass will remain the same
The mass of the object will become zero but the weight will remain the same
Both the mass and the weight of the object will become zero
The mass of the object will increase

17. An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth

Does not exist at such distance
Is neutralized by the attraction of the Moon
Provides the necessary speed for its steady motion
Provides the necessary acceleration for its motion

18. A Geosynchronous satellite continuously active in its orbit due to centrifugal force which is obtained by

The rocket engine that propelled the satellite
The gravitational force on the satellite by the Earth
The gravitational force on the satellite by the Sun
The gravitational force on the Earth by satellite

19. Satellite is kept moving in its orbit around the Earth; it is due to

Centrifugal force
Centripetal force
Gravitational force or lack of it
Some other forces

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

When the elevator going upward expeditiously
When the elevator going down expeditiously
Going upward with constant velocity
Going downward with constant velocity

21. A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

The batsman did not hit the ball hard enough
Velocity is proportional to the force exerted on the ball
There is a force on the ball opposing the motion
There is no unbalanced force on the ball, so the ball would try to come to rest

22. The time period of a pendulum

Depends on the mass
Depends on its length
Depends on time
Depends on temperature

23. Why do pendulum checks usually lose time in summer?

Due to longer days in summer
Due to friction caused by coils
The length of the pendulum increases, increasing the time period of unit oscillation
The weight of the pendulum change in summer

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

Be shorter
Be longer
Depends on the height of the girl
Not change

25. A pendulum clock can run faster in

Summer
Winter
Spring season
Rainy season

26. Earth's escape velocity is

15.0 km/s
21.1 km/s
7.0 km/s
11.2 km/s

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

The object will go into space
It will return to Earth
It will rotate into the orbit of Earth
It will burst out

28. There is no atmosphere on the Moon because

It is near to the Earth
It receives light from the Sun
It revolves around the Earth
The escape velocity of gas molecules on it is less than the root mean square velocity here