1. **Who** propounded the universal law of gravitation?

- Newton
- Galileo
- Copernicus
- Einstein

**1.Newton**

## 2. Astronaut is 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

**1.There is no gravity**

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

- Aryabhatta
- Varahamihira
- Buddha gupta
- Bhahma gupta

**4.Brahma Gupta**

## 4. Who gave the theory of gravity?

- Charles Newton
- Charles Babbage
- Isaac Newton
- John Adams

**3. Isaac Newton**

## 5. If an apple is released from an arbiting 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

**3. Move along with the spaceship at the same speed**

## 6. The learning Tower af Pisa does not fall because

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

- 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

**3. One-fourth of what it is now**

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

- Zero
- Same
- Change
- 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 ?

- Wood
- Wax
- Iron
- 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

- 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

**3. The wooden ball falls later**

## 11. The weight of human body is

- Maximum at the poles
- Same at every place on the Earth surface
- Maximum at the equator
- 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

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

**2. Increase by 2%**

## 13. Weightlessness is

- Zero gravity
- When gravity decrease
- In vacuum
- 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 ?

- 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 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?

- 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

**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

- 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

**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

- 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

**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

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

**2. Centripetal force**

## 19. 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

**1. When the elevator going upward expeditiously**

## 20. The time period of a pendulum

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

**2. Depands on its length**

## 21. 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 increase, increasing the time period of unit oscillation
- 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

- Be shorter
- Be longer
- Depands on the height of the girl
- Not change

**1. Be shorter**

## 23. A pendulum clock can run faster in

- Summer
- Winter
- Sping season
- Rainy season

**2. Winter**

## 24. Earth’s escape velocity is

- 15.0 km/s
- 21.1 km/s
- 7.0 km/s
- 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 ?

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

**2. It will return to earth**

## 26. 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

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