Physics: Motion Under Gravity MCQ Quiz

Question 1. Who propounded the universal law of gravitation?

(A) Einstein

(B) Copernicus

(C) Galileo

(D) Newton

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

(A)Atmospheric pressure is very low

(B) Solar wind exert an upward force

(C) Viscous forces of the atmosphere are very strong

(D) There is no gravity

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

(A) Brahmagupta

(B) Buddhagupta

(C) Varahamihira

(D) Aryabhatta

Question 4. Who gave the theory of gravity? 

(A) John Adams

(B) Isaac Newton

(C) Charles Babbage

(D) Charles Newton

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

(A) Move at a higher speed

(B) Move along with the spaceship at the same speed

(C) Move at a lower speed

(D) Fall towards the Earth

Question 6.  The Leaning Tower of Pisa does not fall because?

(A) The vertical line through the centre of gravity of the tower falls within its base

(B) Its centre of gravity remains at the lowest position

(C) It covers a large base area

(D) It is tapered at the top

Question 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 __________.

(A) Half of what it is now

(B) One-fourth of what it is now

(C) Four times as large as it is now

(D) Twice as large as it is now

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

(A) Change

(B) Same

(C) Zero

(D) None of these

Question 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?

(A) Reach at the same time

(B) Iron

(C) Wax

(D) Wood

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

(A)  They reach the ground after some gap

(B) The wooden ball falls later

(C) One falls first, another falls later

(D) They reach the ground (Earth) at the same time

Question 11. A Geosynchronous satellite is continuously active in its orbit due to centrifugal force which is obtained by _______.

(A) The gravitational force on the Earth by satellite

(B) The gravitational force on the satellite by the Sun

(C) The gravitational force on the satellite by the Earth

(D) The rocket engine that propelled the satellite

Question 12. Satellite is kept moving in its orbit around the Earth; it is due to ?

(A) Some other forces

(B) Gravitational force or lack of it

(C) Centripetal force

(D) Centrifugal force

Question 13. The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them which one of the following statements is not correct?

(A) Strong nuclear force holds protons and neutrons inside the nucleus of an atom

(B) Weak nuclear force causes, radioactivity

(C) Electromagnetism acts only on particles with an electric charge

(D) Gravity is the strongest of the four

Question 14. If a person sitting in a lift, then when will he feel that his weight gets increased? 

(A) Going downward with constant velocity

(B) Going upward with constant velocity

(C) When the elevator going down expeditiously

(D) When the elevator going upward expeditiously

Question 15. A batsman hits a cricket ball which then rolls on level ground. After covering a short distance, the ball comes to rest. The ball slows to a  stop because?

(A) There is no unbalanced force on the ball, so the ball would try to come to rest

(B) There is a force on the ball opposing the motion

(C) Velocity is proportional to the force exerted on the ball

(D) The batsman did not hit the ball hard enough

Question 16. The time period of a pendulum?

(A) Depends on temperature

(B) Depends on time

(C) Depends on its length

(D) Depends on the mass

Question 17. Why do pendulum checks usually lose time in summer?

(A) The weight of the pendulum change in summer

(B) The length of the pendulum increases, increasing the time period of unit oscillation

(C) Due to friction caused by coils

(D) Due to longer days in summer

Question 18. A girl is swinging on a swing in sitting position. When the girl stands up, the period of the swing will?

(A)Be shorter

(B) Depends on the height of the girl

(C) Be longer

(D) Not change

Question 19. A pendulum clock can run faster in ________.

(A) Rainy season

(B) Spring season

(C) Winter

(D) Summer

Question 20. Earth’s escape velocity is ________.

(A) 11.2 km/s

(B) 7.0 km/s

(C) 21.1 km/s

(D) 15.0 km/s

Question 21. What will happen if an object is thrown into space with the speed of 8 km/s? 

(A) It will burst ou

(B) It will rotate into the orbit of Earth

(C) It will return to Earth

(D) The object will go into space

Question 22. There is no atmosphere on the Moon because?

(A) The escape velocity of gas molecules on it is less than the root mean square velocity here

(B)  It revolves around the Earth

(C) It receives light from the Sun

(D) It is near to the Earth

Question 23.

• Assertion(A): The weight of human being on the Moon is1/6 in comparison to Earth.
• Reason (R): The Moon does not have gravity like Earth.

Select the answer from the following codes. 

(A) (A) is false, but (R) is true

(B) (A) is true, but (R) is false

(C) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

(D) Both (A) and (R) are true and (R) is the correct explanation of (A)

Question 24. Which of the following pairs is correctly matched?

Code

Question 25. Consider the following statements. A Simple Pendulum is set into oscillation. Then,

1. the acceleration is zero when the bob passes through the mean position.
2. in each cycle, the bob attains a given velocity twice.
3. both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation.
4. the amplitude of oscillation of the simple pendulum decreases with time.

Which of these statements are correct?

(A) 2, 3 and 4

(B)  1, 2 and 4

(C) 3 and 4

(D) 1 and 2

Question 26. An artificial satellite orbiting around the Earth does not fall down. This is so because of the attraction of Earth?

(A) Provides the necessary acceleration for its motion

(B) Provides the necessary speed for its steady motion

(C) Is neutralized by the attraction of the Moon

(D) Does not exist at such distance

Question 27. If the gravitational force of the Earth suddenly disappears, which are of the following will be the correct consequence?

(A) The mass of the object will increase

(B) Both the mass and the weight of the object will become zero

(C) The mass of the object will become zero but the weight will remain the same

(D) The weight of an object will become zero but the mass will remain the same

Question 28. The Earth travels in its orbit at a speed of approx. 4,400 km per hour. Why do we not feel this high speed?

(A) The gravity of the Earth constantly pulls us towards the Earth’s centre

(B) The solar system as a whole is also moving

(C) Our relative speed with respect to the Earth along the Earth’s orbit is zero

(D) Because we are too small compared to the size of the Earth

Question 29.  Weightlessness is ________.

(A) Zero gravity

(B) In vacuum

(C) When gravity decrease

(D) None of the above

Question 30. The mass of a body on the Earth is 100 kg (acceleration due to gravity, ge = 10 m/s2 ). If acceleration due to gravity on the Moon is (ge = 106 m/s2 ), then the mass of the body on the Moon is?

(A)  600 kg

(B) 100 kg

(C) 60 kg

(D) 100/6 kg

Question 31.  The acceleration due to gravity of a destructive Earthquake will be ________.

(A)  >980 cm/s2

(B) >950 cm/s2

(C) >750 cm/s2

(D) >550 cm/s2

Question 32. 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?

(A)  Decrease by 2%

(B) Decrease by 0.5%

(C) Increase by 2%

(D) Increase by 0.5%

Question 33. A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s2 . What will be its velocity after 3 s? 

(A)  39.2 m/s

(B) 29.4 m/s

(C) 19.6 m/s

(D) 9.8 m/s

Question 34.  The weight of the human body is?

(A) More on the mountains than planes

(B) Maximum at the equator

(C) Same at every place on the Earth’s surface

(D) Maximum at the poles

Question 35.  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) A will reach the ground first

(B)Both A and B will reach the ground at the same time

(C) B will reach the ground first

(D) None of the above