Motion Under Gravity One Liner Questions & Answers
| Questions | Answers | |
| 1 | Who among the following anticipated Newton by declaring that all things gravitate to the earth? | Brahmagupta |
| 2 | Who gave the theory of gravity? | Isaac Newton |
| 3 | Who propounded the universal law of gravitation? | Newton |
| 4 | Astronauts in space can not stand erect. This is because in space – | There is no gravity |
| 5 | If an apple is released from an orbiting spaceship, it will – | Move along with the spaceship at the same speed |
| 6 | The Leaning Tower of Pisa does not fall because – | The vertical line through the center 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 – | One-fourth of what it is now |
| 8 | If an object is falling from above, its weight remains – | Same |
| 9 | If pieces of equal size of wood, wax, and iron fall from the same height, which one will reach the surface of the earth first? | Reach at the same time |
| 10 | The two balls of iron and wood of the same weight dropped from the same height in air, then – | The wooden ball falls later. |
| 11 | The weight of human body is – | Maximum at the poles. |
| 12 | 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 seconds? | 29.4 m/s |
| 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 2% |
| 14 | The acceleration due to the gravity of a destructive earthquake will be – | > 980 cm/sec² |
| 15 | The mass of a body on the Earth is 100 kg (acceleration due to gravity, ge= 10m/s2 ). If acceleration due to gravity on the Moon is ( ge/6), then the mass of the body on the Moon is – | 100 kg |
| 16 | Weightlessness is – | Zero gravity |
| 17 | The Earth travels in its orbit at a speed of approx 4,400 km per hour. Why do we not feel this high speed? | Our relative speed with respect to the Earth along the Earth’s orbit is zero. |
| 18 | An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth – | Provides the necessary acceleration for its motion |
| 19 | Satellite is kept moving in its orbit around the Earth; it is due to – | Centripetal force |
| 20 | A Geosynchronous satellite continuously active in its orbit due to centripetal force which is obtained by – | The gravitational force on the satellite by the earth. |
| 21 | If a person sitting in a lift then when will he feel that his weight gets increased? | When the elevator going upward expeditiously |
| 22 | The time period of a pendulum – | Depends on its length |
| 23 | Why do pendulum clocks usually lose time in summer? | The length of the pendulum increases, increasing the time period of unit oscillation. |
| 24 | A girl is swinging on a swing in sitting position. When the girl stands up, the period of the swing will – | Be shorter |
| 25 | A pendulum clock can run faster in – | Winter |
| 26 | Earth’s escape velocity is – | 11.2 km/sec. |
| 27 | What will happen if an object is thrown into space with the speed of 8 km/sec.? | It will return to earth |
| 28 | There is no atmosphere on the moon because – |
The escape velocity of gas molecules on it is less than the root mean square velocity here.
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| 29 | In the state of weightlessness, the size of candle’s fame will be – | Spherical |