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.
29 In the state of weightlessness, the size of candle’s fame will be – Spherical