Q2221. A Geosynchronous satellite continuously active in its orbit due to centrifugal force which is obtained by
A The rocket engine that propelled the satellite B The gravitational force on the satellite by the Earth C The gravitational force on the satellite by the Sun D The gravitational force on the Earth by satellite
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Correct answer: The gravitational force on the satellite by the Earth
Q2222. An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth
A Does not exist at such distance B Is neutralized by the attraction of the Moon C Provides the necessary speed for its steady motion D Provides the necessary acceleration for its motion
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Correct answer: Provides the necessary acceleration for its motion
Q2223. If the gravitational force of the Earth suddenly disappears, which are of the following will be the correct consequence?
A The weight of an object will become zero but the mass will remain the same B The mass of the object will become zero but the weight will remain the same C Both the mass and the weight of the object will become zero D The mass of the object will increase
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Correct answer: The weight of an object will become zero but the mass will remain the same
Q2224. 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 Because we are too small compared to the size of the Earth B Our relative speed with respect to the Earth along the Earth’s orbit is zero C The solar system as a whole is also moving D The gravity of the Earth constantly pulls us towards the Earth’s centre
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Correct answer: Our relative speed with respect to the Earth along the Earth’s orbit is zero
Q2225. Weightlessness is
A Zero gravity B When gravity decrease C In vacuum D None of the above
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Correct answer: Zero gravity
Q2226. 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 100/6 kg B 60 kg C 100 kg D 600 kg
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Correct answer: 100 kg
Q2227. The acceleration due to gravity of a destructive Earthquake will be
A >550 cm/s2 B >750 cm/s2 C >950 cm/s2 D >980 cm/s2
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Correct answer: >980 cm/s2
Q2228. 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 Increase by 0.5% B Increase by 2% C Decrease by 0.5% D Decrease by 2%
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Correct answer: Increase by 2%
Q2229. 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 9.8 m/s B 19.6 m/s C 29.4 m/s D 39.2 m/s
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Correct answer: 29.4 m/s
General Science
English
Maharashtra PSC (Pre) 2017 UPPCS (Mains) 2009, 2015 UPPCS (Pre) 2006
Q2230. The weight of human body is
A Maximum at the poles B Same at every place on the Earth’s surface C Maximum at the equator D More on the mountains than planes
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Correct answer: Maximum at the poles
Q2231. 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 B will reach the ground first C Both A and B will reach the ground at the same time D None of the above
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Correct answer: Both A and B will reach the ground at the same time
Q2232. The two balls of iron and wood of same weight dropped from the same height, then
A They reach the ground (Earth) at the same time B One falls first, another falls later C The wooden ball falls later D They reach the ground after some gap
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Correct answer: The wooden ball falls later
Q2233. 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 Wood B Wax C Iron D Reach at the same time
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Correct answer: Reach at the same time
Q2234. If an object is falling from above, its weight remains
A Zero B Same C Change D None of these
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Correct answer: Same
Q2235. 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 Twice as large as it is now B Four times as large as it is now C One-fourth of what it is now D Half of what it is now
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Correct answer: One-fourth of what it is now
Q2236. The Leaning Tower of Pisa does not fall because
A It is tapered at the top B It covers a large base area C Its centre of gravity remains at the lowest position D The vertical line through the centre of gravity of the tower falls within its base
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Correct answer: The vertical line through the centre of gravity of the tower falls within its base
Q2237. If an apple is released from an orbiting spaceship, it will
A Fall towards the Earth B Move at a lower speed C Move along with the spaceship at the same speed D Move at a higher speed
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Correct answer: Move along with the spaceship at the same speed
Q2238. Who gave the theory of gravity?
A Charles Newton B Charles Babbage C Isaac Newton D John Adams
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Correct answer: Isaac Newton
Q2239. Who among the following anticipated Newton by declaring that all things gravitate to the Earth?
A Aryabhatta B Varahamihira C Buddhagupta D Brahmagupta
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Correct answer: Brahmagupta
Q2240. Astronauts in space cannot stand erect. This is because, in space
A There is no gravity B Viscous forces of the atmosphere are very strong C Solar wind exert an upward force D Atmospheric pressure is very low
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Correct answer: There is no gravity