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61. The petrol engine was invented by
A. James Watt
B. Nikolaus Otto
C. Rudolph Diesel
D. None of these
Explanation:
62. The mass of the body is different from its wight because
A. mass varies very little at different places, whereas weight varies a lot
B. mass is a variable quantity, whereas weight is constant
C. mass is a measure of the quantity of matter, whereas weight is a force
D. mass is constant but weight increases as the body moves from the Poles to the Equator
Explanation:
63. Who discovered that the earth was not the centre of the universe ?
A. Aristotle
B. Eratosthenes
C. Isaac Newton
D. Copernicus
Explanation:
64. Speed of sound is greater in solids than in liquids because
A. the atoms in solids are regularly arranged
B. the atoms in liquids are loosely packed
C. the solids have high elasticity
D. None of theese
Explanation:
65. Who invented the Lift ?
A. J.L. Baird
B. Thomas Alva Edison
C. E.G. Otis
D. Michael Faraday
Explanation:
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