An object is moving at a steady speed ?v? along a circular
path of radius ?r?. The angular acceleration of the object
will be
(a) vr
(b) v/r
(c) zero
(d) v2/r
Which of the following electromagnetic waves has longest wavelength? (1) Infra-red (2) Light-rays (3) Ultra-violet (4) Gamma rays
Absolute zero corresponds to (a) ? 2730K (b) ? 2730C (c) 2730C (d) ? 2730F
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Which planet is closest to the sun? (a) Venus (b) Mercury (c) Uranus (d) None of these
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A train covers distances 10 km, 20 km and 20 km at 90 km/hr. The average speed of the train in km/hr is approximately (a) 52 (b) 60 (c) 69 (d) 66
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Which of the following is the largest lake in the world? (1) Superior (2) Baikal (3) Chilka (4) Caspian Sea