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Free Online Mock Physics Multiple Choice Test on workenergy power
Sub Category : workenergy power Test : 3 Time Left :
1)A particle is moving in a horizontal circle with a constant speed. Which of the following remains constant?
(1) kinetic energy of the body (2) momentum of the body (3) radial acceleration (4) displacement of the body from the centre of the circle.
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2) A body is displaced from x = x1 to x = x2 by a force 2x. The work done is (1)(x2 – x1)2 (2) x22-x12 (3) 2x2(x2 – x1) (4) 2x1(x2 – x1).
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3)A force 4 N acts through a distance of 11 m in the direction of the force. The work done is
(1) 10 J (2) 11 J (3) 15 J (4) 44 J.
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4) When a 4 kg mass is hung vertically on a light spring that obeys Hookes law, the spring stretches by 2 cm. The work required to be done by an external agent in stretching this spring by 5 cm will be (g = 9.8m s-2)(1) 4.900 J (2) 2.450 J (3) 0.495 J (4) 0.245 J
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5) A force F=(5i+3j)newton is applied over a particle which displaces it from its origin to the point r=(2i-1j) metre. The work done on the particle is (1) -7 J (2) +13 J (3) +7 J (4) +11 J.
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