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CBSE Test Paper 03, Chapter 11 Work and Energy, , J, One joule work is said to be done when (1), , a. a force of 1 N displaces a body by 1 cm, , b. a force of 1 dyne displaces a body by 1m, c. a force of 1 N displaces a body by 1m, , d. a force of 1 dyne displaces a body by 1 cm, , What happens to the kinetic energy of a freely falling object which eventually stops, , tS, , on reaching the ground? (1), , a. It changes in vibration energy, 4 b. It changes into heat & sound energy, c. It changes into electric energy, , d. It changes into light energy, , ae, wo, , . Amass m is moving in a circle of radius 1 m with a uniform speed of 5 m/s. The work, , done when its radius turns by 60° is (1), , a. zero, b. 10 joule, , c. 2.5 joule, , ILA, , d. 5 joule, , al, , Relative density of a substance is defined as the ratio of the density of the substance to, , >, , the density of water at____—«4), , ( a, 67, 1 b. 8°C, cy 4c, coe G, K. E of a body is always (1), , wn, , a. +ve, , OPPO AI5 - ©ankush sir, 2022/01/08 17:14