If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?
A. 4 B. π2 C. 14 D. 2 Correct Answer: Option D = 2
Which of the following statements about radioactivity is true?
(i) Alpha particle is positively charged (ii) Beta particle is negatively charged (iii) Gamma ray is neutral (iv) Beta particle has the same mass as helium atom (v) Gamma ray is charged. A. i, ii, iii, iv only B. i, ii, iii only C. iv and v only D. i, ii and v only...
A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms¯¹. The recoil speed of the machine gun is
A. 0.5 ms−1 B. 1.5 ms−1 C. 1 ms−1 D. 2 ms−1 Correct Answer: Option C = 1 ms−1 Explanation Gun Momentum = bullet momentum MaVa = MbVb 5 x Va = 0.05 x 100 Va = 1m−1
A few grains of table salt were put in a cup of cold water; kept at constant temperature and left undistributed. Eventually all the water tested salty. This action is due to?
A. convection B. osmosis C. capillarity D. diffusion Correct Answer: Option D = diffusion Explanation Diffusion is the tendency of molecules to migrate and fill an empty space due to their random thermal motions. in diffusion, the diffusing molecules move from the...
The force required to make an object of mass m; travelling with velocity v; turn in a circle of radius r is?
A. mv2/r B. mr2/x C. m/rv D. mv/r2 Correct Answer: Option A = mv2/rProducts
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