An elastic string of force constant 200N m-1 is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string.
A. 64.0J B. 80.0J C. 128.0J D. 160.0J Correct Answer: Option A A. 64.0J Explanation E = ½Ke² = ½×200(0.8)² =64JOn which of the following factor does the viscosity of a liquid depend?
i. Nature of the liquid. ii. Temperature of the liquid. iii. Area of the liquid surface A. i and ii only B. ii and iii only C. i and iii only D. i, ii and iii Correct Answer: Option D D. i, ii and iiiA steel needle floating on water, sinks when kerosene is added to the water. This is because the kerosene
A. increased the surface tension of the water B. reduces the density of the water C. reduces the surface tension of the water D. reduces the upthrust on the needle Correct Answer: Option C C. reduces the surface tension of the...Which of the following concept is not an evidence of the particle nature of matter?
A. diffusion B. brownian motion C. diffraction D. crystallization Correct Answer: Option D D. crystallizationThe diagram below represents displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave
A. 20 Hz B. 10 Hz C. 5 Hz D. 4 Hz Correct Answer: Option B B. 10 HzProducts
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