In railway tracks, a small gap is left between the rails?
Correct answer C. To allow for the expansion during heat
Tip: press A, B, C or D to answer, and N for the next question.
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See allThree equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f?
Correct answer B. 90W
Fundamental frequency of stationary waves in open pipe is ____ times the frequency in closed pipe?
Correct answer B. Two
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Laplace found that the alternate compressions and rarefactions produced in sound waves follows?
Correct answer B. adiabatic law
Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are?
Correct answer D. both A and C
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