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Class 12 Asmita Question Bank (Old is gold) science solutions

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Questions with solutions related physics class 11 and 12

QUESTIONS RELATED PHYSICS WITH PROPER SOLUTIONS OF CLASS 11 AND 12.   CONCEPTUAL QUESTIONS WITH ANSWERS 1. Which is more elastic, steel or rubber? Ans: Consider two identical wires, one steel and another rubber, suspended from rigid support. Suppose, equal masses are attached to the lower ends of each, therefore , tension in them is equal. We will find that the extension in the rubber thread is much greater than extension in steel wire. Since, Young's modulus is inversly proportional to the extension produced. Thus, magnitude of stress (Y*strain) for given value of strain is much larger in steel than in rubber. This means, if steel wire is deformed, large internal forces appear. In this sense, one can say that steel is more elastic than rubber. 2. Rubber pads are used as vibration absorber. Why? Ans: Rubber has large elastic hysteresis, i.e. workdone by a deforming force on deforming a rubber is greater than the workdone by the rubber in returning to its original shape. T...
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