NEB CLASS 12 SCIENCE SOLUTIONS

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...

Firstly i wanted to tell you if u have some questions to ask please comment down it is 24 hours service with all correct answer of all subjects and classes. Thank you Asmita's Question Bank                        Old Is Gold Class 12 UNIT-1.            WAVES AND OPTICS     A. WAVE MOTION SHORT ANSWER QUESTIONS 1. We can't hear echo in a small room.Why? Ans: We can't hear echo in a small room because in the sound can'tbe reflected back. For an echo of a sound to be heard, the minimum distance between the source of sound and the walls of the room should be 17.2m. Obviously, in a small room echoes cannot ve heard. 2. Frequency is the most fundamental property of a wave.Why? Ans: As when a wave travels from one medium to another medium, wacelength and the speed of the wave changes whereas frequency remains unchanged.So, frequency is the most fundamental prope...