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HomePhysics11. The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. P and Q represent

11. The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. P and Q represent

(a)   P = applied force, Q = extension

(b)   P = extension, Q = applied force

(c)   P = extension, Q = stored elastic energy

(d)   P = stored elastic energy, Q = extension

Answer-c

(10)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is

(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (126)

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