# The period of revolution of earth about the sun is 365.256 days, approximately. The semi-major axis of the earth's orbit is close to $1.4953 \times 10^{11} \mathrm{~m}$. The semi-major axis of the orbit of Mars is $2.2783 \times 10^{11} \mathrm{~m} .$ The period of revolution of Mars, about the sun, is___________Earth days(in three decimal place)

## Question ID - 155563 :- The period of revolution of earth about the sun is 365.256 days, approximately. The semi-major axis of the earth's orbit is close to $1.4953 \times 10^{11} \mathrm{~m}$. The semi-major axis of the orbit of Mars is $2.2783 \times 10^{11} \mathrm{~m} .$ The period of revolution of Mars, about the sun, is___________Earth days(in three decimal place)

3537

Answer Key : (686.5 to 687.5) -

686.5 to 687.5

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Consider a system consisting of certain amount of perfect gas enclosed in a cylinder fitted with a frictionless piston. This system can undergo following processes
(i) Expansion with finite pressure difference with the surrounding.
(ii) Compression with infinitesimal pressure difference with the surrounding.
(iii) Heat transfer with finite temperature difference with the reservoir.
(iv) Heat transfer with infinitesimal temperature difference with the reservoir.
Out of these which processes are reversible?
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)