Heat & Thermodynamics · JEE Main previous year questions

2006 2 questions

1. Q542006 · 29 Apr 2006 · Shift 1

   Assuming the Sun to be a spherical body of radius $R$ at a temperature of $TK$, evaluate the total radiant power incident on Earth at a distance $r$ from the Sun Where $r_0$ is the radius of the Earth and $\sigma$ is Stefan's constant.

   1. A.$4\pi r_0^2{R}^2\sigma \frac{T^4}{r^2}$
   2. B.$\pi r_0^2{R}^2\sigma \frac{T^4}{r^2}$
   3. C.$r_0^2{R}^2\sigma \frac{T^4}{4\pi r^2}$
   4. D.$R^2\sigma \frac{T^4}{r^2}$
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   Answer: B

2. Q562006 · 29 Apr 2006 · Shift 1

   The work of $146kJ$ is performed in order to compress one kilo mole of gas adiabatically and in this process the temperature of the gas increases by $7^{\circ }C$. The gas is $(R=8.3Jmo{l}^{-1}{K}^{-1})$

   1. A.diatomic
   2. B.triatomic
   3. C.a mixture of monoatomic and diatomic
   4. D.monoatomic
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   Answer: A