AIEEE 2007 | Heat and Thermodynamics Question 369 | Physics

Assuming the Sun to be a spherical body of radius $$R$$ at a temperature of $$TK$$, evaluate the total radiant powered incident of Earth at a distance $$r$$ from the Sun

Where r₀ is the radius of the Earth and $$\sigma $$ is Stefan's constant.

$$4\pi r_0^2{R^2}\sigma {{{T^4}} \over {{r^2}}}$$

$$\pi r_0^2{R^2}\sigma {{{T^4}} \over {{r^2}}}$$

$$r_0^2{R^2}\sigma {{{T^4}} \over {4\pi {r^2}}}$$

$${R^2}\sigma {{{T^4}} \over {{r^2}}}$$

AIEEE 2006

MCQ (Single Correct Answer)

-1

The work of $$146$$ $$kJ$$ 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 $$\left( {R = 8.3J\,\,mo{l^{ - 1}}\,{K^{ - 1}}} \right)$$

diatomic

triatomic

a mixture of monoatomic and diatomic

monoatomic

AIEEE 2006

MCQ (Single Correct Answer)

-1

Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature $${T_0},$$ while Box contains one mole of helium at temperature $$\left( {{7 \over 3}} \right){T_0}.$$ The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes). Then, the final temperature of the gases, $${T_f}$$ in terms of $${T_0}$$ is

$${T_f} = {3 \over 7}{T_0}$$

$${T_f} = {7 \over 3}{T_0}$$

$${T_f} = {3 \over 2}{T_0}$$

$${T_f} = {5 \over 2}{T_0}$$

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