MHT CET 2024 3rd May Morning Shift | Heat and Thermodynamics Question 79 | Physics

Given that ' $x$ ' joule of heat is incident on a body. Out of that, total heat reflected and transmitted is ' $y$ ' joule. The absorption coefficient of body is

$\frac{x}{y}$

$\frac{y}{x}$

$\frac{x-y}{x}$

$\frac{y-x}{x}$

MHT CET 2024 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

A diatomic ideal gas is used in Carnot engine as a working substance. If during the adiabatic expansion part of the cycle, the volume of the gas increases from V to 32 V , the efficiency of the engine is

0.25

0.50

0.75

0.90

MHT CET 2024 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

Two spherical black bodies of radii ' $R_1$ ' and ' $\mathrm{R}_2$ ' and with surface temperature ' $\mathrm{T}_1$ ' and ' $\mathrm{T}_2$ ' respectively radiate the same power. The ratio of ' $R_1$ ' to ' $R_2$ ' will be

$\left(\frac{T_2}{T_1}\right)^4$

$\left(\frac{T_2}{T_1}\right)^2$

$\left(\frac{T_1}{T_2}\right)^4$

$\left(\frac{T_1}{T_2}\right)^2$

MHT CET 2024 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

Rate of flow of heat through a cylindrical rod is ' $\mathrm{H}_1$ '. The temperature at the ends of the rod are ' $T_1$ ' and ' $T_2$ '. If all the dimensions of the rod become double and the temperature difference remains the same, the rate of flow of heat becomes ' $\mathrm{H}_2$ '. Then

$\mathrm{H}_2=4 \mathrm{H}_1$

$\mathrm{H}_2=2 \mathrm{H}_1$

$\mathrm{H}_2=\frac{\mathrm{H}_1}{2}$

$\mathrm{H}_2=\frac{\mathrm{H}_1}{4}$

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