MHT CET 2024 3rd May Morning Shift | Heat and Thermodynamics Question 78 | Physics

Two rods, one of aluminium and the other of steel, having initial lengths ' $\mathrm{L}_1$ ' and ' $\mathrm{L}_2$ ' are connected together to form a single rod of length $\left(L_1+L_2\right)$. The coefficients of linear expansion of aluminium and steel are ' $\alpha_1$ ' and ' $\alpha_2$ ' respectively. If the length of each rod increases by the same amount, when their temperatures are raised by $\mathrm{t}^{\mathrm{L}} \mathrm{C}$, then the ratio $\frac{L_1}{L_1+L_2}$ will be

$\frac{\alpha_2}{\alpha_1}$

$\frac{\alpha_1}{\alpha_2}$

$\frac{\alpha_2}{\alpha_1+\alpha_2}$

$\frac{\alpha_1}{\alpha_1-\alpha_2}$

MHT CET 2024 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

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

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

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

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

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

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