MHT CET 2026 20th April Morning Shift | Heat and Thermodynamics Question 11 | Physics

Gas at pressure P, temperature T, and volume V is filled in jar A. Another jar B is filled with gas having parameters $2P$, $\dfrac{V}{4}$, $2T$. The ratio of number of molecules of jar B to those of jar A is

$1:2$

$1:4$

$2:1$

$4:1$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

A black body has maximum wavelength ' $\lambda_{\mathrm{m}}$ ' at temperature 2000 K . Its maximum wavelength at 3000 K will be

$\frac{3}{2} \lambda_{\mathrm{m}}$

$\frac{16}{81} \lambda_m$

$\frac{81}{16} \lambda_m$

$\frac{2}{3} \lambda_m$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

The relation between efficiency $(\eta)$ of Carnot engine and coefficient of performance $\left(\eta_1\right)$ of refrigerator is

$\eta=\frac{1}{1+\eta_1}$

$\eta=\frac{1}{1-\eta_1}$

$\quad \eta=\frac{\eta_1}{1-\eta_1}$

$\eta=\frac{1+\eta_1}{\eta_1}$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

500 gram of a diatomic gas is enclosed at a pressure of $10^5 \mathrm{Nm}^{-2}$. The density of the gas is $5 \mathrm{kgm}^{-3}$. The energy of one mole of the gas due to its thermal motion is [consider the gas molecule as a rigid rotator]

$1.5 \times 10^4 \mathrm{~J}$

$2.5 \times 10^4 \mathrm{~J}$

$1.5 \times 10^7 \mathrm{~J}$

$2.5 \times 10^7 \mathrm{~J}$

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