MHT CET 2025 19th April Evening Shift | Heat and Thermodynamics Question 28 | Physics

If r.m.s. velocity of hydrogen molecules is 4 times that of an oxygen molecule at $47^{\circ} \mathrm{C}$, the temperature of hydrogen molecules is (Molecular weight of Hydrogen and Oxygen are 2 and 32 respectively)

$23^{\circ} \mathrm{C}$

$47^{\circ} \mathrm{C}$

$80^{\circ} \mathrm{C}$

$114^{\circ} \mathrm{C}$

MHT CET 2025 19th April Evening Shift

MCQ (Single Correct Answer)

-0

A monoatomic ideal gas is heated at constant pressure. The percentage of total heat used in increasing the internal energy and that used for doing external work is $A$ and $B$ respectively. Then the ratio, $\mathrm{A}: \mathrm{B}$ is

$5: 3$

$2: 3$

$3: 2$

$2: 5$

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

-0

Black sphere of radius R radiates power P at certain temperature $T$. If the temperature is doubled, the radius gets doubled. Now the power radiated would be

4 P

8 P

16 P

64 P

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

-0

Three samples $X, Y$, and $Z$ of same gas have equal volumes and temperatures. The volume of each sample is doubled, the process being isothermal for X , adiabatic for Y and isobaric for Z . If the final pressures are equal for the three samples, the ratio of the initial pressures is ( $\gamma=3$ / 2)

$1: \sqrt{2}: 2 \sqrt{3}$

$2: 2 \sqrt{2}: 1$

$3: 3 \sqrt{3}: 1$

$5: 5 \sqrt{5}: 1$

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