MHT CET 2025 26th April Evening Shift | Heat and Thermodynamics Question 11 | Physics

A black sphere has radius $R$ whose rate of radiation is E at temperature T . If radius is made R / 2 and temperature 3T, the rate of radiation will be

$\frac{3 \mathrm{E}}{2}$

$\frac{27 \mathrm{E}}{8}$

$\frac{81 \mathrm{E}}{4}$

$\frac{9 \mathrm{E}}{4}$

MHT CET 2025 26th April Evening Shift

MCQ (Single Correct Answer)

-0

In the thermodynamic processes, which of the following statements is NOT true?

In an isothermal process, the temperature remains constant.

In an adiabatic process, the system is insulated from surroundings.

In an isochoric process, pressure remains constant.

In an adiabatic process, $\mathrm{PV}^\gamma=$ constant.

MHT CET 2025 26th April Morning Shift

MCQ (Single Correct Answer)

-0

In case of free expansion, which one of the following statements is WRONG?

It is an instantaneous change.

The system is not in thermodynamic equilibrium.

Free expansion can be plotted on a P-V diagram.

It is an uncontrolled change.

MHT CET 2025 26th April Morning Shift

MCQ (Single Correct Answer)

-0

An ideal gas expands adiabatically, $(\gamma=1.5)$. To reduce the r.m.s. velocity of the molecules 4 times, the gas has to be expanded

256 times

128 times

64 times

8 times

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