MHT CET (PCB) 2024 22th April Morning Shift | Heat and Thermodynamics Question 2 | Physics

A spherical body of radius ' $r$ ' radiates power ' $P$ ' at $T$ kelvin. If the radius $s$ halved and the temperature doubled the power radiated in the same time ' t ' will be

$\frac{\mathrm{P}}{2}$

2 P

4 P

8 P

MHT CET (PCB) 2024 22th April Morning Shift

MCQ (Single Correct Answer)

-0

In thermodynamic process, which of the following statements is not true?

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

In an isochoric process, the pressure remains constant.

In an isothermal process, the temperature remains constant.

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

MHT CET (PCB) 2024 22th April Morning Shift

MCQ (Single Correct Answer)

-0

A monoatomic ideal gas, initially at temperature ' $\mathrm{T}_1$ '' is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature ' $\mathrm{T}_2$ ' by releasing the piston suddenly. $L_1$ and $L_2$ are the lengths of the gas columns before and after the expansion respectively. Then $\frac{T_1}{T_2}$ is

$\sqrt{\frac{\mathrm{L}_1}{\mathrm{~L}_2}}$

$\sqrt{\frac{\mathrm{L}_2}{\mathrm{~L}_1}}$

$\left(\frac{L_1}{L_2}\right)^{2 / 3}$

$\left(\frac{L_2}{L_1}\right)^{2 / 3}$

MHT CET (PCB) 2024 22th April Morning Shift

MCQ (Single Correct Answer)

-0

The volume of a block of metal at $30^{\circ} \mathrm{C}$ changes by $0.12 \%$ when its temperature is increased to $70^{\circ} \mathrm{C}$. The coefficient of linear expansion of the metal is

$2 \times 10^{-5}{ }^{\circ} \mathrm{C}$

$3 \times 10^{-5}{ }^{\circ} \mathrm{C}$

$4 \times 10^{-5}{ }^{\circ} \mathrm{C}$

$1 \times 10^{-5}{ }^{\circ} \mathrm{C}$

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