1
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The relation obeyed by a perfect gas during an adiabatic process is $$\mathrm{PV}^{3 / 2}$$. The initial temperature of the gas is '$$\mathrm{T}$$'. When the gas is compressed to half of its Initial volume, the final temperature of the gas is

A
$$2 \sqrt{2} \mathrm{~T}$$
B
$$4 \mathrm{~T}$$
C
$$\sqrt{2} \mathrm{~T}$$
D
$$2 \mathrm{~T}$$
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A black rectangular surface of area '$$\mathrm{A}$$' emits energy '$$\mathrm{E}$$' per second at $$27^{\circ} \mathrm{C}$$. If length and breadth is reduced to $$(1 / 3)^{\text {rd }}$$ of its initial value and temperature is raised to $$327^{\circ} \mathrm{C}$$ then energy emitted per second becomes

A
$$\frac{20 \mathrm{E}}{9}$$
B
$$\frac{8 \mathrm{E}}{9}$$
C
$$\frac{16 \mathrm{E}}{9}$$
D
$$\frac{4 \mathrm{E}}{9}$$
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A monoatomic gas is suddenly compressed to (1/8)th of its initial volume adiabatically. The ratio of the final pressure to initial pressure of the gas is ($$\gamma=5/3$$)

A
32
B
8
C
$$\frac{40}{3}$$
D
$$\frac{24}{5}$$
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A conducting rod of length $$1 \mathrm{~m}$$ has area of cross-section $$10^{-3} \mathrm{~m}^2$$. One end is immersed in baiting water $$\left(100^{\circ} \mathrm{C}\right)$$ and the other end in Ice $$\left(0^{\circ} \mathrm{C}\right)$$. If coefficient of thermal conductivity of $$\mathrm{rod}$$ is $$96 \mathrm{~cal} / \mathrm{sm}^{\circ} \mathrm{C}$$ and latent heat for ice is $$8 \times 10^{-4} \mathrm{cal} / \mathrm{kg}$$ then the amount of ice which will melt in one minute is

A
$$5.4 \times 10^{-3} \mathrm{~kg}$$
B
$$7.2 \times 10^{-3} \mathrm{~kg}$$
C
$$1.8 \times 10^{-3} \mathrm{~kg}$$
D
$$3.6 \times 0^{-3} \mathrm{~kg}$$
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