1
MHT CET 2021 23th September Morning Shift
+1
-0

The temperature of a black body is increased by $$50 \%$$, then the percentage increase in the rate of radiation by the body is approximated

A
50%
B
100%
C
400%
D
150%
2
MHT CET 2021 22th September Evening Shift
+1
-0

The emissive power of sphere of area $$0.04 \mathrm{~m}^2$$ is $$0.7 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$. The amount of heat radiated in 20 second is

A
$$2.8 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$
B
$$0.28 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$
C
$$5.6 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$
D
$$0.56 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$
3
MHT CET 2021 22th September Evening Shift
+1
-0

The rate of flow of heat through a copper rod with temperature difference $$28^{\circ} \mathrm{C}$$ is $$1400 \mathrm{~cal} \mathrm{~s}^{-1}$$. The thermal resistance of copper rod will be

A
$$0.05 \frac{{ }^{\circ} \mathrm{C} \mathrm{s}}{\mathrm{cal}}$$
B
$$0.02 \frac{{ }^{\circ} \mathrm{C} \mathrm{s}}{\mathrm{cal}}$$
C
$$5 \frac{{ }^{\circ} \mathrm{C} \mathrm{s}}{\mathrm{cal}}$$
D
$$2 \frac{{ }^{\circ} \mathrm{Cs}}{\text { cal }}$$
4
MHT CET 2021 22th September Evening Shift
+1
-0

The change in internal energy of the mass of a gas, when the volume changes from '$$\mathrm{V}$$' to '$$2 \mathrm{~V}$$' at constant pressure 'P' is ($$\gamma=$$ Ratio of Cp to Cv)

A
$$\frac{\mathrm{PV}}{(\gamma-1)}$$
B
$$\frac{\mathrm{P}}{(\gamma-1)}$$
C
PV
D
$$\frac{\gamma \mathrm{PV}}{(\gamma-1)}$$
EXAM MAP
Medical
NEET