1
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A sphere of surface area $$4 \mathrm{~m}^2$$ at temperature 400 K and having emissivity 0.5 is located in an environment of temperature 200 K. The net rate of energy exchange of the sphere is (Stefan Boltzmann constant, $$\sigma=5.67 \times 10^{-8} \mathrm{Wm}^{-2} \mathrm{~K}^4)$$

A
3260.8 W
B
1632.4 W
C
2721.6 W
D
4216.4 W
2
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A Carnot engine operates between a source and a sink. The efficiency of the engine is $$40 \%$$ and the temperature of the sink is $$27^{\circ} \mathrm{C}$$. If the efficiency is to be increased to $$50 \%$$, then the temperature of the source must be increased by

A
80 K
B
120 K
C
100 K
D
160 K
3
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A car engine has a power of 20 kW. The car makes a roundtrip of 1 h. If the thermal efficiency of the engine is $$40 \%$$ and the ambient temperature is 300 K . The energy generated by fuel combustion is

A
180000 kJ
B
240000 kJ
C
360000 kJ
D
270000 kJ
4
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

The number of vibrational degree of freedom of a diatomic molecule is

A
0
B
1
C
2
D
3
EXAM MAP
Medical
NEET