1
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
In thermodynamics, heat and work are :
A
Path functions
B
Point functions
C
Extensive thermodynamics state variables
D
Intensive thermodynamic state variables
2
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
The volume V of an enclosure contains a mixture of three gases, 16 g of oxygen, 28 g of nitrogen and 44 g of carbon dioxide at absolute temperature T. Consider R as universal gas constant. The pressure of the mixture of gases is :
A
$${{3RT} \over V}$$
B
$${{4RT} \over V}$$
C
$${{88RT} \over V}$$
D
$${5 \over 2}{{RT} \over V}$$
3
JEE Main 2021 (Online) 26th February Evening Shift
+4
-1
The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U $$=$$ 3PV + 4. The gas is :
A
either monoatomic or diatomic.
B
monoatomic only.
C
polyatomic only.
D
diatomic only.
4
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
The temperature $$\theta$$ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top and bottom temperatures $$\theta$$1 and $$\theta$$2 (as shown in figure) is given by :

A
$${{{\theta _1}{R_2} + {\theta _2}{R_1}} \over {{R_1} + {R_2}}}$$
B
$${{{\theta _1}{R_1} + {\theta _2}{R_2}} \over {{R_1} + {R_2}}}$$
C
$${{{\theta _1}{R_2} - {\theta _2}{R_1}} \over {{R_2} - {R_1}}}$$
D
$${{{\theta _2}{R_2} - {\theta _1}{R_1}} \over {{R_2} - {R_1}}}$$
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