1
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. considering only translational and rotational modes, the total internal energy of the system is :
A
12 RT
B
20 RT
C
4 RT
D
15 RT
2
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
A rigid diatomic ideal gas undergoes an adiabatic process at room temperature. The relation between temperature and volume for this process is TVx = constant, then x is :
A
$${5 \over 3}$$
B
$${2 \over 5}$$
C
$${3 \over 5}$$
D
$${2 \over 3}$$
3
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
Ice at –20oC is added to 50 g of water at 40oC. When the temperature of the mixture reaches 0oC, it is found that 20 g of ice is still unmelted. The amount of ice added to the water was close to (Specific heat of water = 4.2J/g/oC Specific heat of Ice = 2.1J/g/oC Heat of fusion of water at 0oC= 334J/g)
A
100 g
B
60 g
C
50 g
D
40 g
4
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
Half mole of an ideal monoatomic gas is heated at constant pressure of 1 atm from 20oC to 90oC. Work done by gas is close to – (Gas constant R = 8.31 J/mol.K)
A
581 J
B
73 J
C
146 J
D
291 J
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