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JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)  +4  -1
Calculate the value of mean free path ($$\lambda$$) for oxygen molecules at temperature 27$$^\circ$$C and pressure 1.01 $$\times$$ 105 Pa. Assume the molecular diameter 0.3 nm and the gas is ideal. (k = 1.38 $$\times$$ 10$$-$$23 JK$$-$$1)
A
32 nm
B
58 nm
C
86 nm
D
102 nm
2
JEE Main 2021 (Online) 16th March Evening Shift
MCQ (Single Correct Answer)  +4  -1
A bimetallic strip consists of metals A and B. It is mounted rigidly as shown. The metal A has higher coefficient of expansion compared to that of metal B. When the bimetallic strip is placed in a cold bath, it will :

A
Neither bend nor shrink
B
Bend towards the left
C
Not bend but shrink
D
Bend towards the right
3
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)  +4  -1
In thermodynamics, heat and work are :
A
Path functions
B
Point functions
C
Extensive thermodynamics state variables
D
Intensive thermodynamic state variables
4
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)  +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
$${5 \over 2}{{RT} \over V}$$
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