1
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1

A thermodynamic system is taken from an original state D to an intermediate state E by the linear process shown in the figure. Its volume is then reduced to the original volume from E to F by an isobaric process. The total work done by the gas from D to E to F will be

A
$$-$$450 J
B
450 J
C
900 J
D
1350 J
2
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1

The root mean square speed of smoke particles of mass $$5 \times 10^{-17} \mathrm{~kg}$$ in their Brownian motion in air at NTP is approximately. [Given $$\mathrm{k}=1.38 \times 10^{-23} \mathrm{JK}^{-1}$$]

A
$$60 \mathrm{~mm} \mathrm{~s}^{-1}$$
B
$$12 \mathrm{~mm} \mathrm{~s}^{-1}$$
C
$$15 \mathrm{~mm} \mathrm{~s}^{-1}$$
D
$$36 \mathrm{~mm} \mathrm{~s}^{-1}$$
3
JEE Main 2022 (Online) 28th July Evening Shift
+4
-1

A vessel contains $$14 \mathrm{~g}$$ of nitrogen gas at a temperature of $$27^{\circ} \mathrm{C}$$. The amount of heat to be transferred to the gas to double the r.m.s speed of its molecules will be :

Take $$\mathrm{R}=8.32 \mathrm{~J} \mathrm{~mol}^{-1} \,\mathrm{k}^{-1}$$.

A
2229 J
B
5616 J
C
9360 J
D
13,104 J
4
JEE Main 2022 (Online) 28th July Evening Shift
+4
-1

Sun light falls normally on a surface of area $$36 \mathrm{~cm}^{2}$$ and exerts an average force of $$7.2 \times 10^{-9} \mathrm{~N}$$ within a time period of 20 minutes. Considering a case of complete absorption, the energy flux of incident light is

A
$$25.92 \times 10^{2} \mathrm{~W} / \mathrm{cm}^{2}$$
B
$$8.64 \times 10^{-6} \mathrm{~W} / \mathrm{cm}^{2}$$
C
$$6.0 \mathrm{~W} / \mathrm{cm}^{2}$$
D
$$0.06\mathrm{~W} / \mathrm{cm}^{2}$$
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