1
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
An HCl molecule has rotational, translational and vibrational motions. If the rms velocity of HCl molecules in its gaseous phase is $$\overline v$$ , m is its mass and kB is Boltzmann constant, then its temperature will be :
A
$${{m{{\overline v }^2}} \over {5{k_B}}}$$
B
$${{m{{\overline v }^2}} \over {6{k_B}}}$$
C
$${{m{{\overline v }^2}} \over {7{k_B}}}$$
D
$${{m{{\overline v }^2}} \over {3{k_B}}}$$
2
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
Following figure shows two processes A and B for a gas. If $$\Delta$$QA and $$\Delta$$QB are the amount of heat absorbed by the system in two cases, and $$\Delta$$UA and $$\Delta$$UB are changes in internal energies, respectively, then :
A
$$\Delta$$QA > $$\Delta$$QB ; $$\Delta$$UA > $$\Delta$$UB
B
$$\Delta$$QA < $$\Delta$$QB ; $$\Delta$$UA < $$\Delta$$UB
C
$$\Delta$$QA > $$\Delta$$QB ; $$\Delta$$UA = $$\Delta$$UB
D
$$\Delta$$QA = $$\Delta$$QB ; $$\Delta$$UA = $$\Delta$$UB
3
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
For a given gas at 1 atm pressure, rms speed of the molecule is 200 m/s at 127°C. At 2 atm pressure and at 227°C, the rms speed of the molecules will be :
A
100 m/s
B
100 $$\sqrt 5$$ m/s
C
80 $$\sqrt 5$$ m/s
D
80 m/s
4
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by :-
A
d a b c
B
a d b c
C
d a c b
D
a d c b
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Physics
Mechanics
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Modern Physics
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Physical Chemistry
Inorganic Chemistry
Organic Chemistry
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