1
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
2
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
3
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
4
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity from the earth, is closest to :
[Boltzmann Constant kB = 1.38 × 10–23 J/K Avogadro Number NA = 6.02 × 1026 /kg Radius of Earth : 6.4 × 106 m Gravitational acceleration on Earth = 10ms–2]
A
3 × 105 K
B
104 K
C
650 K
D
800 K
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