1
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
n moles of an ideal gas with constant volume heat capcity CV undergo an isobaric expansion by certain volume. The ratio of the work done in the process, to the heat supplied is :
A
$${{nR} \over {{C_V} - nR}}$$
B
$${{4nR} \over {{C_V} - nR}}$$
C
$${{4nR} \over {{C_V} + nR}}$$
D
$${{nR} \over {{C_V} + nR}}$$
2
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
A 25 × 10–3 m3 volume cylinder is filled with 1 mol of O2 gas at room temperature (300K). The molecular diameter of O2, and its root mean square speed, are found to be 0.3 nm, and 200 m/s, respectively. What is the average collision rate (per second) for an O2 molecule ?
A
~1013
B
~1012
C
~1011
D
~1010
3
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
A massless spring (k = 800 N/m), attached with a mass (500 g) is completely immersed in 1 kg of water. The spring is stretched by 2 cm and released so that it starts vibrating. What would be the order of magnitude of the change in the temperature of water when the vibrations stop completely ? (Assume that the water container and spring receive negligible heat and specific heat of mass = 400 J/kg K, specific heat of water = 4184 J/kg K)
A
10–3 K
B
10–1 K
C
10–5K
D
10–4 K
4
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
The specific heats, CP and CV of a gas of diatomic molecules, A, are given (in units of J mol–1 K–1) by 29 and 22, respectively. Another gas of diatomic molecules, B, has the corresponding values 30 and 21. If they are treated as ideal gases, then :-
A
A is rigid but B has a vibrational mode
B
A has a vibrational mode but B has none
C
A has one vibrational mode and B has two
D
Both A and B have a vibrational mode each
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