1
JEE Main 2021 (Online) 27th August Evening Shift
+4
-1
if the rms speed of oxygen molecules at 0$$^\circ$$C is 160 m/s, find the rms speed of hydrogen molecules at 0$$^\circ$$C.
A
640 m/s
B
40 m/s
C
80 m/s
D
332 m/s
2
JEE Main 2021 (Online) 27th August Evening Shift
+4
-1
The height of victoria falls is 63 m. What is the difference in temperature of water at the top and at the bottom of fall?

[Given 1 cal = 4.2 J and specific heat of water = 1 cal g$$-$$1 $$^\circ$$0C$$-$$1]
A
0.147$$^\circ$$ C
B
14.76$$^\circ$$ C
C
1.476$$^\circ$$ C
D
0.014$$^\circ$$ C
3
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
A balloon carries a total load of 185 kg at normal pressure and temperature of 27$$^\circ$$C. What load will the balloon carry on rising to a height at which the barometric pressure is 45 cm of Hg and the temperature is $$-$$7$$^\circ$$C. Assuming the volume constant?
A
181.46 kg
B
214.15 kg
C
219.07 kg
D
123.54 kg
4
JEE Main 2021 (Online) 27th August Morning Shift
+4
-1
An ideal gas is expanding such that PT3 = constant. The coefficient of volume expansion of the gas is :
A
$${1 \over T}$$
B
$${2 \over T}$$
C
$${4 \over T}$$
D
$${3 \over T}$$
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