1
JEE Main 2022 (Online) 26th June Evening Shift
+4
-1 A flask contains argon and oxygen in the ratio of 3 : 2 in mass and the mixture is kept at 27$$^\circ$$C. The ratio of their average kinetic energy per molecule respectively will be :

A
3 : 2
B
9 : 4
C
2 : 3
D
1 : 1
2
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1 The efficiency of a Carnot's engine, working between steam point and ice point, will be :

A
26.81%
B
37.81%
C
47.81%
D
57.81%
3
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1 A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heats 1.4. Vessel is moving with speed v and is suddenly brought to rest. Assuming no heat is lost to the surrounding and vessel temperature of the gas increases by :

(R = universal gas constant)

A
$${{M{v^2}} \over {7R}}$$
B
$${{M{v^2}} \over {5R}}$$
C
2$${{M{v^2}} \over {7R}}$$
D
7$${{M{v^2}} \over {5R}}$$
4
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1 A copper block of mass 5.0 kg is heated to a temperature of 500$$^\circ$$C and is placed on a large ice block. What is the maximum amount of ice that can melt? [Specific heat of copper : 0.39 J g$$-$$1 $$^\circ$$C$$-$$1 and latent heat of fusion of water : 335 J g$$-$$1]

A
1.5 kg
B
5.8 kg
C
2.9 kg
D
3.8 kg
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