1
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

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%
2
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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$${{M{v^2}} \over {5R}}$$
3
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A solid metallic cube having total surface area 24 m2 is uniformly heated. If its temperature is increased by 10$$^\circ$$C, calculate the increase in volume of the cube. (Given $$\alpha$$ = 5.0 $$\times$$ 10$$-$$4 $$^\circ$$C$$-$$1).

A
2.4 $$\times$$ 106 cm3
B
1.2 $$\times$$ 105 cm3
C
6.0 $$\times$$ 104 cm3
D
4.8 $$\times$$ 105 cm3
4
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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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