1
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
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 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
4
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The ratio of specific heats $$\left( {{{{C_P}} \over {{C_V}}}} \right)$$ in terms of degree of freedom (f) is given by :

A
$$\left( {1 + {f \over 3}} \right)$$
B
$$\left( {1 + {2 \over f}} \right)$$
C
$$\left( {1 + {f \over 2}} \right)$$
D
$$\left( {1 + {1 \over f}} \right)$$
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