Which is incorrect ?

(1) In an isobaric process, Δp = 0

(2) In an isochoric process, ΔW = 0

(3) In an isothermal process, ΔT = 0

(4) In an isothermal process, ΔQ = 0

Subtopic:  Types of Processes |
 86%
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A Carnot engine working between 300 K and 600K has work output of 800 J per cycle. What is amount of heat energy supplied to the engine from source per cycle ?

(1) 1800 J/cycle

(2) 1000 J/cycle

(3) 2000 J/cycle

(4) 1600 J/cycle

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 82%
From NCERT
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In a cyclic process, the internal energy of the gas:

1. Increases 2. Decreases
3. Remains constant 4. Becomes zero
Subtopic:  Cyclic Process |
 54%
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For a reversible process, necessary condition is -

(1) In the whole cycle of the system, the loss of any type of heat energy should be zero

(2) That the process should be too fast

(3) That the process should be slow so that the working substance should remain in thermal and mechanical equilibrium with the surroundings

(4) The loss of energy should be zero and it should be quasistatic

Subtopic:  Types of Processes |
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A Carnot's engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are 411°C and 69°C respectively and the engine extracts 1000 J of heat in each cycle, then area enclosed by the PV diagram is -

(1) 100 J

(2) 300 J

(3) 500 J

(4) 700 J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 79%
From NCERT
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The temperature of sink of Carnot engine is 27°C. Efficiency of engine is 25%. Then temperature of source is -

(1) 227°C

(2) 327°C

(3) 127°C

(4) 27°C

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 82%
From NCERT
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The temperature of reservoir of Carnot's engine operating with an efficiency of 70% is 1000K. The temperature of its sink is -

(1) 300 K

(2) 400 K

(3) 500 K

(4) 700 K

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 86%
From NCERT
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In a Carnot engine, when \(T_2=0^\circ \mathrm{C}\) and \(T_1=200^\circ \mathrm{C},\) its efficiency is \(\eta_1\) and when \(T_1=0^\circ \mathrm{C}\) and \(T_2=-200^\circ \mathrm{C},\) its efficiency is \(\eta_2.\) What is the value of \(\frac{\eta_1}{\eta_2}?\)

1. 0.577 2. 0.733
3. 0.638 4. cannot be calculated
Subtopic:  Carnot Engine |
 73%
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The efficiency of Carnot's engine operating between reservoirs, maintained at temperatures 27°C and –123°C, is 

(1) 50%

(2) 24%

(3) 0.75%

(4) 0.4%

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 79%
From NCERT
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A Carnot engine operates between 227°C and 27°C . Efficiency of the engine will be -

(1) 13

(2) 25

(3) 34

(4) 35

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 88%
From NCERT
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