Physics Viva Questions Class 11

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Physics Viva Questions Class 11. We covered all the Physics Viva Questions Class 11 in this post for free so that you can practice well for the exam.

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Physics Viva Questions Class 11 MCQs for Students

A Carnot engine has an efficiency of 20%. The energy is supplied to the engine at the rate of 2 kW. What is the output power of the engine?

(A) 300 W

(B) 400 W

(C) 500 W

(D) 600 W

Option b – 400 W

For a Carnot engine, the source and the sink temperatures are 527 °C and 47 °C respectively and the engine extracts 800 J of heat in each cycle. What is the area enclosed by the P-V diagram in terms of energy units?

(A) 280 J

(B) 350 J

(C) 480 J

(D) 600 J

Option c – 480 J

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of the source be increased so as to increase its efficiency by 50% of the original efficiency?

(A) 225 K

(B) 250 K

(C) 275 K

(D) 350 K

Option b – 250 K

Even the Carnot engine cannot give 100% efficiency because we cannot :

(A) reach absolute zero temperature

(B) find ideal sources

(C) eliminate friction

(D) prevent radiation

Option a – reach absolute zero temperature

An ideal Carnot engine, whose efficiency is 40%, receives heat from the source at 500 K. The efficiency is to increase to 50% by keeping the same temperature of the sink. What should be the temperature of the source?

(A) 600 K

(B) 800 K

(C) 700 K

(D) 900 K

Option a – 600 K

Which statement is incorrect?

(A) Carnot cycle has the maximum efficiency in all cycles

(B) Carnot cycle is a reversible one

(C) Reversible cycle has more efficiency than an irreversible one

(D) All reversible cycles have the same efficiency

Option d – All reversible cycles have the same efficiency

A Carnot engine takes in heat from a reservoir of heat at 427 °C and gives out heat to the sink at 77 °C. How many calories per second must it take from the reservoir in order to produce useful mechanical work at the rate of 357 W?

(A) 150 cal/s

(B) 160 cal/s

(C) 170 cal/s

(D) 180 cal/s

Option c – 170 cal/s

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an of efficiency 60%. Then, the intake engine temperature for the same exhaust (sink) temperature must be :

(A) 600 K

(B) 750 K

(C) 1200 K

(D) Efficiency of the Carnot engine cannot be made larger than 50%

Option b – 750 K

We covered all the physics class 11 viva questions above in this post for free so that you can practice well for the exam.

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