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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