Physics Question Bank Solution Class 12. We covered all the Physics Question Bank Solution Class 12 in this post for free so that you can practice well for the exam.
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Class 12 Physics Quiz Questions for Students
A Carnot engine working between 450 K and 600 K has a work output of 300 J/cycle. What is the amount of heat energy supplied to the engine from the source in each cycle?
(A) 400 J
(B) 800 J
(C) 1200 J
(D) 1600 J
Option c – 1200 J
The temperature of the sink of a Carnot engine is 27 °C, and The efficiency of the engine is 25%. What is the temperature of the source?
(A) 127 °C
(B) 227 °C
(C) 327 °C
(D) 427 °C
Option a – 127 °C
For which of the following combinations of working temperatures, the efficiency of the Carnot engine is maximum?
(A) 40 K and 20 K
(B) 50 K and 30 K
(C) 70 K and 50 K
(D) 90 K and 60 K
Option a – 40 K and 20 K
A Carnot engine has the same efficiency between 800 K and 500 K and x K to 400 K. What is the value of x?
(A) 550 K
(B) 640 K
(C) 750 K
(D) 900 K
Option b – 640 K
A Carnot engine has the same efficiency between 100 K and 500 K and T and 900 K. What is the value of the temperature T?
(A) 130 K
(B) 160 K
(C) 180 K
(D) 200 K
Option c – 180 K
A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle, the volume of the gas increases from V to 32V, the efficiency of the engine is :
(A) 0.25
(B) 0.50
(C) 0.75
(D) 0.99
Option c – 0.75
The source temperature of a Carnot engine is 127 °C. It takes 500 cal of heat from the source and rejects 400 cal to the sink during each cycle. What is the temperature of the sink?
(A) 37 °C
(B) 47 °C
(C) 20 °C
(D) 27 °C
Option b – 47 °C
What is the least amount of work that must be done to freeze 10 grams of water at 0 °C by means of a refrigeration machine? The temperature of the surrounding is 27 °C :
(A) 50 cal
(B) 63 cal
(C) 70 cal
(D) 79 cal
Option d – 79 cal
The coefficient of performance of a refrigerator is 5. If the temperature inside the freezer is -20 °C, the temperature of the surroundings to which it rejects heat is :
(A) 11 °C
(B) 21 °C
(C) 31 °C
(D) 41 °C
Option c – 31 °C
A refrigerator abstracts 1600 cal of heat from the ice trays. The coefficient of performance is 4. What is the work done by the motor of the refrigerator in heat units i.e. calories?
(A) 200 cal
(B) 300 cal
(C) 400 cal
(D) 500 cal
Option c – 400 cal
An ideal refrigerator has a freezer at a temperature of -13 °C. The coefficient of performance of the refrigerator is 5. What is the temperature of the air, to which heat is rejected?
(A) 39 K
(B) 39 °C
(C) 320 K
(D) 320 °C
Option b – 39 °C
The inside and outside temperatures of a refrigerator are 273 K and 303 K respectively. Assume that the refrigeration cycle is reversible, then for every joule of work done, the heat delivered to the surrounding will be approximately equal to :
(A) 10 J
(B) 20 J
(C) 30 J
(D) 50 J
Option a – 10 J
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