Important Questions for Class 12 Physics with Answers State Board. We covered all the Important Questions for Class 12 Physics with Answers State Board in this post for free so that you can practice well for the exam.
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Class 12 Physics MCQs for Students
The temperatures of the source and the sink of a heat engine are 127 °C and 27 °C respectively. An inventor claims its efficiency to be 30%, then :
(A) it is impossible
(B) it is possible with a high probability
(C) it is possible with a low probability
(D) data is insufficient
Option a – it is impossible
A heat engine absorbs 1000 J of heat from a hot reservoir at 127 °C and rejects 600 J of heat during each cycle. The efficiency of the engine is :
(A) 10 %
(B) 20 %
(C) 30 %
(D) 40 %
Option d – 40 %
An ideal heat engine exhausting heat at 27 °C is to have 25 % efficiency. It must take the heat at :
(A) 127 °C
(B) 227 °C
(C) 327 °C
(D) 673 °C
Option a – 127 °C
An automobile engine absorbs 1600 J from a source and expels 1000 J to a sink in each cycle. The maximum work done in each cycle is :
(A) 300 J
(B) 600 J
(C) 1300 J
(D) 2600 J
Option b – 600 J
An engine takes compressed steam at 127 °C and rejects it at 47 °C. The efficiency of the engine is :
(A) 20%
(B) 35 %
(C) 40 %
(D) 60 %
Option a – 20%
A scientist says that if the efficiency of his heat engine which operates at a source temperature of 127 °C and sink temperature of 27 °C is 26%, then :
(A) It is impossible
(B) It is possible but less probable
(C) It is quite probable
(D) Data is incomplete
Option a – It is impossible
A heat engine has an efficiency of 1/3. The amount of work this heat engine can perform per kcal of heat input is :
(A) 700 cal
(B) 1400 cal
(C) 700 J
(D) 1400 J
Option d – 1400 J
What is the value of sink temperature when the efficiency of the heat engine is 100 %?
(A) 0 K
(B) 273 K
(C) 300 K
(D) 400 K
Option a – 0 K
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