Bharti Bhawan Physics Class 10. We covered all the Bharti Bhawan Physics Class 10 in this post for free so that you can practice well for the exam.
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Bharti Bhawan Physics Class 10 MCQs for Students
If a Carnot engine is working between the steam point and the ice point, then its efficiency will be
(A) 24.9%
(B) 25.7%
(C) 26.8%
(D) 28.8%
Option c – 26.8%
A Carnot engine absorbs 750 J of heat energy from a reservoir at 137 °C and rejects 500 J of heat during each cycle, then the temperature of the sink is
(A) 0.25 °C
(B) 0.34 °C
(C) 0.44 °C
(D) 0.54 °C
Option b – 0.34 °C
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 engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be
(A) 1200 K
(B) 750 K
(C) 600 K
(D) 800 K
Option b – 750 K
A refrigerator is to maintain eatables kept inside at 7 °C. The coefficient of performance of a refrigerator if the room temperature is 38 °C is
(A) 15.5
(B) 16.3
(C) 20.1
(D) 9.03
Option d – 9.03
If the coefficient of performance of a refrigerator is 5 and operates at the room temperature of 27 °C, the temperature inside the refrigerator is
(A) 240 K
(B) 250 K
(C) 230 K
(D) 260 K
Option b – 250 K
A Carnot’s cycle operating between T₁=600 K and T₂ = 300 K produces 1.5 kJ of mechanical work per cycle. The heat transferred to the engine by the reservoirs is
(A) 2.5 kJ
(B) 3 kJ
(C) 3.5 kJ
(D) 4 kJ
Option b – 3 kJ
Consider a Carnot cycle operating between source 750 K and sink temperature 350 K producing 1.25 kJ of mechanical work per cycle, the heat transferred to the engine by the reservoirs
(A) 1.5 kJ
(B) 2.34 kJ
(C) 3.34 kJ
(D) 4.34 kJ
Option b – 2.34 kJ
Two moles of an ideal monoatomic gas occupy a volume of 2V at a temperature of 300 K, it expands to a volume of 4V adiabatically, then the final temperature of the gas is
(A) 179 K
(B) 189 K
(C) 199 K
(D) 219 K
Option b – 189 K
An engine has an efficiency of 0.25 when the temperature of the sink is reduced by 58 °C, if its efficiency is doubled, then the temperature of the source is
(A) 150 °C
(B) 222 °C
(C) 242 °C
(D) 232 °C
Option d – 232 °C
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