MCQ Heat Engines, Class 11 Physics

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. In a heat engine the ratio of net work done per cycle by the engine to the total amount of heat absorbed per cycle by the working substance from the source is known as

Adiabatic compression ratio

Specifie heat ratio

Conductivity

Thermal Efficiency

Question 1 of 10

2. In actual home refrigerator vapours of Freon ( which is dichlorodifluoro methane CCl₂F₂) act as

Sink

Working substance

Source

Insulating pad

Question 2 of 10

3. A carnot engine is taking 700 cal from source and is rejecting 500 cal to the sink in each cycle. What is the temperature of sink if the source temperature is 150° C .

29.02° C

27.75° C

30.05° C

31.5° C

Question 3 of 10

4. According to Carnot theorem no heat engine working between two given temperatures of source and sink can be more efficient than a perfectly ___________ engine working between the same two temperatures

Reversible

Heat

Combustible

Ideal gas

Question 4 of 10

5. How much heat energy a petrol engine would require to do 20 kWh of work? Its adiabatic compression ratio is 9 and γ= 1.5.

10.7 J

1.07 X10⁷J

30 J

180 J

Question 5 of 10

6. An ideal gas is taken through a cycle of operations shown by the indicator diagram. The net work done by the gas at the end of the cycle is:

4P₀V₀

15P₀V₀

6P₀V₀

3P₀V₀

Question 6 of 10

7. What would be the horse power of a steam engine with average pressure of steam 9x 10⁴ Nm^-2 , the area of cross section of the piston is 0.2 m², length of stroke is 0.6 m and piston makes 5 revolutions per second?

150 h.p

140.7 h.p

104.7 h.p

144.77 h.p

Question 7 of 10

8. The ratio of quantity of heat removed per cycle from the contents of the refrigerator to the energy spent per cycle to remove this heat is called the

coefficient of performance

principle of heat engine

efficiency of heat engine

efficiency of refrigerator

Question 8 of 10

9. In a Carnot engine 800 J of heat is absorbed from a source at 400 K and 640 J of heat is rejected to the sink. The temperature of the sink is:

273 K

100 K

320 K

250 K

Question 9 of 10

10. The temperature inside a refrigerator is 4°C and the room temperature is 27°C. How many joules of heat will be delivered to the room for each joule of electricity consumed by the refrigerator?( Treat the refrigerator as ideal).

1 J

12 J

8.3 J

13 J

Question 10 of 10

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