CBSE Class 11 Thermodynamics Worksheet B

Read and download free pdf of CBSE Class 11 Thermodynamics Worksheet B. Download printable Physics Class 11 Worksheets in pdf format, CBSE Class 11 Physics Chapter 12 Thermodynamics Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Physics Class 11 Assignments and practice them daily to get better marks in tests and exams for Class 11. Free chapter wise worksheets with answers have been designed by Class 11 teachers as per latest examination pattern

Chapter 12 Thermodynamics Physics Worksheet for Class 11

Class 11 Physics students should refer to the following printable worksheet in Pdf in Class 11. This test paper with questions and solutions for Class 11 Physics will be very useful for tests and exams and help you to score better marks

Class 11 Physics Chapter 12 Thermodynamics Worksheet Pdf

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Question. By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 10% at a constant temperature?
(a) 8.1 %
(b) 9.1 %
(c) 10.1 %
(d) 11.1 %

Answer: D

Question. A refrigerator works between 0ºC and 27ºC. Heat is to be removed from the refrigerated space at the rate of 50 kcal/ minute, the power of the motor of the refrigerator is
(a) 0.346 kW
(b) 3.46 kW
(c) 34.6 kW
(d) 346 kW

Answer: A

Question. Two cylinders fitted with pistons contain equal amount of an ideal diatomic gas at 300 K. The piston of A is free to move, while that of B is held fixed. The same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30 K, then the rise in temperature of gas in B is
(a) 30 K
(b) 18 K
(c) 50 K
(d) 42 K

Answer: D

Question. A Carnot engine works first between 200°C and 0°C and then between 0°C and –200°C. The ratio of its efficiency in the two cases is
(a) 1.0
(b) 0.577
(c) 0.34
(d) 0.68

Answer: B

Question. A perfect gas goes from a state A to another state B by absorbing 8 × 105 J of heat and doing 6.5 × 105 J of external work. It is now transferred between the same two states in another process in which it absorbs 105 J of heat. In the second process
(a) work done by gas is 105 J
(b) work done on gas is 105 J
(c) work done by gas is 0.5 × 105 J
(d) work done on the gas is 0.5 × 105 J

Answer: D

Question. A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is
(a) 2 PV
(b) 4 PV
(c) 1/2
(d) P V

Answer: A

Question. Which of the following is incorrect regarding first law of thermodynamics?
(a) It is a restatement of principle of conservation of energy.
(b) It is applicable to cyclic processes
(c) It introduces the concept of entropy
(d) It introduces the concept of internal energy

Answer: C

Question. A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is: (Take 1 cal = 4.2 joules)
(a) 2.365 W
(b) 23.65 W
(c) 236.5 W
(d) 2365 W

Answer: C

Question. A Carnot’s engine works as a refrigerator between 250 K and 300 K. If it receives 750 calories of heat from the reservoir at the lower temperature, the amount of heat rejected at the higher temperature is
(a) 900 calories
(b) 625 calories
(c) 750 calories
(d) 1000 calories

Answer: A

Question. A Carnot engine is working between 127°C and 27°C. The increase in efficiency will be maximum when the temperature of
(a) the source is increased by 50°C
(b) the sink is decreased by 50°C
(c) source is increased by 25°C and that of sink is decreased by 25°C
(d) both source and sink are decreased by 25°C each.

Answer: B

Question. During an adiabatic process an object does 100J of work and its temperature decreases by 5K. During another process it does 25J of work and its temperature decreases by 5K. Its heat capacity for 2nd process is
(a) 20 J/K
(b) 24 J/K
(c) 15 J/K
(d) 100 J/K

Answer: C

Question. The temperature at which speed of sound in air becomes double of its value at 27° C is
(a) 54°C
(b) 327°C
(c) 927°C
(d) None of these

Answer: C

Question. Air conditioner is based on the principle of
(a) Carnot cycle
(b) refrigerator
(c) first low of thermodynamics
(d) None of these

Answer: B

Question. An ideal refrigerator has a freezer at a temperature of 13ºC. The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) is
(a) 320ºC
(b) 39ºC
(c) 325 K
(d) 325ºC

Answer: B

Question. One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from 0ºC to 100ºC. Then the work done by the gas is
(a) 6.56 joule
(b) 8.32 × 102 joule
(c) 12.48 × 102 joule
(d) 20.8 × 102 joule

Answer: B

Question. During isothermal expansion, the slope of P-V graph
(a) decreases
(b) increases
(c) remains same
(d) may increase or decrease

Answer: A

Question. A carnot’s engine takes 300 calories of heat at 500 K and rejects 150 calories of heat to the sink. The temperature of the sink is
(a) 1000 K
(b) 750 K
(c) 250 K
(d) 125 K

Answer: C

Question. The source and sink temperatures of a Carnot engine are 400 K and 300 K, respectively. What is its efficiency?
(a) 100%
(b) 75%
(c) 33.3%
(d) 25%

Answer: D

Question. A closed gas cylinder is divided into two parts by a piston held tight. The pressure and volume of gas in two parts respectively are (P, 5V) and (10P, V). If now the piston is left free and the system undergoes isothermal process, then the volumes of the gas in two parts respectively are
(a) 2V, 4V
(b) 3V, 3V
(c) 5V, V
(d) 10/11V , 20/11V

Answer: A


1. Draw a p – v diagram for isothermal and adiabatic expansion?

2. State zeroth law of thermodynamics?

3. Can a gas be liquefied at any temperature by increase of pressure alone?

4. A certain gas at atmospheric pressure is compressed adiabatically so that its volume becomes half of its original volume. Calculate the resulting pressure?

5. Why is conversion of heat into work not possible without a sink at lower temperature?

6. Write the sign conventions for the heat and work done during a thermodynamic process?

7. Deduce the work done in the following complete cycle?

CBSE Class 11 Thermodynamics Worksheet B

8. One kilogram molecule of a gas at 400k expands isothermally until its volume is doubled. Find the amount of work done and heat produced? 

9. Derive the equation of state for adiabatic change?

Click on link below to download CBSE Class 11 Thermodynamics Worksheet B.

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