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Chapter 12 Thermodynamics Physics Worksheet for Class 11
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Class 11 Physics Chapter 12 Thermodynamics Worksheet Pdf
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Question. Figure shows the variation of internal energy (U) with the pressure (P) of 2.0 mole gas in cyclic process abcda. The temperature of gas at c and d are 300 K and 500 K. Calculate the heat absorbed by the gas during the process.
(a) 400 R ln 2
(b) 200 R ln 2
(c) 100 R ln 2
(d) 300 R ln 2
Answer: A
Question. If ΔU and ΔW represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?
(a) ΔU = -ΔW, in an adiabatic process
(b) ΔU =ΔW, in an isothermal process
(c) ΔU =ΔW, in an adiabatic process
(d) ΔU =-ΔW, in an isothermal process
Answer: A
Question. The volume of a gas is reduced adiabatically to 1/4 of its volume at 27ºC. If γ = 1.4 the new temperature is
(a) (300) 20.4 K
(b) (300) 21.4 K
(c) 300 (4)0.4 K
(d) 300 (2)1.4 K
Answer: C
Question. A mass of diatomic gas (ϒ = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rises from 27°C to 927°C. The pressure of the gas in final state is
(a) 28 atm
(b) 68.7 atm
(c) 256 atm
(d) 8 atm
Answer: C
Question. An ideal gas undergoes cyclic process ABCDA as shown in given p-V diagram. The amount of work done by the gas is
(a) 6p0V0
(b) –2p0V0
(c) +2p0V0
(d) +4p0V0
Answer: B
Question. The coefficient of performance of a refrigerator is 5. If the inside temperature of freezer is –20°C, then the temperature of the surroundings to which it rejects heat is
(a) 41°C
(b) 11°C
(c) 21°C
(d) 31°C
Answer: D
Question. In an adiabatic process, the pressure is increased by 2/3%. If ϒ= 3/2 , then the volume decreases by nearly
(a) 4/9%
(b) 2/3%
(c) 1%
(d) 9/4%
Answer: A
Question. An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?
(a) Isobaric
(b) Isochoric
(c) Isothermal
(d) Adiabatic
Answer: D
Question. In a Carnot engine efficiency is 40% at hot reservoir temperature T. For efficiency 50%, what will be the temperature of hot reservoir?
(a) T
(b) 2/3 T
(c) 4/5 T
(d) 6/5 T
Answer: D
Question. A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then :
(a) Compressing the gas isothermally will require more work to be done.
(b) Compressing the gas through adiabatic process will require more work to be done.
(c) Compressing the gas isothermally or adiabatically will require the same amount of work.
(d) Which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas.
Answer: B
Directions for Each question contains STATEMENT-1 and STATEMENT-2. Choose the correct answer (ONLY ONE option is correct ) from the following.
(a) Statement-1 is false, Statement-2 is true
b) Statement-1 is true, Statement-2 is true; Statement -2 is a correct explanation for Statement-1
(c) Statement-1 is true, Statement-2 is true; Statement -2 is not a correct explanation for Statement-1
(d) Statement-1 is true, Statement-2 is false
Question. Statement-1 : At a given temperature the specific heat of a gas at constant volume is always greater than its specific heat at constant pressure.
Statement-2 : When a gas is heated at constant volume some extra heat is needed compared to that at constant pressure for doing work in expansion.
Answer: A
Question. Statement -1 : If an ideal gas expands in vacuum in an insulated chamber, ΔQ, ΔU and ΔW all are zero.
Statement-2 : Temperature of the gas remains constant.
Answer: C
Question. An ideal gas undergoes four different processes from the same initial state (figure). Four processes are adiabatic, isothermal, isobaric and isochoric. Out of 1, 2, 3 and 4 which one is adiabatic?
(a) 4
(b) 3
(c) 2
(d) 1
Answer: C
Question. The internal energy of an ideal gas does not depend upon
(a) temperature of the gas
(b) pressure of the gas
(c) atomicity of the gas
(d) number of moles of the gas.
Answer: B
Question. At 27ºC a gas is compressed suddenly such that its pressure becomes (1/8) of original pressure. Final temperature will be (γ = 5/3)
(a) 450 K
(b) 300 K
(c) –142ºC
(d) 327ºC
Answer: C
Question. One mole of an ideal gas at an initial temperature of T K does 6R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be
(a) (T – 4) K
(b) (T + 2.4) K
(c) (T – 2.4) K
(d) (T + 4) K
Answer: A
Question. A thermodynamic system goes from states (i) P1, V to 2P1, V (ii) P, V1 to P, 2V1. Then work done in the two cases is
(a) zero, zero
(b) zero, PV1
(c) PV1, zero
(d) PV1, P1V1
Answer: B
Question. Consider two containers A and B containing identical gases at the same pressure, volume and temperature. The gas incontainer A is compressed to half of its original volume isothermally while the gas in container B is compressed to half of its original value adiabatically. The ratio of final pressure of gas in B to that of gas in A is
(a) 2γ-1
(b) (1/2)γ-1
(c) (1/1-γ)2
(d) (1/γ-1)2
Answer: A
Question. In pressure-volume diagram, the isochoric, isothermal, isobaric and iso-entropic parts respectively, are
(a) BA, AD, DC,CB
(b) DC, CB, BA, AD
(c) AB, BC, CD, DA
(d) CD, DA, AB, BC
Answer: D
1. What is the foundation of Thermodynamics?
2. State Carnot’s Theorem?
3. Differentiate between isothermal and adiabatic process?
4. A Carnot engine develops 100 H.P. and operates between 27°C and 227°C. Find
1) thermal efficiency; 2) heat supplied 3) heat rejected?
5. The internal energy of a compressed gas is less than that of the rarified gas at the same temperature. Why?
6. Consider the cyclic process A B C A on a sample 2 mol of an ideal gas as shown. The temperature of the gas at A and B are300 K and 500K respected. Total of 1200 J of heat is with drawn from the sample. Find the work done by the gas in part BC?
7. A refrigerator placed in a room at 300 K has inside temperature 264K. How many calories of heat shall be delivered to the room for each 1 K cal of energy consumed by the refrigerator, ideally?
8. If the door of a refrigerator is kept open in a room, will it make the room warm or cool?
9. Five moles of an ideal gas are taken in a Carnot engine working between 100°C and 30°C. The useful work done in 1 cycle is 420J. Calculate the ratio of the volume of the gas at the end and beginning of the isothermal expansion?
10. The following figure shows a process A B C A per formed on an ideal gas, find the net heat given to the system during the process?
11. A quantity of oxygen is compressed isothermally until its pressure is doubled. It is then allowed to expand adiabatically until its original volume is restored. Find the final pressure in terms of initial pressure? Take Y = 1.4?
Click on link below to download CBSE Class 11 Thermodynamics Worksheet C.
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CBSE Class 11 Physics Chapter 12 Thermodynamics Worksheet
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Worksheet for Physics CBSE Class 11 Chapter 12 Thermodynamics
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Worksheet for CBSE Physics Class 11 Chapter 12 Thermodynamics
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