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NCERT Solutions for class 11 Physics | Chapter 12 - Thermodynamics

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Free download in PDF Class 11 Physics Chapter 12 Thermodynamics Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) When an ideal monatomic gas is heated at constant pressure, the fraction of heat energy that increases the internal energy of the gas is –
[A] 2/5
[B] 3/5
[C] 3/7
[D] 5/7
Answer: 3/5
(2) What happens when a gas expands adiabatically?
[A] No energy is needed for expansion.
[B] Law of conservation of energy is inapplicable.
[C] Energy is needed and comes from the wall of the gas’s container.
[D] Internal energy of the gas is used in doing work.
Answer: Internal energy of the gas is used in doing work.

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(3) An ideal gas is compressed to half of its initial volume by several processes. Which process results in the maximum work done on the gas?
[A] Isothermal
[B] Isobaric
[C] Adiabatic
[D] Isochoric
Answer: Adiabatic
(4) The work done in an adiabatic change in a gas solely depends on –
[A] Change in temperature.
[B] A change in pressure.
[C] Change in volume.
[D] None of the above.
Answer: Change in temperature.
(5) The value of heat generated when 36.5 gm HCl and 40 gm of NaOH react during neutralisation –
[A] 13.7 kcal.
[B] 76.5 kcal.
[C] 108 kcal.
[D] More than 13.7 kcal.
Answer: 13.7 kcal.
(6) A Carnot engine, containing efficiency of ɳ=1/10 as heat engine and used as a refrigerator. The work done on the system is 10 J. Calculate the amount of energy absorbed at lower temperature from the reservoir.
[A] 1 J.
[B] 90 J.
[C] 99 J.
[D] 100 J.
Answer: 90 J.
(7) “Heat cannot by itself flow from a body at a lower temperature to a body at a higher temperature”- the statement is which of the following?
[A] First law of thermodynamics.
[B] Conservation of mass.
[C] Conservation of momentum.
[D] Second law of thermodynamics.
Answer: Second law of thermodynamics.
(8) The internal energy of an ideal gas depends on –
[A] Specific volume.
[B] Pressure.
[C] Density.
[D] Temperature.
Answer: Temperature.
(9) The specific heat capacity of metal at low temperature (T) is

A 100-gram vessel of this metal is to be cooled down from 20 K to 4 K by a particular refrigerator functioning at home temperature (27 K). The amount of work required to cool down the vessel is –

[A] Equal to 0.002 kJ.
[B] Between 0.148 kJ and 0.028 kJ.
[C] Greater than 0.148 kJ.
[D] Less than 0.028 kJ.
Answer: Between 0.148 kJ and 0.028 kJ.
(10) 110 J heat is added to a gaseous system whose internal energy is 40 J. What is the amount of external work done?
[A] 150 J
[B] 110 J
[C] 40 J
[D] 70 J
Answer: 40 J
(11) Can two isothermal curves cut each other?
[A] Never
[B] Yes.
[C] Yes, during critical pressure.
[D] They can cut when the temperature is 0°C.
Answer: Never
(12) Which statement is false?
[A] Carnot cycle is reversible.
[B] A reversible cycle is more efficient than irreversible one.
[C] Carnot cycle is the most efficient among all cycles.
[D] All reversible cycle has same efficiency.
Answer: All reversible cycle has same efficiency.
(13) The coefficient of performance of a refrigerator is 5. If the temperature inside said refrigerator is -20° C. Calculate the temperature of the surrounding where it releases heat.
[A] 11° C.
[B] 21° C.
[C] 31° C.
[D] 41° C.
Answer: 31° C.
(14) Which of the following is the largest unit of energy
[A] Electron volt
[B] Joule
[C] Calorie
[D] Erg
Answer: Calorie
(15) For all the reactions what is the nature of the chemical dissociation?
[A] Exothermic
[B] Reversible
[C] Endothermic
[D] Reversible and endothermic
Answer: Reversible and endothermic
(16) What is a necessary condition for a reaction to be spontaneous at all temperatures?
[A] ΔH < ΔG
[B] ΔG and ΔH should be positive
[C] ΔH = ΔG = 0
[D] ΔG and ΔH should be negative
Answer: ΔG and ΔH should be negative
(17) Select the incorrect statement
[A] For the triple point of water, 1°K is equal to 1/273.16.
[B] The first law of thermodynamics is also known as the law of thermal equilibrium
[C] The triple point of water is one of the reference points on the thermodynamic scale of temperature
[D] At room temperature, the heat of combustion is not found
Answer: At room temperature, the heat of combustion is not found
(18) A gas is compressed to half of its initial volume isothermally. The same gas is compressed again until the volume reduces to half through an adiabatic process. Then
[A] Work done during isothermal compression is more
[B] Work done is independent of the processes used for compression
[C] Work done is more during the adiabatic process
[D] Work done is dependent on the atomicity of the gas
Answer: Work done is more during the adiabatic process
(19) The coefficient performance of a refrigerator is 5. If the temperature inside the freezer is -20℃, calculate the heat rejected to the surrounding
[A] 11℃
[B] 41℃
[C] 21℃
[D] 31℃
Answer: 31℃
(20) What is the ratio of Cp/Cv for gas if the pressure of the gas is proportional to the cube of its temperature and the process is an adiabatic process.
[A] 2
[B] 3/2
[C] 4/3
[D] 5/3
Answer: 3/2

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