NCERT Solutions for class 11 Physics | Chapter 12 - Thermodynamics

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Questions
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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