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Thermodynamics MDCAT MCQs with Answers

Thermodynamics MDCAT MCQs

Welcome to the Thermodynamics MDCAT MCQs with Answers. In this post, we have shared Thermodynamics Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Physics offers a chance to enhance your knowledge regarding Thermodynamics MCQs in this MDCAT Online Test.

Thermodynamics MDCAT MCQs Test Preparations

The first law of thermodynamics is a restatement of the law of:
a) Conservation of energy
b) Conservation of mass
c) Conservation of momentum
d) Conservation of charge

Answer
a) Conservation of energy

The unit of entropy is:
a) Joule
b) Kelvin
c) Joule per Kelvin
d) Newton

Answer
c) Joule per Kelvin

A process in which no heat is exchanged with the surroundings is called:
a) Isothermal
b) Adiabatic
c) Isobaric
d) Isochoric

Answer
b) Adiabatic

The measure of disorder or randomness of a system is called:
a) Enthalpy
b) Entropy
c) Internal energy
d) Gibbs free energy

Answer
b) Entropy

The efficiency of a Carnot engine depends on:
a) The nature of the working substance
b) The pressure of the system
c) The temperature difference between the hot and cold reservoirs
d) The volume of the working substance

Answer
c) The temperature difference between the hot and cold reservoirs

The heat capacity at constant volume is represented by:
a) Cv
b) Cp
c) Q
d) W

Answer
a) Cv

The specific heat capacity of water is:
a) 1 J/g°C
b) 4.18 J/g°C
c) 0.5 J/g°C
d) 2.09 J/g°C

Answer
b) 4.18 J/g°C

In an isothermal process, the internal energy of an ideal gas:
a) Increases
b) Decreases
c) Remains constant
d) First increases, then decreases

Answer
c) Remains constant

For an ideal gas, the internal energy depends only on:
a) Volume
b) Pressure
c) Temperature
d) Entropy

Answer
c) Temperature

The Zeroth law of thermodynamics is related to:
a) Conservation of energy
b) Thermal equilibrium
c) Entropy
d) Enthalpy

Answer
b) Thermal equilibrium

The amount of heat required to raise the temperature of a substance by one degree Celsius is called:
a) Latent heat
b) Specific heat
c) Heat capacity
d) Thermal conductivity

Answer
c) Heat capacity

The change in enthalpy at constant pressure is equal to:
a) Work done
b) Heat absorbed or released
c) Internal energy change
d) Temperature change

Answer
b) Heat absorbed or released

A process that occurs without any change in enthalpy is called:
a) Adiabatic
b) Isochoric
c) Isobaric
d) Isenthalpic

Answer
d) Isenthalpic

The second law of thermodynamics states that:
a) Energy can neither be created nor destroyed
b) The total entropy of an isolated system can never decrease
c) The internal energy of an isolated system is constant
d) Heat flows from a colder to a hotter body

Answer
b) The total entropy of an isolated system can never decrease

In a heat engine, the work done by the system is equal to:
a) The heat absorbed by the system
b) The difference between heat absorbed and heat rejected
c) The sum of heat absorbed and heat rejected
d) The heat rejected by the system

Answer
b) The difference between heat absorbed and heat rejected

The triple point of water is the temperature and pressure at which:
a) Water boils
b) Ice melts
c) Water, ice, and vapor coexist in equilibrium
d) Water freezes

Answer
c) Water, ice, and vapor coexist in equilibrium

The internal energy of an ideal gas is a function of:
a) Volume
b) Temperature
c) Pressure
d) Entropy

Answer
b) Temperature

The work done in a reversible adiabatic process is:
a) Positive
b) Negative
c) Zero
d) Independent of the process

Answer
a) Positive

The Carnot cycle consists of:
a) Two isothermal and two adiabatic processes
b) Two isobaric and two isochoric processes
c) Two adiabatic and two isobaric processes
d) Two isochoric and two isothermal processes

Answer
a) Two isothermal and two adiabatic processes

The coefficient of performance (COP) of a refrigerator is defined as:
a) The ratio of work input to the heat extracted from the cold reservoir
b) The ratio of heat extracted from the cold reservoir to work input
c) The ratio of work input to the heat rejected to the hot reservoir
d) The ratio of heat rejected to the hot reservoir to work input

Answer
b) The ratio of heat extracted from the cold reservoir to work input

An ideal gas undergoes an isothermal expansion at 300K. If the initial pressure is 2 atm and the final pressure is 1 atm, the work done by the gas is:
a) 0 J
b) 8314 J
c) 2078 J
d) 4140 J

Answer
d) 4140 J

The enthalpy change for a reaction is negative. The reaction is:
a) Exothermic
b) Endothermic
c) Isothermal
d) Adiabatic

Answer
a) Exothermic

The work done in an isochoric process is:
a) Positive
b) Negative
c) Zero
d) Maximum

Answer
c) Zero

The entropy change of the universe for a spontaneous process is:
a) Positive
b) Negative
c) Zero
d) Depends on the process

Answer
a) Positive

The maximum efficiency of a heat engine operating between a hot reservoir at 500 K and a cold reservoir at 300 K is:
a) 40%
b) 50%
c) 60%
d) 70%

Answer
c) 60%

The thermodynamic process in which temperature remains constant is called:
a) Isobaric
b) Isochoric
c) Isothermal
d) Adiabatic

Answer
c) Isothermal

The heat absorbed by a system at constant pressure is equal to its:
a) Internal energy change
b) Entropy change
c) Enthalpy change
d) Temperature change

Answer
c) Enthalpy change

The Clausius statement of the second law of thermodynamics states that:
a) Heat can spontaneously flow from a colder to a hotter body
b) Heat cannot spontaneously flow from a colder to a hotter body
c) Work can be converted entirely into heat
d) Heat can be converted entirely into work

Answer
b) Heat cannot spontaneously flow from a colder to a hotter body

The maximum work obtained from a heat engine is called:
a) Mechanical work
b) Useful work
c) Net work
d) Available work

Answer
d) Available work

For an ideal gas, the work done in an isothermal process is proportional to:
a) Temperature
b) Pressure
c) Volume
d) Logarithm of the volume ratio

Answer
d) Logarithm of the volume ratio

The temperature at which the entropy of a perfect crystal becomes zero is:
a) 0°C
b) 273.15 K
c) -273.15°C
d) 0 K

Answer
d) 0 K

The Helmholtz free energy is a measure of:
a) The maximum useful work obtainable from a system at constant temperature and volume
b) The maximum useful work obtainable from a system at constant temperature and pressure
c) The internal energy of a system
d) The enthalpy of a system

Answer
a) The maximum useful work obtainable from a system at constant temperature and volume

The term “thermal conductivity” refers to:
a) The amount of heat required to change the temperature of a substance
b) The ability of a substance to conduct heat
c) The heat absorbed or released during a phase change
d) The resistance to heat flow

Answer
b) The ability of a substance to conduct heat

The phase of a substance with the highest entropy is:
a) Solid
b) Liquid
c) Gas
d) Plasma

Answer
c) Gas

The temperature of an ideal gas is directly proportional to:
a) The pressure at constant volume
b) The volume at constant pressure
c) The number of moles at constant pressure
d) The internal energy at constant volume

Answer
a) The pressure at constant volume

The term “enthalpy” is defined as:
a) The total energy of a system
b) The heat content of a system
c) The work done by a system
d) The change in temperature of a system

Answer
b) The heat content of a system

In a reversible process, the total entropy change of the system and surroundings is:
a) Positive
b) Negative
c) Zero
d) Infinite

Answer
c) Zero

The specific heat capacity at constant pressure (Cp) is always:
a) Less than Cv
b) Equal to Cv
c) Greater than Cv
d) Independent of Cv

Answer
c) Greater than Cv

The term “latent heat” refers to:
a) The heat absorbed or released during a temperature change
b) The heat absorbed or released during a phase change
c) The heat absorbed or released during a chemical reaction
d) The heat absorbed or released during an isothermal process

Answer
b) The heat absorbed or released during a phase change

The Van der Waals equation accounts for:
a) Ideal gas behavior
b) Non-ideal gas behavior
c) Solid-state behavior
d) Liquid-state behavior

Answer
b) Non-ideal gas behavior

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