NCERT · CLASS XI · PHYSICS

Thermodynamics True–False Concept Scan for Chapter 11

This 25-statement True–False module scans the conceptual core of thermodynamics—laws of thermodynamics, heat, work, entropy, and heat engines—so you can quickly identify which ideas about energy transfer and thermodynamic processes are truly clear and which require revision.

Laws of thermodynamics Processes & work Entropy & irreversibility Carnot engine
Start the True–False run ↷ Answer in one pass and then analyze your concept-wise performance on academia-aeternum.com.
WHY THIS FORMAT WORKS

True–False questions expose conceptual gaps

Thermodynamics often involves subtle conceptual distinctions: heat versus internal energy, reversible versus irreversible processes, and entropy versus energy. True–False statements force you to evaluate each claim carefully and decide whether it agrees with the fundamental laws of thermodynamics.

CONCEPT AXES INSIDE THESE 25 STATEMENTS

Core Thermodynamics Ideas Being Tested

Thermodynamic systems

Understanding macroscopic variables like pressure, volume, temperature and how a thermodynamic system interacts with surroundings.

First law of thermodynamics

Energy conservation in thermal systems using \(\Delta U = Q - W\) and interpretation of heat and work.

Thermodynamic processes

Isothermal, adiabatic, quasi-static and cyclic processes, and how work and heat behave in each case.

Entropy & second law

Understanding irreversibility, entropy increase, and the direction of spontaneous processes.

Heat engines

Carnot engine, efficiency limits, and why no real engine can exceed reversible efficiency.

LEARNING OUTCOMES

What this True–False set trains you to do

  • Identify correct thermodynamic principles behind heat transfer, work, and energy conservation.
  • Recognize reversible vs irreversible processes and understand entropy changes.
  • Apply the first and second laws to cyclic processes and heat engines.
  • Understand thermodynamic equilibrium involving thermal, mechanical, and chemical equilibrium.
  • Analyze efficiency limits of heat engines and Carnot cycles.
Your Progress 0 / 25 attempted
Q 01 / 25
Thermodynamics mainly deals with macroscopic quantities like pressure, volume, and temperature of a system.
Q 02 / 25
A thermodynamic system is always the entire universe including surroundings.
Q 03 / 25
In thermodynamic equilibrium, the system must be in thermal, mechanical, and chemical equilibrium simultaneously.
Q 04 / 25
Temperature is the property that decides the direction of spontaneous heat flow between two bodies in contact.
Q 05 / 25
A quasi-static process is one that proceeds infinitely slowly so that the system passes through a continuous sequence of equilibrium states.
Q 06 / 25
The work done by a gas in a quasi-static pressure–volume process is equal to the area under the P–T curve.
Q 07 / 25
Heat and work are state functions because their values depend only on the initial and final states of the system.
Q 08 / 25
Internal energy of an ideal gas depends only on its temperature and not on its volume or pressure.
Q 09 / 25
For a cyclic process, the change in internal energy of the system over one complete cycle is zero.
Q 10 / 25
In an isothermal expansion of an ideal gas, the internal energy increases because the gas does work on the surroundings.
Q 11 / 25
In an adiabatic process, the system does not exchange heat with its surroundings, but it can still do work.
Q 12 / 25
A free expansion of an ideal gas into vacuum is an isothermal process in which the gas does maximum work.
Q 13 / 25
The first law of thermodynamics can be written for a closed system as \(\Delta U = Q - W\), where \(W\) is the work done by the system.
Q 14 / 25
If a system undergoes a process for which \(Q = 0\;W = 0\), then its internal energy must remain constant.
Q 15 / 25
\(\text{Enthalpy }H\) of a system is defined as \(H = U - PV\).
Q 16 / 25
At constant pressure, the heat supplied to a system equals the change in its enthalpy for a process in which only \(PV\text{ work is involved.}\)
Q 17 / 25
For one mole of an ideal gas, the difference between molar heat capacities at constant pressure and constant volume is equal to the universal gas constant \(R\).
Q 18 / 25
In all reversible cycles, the net entropy change of the system over one full cycle is positive.
Q 19 / 25
If two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.
Q 20 / 25
The efficiency of any heat engine operating between two given thermal reservoirs can never exceed that of a reversible engine operating between the same reservoirs.
Q 21 / 25
For a Carnot engine operating between temperatures \(T_1\) and \(T_2\ (T_1 > T_2)\), the efficiency decreases if both \(T_1\) and \(T_2\) are multiplied by the same factor.
Q 22 / 25
In any reversible adiabatic expansion of an ideal gas, both entropy and temperature of the gas decrease.
Q 23 / 25
The entropy change of the universe for any real (irreversible) process is always greater than zero.
Q 24 / 25
During the free expansion of an ideal gas into a vacuum, the entropy of the gas remains constant because its internal energy does not change.
Q 25 / 25
A process in which the entropy of an isolated system decreases can occur if the internal energy of the system decreases sufficiently.
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