Thermodynamics Practice Questions
Class 11 · Chemistry · 1764 free MCQs with instant results and detailed explanations.
1764
Total
667
Easy
796
Medium
301
Hard
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Topics in Thermodynamics
First Law
386
Gibbs Energy
346
Entropy
385
Hess's Law
278
Enthalpy
369
Sample Questions from Thermodynamics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What does the First Law of Thermodynamics state?
A.
Energy cannot be created or destroyed.
B.
Energy can be created from nothing.
C.
Only mechanical energy is conserved.
D.
Heat and work are not forms of energy.
Show Answer & Explanation
Correct Answer: A
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another.
Q2
Easy
In an isothermal process, which of the following remains constant?
A.
Temperature
B.
Pressure
C.
Volume
D.
Internal Energy
Show Answer & Explanation
Correct Answer: A
In an isothermal process, the temperature of the system remains constant throughout the process.
Q3
Easy
Which of the following is an extensive property?
A.
Temperature
B.
Pressure
C.
Volume
D.
Density
Show Answer & Explanation
Correct Answer: C
Volume is an extensive property because it depends on the size or amount of the substance.
Q4
Medium
What is the First Law of Thermodynamics commonly known as?
A.
Law of Conservation of Energy
B.
Law of Entropy
C.
Law of Chemical Equilibrium
D.
Law of Gas Constant
Show Answer & Explanation
Correct Answer: A
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed. This is known as the Law of Conservation of Energy.
Q5
Medium
Which of the following statements is NOT true about the First Law of Thermodynamics?
A.
Energy can be converted from one form to another.
B.
The total energy of an isolated system remains constant.
C.
Heat and work are state functions.
D.
Internal energy is a state function.
Show Answer & Explanation
Correct Answer: C
Heat and work are not state functions; they depend on the path taken during a process, while internal energy is a state function.
Q6
Medium
What happens to the internal energy of an ideal gas when it expands isothermally?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies with pressure
Show Answer & Explanation
Correct Answer: C
For an ideal gas in an isothermal expansion, the temperature remains constant, hence the internal energy also remains constant.
Q7
Medium
Which of the following is an extensive property?
A.
Temperature
B.
Pressure
C.
Internal Energy
D.
Density
Show Answer & Explanation
Correct Answer: C
Internal energy is an extensive property as it depends on the amount of substance present in the system.
Q8
Hard
In an isothermal expansion of an ideal gas, which of the following statements is true?
A.
The internal energy of the gas remains constant.
B.
The internal energy of the gas increases.
C.
Work done on the gas is positive.
D.
Heat is absorbed from the surroundings.
Show Answer & Explanation
Correct Answer: A
In an isothermal process, the temperature remains constant, meaning the internal energy of an ideal gas does not change.
Q9
Hard
Which of the following processes represents an adiabatic process?
A.
A gas is compressed slowly in a piston.
B.
A gas expands rapidly into a vacuum.
C.
A gas is heated in a container with constant temperature.
D.
A gas is allowed to expand with no heat transfer.
Show Answer & Explanation
Correct Answer: D
An adiabatic process is characterized by no heat exchange with the surroundings, typically involving rapid expansion or compression.
Q10
Hard
In a cyclic process, what can be said about the change in internal energy?
A.
It is equal to zero.
B.
It is equal to the total heat added to the system.
C.
It is equal to the total work done by the system.
D.
It depends on the path taken.
Show Answer & Explanation
Correct Answer: A
In a cyclic process, the system returns to its initial state, hence the change in internal energy is zero.
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Thermodynamics — Class 11 Chemistry Practice Questions Online
This page contains 1764 practice MCQs for the chapter Thermodynamics in Class 11 Chemistry. The questions are organized by difficulty — 667 easy, 796 medium, 301 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.