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Thermodynamics Set-1 MCQ Online Practice Test | Class 11 | Quiz Tweek

Thermodynamics Set-1

Practice Important MCQs for Thermodynamics — Chemistry, Class 11.

Thermodynamics is a fundamental branch of physical chemistry that deals with the quantitative relationship between heat and other forms of energy. For students preparing for board exams and competitive foundations, understanding how energy transitions occur within a system is crucial. This chapter bridges the gap between chemical reactions and the physical laws of energy conservation, providing the tools to predict the spontaneity and extent of chemical processes.

In the CBSE curriculum, this chapter introduces core concepts such as internal energy, enthalpy, entropy, and Gibbs free energy. Mastering these concepts is essential not only for scoring well in Chemistry but also for understanding real-world applications like engine efficiency, chemical synthesis, and biological metabolism. This quiz is designed to test your conceptual clarity, numerical application, and critical thinking based strictly on NCERT guidelines.

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Q1. A system that can exchange both matter and energy with the surroundings is known as:

(A)

Closed system

(B)

Isolated system

(C)

Open system

(D)

Adiabatic system

Q2. Which of the following is an intensive property?

(A)

Mass

(B)

Volume

(C)

Enthalpy

(D)

Temperature

Q3. For an adiabatic process, which of the following is correct?

(A)

$\Delta T = 0$

(B)

$q = 0$

(C)

$w = 0$

(D)

$\Delta V = 0$

Q4. The mathematical expression for the First Law of Thermodynamics is:

(A)

$\Delta U = q + w$

(B)

$\Delta U = q - w$

(C)

$q = \Delta U + w$

(D)

$\Delta H = \Delta U + PV$

Q5. Which of the following is a state function?

(A)

Heat

(B)

Work

(C)

Enthalpy

(D)

Heat capacity

Q6. In an isothermal expansion of an ideal gas into a vacuum (free expansion), the work done is:

(A)

Positive

(B)

Negative

(C)

Zero

(D)

Maximum

Q7. The relation between enthalpy change ( $\Delta H$ ) and internal energy change ( $\Delta U$ ) for a reaction involving gases is:

(A)

$\Delta H = \Delta U + \Delta n_g RT$

(B)

$\Delta U = \Delta H + \Delta n_g RT$

(C)

$\Delta H = \Delta U - \Delta n_g RT$

(D)

$\Delta H = \Delta U + P\Delta V$

Q8. For the reaction $N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)$ , the value of $\Delta n_g$ is:

(A)

(B)

-2

(C)

(D)

-4

Q9. An endothermic reaction is one in which:

(A)

Heat is evolved

(B)

Heat is absorbed

(C)

Temperature increases

(D)

Enthalpy decreases

Q10. The enthalpy of all elements in their standard states at 298 K and 1 bar pressure is:

(A)

Unity

(B)

Zero

(C)

Less than zero

(D)

Different for each element

Q11. Which law states that the total enthalpy change for a reaction is the same whether it occurs in one step or multiple steps?

(A)

Le Chatelier's Principle

(B)

Hess’s Law

(C)

Joule-Thomson Effect

(D)

First Law of Thermodynamics

Q12. For a process to be spontaneous at all temperatures, the conditions must be:

(A)

$\Delta H > 0$ and $\Delta S < 0$

(B)

$\Delta H < 0$ and $\Delta S > 0$

(C)

$\Delta H < 0$ and $\Delta S < 0$

(D)

$\Delta H > 0$ and $\Delta S > 0$

Q13. The measure of randomness or disorder in a system is called:

(A)

Enthalpy

(B)

Internal Energy

(C)

Entropy

(D)

Gibbs Energy

Q14. For the process of sublimation of iodine, the sign of $\Delta S$ is:

(A)

Positive

(B)

Negative

(C)

Zero

(D)

Unpredictable

Q15. The criteria for equilibrium at constant temperature and pressure is:

(A)

$\Delta G > 0$

(B)

$\Delta G < 0$

(C)

$\Delta G = 0$

(D)

$\Delta S = 0$

...and 15 more challenging questions available in the interactive simulator.

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