Thermodynamics Physics NEET Questions With Answer

Thermodynamics physics NEET questions Analysis (2020-2024)

Given Below is the detailed analysis of Thermodynamics physics NEET questions

• Marks Contribution: Approximately 4-8 marks in the NEET Chemistry paper.

• Number of Questions: Around 1-2 questions per exam, with some questions integrating numerical-based or process-oriented characteristics.

High Scoring Topics of Thermodynamics

Every year, 1-2 questions are consistently asked from this chapter in the last 10 years NEET question paper thermodynamics physics NEET questions.

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Preparation Strategy For Thermodynamics NEET Questions

1. To do well in thermodynamics physics NEET questions, students must thoroughly understand key concepts like the laws of thermodynamics, thermodynamic processes, and thermodynamic properties such as internal energy, enthalpy, and entropy.

2. thermodynamics NEET questions often involve calculating work done, heat transfer, and changes in thermodynamic properties during various processes, including isothermal, adiabatic, isobaric, and isochoric processes.

3. Practising thermodynamics physics NEET questions is important for learning, as it helps students become familiar with the exam pattern and improve their problem-solving skills.

4. Understanding the first, second, and zeroth laws of thermodynamics is important for solving thermodynamics NEET pyq, as these laws form the foundation of thermodynamic principles.

5. Thermodynamics NEET questions often require the integration of concepts from both chemistry and physics, such as enthalpy changes in chemical reactions and the behaviour of gases in different processes.

6. NEET thermodynamics questions typically include multiple-choice questions (MCQs) that test students' ability to apply thermodynamic principles to solve problems and understand complex processes.

Common Mistakes in Preparing Thermodynamics NEET Questions

Some common mistakes students make while attempting NEET thermodynamics questions:

1. Confusion Between Enthalpy and Entropy: Many students struggle to differentiate between enthalpy (ΔH) and entropy (ΔS). Enthalpy refers to heat content, while entropy measures disorder in a system. Misunderstanding these terms can lead to errors in predicting spontaneity (ΔG = ΔH - TΔS) of reactions.

2. Incorrect Application of Gibbs Free Energy: A common mistake is using Gibbs free energy (ΔG) incorrectly when determining reaction feasibility. Students often miscalculate temperature dependence in ΔG = ΔH - TΔS, forgetting that T must be in Kelvin (K) and not Celsius.

3. Sign Errors in First Law of Thermodynamics: Students frequently confuse the sign conventions in ΔU = Q + W. They forget that work done on the system is positive, while work done by the system is negative. Such errors can lead to incorrect energy calculations in numerical problems.

4. Misunderstanding Heat Capacity (Cp vs. Cv): Confusing Cp (at constant pressure) and Cv (at constant volume) is a common issue. Many students forget the relation Cp - Cv = R and struggle with molar heat capacity calculations in different conditions, leading to mistakes in solving thermodynamic problems.

Thermodynamics NEET Previous Year Question Papers (PYQs)

Here are some questions from Thermodynamics NEET PYQs:

Q1. Which of the following options is the correct relation between change in enthalpy and change in internal energy?

NEET 2023

Difficulty level: Easy

Chapter: Thermodynamics

Option 1:

Option 2:

Option 3:

Option 4:

Solution:

Relation between

Hence, the answer is option (2).

Q2. Which of the following p.V curves represents the maximum work done?

NEET 2022

Difficulty level: Medium

Chapter: Thermodynamics

Option 1:

Option 2:

Option 3:

Option 4:

Solution:

In the P_V curve, the work is equal to the area under the P_V curve.

Graph (I) has the maximum area under the curve, so it will have a maximum area under the curve.

Hence, the answer is option (1).

Q3. The correct option for free expansion of an ideal gas under adiabatic conditions is:

NEET 2020

Difficulty level: Difficult

Chapter: Thermodynamics

Option 1:

Option 2:

Option 3:

Option 4:

Solution:

For an adiabatic process, and free expansion, , Therefore .

The temperature during adiabatic expansion does not change.

Hence, the answer is option (2).

Q4. For the irreversible expansion of an ideal gas under isothermal conditions, the correct option is :

NEET 2021

Difficulty level: Difficult

Chapter: Thermodynamics

Option 1:

Option 2:

Option 3:

Option 4:

Solution:

For the irreversible expansion of an ideal gas under isothermal conditions -

We know that for a spontaneous process, and since the irreversible process is always spontaneous, therefore .

for the isothermal process.

Now,

So,

Correct option .

Hence, the answer is option (3).

Q5. Which of the following is the correct option for the right relationship between and for one mole of ideal gas?

NEET 2021

Difficulty level: Difficult

Chapter: Thermodynamics

Option 1:

Option 2:

Option 3:

Option 4:

Solution:

The relation between for one mole of an ideal gas is given as

.

Hence, the answer is option (3).

Advantages of Practicing Thermodynamics NEET PYQs

1. Increased practice from thermodynamics neet previous year question paper improves confidence in solving thermodynamics questions.

2. Knowledge about the pattern of the exam reduces stress during the exam.

3. Enhances the efficiency in solving questions within the time limit.

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