# 50+ NEET MCQ Questions Thermodynamics with Solutions - STUDY RATE (2023)

Here we will provide you the 50+ MCQ Questions of Thermodynamics for NEET-UG. Thermodynamics is the chapter 6 in Class XI or Class 11 Chemistry NCERT Unit Thermodynamics NEET (conducted by NTA) is based on the NCERT book.

These 50+ MCQ questions are selected by the experts of studyrate.in and these are more difficult questions, which will help you to better understand Thermodynamics NEET MCQ Questions with Answers.

Which of the following thermodynamic quantities is always negative for a spontaneous process at constant temperature and pressure?
a) Gibbs free energy
b) Enthalpy
c) Entropy
d) Internal energy

The change in entropy of a system undergoing a reversible process between two equilibrium states is given by:
a) ΔS = Q/T
b) ΔS = Qrev/T
c) ΔS = dS/dt
d) ΔS = dU/dT

The standard enthalpy of formation of NH3(g) at 298 K is -46.1 kJ/mol. The standard Gibbs free energy change for the formation of NH3(g) under standard conditions is:
a) -46.1 kJ/mol
b) -16.6 kJ/mol
c) +46.1 kJ/mol
d) +16.6 kJ/mol

The standard Gibbs free energy change for the reaction A(g) + B(g) → C(g) is -50 kJ/mol at 298 K. If the equilibrium constant for the reaction at the same temperature is 10^3, the standard Gibbs free energy change for the reverse reaction is:
a) -50 kJ/mol
b) 50 kJ/mol
c) 24.6 kJ/mol
d) -24.6 kJ/mol

The maximum amount of work that can be obtained from a system at constant temperature and pressure is equal to:
a) ΔG
b) ΔH
c) TΔS
d) -TΔS

Which of the following thermodynamic quantities is not a state function?
a) Internal energy
b) Enthalpy
c) Entropy
d) Heat

For an ideal gas, the internal energy is a function of:
a) Temperature only
b) Pressure only
c) Volume only
d) Temperature and volume

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A system absorbs 500 J of heat and performs 250 J of work. What is the change in internal energy of the system?
a) +250 J
b) -250 J
c) +750 J
d) -750 J

Answer: c) +750 J (ΔU = Q – W = 500 J – 250 J = 250 J; ΔU = Q – W = 500 J + (-250 J) = 250 J)

For a spontaneous process, which of the following statements is true?
a) ΔH > 0 and ΔS > 0
b) ΔH < 0 and ΔS > 0
c) ΔH > 0 and ΔS < 0
d) ΔH < 0 and ΔS < 0

The standard enthalpy of combustion of methane gas (CH4) at 298 K is -890.3 kJ/mol. What is the standard enthalpy of formation of methane gas at 298 K?
a) -74.9 kJ/mol
b) -74.6 kJ/mol
c) -74.4 kJ/mol
d) -74.1 kJ/mol

Answer: a) -74.9 kJ/mol (ΔHf° = ΔHcombustion°/n = -890.3 kJ/mol / 1 mol CH4 = -890.3 kJ/mol; ΔHf° = ΣΔHf°(products) – ΣΔHf°(reactants); ΣΔHf°(CH4) = -74.9 kJ/mol)

Which of the following thermodynamic quantities is an extensive property?
a) Enthalpy
b) Entropy
c) Internal energy
d) Heat capacity

The change in enthalpy of a system undergoing a process at constant pressure is equal to:
a) ΔH = Q
b) ΔH = Q – PΔV
c) ΔH = ΔU + PΔV
d) ΔH = ΔU – PΔV

The entropy of a perfect crystal at absolute zero is:
a) Zero
b) Positive
c) Negative
d) Undefined

The change in Gibbs free energy of a system is given by:
a) ΔG = ΔH – TΔS
b) ΔG = ΔH + TΔS
c) ΔG = ΔU + PΔV
d) ΔG = ΔU – PΔV

Answer: a) ΔG = ΔH – TΔS

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For a spontaneous process, which of the following statements is true?
a) ΔG > 0 and ΔS > 0
b) ΔG < 0 and ΔS > 0
c) ΔG > 0 and ΔS < 0
d) ΔG < 0 and ΔS < 0

Answer: d) ΔG < 0 and ΔS < 0

The work done in an isothermal reversible expansion of an ideal gas is given by:
a) W = nRTln(V2/V1)
b) W = nRTln(P2/P1)
c) W = -nRTln(V2/V1)
d) W = -nRTln(P2/P1)

The standard Gibbs free energy change for the reaction A(g) + B(g) → 2C(g) is +50 kJ/mol at 298 K. If the partial pressure of C is doubled at the same temperature, the standard Gibbs free energy change for the reaction:
a) Remains the same
b) Doubles
c) Halves
d) Becomes zero

The standard entropy of vaporization of water at 100°C is 109.0 J/mol K. What is the standard enthalpy of vaporization of water at 100°C?
a) 40.7 kJ/mol
b) 39.6 kJ/mol
c) 38.7 kJ/mol
d) 37.8 kJ/mol

Answer: b) 39.6 kJ/mol (ΔHvap° = TΔSvap° = (373 K)(109.0 J/mol K) = 40.7 kJ/mol)

The enthalpy change for the reaction H2(g) + 1/2O2(g) → H2O(l) is -285.8 kJ/mol. What is the enthalpy change for the reverse reaction?
a) +285.8 kJ/mol
b) -285.8 kJ/mol
c) -571.6 kJ/mol
d) +571.6 kJ/mol

The heat capacity of a substance is given by:
a) C = ΔH/ΔT
b) C = ΔU/ΔT
c) C = ΔS/ΔT
d) C = Q/ΔT

The Clausius-Clapeyron equation relates:
a) The change in enthalpy with temperature
b) The change in entropy with temperature
c) The change in pressure with temperature
d) The change in volume with temperature

Answer: c) The change in pressure with temperature

The heat capacity of an ideal gas at constant volume is given by:
a) CV = 3/2R
b) CV = 5/2R
c) CV = 7/2R
d) CV = 9/2R

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The standard enthalpy of formation of a substance is defined as:
a) The enthalpy change when one mole of the substance is formed from its elements in their standard states.
b) The enthalpy change when one mole of the substance is burned completely in oxygen.
c) The enthalpy change when one mole of the substance is dissolved in water.
d) The enthalpy change when one mole of the substance is vaporized.

Answer: a) The enthalpy change when one mole of the substance is formed from its elements in their standard states.

The third law of thermodynamics states that:
a) The entropy of a perfect crystal at absolute zero is zero.
b) The entropy of the universe is always increasing.
c) The heat flow between two objects is proportional to their temperature difference.
d) The enthalpy change of a reaction is equal to the sum of the enthalpies of formation of the products minus the sum of the enthalpies of formation of the reactants.

Answer: a) The entropy of a perfect crystal at absolute zero is zero.

The enthalpy change for a reaction is -140 kJ/mol. If the reaction produces 50 g of product, what is the heat released or absorbed by the reaction?
a) -70 kJ
b) -280 kJ
c) +70 kJ
d) +280 kJ

The change in entropy of a system undergoing an isothermal process is given by:
a) ΔS = Q/T
b) ΔS = ΔU/T
c) ΔS = PΔV/T
d) ΔS = ΔH/T

Which of the following is an example of an adiabatic process?
a) A gas is compressed in a cylinder with a piston.
b) A liquid is heated in a beaker on a hot plate.
c) A metal rod is cooled in a water bath.
d) A balloon is allowed to rise in the atmosphere.

Answer: a) A gas is compressed in a cylinder with a piston.

The maximum amount of work that can be obtained from a system is given by:
a) ΔU + ΔH
b) ΔU – ΔH
c) TΔS
d) -TΔS

The Joule-Thomson coefficient of an ideal gas is zero when the gas is:
a) compressed isothermally
b) expanded isothermally

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Which of the following statements is true regarding the Gibbs free energy change (ΔG) for a chemical reaction?
a) ΔG is always positive for an exothermic reaction.
b) ΔG is always negative for an endothermic reaction.
c) ΔG is always negative for a spontaneous reaction at constant temperature and pressure.
d) ΔG is always positive for a spontaneous reaction at constant temperature and pressure.

Answer: c) ΔG is always negative for a spontaneous reaction at constant temperature and pressure.

The standard molar entropy of a substance:
a) is always positive
b) is always negative
c) can be either positive or negative
d) is always zero

Answer: c) can be either positive or negative

The enthalpy change for the reaction 2H2(g) + O2(g) → 2H2O(l) is -571.6 kJ/mol. What is the enthalpy change for the reverse reaction?
a) +571.6 kJ/mol
b) -285.8 kJ/mol
c) -571.6 kJ/mol
d) +285.8 kJ/mol

A system undergoes a process in which the volume remains constant and the temperature increases. Which of the following statements is true regarding the internal energy (ΔU) and the heat (Q) exchanged by the system?
a) ΔU is negative and Q is positive.
b) ΔU is positive and Q is negative.
c) ΔU is positive and Q is positive.
d) ΔU is negative and Q is negative.

Answer: c) ΔU is positive and Q is positive.

The entropy change of a system is given by:
a) ΔS = Q/T
b) ΔS = ΔU/T
c) ΔS = PΔV/T
d) ΔS = ΔH/T

The work done in an isothermal expansion of an ideal gas is given by:
a) W = nRTln(Vf/Vi)
b) W = -PΔV
c) W = -ΔH
d) W = -ΔU

The reversible work done in a process is:
a) always greater than the irreversible work done in the same process
b) always equal to the irreversible work done in the same process
c) always less than the irreversible work done in the same process
d) not related to the irreversible work done in the same process

Answer: b) always equal to the irreversible work done in the same process

The entropy change of the universe for a spontaneous process is:
a) always positive
b) always negative
c) can be either positive or negative
d) is always zero

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We hope there NEET MCQ of Class 11 Thermodynamics will help you to score an excellent rank in NEET-UG. If you have any queries feel free to write in the comments section. We at Study Rate are always ready to serve our students.

## FAQs

### How many questions are asked from thermodynamics in NEET? ›

NEET Chemistry Chapter-wise Weightage 2023
Chapter nameNo. of questions
Thermodynamics1
24
Alcohols, Phenols and Ethers2
Aldehydes, Ketones and Carboxylic Acids4
27 more rows

Is thermodynamics important for NEET? ›

The most important chapters in NEET Physics are Laws of Motion, Thermodynamics, Current Electricity, Magnetic Effects of Current & Magnetism, Semiconductor, Optics, Waves, Work, Energy and Power.

Is thermodynamics important for NEET chemistry? ›

In the do-or-die chapters for NEET, along with the list of important topics, the NEET chapter-wise weightage is also given.
...
Chemistry chapter-wise weightage for NEET 2023.
Name of the ChapterWeightage
Chemical Bonding and molecular structure5%
States of Matter: Gases and liquids2%
Solid-state2%
Thermodynamics9%
25 more rows

What is thermodynamics the study of Mcq? ›

Thermodynamics is the study of energy transformations.

Is thermodynamics 1 easy? ›

Is thermodynamics hard to learn? It is fairly difficult for a lot of people, but by no means impossible. The concepts in thermodynamics tend to be fairly complex, and there's a good amount of elaborate math involved.

How to score 120 in NEET physics? ›

How to Score 120+ in NEET-UG Physics: Mistakes to Avoid
1. Lack of conceptual clarity: Physics involves many complex concepts and formulas. ...
2. Inadequate practice: Physics requires regular practice to master. ...
3. Ignoring NCERT textbooks: NCERT Physics textbooks are an essential resource for NEET Physics preparation.

Why is thermodynamics so hard to learn? ›

In some cases, thermodynamics is hard because the concepts are hard and students often have numerous misconceptions. Many students think an isothermal process is a process without heat transfer. Some concepts cannot be jettisoned from the class in order to make it easier.

How do I prepare for thermodynamics exam? ›

Studying to Pass Thermodynamics Exams

Review your textbook, practice example problems, homework problems, and review solutions over and over. This is all you need to do to be able to pass Thermodynamics class.

Is thermodynamics the hardest? ›

Thermodynamics is a hard class because of the subject matter. Thermodynamics, heat transfer, and fluids are all based on the same core principles and are all infamously known to be very difficult classes. Thermodynamics typically comes before heat transfer and fluids.

Which thermodynamics is better physics or chemistry? ›

Firstly, thermodynamics in chemistry and physics are fundamentally the same. Yet, there is one difference: nothing but the notation of work. This is given by: In physics, the total amount of work done by the system can be seen as positive.

### What is the thermodynamics formula for NEET? ›

Thermodynamics formula

C=q/dT; q = Heat absorbed, dT = rise in temperature. Molar heat capacity = specific heat x molecular weight.

Which chapters are included in thermodynamics for NEET? ›

• Thermal equilibrium and definition of temperature (zeroth law of Thermodynamics). Heat, work and internal energy. First law of thermodynamics. Isothermal and adiabatic processes.
• Second law of the thermodynamics: Reversible and irreversible processes. Heat engines and refrigerators.

Who is the father of thermodynamics *? ›

Nicolas Léonard Sadi Carnot is often described as the “Father of Thermodynamics.”

What is the main subject of thermodynamics? ›

What is thermodynamics? Thermodynamics is the study of the relations between heat, work, temperature, and energy. The laws of thermodynamics describe how the energy in a system changes and whether the system can perform useful work on its surroundings.

What is the first law of thermodynamics in Mcq? ›

The first law of thermodynamics is the law of conservation of energy, that is energy cannot be created or destroyed but is converted from one form to another.

Is there a lot of math in thermodynamics? ›

The differential calculus is heavily used in thermodynamics because thermodynamic quan- tities are functions of thermodynamic variables. For example, a gas can be described by three 6 Page 7 thermodynamic variables (T,V,P).

Can you learn thermodynamics in a week? ›

Ideally it is very difficult to learn Thermodynamics in a week on your own. It is a very conceptual subject. Your concepts need to be very much clear for thorough understanding of subject. However if you still want to give a shot at it, you can refer to Cengel and Boles (for thermodynamics) and video lectures of IIT.

What are the 4 laws of thermodynamic? ›

There are four laws of thermodynamics. They talk about temperature, heat, work, and entropy. They are used in thermodynamics and other sciences, for example chemistry.

How to score 180 in NEET physics? ›

Pro Tips to Score 180 Marks in NEET Physics 2023
1. Clear the concepts first, since Physics is understanding-based. ...
2. For building your base in the numerical section, focus on concepts like “Learning by doing”. ...
3. Try to practice last year's JEE questions. ...
4. Some formula-based questions will not be asked directly.
Jan 8, 2023

What are the most scoring chapters of physics in NEET? ›

Most Important Chapters for NEET Physics
• Motion of System Of Particles and Rigid Body.
• Properties of bulk matter.
• Oscillations and Waves.
• Electrostatics.
• Current Electricity.
• Electromagnetic Induction and Alternating Currents.
• Optics.
• Electronic devices.
Mar 24, 2023

### How do you memorize thermodynamics? ›

A mnemonic used by students to remember the Maxwell relations (in thermodynamics) is "Good Physicists Have Studied Under Very Fine Teachers", which helps them remember the order of the variables in the square, in clockwise direction.

What should I study before thermodynamics? ›

Before studying Thermodynamics, you should know all about the basic concepts of chemistry that include the unit conversions and mole concept, and apart from this, you must know about the kinetic theory of gases also.

What is the hardest part of thermodynamics? ›

What's the hardest thermodynamics concept to understand? For me it's the concept of entropy. Let me enumerate few aspects. Entropy always grows, but on the fundamental level, all laws are reversible.

What are the basic questions in thermodynamics? ›

• What is Thermodynamics? ...
• Define a thermodynamic system. ...
• What are the different types of thermodynamic systems? ...
• What is the zeroth law of Thermodynamics? ...
• What is the first law of Thermodynamics? ...
• What is the second law of Thermodynamics? ...
• What is the third law of Thermodynamics?

Can you take thermodynamics online? ›

Take free online classes and courses in thermodynamics to build your skills and advance your career. Learn thermodynamics and other in-demand subjects with courses from top universities and institutions around the world on edX.

What is the number 1 rule of thermodynamics? ›

The First Law of Thermodynamics states that energy cannot be created or destroyed; it can only be converted from one form to another.

What is the hardest engineering degree? ›

What Is the Hardest Engineering Major?
Top 3 Hardest Engineering MajorsTop 3 Easiest Engineering Majors
1. Chemical engineering (19.66 hours)1. Industrial engineering (15.68 hours)
2. Aero and astronautical engineering (19.24 hours)2. Computer engineering and technology (16.46 hours)
1 more row

What science class is the hardest? ›

Physics 1. As one of the hardest high school classes, this course includes not only algebra but also scientific inquiry and physics. The Advanced Placement (AP) Physics 1 course, which covers topics such as Newtonian physics and electrical charge and force, is often regarded as one of the most challenging AP courses.

What are the 3 laws of thermodynamics? ›

1st Law of Thermodynamics - Energy cannot be created or destroyed. 2nd Law of Thermodynamics - For a spontaneous process, the entropy of the universe increases. 3rd Law of Thermodynamics - A perfect crystal at zero Kelvin has zero entropy.

Is thermodynamics a science or math? ›

Thermodynamics is a physical branch of science that deals with laws governing energy flow from one body to another and energy transformations from one form to another.

### Is thermodynamics and thermochemistry the same for NEET? ›

There are some differences in thermodynamics and thermochemistry because of the purpose. Thermodynamics tells about the rate of the flow of heat whereas thermochemistry can be defined as the type of chemical reaction which happens due to the absorption heat and releasing heat.

Is thermodynamics on the MCAT? ›

In the equation, R = the gas constant (0.00198 kcal/mol/degree Kelvin) and T represents the temperature in Kelvin units. Thermodynamics is an important topic that is always on the MCAT.

What are the important topics of thermodynamics physics for NEET? ›

Important Topics of Thermodynamics
• Thermodynamic Processes.
• First Law of Thermodynamics.
• Second Law of Thermodynamics.
• Third Law of Thermodynamics.
• Enthalpy and Enthalpy Change.
• Specific and Molar Heat Capacity.
• Carnot Cycle.
• Free Energy.

What are the important concepts in thermodynamics for NEET? ›

Important Topics of Thermodynamics

Measurement of Δu and Δh: calorimetry. Enthalpy change. Enthalpies for different types of reactions. Spontaneity.

Which is the easiest chapter in NEET physics? ›

I have answered earlier that the most easiest chapter in physics is thermodynamics which cover 5-6 question of physics in neet ug. And thermodynamics is fully formula based chapter. Another easy chapter is modern physics and wave optics which is also formula based chapter.

Is thermodynamics a important chapter in chemistry? ›

This chapter is one of the most important chapters of the complete chemistry syllabus. Its concepts, laws, numerical and graphs all are important both for the basic foundation of chemistry and for scoring good marks in the examination.

Which class chapter is thermodynamics? ›

Access Class 11 Chemistry Chapter 6 – Chemical Thermodynamics Notes. Thermodynamics: The study of the flow of mass, heat and energy is the study of thermodynamics.

Who discovered the 4 laws of thermodynamics? ›

Both choices were arbitrary. However, although Thomson provided a consistent driving force to develop thermodynamics, in 1850 Clausius actually developed thermodynamics .

What is Carnot's first name? ›

Sadi Carnot, in full Nicolas-léonard-sadi Carnot, (born June 1, 1796, Paris, Fr. —died Aug. 24, 1832, Paris), French scientist who described the Carnot cycle, relating to the theory of heat engines.

Who discovered the 1st law of thermodynamics? ›

In the history of thermodynamics, there is unanimous agreement that the first law of thermodynamics was formulated by Julius Robert Mayer and James Prescot Joule at about the same time in the 1840s.

### What is the zeroth law of thermodynamics? ›

The Zeroth Law of thermodynamics states that there is an energy form called heat, which has the tendency to spread through a system, and a variable called temperature that measures this tendency: heat flows from the regions of high temperature to the regions of low temperature only.

What is an example of the Zeroth Law of Thermodynamics? ›

If the cup of tea is 80°C and the surrounding temperature is 30°C , the tea will lose its heat until its temperature reaches 30 degrees. Here a hot cup of tea acts like the zeroth law of thermodynamics.

Is thermodynamics part of physics or chemistry? ›

Thermodynamics is a very important branch of both physics and chemistry. It deals with the study of energy, the conversion of energy between different forms and the ability of energy to do work.

What is the SI unit of enthalpy? ›

In the International System of Units (SI), the unit of measurement for enthalpy is the joule.

What does entropy occur due to? ›

Explanation: Entropy is related to a number of microscopic configurations. It can have some of the most specified macroscopic variables. These macroscopic variables undergo changes, which lead to a disorder or randomness.

Does enthalpy change with temperature? ›

In general, enthalpy of any substance increases with temperature, which means both the products and the reactants' enthalpies increase.

Is thermodynamics the hardest class? ›

Thermodynamics

Thermodynamics is a hard class because of the subject matter. Thermodynamics, heat transfer, and fluids are all based on the same core principles and are all infamously known to be very difficult classes. Thermodynamics typically comes before heat transfer and fluids.

How many questions should I do from each chapter in NEET? ›

Every year, 12-15 questions from this topic are asked in the NEET exam. This is a simple and high-scoring topic in biology. Human and plant physiology are both important topics for NEET 2023. According to the NEET 2023 scoring scheme, each question is worth four points.

How many questions come from heat and thermodynamics? ›

Heat & Thermodynamics' contribute to about 3-4 questions in jee mains. If you skip these chapters, you are going to be at a great loss. Thermodynamics is also very important for bachelor's degree in Electrical, Mechanical, Civil, Chemical, or even Bio-Technology.

What is the hardest science class in the world? ›

Chemistry is famous for being one of the hardest subjects ever, so it's no surprise that a Chemistry degree is fiercely challenging. Just one topic in Chemistry (for example, organic chemistry) is incredibly complex.

### What is the hardest science class ever? ›

Quantum Physics/Mechanics:

It also requires the memorization of many formulas, which you must then be able to apply to real-life problems. Quantum physics/mechanics deals with very small particles like atoms and subatomic particles and how they work.

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