 # Physics NEET MCQs on Thermodynamics

### Important Physics NEET MCQs On Thermodynamics

In National Eligibility cum Entrance Test (NEET), physics plays a crucial role as this paper carries 180 marks. Therefore, if you are an NEET aspirant, you must have a clear idea about chapter-wise weightage.

Thermodynamics is one of the chapters from which 5 to 10 questions are asked each year. Hence, learn the section minutely followed by solving thermodynamics mcq for a complete grasp on the topic.

Along with that also take a glance at previous years’ thermodynamics NEET questions for a better understanding of the question pattern. As a matter of fact, a total of 45 questions will be asked from Physics.

### MCQ On Thermodynamics

Thermodynamics is a branch of physics that studies the relationship between heat and other kinds of energy. It has four fundamental laws.

• Zeroth law of thermodynamics.

• First law of thermodynamics.

• Second law of thermodynamics.

• Third law of thermodynamics.

Following are a Few Vital Thermodynamics MCQ Collated for Your Convenience.

1. “Heat cannot by itself flow from a body at a lower temperature to a body at a higher temperature”- the statement is which of the following?

1. First law of thermodynamics.

2. Conservation of mass.

3. Conservation of momentum.

4. Second law of thermodynamics.

2. Helium gas passes through a cycle ABCDA (containing two isobaric and isochoric lines) shown in the fig. Find the efficiency of the cycle. (Assume the gas to be close to ideal gas)

1. 15.4%.

2. 12.5%.

3. 10.5%.

4. 9.1%.

3. A Carnot engine, containing efficiency of ɳ=1/10 as heat engine and used as a refrigerator. The work done on the system is 10 J. Calculate the amount of energy absorbed at lower temperature from the reservoir.

1. 1 J.

2. 90 J.

3. 99 J.

4. 100 J.

4. Which statement is false?

1. Carnot cycle is reversible.

2. A reversible cycle is more efficient than irreversible one.

3. Carnot cycle is the most efficient among all cycles.

4. All reversible cycle has same efficiency.

5. The coefficient of performance of a refrigerator is 5. If the temperature inside said refrigerator is -20⁰ C. Calculate the temperature of the surrounding where it releases heat.

1. 11⁰ C.

2. 21⁰ C.

3. 31⁰ C.

4. 41⁰ C.

6. 1 mole of an ideal diatomic gas passes through a transition from A to B along the path AB.

During the transition, what is the change in internal energy of the gas?

1. -20 kJ

2. 20 kJ

3. -12 KJ

4. 20 J

7. An ideal gas is compressed to half of its initial volume by several processes. Which process results in the maximum work done on the gas?

1. Isothermal.

2. Isobaric.

4. Isochoric.

8. The specific heat capacity of metal at low temperature (T) is

A 100-gram vessel of this metal is to be cooled down from 20 K to 4 K by a particular refrigerator functioning at home temperature (27 K). The amount of work required to cool down the vessel is –

1. Equal to 0.002 kJ.

2. Between 0.148 kJ and 0.028 kJ.

3. Greater than 0.148 kJ.

4. Less than 0.028 kJ.

9. The work done in an adiabatic change in a gas solely depends on –

1. Change in temperature.

2. A change in pressure.

3. Change in volume.

4. None of the above.

10. What happens when a gas expands adiabatically?

1. No energy is needed for expansion.

2. Law of conservation of energy is inapplicable.

3. Energy is needed and comes from the wall of the gas’s container.

4. Internal energy of the gas is used in doing work.

11. Can two isothermal curves cut each other?

1. Never.

2. Yes.

3. Yes, during critical pressure.

4. They can cut when the temperature is 0⁰ C.

12. When an ideal monatomic gas is heated at constant pressure, the fraction of heat energy that increases the internal energy of the gas is –

1. 2/5

2. 3/5

3. 3/7

4. 5/7

13. 110 J heat is added to a gaseous system whose internal energy is 40 J. What is the amount of external work done?

1. 150 J

2. 110 J

3. 40 J

4. 70 J

14. The internal energy of an ideal gas depends on –

1. Specific volume.

2. Pressure.

3. Density.

4. Temperature.

15. The value of heat generated when 36.5 gm HCl and 40 gm of NaOH react during neutralisation –

1. 13.7 kcal.

2. 76.5 kcal.

3. 108 kcal.

4. More than 13.7 kcal.

 1.d) 4.d) 7.c) 10.d) 13.c) 2.a) 5.c) 8.b) 11.a) 14.d) 3.b) 6.a) 9.a) 12.b) 15.a)

These are a few thermodynamics mcq that you can practise and can expect in NEET 2020

### Pop Quiz

State True/False: In a cyclic process, the internal energy of the gas remains constant.

Having a smart study schedule is the first step towards being successful in important exams like NEET. Since Physics is a complicated and application-oriented subject, the candidates should pay special attention from the very beginning. For that, you can start with thermodynamics objective questions.

Along with practising ample thermodynamics mcq, do not forget to revise the other chapters as well. Furthermore, try to stick to the daily study schedule, but in the process do not neglect your health.