Preparing for
the National Eligibility cum Entrance Test (NEET) requires thorough
understanding and practice, especially in physics, where Unit 8 - Thermodynamics,
holds significant weightage. To excel in this section, it's crucial to hone
your skills through rigorous practice, including solving Multiple Choice
Questions (MCQs).
In this blog
post, we present a comprehensive set of MCQs focusing on Unit 8 - Thermodynamics,
tailored to help you assess and enhance your preparation for the NEET exam. MCQs
on NEET Physics Unit 8 Thermodynamics cover all topics and questions with
answers that are given in the latest Physics syllabus for NEET.
Syllabus of NEET Physics Unit 8 Thermodynamics
Thermal
equilibrium, zeroth law of thermodynamics, the concept of temperature. Heat,
work, and internal energy. The first law of thermodynamics, isothermal and
adiabatic processes. The second law of thermodynamics: reversible and
irreversible processes.
MCQs on Thermodynamics
1. What is
the first law of thermodynamics?
A) Energy cannot be created nor destroyed,
only transformed
B) Total energy of a system remains constant
C) Energy transfer occurs from higher to
lower temperature
D) Heat and work are interchangeable
Explanation: The correct answer is (B). The first law of thermodynamics, also
known as the law of conservation of energy, states that the total energy of an
isolated system remains constant over time, implying that energy can neither be
created nor destroyed, only transformed from one form to another.
2. Which of
the following is a state function?
A) Heat
B) Work
C) Enthalpy
D) Heat capacity
Explanation: The correct answer is (C). Enthalpy is a state function, meaning it
depends only on the initial and final states of a system and not on the path
taken. Heat and work are not state functions as they depend on the path taken
during a process.
3. Which
process has a positive entropy change?
A) Melting of ice
B) Freezing of water
C) Condensation of steam
D) Evaporation of water
Explanation: The correct answer is (D). Evaporation of water involves an
increase in entropy as water molecules transition from a more ordered liquid
phase to a less ordered gaseous phase, resulting in a positive entropy change.
4. According
to the second law of thermodynamics, which statement is true?
A) Heat always flows from cold to hot
objects
B) Entropy of a system always decreases
C) It is impossible to construct a perpetual
motion machine
D) All energy is convertible into work
completely
Explanation: The correct answer is (C). The second law of thermodynamics states
that it is impossible to construct a device that operates in a cycle and
produces no effect other than the transfer of heat from a colder body to a
hotter body, also known as a perpetual motion machine of the second kind.
5. What is
the efficiency of a Carnot engine operating between two reservoirs at
temperatures T1 and T2?
A) T1 / (T1 - T2)
B) (T1 - T2) / T1
C) (T2 - T1) / T2
D) T2 / (T1 - T2)
Explanation: The correct answer is (B). The efficiency of a Carnot engine is
given by (T1 - T2) / T1, where T1 is the temperature of the hot reservoir and
T2 is the temperature of the cold reservoir.
6. Which of
the following statements about heat engines is correct?
A) Efficiency is always 100%
B) Efficiency depends only on the
temperature of the heat source
C) Efficiency increases with an increase in
the temperature of the heat sink
D) Efficiency is the ratio of work output to
the heat absorbed
Explanation: The correct answer is (D). Efficiency of a heat engine is defined
as the ratio of work output to the heat absorbed, and it is always less than
100%. It depends on both the temperature of the heat source and the temperature
of the heat sink.
7. Entropy is
a measure of:
A) Disorder
B) Internal energy
C) Enthalpy
D) Temperature
Explanation: The correct answer is (A). Entropy is a measure of the disorder or
randomness of a system. It quantifies the number of microscopic configurations
that correspond to a macroscopic state.
8. In an
adiabatic process, which of the following is true?
A) No heat is exchanged with the
surroundings
B) Pressure remains constant
C) Volume remains constant
D) Temperature remains constant
Explanation: The correct answer is (A). In an adiabatic process, no heat is
exchanged with the surroundings, resulting in a change in internal energy
solely due to work done on or by the system.
Mastering Unit 8
- Thermodynamics is pivotal for success in the physics section of the NEET
exam. By regularly practicing MCQs and understanding the underlying concepts,
you can significantly enhance your preparation and boost your confidence on
exam day. Remember, consistent practice and a clear understanding of
fundamental principles are key to achieving your goals. Keep practicing and
best of luck for your NEET exam!
Note: For more
practice, consider exploring additional resources and previous years' NEET
question papers to further strengthen your grasp on thermodynamics concepts.
NEET Physics Mock Test
- NEET Physics Mock Tests
- MCQs on NEET Physics Unit 8 Thermodynamics Quiz Test
- The questions are given in English language only
- You will get 60 seconds to answer each question.
- Know your score when the test is complete
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Disclaimer: The accuracy of NEET Physics Unit 8 Thermodynamics multiple choice questions and answers cannot be claimed to be 100%. Please check the answers yourself. Typing errors may occur.
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