Free Thermodynamics MCQs with Answers
714 Thermodynamics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.
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Read the Thermodynamics notesFree MDCAT chapter notes with key terms714 questions · page 25 of 36
- A. Pressure
- B. Universe
- C. Boundary
- D. Temperature
Explanation: The mass or region outside the system is called the surroundings, and the surface that separates the system and the surroundings is called…
Correct answer: Boundary- A. Momentum, 1 degree C
- B. Heat, 1 degree C
- C. Heat, 2 degree C
- D. Work, 2 degree C
Explanation: Heat capacity is defined as the amount of heat energy required to raise the temperature of a given quantity of matter by one degree…
Correct answer: Heat, 1 degree C- A. Pressure
- B. Volume
- C. Temperature
- D. Mass
Explanation: Thermal equilibrium between two systems is determined by the equality of temperature, as stated by the Zeroth Law of Thermodynamics.
Correct answer: Temperature- A. be doubled.
- B. remain constant
- C. be 1/2 of the original value
- D. be 1/4 of the original value
Explanation: Density is defined as the mass of a substance divided by its volume, mathematically expressed as ρ = m/V.
Correct answer: be 1/2 of the original value- A. volume
- B. pressure
- C. molecule type
- D. absolute temprature
Explanation: In the kinetic theory of gases, temperature is directly related to the average kinetic energy of the gas molecules.
Correct answer: absolute temprature- A. Boyle's law
- B. Charle's law
- C. Avogadro's law
- D. Law of heat exchange
Explanation: Boyle's law gives the relation between pressure and volume at constant temperature (isotherm).
Correct answer: Boyle's law- A. Isochoric process
- B. Adiabatic process
- C. Isobaric process
- D. Isothermal process
Explanation: An isobaric process is a thermodynamic process in which pressure stays constant i.e ΔP=0.An isochoric process is a thermodynamic process…
Correct answer: Isobaric process- A. [M1 L2 T-2 K-1]
- B. [M1 L-3 T-1 K-1]
- C. [M1 L-2 T-1 K-1]
- D. [M1 L-3 T-2 K-1]
Explanation: The ideal gas equation is:PV=nRTWhere:P is pressure with dimensions [ML−1T−2]V is volume with dimensions [L³][n is the number of moles…
Correct answer: [M1 L2 T-2 K-1]- A. Heat Capacity
- B. Heat Volume
- C. Heat Conductor
- D. Heat energy/ unit volume
Explanation: Heat capacity (C) is the amount of thermal energy required to raise the temperature of a substance by one unit (usually one degree Celsius…
Correct answer: Heat Capacity- A. It will expand due to expansion of the air molecules
- B. It will deflate due to contraction of the air molecules
- C. Its size will not be affected by the change in temperature
- D. It will burst.
Explanation: When the football is inflated in a warm room, the air molecules inside the ball are moving rapidly and are spaced farther apart, occupying…
Correct answer: It will deflate due to contraction of the air molecules491. When a gas is compressed isothermally, the product of its pressure and volume during the process is:
- A. Not constant
- B. Constant
- C. Proportional to temperature
- D. Proportional to entropy
Explanation: PV=constant holds for an ideal gas during isothermal compression
Correct answer: Constant- A. relations between heat and mechanical
- B. relations between heat and ionization energies
- C. relations between chemical and mechanical energies
- D. relations between kinetic and potential energies
Explanation: Thermodynamics is that branch of physics in which we study relations between heat and mechanical energies.
Correct answer: relations between heat and mechanical- A. Half
- B. Double
- C. Remain same
- D. Less than double
Explanation: During an isobaric process, the pressure of the gas remains constant. However, the volume of the gas is directly proportional to its…
Correct answer: Less than double- A. TA = 0°C, TB = 100°C
- B. TA = 60°C, TB = 50°C
- C. TA = 45°C, TB = 45°C
- D. TA = 60°C, TB = 40°C
Explanation: Thermal equilibrium occurs when two bodies are in contact with each other and can freely exchange energy.
Correct answer: TA = 45°C, TB = 45°C- A. adiabatic
- B. isothermal
- C. isobaric
- D. isochoric
Explanation: The correct option is B) isothermal, as Boyle's law holds good when the temperature remains constant.
Correct answer: isothermal- A. Heat generation
- B. Heat dissipation
- C. Heat flow
- D. Heat absorption
Explanation: Thermal equilibrium occurs due to heat flow, which is the transfer of heat energy from a higher temperature region to a lower temperature…
Correct answer: Heat flow- A. More molecules strike the tyre wall per second
- B. The molecules are larger
- C. The molecules are farther apart
- D. Each molecule come close to other
Explanation: When air is pumped into a bicycle tire at a constant temperature, the process is considered an isothermal process.
Correct answer: More molecules strike the tyre wall per second- A. Kinetic energy of the molecules
- B. Potential Energy of the molecules
- C. The intermolecular forces between gas molecules
- D. The number of gas molecules
Explanation: For an ideal gas, the internal energy (U) is directly related to its temperature. Heating the gas increases its internal energy.
Correct answer: Kinetic energy of the molecules- A. T1 =T2
- B. T1<T2
- C. T1>T2
- D. None of these
Explanation: Heat transfer occurs from the hotter object to the colder object, as described by the second law of thermodynamics.
Correct answer: T1>T2- A. Electric field
- B. Thermal expansion
- C. Heat engine
- D. Isobaric process
Explanation: Bimetal Thermostats use two different kinds of metal to regulate the temperature setting.
Correct answer: Thermal expansion