Free Thermal Equilibrium and Heat MCQs with Answers
277 Thermal Equilibrium and Heat 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 means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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277 questions · page 2 of 14
- A. isochoric processes
- B. isobaric processes
- C. isothermal processes
- D. adiabatic processes
Explanation: Boyle's law states that for a fixed amount of gas at constant temperature, PV = constant, or P is inversely proportional to V.
Correct answer: isothermal processes- A. volume
- B. pressure
- C. absolute temperature
- D. time
Explanation: The average translational kinetic energy of a molecule is (3/2)kT, where k = 1.38 x 10^-23 J K^-1 and T is absolute temperature in kelvin.
Correct answer: absolute temperature- A. Boyles law
- B. Charles law
- C. Ideal gas law
- D. Avagadros law
Explanation: At constant pressure, the ideal-gas law gives V/T = constant, so density ρ = m/V is inversely proportional to absolute temperature T.
Correct answer: Charles law- A. 1 atmosphere
- B. 1 Newton per square meter
- C. 1 Pascal
- D. data is insufficient
Explanation: A mercury column of height 76 cm, equal to 760 mm, at 0°C produces the standard atmospheric pressure of 1 atm.
Correct answer: 1 atmosphere25. Metabolism is the name of a process in which energy transformation takes place within______________?
- A. Heat engine
- B. Human body
- C. Atmosphere
- D. Laboratory
Explanation: Metabolism is the set of chemical reactions in a living organism through which nutrients are converted into usable energy and other…
Correct answer: Human body- A. Frictional process
- B. Chemical processes
- C. Electrical processes
- D. All of the above
Explanation: Heat can be generated by friction, released during chemical reactions, and produced when electrical energy is dissipated as resistance…
Correct answer: All of the above- A. Hyperbola
- B. Parabola
- C. A curve of any shape
- D. A straight lime
Explanation: Boyle's law gives PV = constant at constant temperature, so V = constant × 1/P.
Correct answer: A straight lime- A. The temperatures of water at 0? 100?C
- B. The temperature of melting ice and boiling water at atmospheric pressure
- C. The temperatures of ice cold and boiling water
- D. The temperatures of frozen and boiling mercury
Explanation: Temperature scales use two reproducible reference temperatures: the melting point of ice and the boiling point of water, both measured at…
Correct answer: The temperature of melting ice and boiling water at atmospheric pressure- A. How much heat a body contains
- B. Whether a body will feel hot or cold to touch
- C. In which direction heat will flow between two systems
- D. How much total absolute energy a body has
Explanation: Temperature determines the direction of heat transfer: heat flows spontaneously from the body at higher temperature to the body at lower…
Correct answer: In which direction heat will flow between two systems- A. non-renewable
- B. stable
- C. renewable
- D. none of the above
Explanation: Geothermal energy uses heat from inside the Earth, which is continually replenished by natural geological processes, so it is classified…
Correct answer: renewable- A. heat energy into electrical energy
- B. heat energy into light energy
- C. heat energy into mechanical energy
- D. mechanical energy into heat energy
Explanation: A thermocouple uses the Seebeck effect: a temperature difference between two junctions produces an EMF and hence electrical energy.
Correct answer: heat energy into electrical energy- A. solid
- B. liquid
- C. both
- D. none
Explanation: Linear expansion is the change in length caused by heating and is normally defined for solids, which have a definite shape and length.
Correct answer: solid- A. K
- B. K-1
- C. K -2
- D. none
Explanation: The coefficient of linear expansion is α = change in length/(original length x change in temperature), so its unit is 1/K, written K^-1.
Correct answer: K-1- A. c-32/9
- B. f -32/9 =c/5
- C. f-32/9=c/9
- D. none
Explanation: The temperature scales are related by (F - 32)/9 = C/5, because 32°F corresponds to 0°C and the intervals 180°F and 100°C give the ratio…
Correct answer: f -32/9 =c/5- A. 8g, 100 degree centigrade
- B. 100g ,90 degree centigrade
- C. 92g, 100 degree centigrade
- D. 82g, 100 degree centigrade
Explanation: Given, heat supplied = 22320 calmass of ice = 100glatent heat of fusion of ice = 80 cal/glatent heat of vaporization of water = 540…
Correct answer: 92g, 100 degree centigrade- A. Become minimum
- B. become maximum
- C. become zero
- D. None of these
Explanation: At absolute zero temperature, molecular motion theoretically stops entirely, reducing kinetic energy to zero.
Correct answer: become zero- A. Heat
- B. Temperature
- C. P.E
- D. None of these
Explanation: In the context of molecular motion, temperature is a measure of the average kinetic energy of particles in a substance.
Correct answer: Temperature- A. Adiabatic Process
- B. Isobaric process
- C. Isothermal Process
- D. Isochoric Process
Explanation: In an isobaric process, the pressure remains constant while heat is added or removed from the system.
Correct answer: Isobaric process- A. 60⁰
- B. 280⁰
- C. 360⁰
- D. 160⁰
Explanation: F=2C5/9 C=2C−325/10 C−5/9 C=321/5C=32C=32×5=160
Correct answer: 160⁰- A. convection
- B. conduction
- C. radiaton
- D. all of these
Explanation: Radiation is the fastest mode of heat transfer because it doesn't rely on a medium for propagation.
Correct answer: radiaton