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 10 of 14
- 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- A. 98.6 oF
- B. 40 oC
- C. 37 oC
- D. 459.4 oC
Explanation: Option A: A temperature of 98.6 degrees Fahrenheit is equivalent to 37 degrees Celsius.
Correct answer: 37 oC191. One kcal = _.
- A. 4.18 J
- B. 4180 J
- C. 2.09 J
- D. 2090 J
Explanation: A calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius.
Correct answer: 4180 J- A. 1260 W
- B. 12.6 kW
- C. 210 W
- D. 12.6 W
Explanation: t= 5 min = 5*60 = 300 secm= 500 gΔT change in temperature = 50°C-20°C = 30°Cc= 4.2Q [heat supplied/energy] = mcΔT = 500*4.2*30 = 63,000 J…
Correct answer: 210 W- A. Reversible
- B. Irreversible
- C. Depends on the conditions
- D. Conduction process
Explanation: In heat conduction, heat is transferred from one place to another. This process is not reversible.
Correct answer: Irreversible- A. 28 min
- B. 16.7 min
- C. 2.8 min
- D. 167 min
Explanation: Given : Power = 100 watt Specific latent heat of fusion = L = 334 j/g M = 50 g Since we know that Q= ml Where Q is the heat energy ,thus…
Correct answer: 2.8 min- A. 90 g
- B. 90 kg
- C. 1.5 g
- D. 1.5 kg
Explanation: Q = ml Q = E = pt 100 x 5 x 60 = 30,000J 30,000 = m x 334 m = 30,000/334 = 89.8 ≈ 90g approximately.
Correct answer: 90 g- A. -223K
- B. 223K
- C. -323K
- D. 323K
Explanation: Conversion of Temperature from Celsius to Kelvin:TK = TC + 273TK = -50oC + 273TK = 223 KHence, B is the correct option.
Correct answer: 223K- A. 140°C
- B. 60°C
- C. 0.2°C
- D. 14°C
Explanation: Power = 100 WWeight of water = 500 g Time = 5 min specific heat = 4.2 J/ gC use formula p × t = m*s*δ t (100 × 5 × 60) j = 500 g × 4.2…
Correct answer: 60°C- A. Infinite
- B. Zero
- C. Double the temperature
- D. None of these options are correct
Explanation: Option B is correct since if the temperatures of the two bodies are equal, there will be no transfer of heat energy as heat is an energy…
Correct answer: Zero- A. Pressure increases by a factor of 4
- B. Pressure decreases by a factor of 4
- C. Pressure decreases by a factor of 2
- D. Pressure increases by a factor of 2
- E. No change in pressure
Explanation: According to combined gas law, P1V1/T1 = P2V2/T2, The volume is constant so we can say that pressure and temperature are directly…
Correct answer: Pressure increases by a factor of 4- 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