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 6 of 14
- A. 537.1 x 10^-5 m
- B. 447.5 x 10^-5 m
- C. 327.5 x 10^-5 m
- D. 247.5 x 10^-5 m
- E. 127.5 x 10^-5 m
Explanation: The increase in length of the steel rod is calculated using the linear expansion formula: ΔL=L0⋅α⋅ΔT, where L0 is the initial length, α is…
Correct answer: 247.5 x 10^-5 m- 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. Decreasing the applied pressure
- B. Increasing the applied pressure
- C. Increasing the applied pressure with double force
- D. Increasing the weight
Explanation: Boyle's law: states that the volume of a given amount of gas held at constant temperature varies inversely with the applied pressure when…
Correct answer: Decreasing the applied pressure- A. 22.22%
- B. 23.23%
- C. 25.25%
- D. 30.30%
Explanation: The efficiency of the Carnot engine working between 177°C and 77°C will be 22.22%.Right answer is A.Explanation:T1=177°C + 273=450…
Correct answer: 22.22%- A. 1/100.6
- B. 1/273.16
- C. 1/32.6
- D. 1/241.6
- E. 1/115.7
Explanation: The Kelvin scale is defined by the International System of Units (SI) such that one Kelvin is exactly 1/273.16 of the thermodynamic…
Correct answer: 1/273.16- A. 8 g and 100 degrees centigrade
- B. 100 g and 90 degrees centigrade
- C. 92 g and 100 degrees centigrade
- D. 82g and 100 degrees 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: 92 g and 100 degrees centigrade- A. Gets negligible
- B. Gets constant
- C. Rises
- D. Falls
Explanation: Gay-Lussac's Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the…
Correct answer: Rises- A. P = ⅓ Nm/v2 (c2)
- B. P = ⅓ Nm/v2 (c)
- C. P = ⅓ Nm/v (c2)
- D. P = ⅕ Nm2 / v (c2)
- E. P = ⅓ N2m2/v (c2)
Explanation: The dimensions of pressure can be expressed as force per unit area, or [M L-1 T-2].Using the method of dimensions, we can check which…
Correct answer: P = ⅓ Nm/v (c2)- A. 327 K
- B. 177 C
- C. 873 K
- D. 600 oC
Explanation: Option A: 327 K. This is the temperature if the volume of the gas doubles.
Correct answer: 177 C- 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: Option A: The pressure of the gas will increase by a factor of 4.This is because the ideal gas law states that the pressure of a gas is…
Correct answer: Pressure increases by a factor of 4- A. 359.4
- B. -459.4
- C. 100
- D. -259.4
Explanation: Absolute zero, is temperature at which a thermodynamic system has the lowest energy.
Correct answer: -459.4- A. P/cR
- B. PR/c
- C. Pc/R
- D. cPR
Explanation: Since Q=mctAnd according to the question, Q=P, c=c, and t=RWhen we place the values in the equation making m the subjectm=P/cR
Correct answer: P/cR- A. Decrease in the internal energy
- B. Increase in the internal energy
- C. Increase in the potential energy only
- D. Decrease in the kinetic energy only
Explanation: Heat, once absorbed as energy, contributes to the overall internal energy of the object.
Correct answer: Increase in the internal energy- A. It increases
- B. It decreases
- C. It remains the same
- D. It decreases with the square of temperature
Explanation: When the temperature increases, the length of the pendulum also increases and hence its time period increases.
Correct answer: It increases- A. 1.5 kg of the material is to be heated by 7.0 C0
- B. 3.0 kg of the material is to be heated by 3.5 C0
- C. 0.50 kg of the material is to be heated by 2 1 C0
- D. The amount of heat required is the same in each of the three previous cases
Explanation: Q=m x c x (change in temperature)Since the material is the same c does not change.
Correct answer: The amount of heat required is the same in each of the three previous cases- A. 77°C
- B. -77°C
- C. 623 °C
- D. -623 °C
Explanation: Correct option is A.C = K - 273.15C=350 K-273.15C=76.85 degrees celsiusAs this is a numerical thus it can only have one correct option.
Correct answer: 77°C- A. Energy travels from the larger object to the smaller object
- B. Energy travels from the object with more mass to the one with less mass
- C. Energy travels from the object at a higher temperature to the object at a lower temperature
- D. Energy does not travel
Explanation: Correct option is C.The energy travels from the object at higher temperature to the object at lower temperature.Equilibrium is the…
Correct answer: Energy travels from the object at a higher temperature to the object at a lower temperature118. How are clouds made?
- A. When water absorbs heat
- B. When ice melts
- C. When it is too hot
- D. When water releases heat
Explanation: Clouds are formed when water vapors condense to form water droplets (an exothermic process, so heat is released), which form a floating…
Correct answer: When water releases heat- A. Isochoric
- B. Isothermal
- C. Adiabatic
- D. Isobaric
Explanation: The living system works in isothermal conditions i.e the temperature of the body remains constant due to thermoregulatory mechanisms.
Correct answer: Isothermal- A. Calorie
- B. Kilojoule
- C. Joule
- D. Calories/gram
Explanation: The heat of vaporization (ΔHv) is defined as the energy (Q) required to vaporize 1g of a liquid without any change in its temperature.
Correct answer: Calories/gram