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 11 of 14
- A. 8.314 J mol-31K-3
- B. 1.38J mole-1 K-3
- C. 1.38J mole-1 K-1
- D. 8.314 J mole-1 K-1
Explanation: Physically, the gas constant is the constant of proportionality that relates the energy scale in physics to the temperature scale, when a…
Correct answer: 8.314 J mole-1 K-1- A. NR/p
- B. NRp
- C. Nk/p
- D. Nkp
Explanation: We know that PV= NkT where P is the pressure and k is the Boltzman constant PV= NkT V= NkT/P V= (Nk/P)T (1) Equation of a straight line =Y…
Correct answer: Nk/p- A. Volume decreased, temperature decreased
- B. Volume decreased, temperature increased
- C. Volume increased, temperature decreased
- D. Volume increased, temperature increased
Explanation: An experimental gas law that describes the relationship between pressure and volume of a confined (Boyle's Law).
Correct answer: Volume increased, temperature decreased- A. 77°C
- B. -77°C
- C. 623 °C
- D. -623 °C
Explanation: Correct option is A. C = K - 273.15 C=350 K-273.15 C=76.85 degrees celsius As this is a numerical thus it can only have one correct option.
Correct answer: 77°C- A. Conduction only
- B. Convection only
- C. Radiation only
- D. None of these
Explanation: Initially, the water in the lake is cooled by convection as colder air makes contact with the water's surface, causing the surface water…
Correct answer: Conduction only- A. Convection
- B. Conduction
- C. Radiation
- D. Conduction and convection both
Explanation: The correct answer is convection. In this scenario, the heat from the warmer water is transferred to the ice cube primarily through…
Correct answer: Convection- A. The rubber pipe expanded when heated, allowing it to fit over the tap
- B. The plastic tap deformed due to the heat from the hair dryer
- C. Heat caused a chemical reaction leading to adhesion between the rubber and plastic
- D. None of the above options are correct
Explanation: The correct answer is that the rubber pipe expanded due to the heat from the hair dryer.
Correct answer: The rubber pipe expanded when heated, allowing it to fit over the tap- A. 3/2 α
- B. 5/2 α
- C. 5/3 α
- D. None of these
Explanation: To find the average coefficient of linear expansion for the composite rod, we calculate a weighted average based on the lengths of the…
Correct answer: 5/3 α- A. 7/8
- B. 8/7
- C. 3/8
- D. 5/8
Explanation: In an insulated system, the energy lost by the water that freezes must equal the energy required to vaporize the remaining water.
Correct answer: 7/8- A. Water equivalent
- B. Temperature gradient
- C. Thermal capacity
- D. Specific heat
Explanation: Option C is correct. Thermal capacity, or heat capacity, is the overall amount of heat required to raise the temperature of a given mass…
Correct answer: Thermal capacity- A. 30g
- B. 80g
- C. 150g
- D. 1600g
Explanation: Option A is correct.Heat contained in waterQ=msΔT (s=1cal/gm/ o C) Q=80×1×(30−0)Q=2400Cal Then, heat gained by ice will be sameQ=2400Lf…
Correct answer: 30g- A. Mud is a good conductor of heat
- B. Mud is a superconductor of heat
- C. Mud is a bad conductor of heat
- D. Heat is first given out and then taken out
Explanation: Option C is correct. Mud is a bad conductor of heat, meaning it does not transfer heat efficiently.
Correct answer: Mud is a bad conductor of heat- A. Heat is given out
- B. Heat is taken out
- C. No change in temperature
- D. Heat is first given out and then taken out
Explanation: Option C is correct.The heat capacity is the amount of heat required to raise the temperature of an object or substance by one degree.
Correct answer: No change in temperature- A. 0 K
- B. 273 K
- C. -273 K
- D. -273°C
Explanation: Internal energy is proportional to translational <K.E> that is proportional to T.
Correct answer: 273 K- A. Heat and surroundings
- B. Heat and other forms of energy
- C. Heat and liquids
- D. Heat and chemical energy
Explanation: Thermodynamics is a fundamental branch of physics that deals with the principles governing the energy transformations and the…
Correct answer: Heat and other forms of energy- A. Remains constant
- B. Increases by a factor of 4
- C. Is also doubled
- D. Is diminished by a factor of 1/4
Explanation: To determine how pressure changes, we use the ideal gas law: PV = nRT. Initially, the pressure is P = nRT/V.
Correct answer: Remains constant- A. 40 cm
- B. 30 cm
- C. 32 cm
- D. 24 cm
Explanation: This is the following solution: (remember the formula to solve questions with the same format)
Correct answer: 30 cm- A. 40cal/°C
- B. 160 cal/°C
- C. 200 cal/°C
- D. 8 cal°C^-1
Explanation: Option D is correct.We know thatThermal Capacity= mcThermal capacity = 40 g x 0.2cal/g/°C = 8 cal/°C
Correct answer: 8 cal°C^-1- A. The temperatures of water at 0°C and 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: The temperature of melting ice and boiling water at atmospheric pressure are 0°C and 100°C respectively.
Correct answer: The temperature of melting ice and boiling water at atmospheric pressure- A. 410⁰C
- B. 37⁰ C
- C. 42⁰C
- D. 55⁰C
Explanation: The formula to convert temperature from Fahrenheit (°F) to Celsius (°C) is:°C= 5/9 x (°F - 32)°C= 5/9 x (°98.6 - 32)°C=37°C
Correct answer: 37⁰ C