Heat & Temperature
Q. Which law states that the total energy of an isolated system remains constant?
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A.
First law of thermodynamics
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B.
Second law of thermodynamics
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C.
Zeroth law of thermodynamics
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D.
Third law of thermodynamics
Solution
The first law of thermodynamics states that the total energy of an isolated system remains constant.
Correct Answer: A — First law of thermodynamics
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Q. Which of the following is a good conductor of heat?
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A.
Wood
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B.
Plastic
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C.
Copper
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D.
Glass
Solution
Copper is a good conductor of heat.
Correct Answer: C — Copper
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Q. Which of the following is a measure of the average kinetic energy of particles in a substance?
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A.
Heat
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B.
Temperature
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C.
Thermal energy
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D.
Latent heat
Solution
Temperature is a measure of the average kinetic energy of particles in a substance.
Correct Answer: B — Temperature
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Q. Which of the following is a method of heat transfer?
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A.
Conduction
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B.
Convection
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C.
Radiation
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D.
All of the above
Solution
Conduction, convection, and radiation are all methods of heat transfer.
Correct Answer: D — All of the above
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Q. Which of the following processes involves a change in temperature?
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A.
Isothermal process
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B.
Adiabatic process
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C.
Isobaric process
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D.
Isochoric process
Solution
In an adiabatic process, the system does not exchange heat with its surroundings, leading to a change in temperature.
Correct Answer: B — Adiabatic process
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Q. Which of the following processes is an example of an isothermal process?
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A.
Heating a gas in a closed container
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B.
Compressing a gas without heat exchange
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C.
Melting ice at 0°C
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D.
Cooling a gas at constant pressure
Solution
Melting ice at 0°C is an isothermal process as the temperature remains constant during the phase change.
Correct Answer: C — Melting ice at 0°C
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Q. Which of the following statements is true about thermal equilibrium?
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A.
Heat flows from cold to hot
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B.
Heat flows from hot to cold
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C.
No heat flow occurs
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D.
Temperature is irrelevant
Solution
In thermal equilibrium, no heat flows between systems, meaning they are at the same temperature.
Correct Answer: C — No heat flow occurs
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Q. Which process involves a change in temperature due to heat transfer?
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A.
Isothermal process
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B.
Adiabatic process
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C.
Isobaric process
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D.
Isochoric process
Solution
An isobaric process occurs at constant pressure and can involve a change in temperature due to heat transfer.
Correct Answer: C — Isobaric process
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Q. Which process involves a change in temperature without a change in heat content?
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A.
Isothermal process
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B.
Adiabatic process
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C.
Isochoric process
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D.
Isobaric process
Solution
In an adiabatic process, there is no heat exchange with the surroundings, leading to a change in temperature.
Correct Answer: B — Adiabatic process
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Q. Which process involves a change in temperature without a change in phase?
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A.
Melting
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B.
Boiling
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C.
Heating
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D.
Condensation
Solution
Heating involves a change in temperature without a change in phase.
Correct Answer: C — Heating
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Q. Which process involves the transfer of heat through the movement of fluids?
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A.
Conduction
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B.
Convection
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C.
Radiation
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D.
Insulation
Solution
Convection is the process of heat transfer through the movement of fluids.
Correct Answer: B — Convection
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