Thermodynamics
Q. Which of the following is an example of conduction?
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A.
Boiling water
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B.
Heating a metal rod
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C.
Sun warming the Earth
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D.
Wind blowing
Solution
Heating a metal rod is an example of conduction, where heat is transferred through direct contact between particles.
Correct Answer: B — Heating a metal rod
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Q. Which of the following is an example of convection?
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A.
Heating a metal rod in a flame
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B.
Boiling water in a pot
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C.
Sunlight warming the ground
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D.
Ice melting in a drink
Solution
Boiling water in a pot is a classic example of convection, where hot water rises and cooler water descends.
Correct Answer: B — Boiling water in a pot
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Q. Which of the following is an example of forced convection?
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A.
Heat transfer in a pot of boiling water
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B.
Heat transfer from a radiator
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C.
Heat transfer from a hot cup of coffee
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D.
Heat transfer in a still air room
Solution
Heat transfer in a pot of boiling water is an example of forced convection.
Correct Answer: B — Heat transfer from a radiator
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Q. Which of the following is an example of heat transfer by radiation?
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A.
Heating a metal rod in a flame
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B.
Sunlight warming the Earth
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C.
Boiling water in a pot
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D.
Heating air in a room
Solution
Sunlight warming the Earth is an example of heat transfer by radiation, as it does not require a medium.
Correct Answer: B — Sunlight warming the Earth
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Q. Which of the following is the best conductor of heat?
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A.
Air
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B.
Water
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C.
Copper
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D.
Wood
Solution
Copper is known to be one of the best conductors of heat among the given options.
Correct Answer: C — Copper
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Q. Which of the following materials has the highest thermal resistance?
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A.
Copper
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B.
Aluminum
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C.
Glass Wool
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D.
Steel
Solution
Glass Wool has the highest thermal resistance among the given materials, making it a good insulator.
Correct Answer: C — Glass Wool
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Q. Which of the following materials is the best conductor of heat?
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A.
Wood
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B.
Air
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C.
Copper
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D.
Glass
Solution
Copper is known for its excellent thermal conductivity, making it the best conductor among the given options.
Correct Answer: C — Copper
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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 adiabatic?
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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.
Cooling a gas at constant pressure
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D.
Evaporating water at room temperature
Solution
An adiabatic process is one in which no heat is exchanged with the surroundings, such as compressing a gas without heat exchange.
Correct Answer: B — Compressing a gas without heat exchange
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Q. Which of the following processes is an example of an adiabatic process?
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A.
Heating water in a kettle
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B.
Compressing a gas in a piston without heat exchange
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C.
Melting ice at room temperature
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D.
Boiling water
Solution
An adiabatic process is one in which no heat is exchanged with the surroundings, such as compressing a gas in a piston without heat exchange.
Correct Answer: B — Compressing a gas in a piston without heat exchange
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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 processes is not a thermodynamic process?
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A.
Isothermal
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B.
Adiabatic
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C.
Isochoric
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D.
Static
Solution
A static process does not involve any change in state variables, hence it is not considered a thermodynamic process.
Correct Answer: D — Static
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Q. Which of the following processes is not governed by the First Law of Thermodynamics?
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A.
Isothermal expansion
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B.
Adiabatic compression
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C.
Isochoric heating
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D.
None of the above
Solution
All the listed processes are governed by the First Law of Thermodynamics, so the answer is 'None of the above'.
Correct Answer: D — None of the above
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Q. Which of the following statements is true about an ideal gas?
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A.
It has no intermolecular forces
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B.
It behaves according to the ideal gas law at all temperatures
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C.
It can be liquefied at any temperature
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D.
Its specific heat is constant
Solution
An ideal gas is defined as a gas that has no intermolecular forces and follows the ideal gas law under all conditions.
Correct Answer: A — It has no intermolecular forces
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Q. Which of the following statements is true about entropy?
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A.
Entropy is a measure of disorder
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B.
Entropy decreases in irreversible processes
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C.
Entropy is constant in reversible processes
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D.
Both a and c are true
Solution
Entropy is a measure of disorder, and it is constant in reversible processes, making both statements a and c true.
Correct Answer: D — Both a and c are true
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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 of the following statements is true for an ideal gas?
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A.
The internal energy depends on temperature only
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B.
The internal energy depends on volume and pressure
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C.
The internal energy is constant at all temperatures
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D.
The internal energy is independent of temperature
Solution
For an ideal gas, the internal energy depends only on temperature, not on volume or pressure.
Correct Answer: A — The internal energy depends on temperature only
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Q. Which of the following statements is true regarding the first law of thermodynamics?
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A.
It applies only to closed systems.
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B.
It is a statement of conservation of energy.
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C.
It can be violated under certain conditions.
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D.
It only applies to mechanical systems.
Solution
The first law of thermodynamics is a statement of conservation of energy, applicable to all thermodynamic systems.
Correct Answer: B — It is a statement of conservation of energy.
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Q. Which of the following statements is true regarding the second law of thermodynamics?
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A.
It allows for the conversion of heat into work with 100% efficiency
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B.
It states that energy can be created from nothing
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C.
It introduces the concept of entropy
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D.
It applies only to mechanical systems
Solution
The second law of thermodynamics introduces the concept of entropy, stating that the total entropy of an isolated system can never decrease over time.
Correct Answer: C — It introduces the concept of entropy
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Q. Which of the following surfaces is the best emitter of radiation?
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A.
Shiny surface
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B.
Dull black surface
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C.
White surface
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D.
Transparent surface
Solution
A dull black surface is the best emitter of radiation according to Kirchhoff's law of thermal radiation.
Correct Answer: B — Dull black surface
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Q. Which of the following surfaces is the best emitter of thermal radiation?
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A.
Shiny metal
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B.
White paint
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C.
Black paint
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D.
Glass
Solution
A black surface is the best emitter of thermal radiation due to its high emissivity.
Correct Answer: C — Black paint
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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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