Thermodynamics
Q. What is the work done by a gas during isothermal expansion?
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A.
Zero
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B.
Depends on the temperature
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C.
Is equal to the heat absorbed
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D.
Is equal to the change in internal energy
Solution
During isothermal expansion, the work done by the gas is equal to the heat absorbed, as the internal energy remains constant.
Correct Answer: C — Is equal to the heat absorbed
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Q. What is the work done by an ideal gas during an isobaric process?
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A.
PΔV
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B.
nRT
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C.
0
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D.
nRΔT
Solution
The work done by an ideal gas during an isobaric process is given by W = PΔV.
Correct Answer: A — PΔV
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Q. What is the work done by an ideal gas during an isothermal expansion?
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A.
Zero
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B.
nRT ln(Vf/Vi)
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C.
nRT (Vf - Vi)
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D.
nR (Tf - Ti)
Solution
The work done by an ideal gas during an isothermal expansion is given by W = nRT ln(Vf/Vi).
Correct Answer: B — nRT ln(Vf/Vi)
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Q. What is the work done by the system during an isochoric process?
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A.
Positive
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B.
Negative
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C.
Zero
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D.
Depends on the temperature
Solution
In an isochoric process, the volume remains constant, so no work is done by the system (W = PΔV = 0).
Correct Answer: C — Zero
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Q. What is the work done by the system in an isochoric process?
-
A.
Positive
-
B.
Negative
-
C.
Zero
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D.
Depends on the temperature
Solution
In an isochoric process, the volume remains constant, so no work is done by the system (W = PΔV = 0).
Correct Answer: C — Zero
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Q. What is the work done by the system when it expands against a constant external pressure?
Solution
The work done by the system during expansion against a constant external pressure is given by W = PΔV.
Correct Answer: A — PΔV
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Q. What is the work done on a gas during an isochoric process?
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A.
Positive
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B.
Negative
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C.
Zero
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D.
Depends on the gas
Solution
In an isochoric process, the volume remains constant, which means no work is done on or by the gas. Therefore, the work done is zero.
Correct Answer: C — Zero
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Q. Which law states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero?
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A.
Zeroth law of thermodynamics
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B.
First law of thermodynamics
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C.
Second law of thermodynamics
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D.
Third law of thermodynamics
Solution
The Third law of thermodynamics states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero.
Correct Answer: D — Third law of thermodynamics
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Q. Which law states that the rate of heat transfer through a material is proportional to the temperature gradient?
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A.
Newton's Law of Cooling
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B.
Fourier's Law of Heat Conduction
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C.
Stefan-Boltzmann Law
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D.
Kirchhoff's Law
Solution
Fourier's Law of Heat Conduction states that the rate of heat transfer through a material is proportional to the temperature gradient.
Correct Answer: B — Fourier's Law of Heat Conduction
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Q. Which law states that the rate of heat transfer through a material is proportional to the negative gradient of temperature?
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A.
Newton's Law of Cooling
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B.
Fourier's Law of Heat Conduction
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C.
Stefan-Boltzmann Law
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D.
Kirchhoff's Law
Solution
Fourier's Law of Heat Conduction states that the rate of heat transfer through a material is proportional to the negative gradient of temperature.
Correct Answer: B — Fourier's Law of Heat Conduction
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Q. Which law states that the rate of heat transfer through a material is proportional to the temperature difference across it?
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A.
Newton's Law of Cooling
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B.
Fourier's Law
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C.
Stefan-Boltzmann Law
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D.
Ohm's Law
Solution
Fourier's Law states that the rate of heat transfer through a material is proportional to the temperature difference across it.
Correct Answer: B — Fourier's Law
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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 factors does NOT affect the rate of heat transfer by conduction?
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A.
Temperature difference
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B.
Material thickness
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C.
Surface area
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D.
Color of the material
Solution
The color of the material does not affect the rate of heat transfer by conduction; the other factors do.
Correct Answer: D — Color of the material
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Q. Which of the following factors does NOT affect the rate of heat transfer by convection?
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A.
Fluid velocity
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B.
Surface area
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C.
Temperature difference
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D.
Material density
Solution
Material density does not directly affect the rate of heat transfer by convection.
Correct Answer: D — Material density
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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 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.
Cooling a gas in a refrigerator
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D.
Heating a metal rod in a flame
Solution
An adiabatic process is one in which no heat is exchanged with the surroundings. Compressing a gas in a piston without heat exchange is an example.
Correct Answer: B — Compressing a gas in a piston without heat exchange
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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
-
B.
Air
-
C.
Copper
-
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 isothermal for an ideal gas?
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A.
Heating at constant volume
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B.
Cooling at constant pressure
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C.
Expansion against a constant external pressure
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D.
Expansion where temperature remains constant
Solution
An isothermal process for an ideal gas is characterized by the condition that the temperature remains constant during the expansion or compression.
Correct Answer: D — Expansion where temperature remains constant
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