Thermodynamics
Q. In an isothermal process, the change in internal energy of an ideal gas is:
A.
Positive
B.
Negative
C.
Zero
D.
Depends on the amount of gas
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Solution
In an isothermal process for an ideal gas, the temperature remains constant, hence the change in internal energy is zero.
Correct Answer: C — Zero
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Q. In an isothermal process, the internal energy of an ideal gas:
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the amount of gas
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Solution
For an ideal gas, the internal energy is a function of temperature. In an isothermal process, the temperature remains constant, hence the internal energy remains constant.
Correct Answer: C — Remains constant
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Q. In an isothermal process, the temperature of the system remains constant. What is the work done by the gas?
A.
Zero
B.
nRT ln(Vf/Vi)
C.
nRT
D.
nR(Tf - Ti)
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Solution
In an isothermal process, the work done by the gas is given by W = nRT ln(Vf/Vi).
Correct Answer: B — nRT ln(Vf/Vi)
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Q. In an isothermal process, the temperature of the system:
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies linearly
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Solution
In an isothermal process, the temperature of the system remains constant.
Correct Answer: C — Remains constant
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Q. In heat exchangers, which process is primarily utilized?
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
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Solution
Heat exchangers primarily utilize conduction, convection, and radiation for heat transfer.
Correct Answer: D — All of the above
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Q. In heat transfer, what does the term 'thermal resistance' refer to?
A.
Resistance to heat flow
B.
Resistance to electrical flow
C.
Resistance to fluid flow
D.
None of the above
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Solution
Thermal resistance refers to the resistance to heat flow through a material.
Correct Answer: A — Resistance to heat flow
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Q. In which mode of heat transfer does the temperature difference drive the flow of heat?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the mode of heat transfer where the temperature difference causes the fluid to move, transferring heat.
Correct Answer: B — Convection
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Q. In which mode of heat transfer does the transfer of energy occur through electromagnetic waves?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Radiation is the mode of heat transfer that occurs through electromagnetic waves, such as infrared radiation.
Correct Answer: C — Radiation
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Q. In which of the following materials does heat transfer occur primarily through conduction?
A.
Metal
B.
Water
C.
Air
D.
Vacuum
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Solution
Heat transfer through conduction occurs primarily in solids, especially metals.
Correct Answer: A — Metal
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Q. In which of the following processes does heat transfer occur without any medium?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
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Solution
Radiation is the process of heat transfer that occurs without any medium.
Correct Answer: C — Radiation
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Q. In which of the following processes does the internal energy of a system remain constant?
A.
Isothermal process
B.
Adiabatic process
C.
Isobaric process
D.
Isochoric process
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Solution
In an isothermal process, the internal energy of an ideal gas remains constant.
Correct Answer: A — Isothermal process
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Q. In which of the following processes does the temperature of a gas increase?
A.
Isothermal expansion
B.
Adiabatic compression
C.
Isobaric expansion
D.
Isochoric cooling
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Solution
In adiabatic compression, the temperature of a gas increases due to work done on it.
Correct Answer: B — Adiabatic compression
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Q. In which of the following processes does the temperature of a substance remain constant?
A.
Heating
B.
Cooling
C.
Phase change
D.
Compression
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Solution
During a phase change, the temperature of a substance remains constant despite heat being added or removed.
Correct Answer: C — Phase change
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Q. In which of the following processes does the temperature of the system remain constant?
A.
Isothermal process
B.
Adiabatic process
C.
Isobaric process
D.
Isochoric process
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Solution
In an isothermal process, the temperature of the system remains constant.
Correct Answer: A — Isothermal process
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Q. In which of the following scenarios does conduction occur?
A.
Heating water in a pot
B.
Sun warming the Earth
C.
Wind blowing
D.
Ice melting in a drink
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Solution
Conduction occurs when heat is transferred through direct contact, such as heating water in a pot.
Correct Answer: A — Heating water in a pot
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Q. In which process does a gas do work on its surroundings?
A.
Isothermal expansion
B.
Adiabatic compression
C.
Isochoric process
D.
Isobaric process
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Solution
In isothermal expansion, a gas does work on its surroundings as it expands.
Correct Answer: A — Isothermal expansion
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Q. In which process does heat transfer occur due to the movement of fluid?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the process of heat transfer that occurs due to the movement of fluid, where warmer areas of a liquid or gas rise and cooler areas sink.
Correct Answer: B — Convection
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Q. In which process does heat transfer occur without any physical movement of the material?
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
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Solution
Conduction is the process where heat is transferred through a material without any movement of the material itself.
Correct Answer: A — Conduction
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Q. In which scenario does heat transfer occur through both conduction and convection?
A.
A hot cup of coffee cooling down
B.
A metal rod heated at one end
C.
A warm room losing heat to the outside
D.
A block of ice melting
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Solution
A hot cup of coffee cooling down involves conduction (heat transfer from coffee to cup) and convection (heat transfer from cup to air).
Correct Answer: A — A hot cup of coffee cooling down
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Q. The heat transfer coefficient in convection depends on which of the following?
A.
Surface area
B.
Fluid velocity
C.
Temperature difference
D.
All of the above
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Solution
The heat transfer coefficient in convection depends on surface area, fluid velocity, and temperature difference.
Correct Answer: D — All of the above
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Q. The rate of heat transfer by conduction is directly proportional to the area and the temperature gradient. This is described by which law?
A.
Newton's Law of Cooling
B.
Fourier's Law of Heat Conduction
C.
Stefan-Boltzmann Law
D.
Ohm's Law
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Solution
Fourier's Law of Heat Conduction states that the rate of heat transfer by conduction is directly proportional to the area and the temperature gradient.
Correct Answer: B — Fourier's Law of Heat Conduction
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Q. The rate of heat transfer by conduction is directly proportional to which of the following?
A.
Temperature difference
B.
Surface area
C.
Material thickness
D.
All of the above
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Solution
The rate of heat transfer by conduction is directly proportional to the temperature difference between the two ends.
Correct Answer: A — Temperature difference
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Q. The Stefan-Boltzmann Law relates to which mode of heat transfer?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
The Stefan-Boltzmann Law relates to radiation, stating that the total energy radiated per unit surface area is proportional to the fourth power of the black body's temperature.
Correct Answer: C — Radiation
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Q. What does the first law of thermodynamics state?
A.
Energy can be created and destroyed.
B.
The total energy of an isolated system is constant.
C.
Heat cannot be converted into work.
D.
The internal energy of a system is independent of its state.
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Solution
The first law of thermodynamics states that the total energy of an isolated system is constant, meaning energy can neither be created nor destroyed.
Correct Answer: B — The total energy of an isolated system is constant.
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Q. What happens to the entropy of a system when it undergoes a reversible isothermal expansion?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the gas
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Solution
During a reversible isothermal expansion, the entropy of the system increases as the gas expands and does work on the surroundings.
Correct Answer: A — Increases
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Q. What happens to the entropy of a system when it undergoes a reversible process?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It can either increase or decrease
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Solution
In a reversible process, the total entropy of the system and surroundings remains constant.
Correct Answer: B — It remains constant
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Q. What happens to the entropy of a system when it undergoes a spontaneous process?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
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Solution
In a spontaneous process, the entropy of a system increases.
Correct Answer: C — It increases
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Q. What happens to the entropy of an isolated system?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It can either increase or decrease
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Solution
The second law of thermodynamics states that the entropy of an isolated system always increases.
Correct Answer: C — It increases
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Q. What happens to the internal energy of a gas when it is allowed to expand freely into a vacuum?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the initial temperature
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Solution
In free expansion, no work is done and no heat is exchanged, so the internal energy remains constant.
Correct Answer: C — Remains constant
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Q. What happens to the internal energy of an ideal gas during an isochoric process?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It can either increase or decrease
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Solution
In an isochoric process, the volume remains constant, and any heat added to the system increases the internal energy of the gas.
Correct Answer: A — It increases
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