Thermodynamics
Q. What is the primary method of heat transfer from the Sun to the Earth?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
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Solution
The primary method of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer from the Sun to the Earth?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
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Solution
The primary mode of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer in a vacuum?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
In a vacuum, there are no particles to conduct or convect heat, so radiation is the only mode of heat transfer.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer in liquids and gases?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
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Solution
Convection is the primary mode of heat transfer in liquids and gases due to the movement of the fluid.
Correct Answer: B — Convection
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Q. What is the primary reason for using insulation in buildings?
A.
To prevent conduction
B.
To enhance convection
C.
To increase radiation
D.
To allow heat flow
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Solution
Insulation is used primarily to prevent conduction of heat, thereby maintaining the desired temperature inside buildings.
Correct Answer: A — To prevent conduction
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Q. What is the principle behind a thermometer?
A.
Expansion of liquid with temperature
B.
Contraction of gas with temperature
C.
Change in color with temperature
D.
Change in pressure with temperature
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Solution
Thermometers work on the principle of expansion of liquid (like mercury) with temperature.
Correct Answer: A — Expansion of liquid with temperature
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Q. What is the relationship between enthalpy (H), internal energy (U), pressure (P), and volume (V)?
A.
H = U + PV
B.
H = U - PV
C.
H = U + P/V
D.
H = U - P/V
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Solution
The relationship is given by H = U + PV, where H is enthalpy, U is internal energy, P is pressure, and V is volume.
Correct Answer: A — H = U + PV
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Q. What is the relationship between heat capacity at constant pressure (Cp) and heat capacity at constant volume (Cv)?
A.
Cp = Cv
B.
Cp > Cv
C.
Cp < Cv
D.
Cp = Cv + R
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Solution
For an ideal gas, Cp is always greater than Cv because it includes the work done against the atmospheric pressure.
Correct Answer: B — Cp > Cv
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Q. What is the relationship between heat capacity at constant volume (Cv) and heat capacity at constant pressure (Cp) for an ideal gas?
A.
Cp = Cv
B.
Cp = Cv + R
C.
Cp = Cv - R
D.
Cp = 2Cv
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Solution
For an ideal gas, the relationship is given by Cp = Cv + R, where R is the universal gas constant.
Correct Answer: B — Cp = Cv + R
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Q. What is the relationship between heat capacity at constant volume (Cv) and heat capacity at constant pressure (Cp)?
A.
Cp = Cv
B.
Cp = Cv + R
C.
Cp = Cv - R
D.
Cp = 2Cv
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Solution
The relationship is Cp = Cv + R for an ideal gas, where R is the gas constant.
Correct Answer: B — Cp = Cv + R
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Q. What is the relationship between temperature and kinetic energy of particles in a substance?
A.
Directly proportional
B.
Inversely proportional
C.
No relationship
D.
Depends on the substance
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Solution
The average kinetic energy of particles in a substance is directly proportional to its temperature.
Correct Answer: A — Directly proportional
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Q. What is the relationship between temperature and kinetic energy of particles?
A.
Directly proportional
B.
Inversely proportional
C.
No relation
D.
Exponential relation
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Solution
The temperature of a substance is directly proportional to the average kinetic energy of its particles.
Correct Answer: A — Directly proportional
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Q. What is the SI unit of temperature?
A.
Celsius
B.
Fahrenheit
C.
Kelvin
D.
Rankine
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Solution
The SI unit of temperature is Kelvin.
Correct Answer: C — Kelvin
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Q. What is the SI unit of thermal conductivity?
A.
W/m·K
B.
J/kg·K
C.
K/W
D.
J/m·s
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Solution
The SI unit of thermal conductivity is Watts per meter per Kelvin (W/m·K).
Correct Answer: A — W/m·K
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Q. What is the significance of the First Law of Thermodynamics?
A.
It defines the concept of temperature
B.
It establishes the conservation of energy principle
C.
It describes the behavior of gases
D.
It relates pressure and volume
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Solution
The First Law of Thermodynamics establishes the conservation of energy principle, stating that energy cannot be created or destroyed.
Correct Answer: B — It establishes the conservation of energy principle
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Q. What is the specific heat capacity at constant volume (Cv) for a monatomic ideal gas?
A.
3/2 R
B.
5/2 R
C.
R
D.
2 R
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Solution
The specific heat capacity at constant volume for a monatomic ideal gas is Cv = 3/2 R.
Correct Answer: A — 3/2 R
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Q. What is the specific heat capacity of a substance?
A.
The amount of heat required to change its temperature by 1 degree Celsius
B.
The amount of heat required to change its state
C.
The heat required to raise the temperature of a unit mass by 1 degree Celsius
D.
The heat required to cool a substance
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Solution
The specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of a unit mass by 1 degree Celsius.
Correct Answer: C — The heat required to raise the temperature of a unit mass by 1 degree Celsius
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Q. What is the specific heat capacity of water if 500 J of heat is required to raise the temperature of 100 g of water by 5°C?
A.
1 J/g°C
B.
2 J/g°C
C.
4 J/g°C
D.
5 J/g°C
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Solution
Specific heat capacity (c) = Q / (m * ΔT) = 500 J / (100 g * 5°C) = 1 J/g°C.
Correct Answer: A — 1 J/g°C
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Q. What is the specific heat capacity of water?
A.
1 J/g°C
B.
4.18 J/g°C
C.
2 J/g°C
D.
0.5 J/g°C
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Solution
The specific heat capacity of water is approximately 4.18 J/g°C.
Correct Answer: B — 4.18 J/g°C
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Q. What is the Stefan-Boltzmann law related to?
A.
Conduction
B.
Convection
C.
Radiation
D.
Thermal expansion
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Solution
The Stefan-Boltzmann law states that the total energy radiated per unit surface area of a black body is proportional to the fourth power of its absolute temperature.
Correct Answer: C — Radiation
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Q. What is the term for the amount of heat required to raise the temperature of 1 kg of a substance by 1 degree Celsius?
A.
Heat capacity
B.
Specific heat capacity
C.
Latent heat
D.
Thermal conductivity
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Solution
Specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kg of a substance by 1 degree Celsius.
Correct Answer: B — Specific heat capacity
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Q. What is the term for the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius?
A.
Heat capacity
B.
Specific heat
C.
Latent heat
D.
Thermal conductivity
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Solution
Specific heat is defined as the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius.
Correct Answer: B — Specific heat
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Q. What is the term for the heat transfer that occurs due to the movement of a fluid?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the term used for heat transfer that occurs due to the movement of a fluid.
Correct Answer: B — Convection
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Q. What is the term for the transfer of heat through electromagnetic waves?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
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Solution
Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation.
Correct Answer: C — Radiation
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Q. What is the unit of heat in the SI system?
A.
Joule
B.
Calorie
C.
Watt
D.
Newton
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Solution
The SI unit of heat is the Joule.
Correct Answer: A — Joule
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Q. What is the unit of thermal conductivity?
A.
W/m·K
B.
J/kg·K
C.
K/W
D.
J/m·s
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Solution
The unit of thermal conductivity is Watts per meter per Kelvin (W/m·K).
Correct Answer: A — W/m·K
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Q. What is the value of the universal gas constant R in J/(mol·K)?
A.
8.314
B.
0.0821
C.
1.987
D.
22.414
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Solution
The universal gas constant R is 8.314 J/(mol·K).
Correct Answer: A — 8.314
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Q. What is the work done by a gas during an isobaric expansion?
A.
Zero
B.
PΔV
C.
ΔU
D.
Q
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Solution
In an isobaric process, the work done by the gas is given by W = PΔV, where P is the pressure and ΔV is the change in volume.
Correct Answer: B — PΔV
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Q. What is the work done by a gas during expansion against a constant external pressure?
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Solution
The work done by a gas during expansion against a constant external pressure is given by W = PΔV, where P is the pressure and ΔV is the change in volume.
Correct Answer: A — PΔV
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Q. What is the work done by a gas during expansion at constant pressure?
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Solution
The work done by a gas during expansion at constant pressure is given by W = PΔV.
Correct Answer: A — PΔV
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