Q. If a metal rod is heated at one end, what happens to the temperature of the other end over time?
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A.
It remains constant
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B.
It decreases
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C.
It increases
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D.
It fluctuates
Solution
The temperature of the other end of the rod will increase over time due to conduction as heat is transferred along the rod.
Correct Answer:
C
— It increases
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Q. If the temperature of a gas increases, what happens to its volume at constant pressure?
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A.
It decreases
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B.
It remains the same
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C.
It increases
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D.
It becomes zero
Solution
According to Charles's Law, if the temperature of a gas increases at constant pressure, its volume increases.
Correct Answer:
C
— It increases
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Q. If the temperature of a gas increases, what happens to its volume if the pressure remains constant?
-
A.
It decreases
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B.
It remains the same
-
C.
It increases
-
D.
It becomes zero
Solution
According to Charles's Law, if the pressure is constant, the volume of a gas increases as its temperature increases.
Correct Answer:
C
— It increases
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Q. In a heat engine, what is the purpose of the heat reservoir?
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A.
To absorb heat
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B.
To release heat
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C.
To convert heat to work
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D.
To increase efficiency
Solution
The heat reservoir serves as a source of thermal energy that the heat engine absorbs heat from to perform work.
Correct Answer:
A
— To absorb heat
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Q. In a heat engine, what is the purpose of the heat sink?
-
A.
To absorb heat from the engine
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B.
To release heat to the environment
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C.
To increase efficiency
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D.
To store energy
Solution
The heat sink in a heat engine is used to release excess heat to the environment, allowing the engine to operate efficiently.
Correct Answer:
B
— To release heat to the environment
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Q. What happens to the entropy of a system when heat is added at a constant temperature?
-
A.
It decreases
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B.
It remains the same
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C.
It increases
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D.
It becomes zero
Solution
When heat is added to a system at constant temperature, the entropy of the system increases, as entropy is a measure of disorder.
Correct Answer:
C
— It increases
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Q. What happens to the volume of a gas when it is heated at constant pressure?
-
A.
It decreases
-
B.
It remains the same
-
C.
It increases
-
D.
It fluctuates
Solution
According to Charles's Law, the volume of a gas increases when it is heated at constant pressure.
Correct Answer:
C
— It increases
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Q. What is entropy a measure of?
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A.
Energy
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B.
Disorder
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C.
Temperature
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D.
Pressure
Solution
Entropy is a measure of disorder or randomness in a system, indicating the number of ways a system can be arranged.
Correct Answer:
B
— Disorder
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Q. What is the formula for calculating the heat transfer by conduction?
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A.
Q = mcΔT
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B.
Q = kA(T1-T2)/d
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C.
Q = mL
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D.
Q = hA(Ts - Tf)
Solution
The formula for heat transfer by conduction is Q = kA(T1-T2)/d, where k is the thermal conductivity, A is the area, and d is the thickness.
Correct Answer:
B
— Q = kA(T1-T2)/d
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Q. What is the main mechanism of heat transfer in a vacuum?
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A.
Conduction
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B.
Convection
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C.
Radiation
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D.
None
Solution
In a vacuum, heat transfer occurs primarily through radiation, as there are no particles to conduct or convect heat.
Correct Answer:
C
— Radiation
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Q. What is the primary mode of heat transfer in solids?
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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
In solids, heat is primarily transferred through conduction, where thermal energy is passed through collisions between particles.
Correct Answer:
A
— Conduction
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Q. What is the term for the expansion of materials when heated?
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A.
Thermal contraction
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B.
Thermal expansion
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C.
Thermal equilibrium
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D.
Thermal conductivity
Solution
Thermal expansion refers to the increase in volume of materials when they are heated.
Correct Answer:
B
— Thermal expansion
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Q. Which process describes the transfer of heat through a fluid due to density differences?
-
A.
Conduction
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B.
Convection
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C.
Radiation
-
D.
Insulation
Solution
Convection describes the transfer of heat through a fluid (liquid or gas) due to density differences caused by temperature variations.
Correct Answer:
B
— Convection
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Q. Which process describes the transfer of heat through a fluid due to the movement of the fluid itself?
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A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Diffusion
Solution
Convection is the process of heat transfer through the movement of fluids, where warmer fluid rises and cooler fluid sinks.
Correct Answer:
B
— Convection
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Showing 1 to 14 of 14 (1 Pages)
