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WorksheetsPhysics Quiz
Total questions: 13
Worksheet time: 7mins
What is the term for the ability of a thermodynamic system to exchange energy with its surroundings?
Thermal equilibrium
Thermodynamic process
Mechanical equilibrium
Chemical equilibrium
What happens to the system when T_S = T_E?
The system gains energy
The system loses energy
No net transfer of energy occurs
The system becomes unstable
When is a system said to be in mechanical equilibrium?
When there are no unbalanced forces within the system and surroundings
When the temperature is uniform throughout the system
When there are no chemical reactions going on within the system
When the pressure is different throughout the system
What is an isobaric process?
A process at constant pressure.
A process at constant volume.
A process at constant temperature.
A process at constant entropy.
What is the primary use of heat in an isochoric process?
To increase the internal energy of the system.
To do work on the surroundings.
To change the volume of the system.
To change the pressure of the system.
What is the equation for the change in internal energy in an adiabatic process?
ΔU = Cv (ΔT)
ΔU = Cp (ΔT)
ΔU = R (ΔT)
ΔU = T (ΔT)
What is the role of the hot reservoir in a heat engine?
It absorbs heat from the working substance at a lower temperature.
It absorbs heat from the working substance at a higher temperature.
It converts heat into work.
It rejects heat to the cold reservoir.
What is the fundamental limit on the efficiency of a heat engine set by?
The first law of thermodynamics
The second law of thermodynamics
The third law of thermodynamics
The zeroth law of thermodynamics
What is the equation for the thermal efficiency of a heat engine using QH and QC?
η = 1 - QC / QH
η = 1 + QC / QH
η = QH / QC
η = QC / QH
What is the main difference between refrigerators and heat pumps compared to heat engines?
They work in the same direction as heat engines.
They convert heat into mechanical work.
They work in the backward direction, converting mechanical work into heat.
They do not involve any phase change of the refrigerant.
For maximum efficiency in a Carnot engine, the source temperature T_H should be:
As low as possible
Equal to the sink temperature T_C
As high as possible
Independent of the sink temperature
Efficiency of a Carnot cycle is 75%. If temperature of the hot reservoir is 727°C, calculate the temperature of cold reservoir.
250 K
300 K
350 K
400 K
What is the work done per cycle in a hypothetical thermodynamic cycle shown in the figure?
Area of the circle
Volume of the circle
Radius of the circle
Diameter of the circle
