Physics
Grade-9
Easy
Question
______ separates the system from the surroundings.
- Boundary
- Membrane
- Skin
- None of the above
Hint:
The system boundary is a rectangle that you can draw in a use-case diagram to separate the use cases that are internal to a system from the actors that are external to the system.
The correct answer is: Boundary
The boundary is the closed three-dimensional surface that encloses the system and separates it from the surroundings.
Related Questions to study
Physics
Which of the following is an extensive property of a system?
- Temperature
- Pressure
- Number of moles
- Density
Which of the following is an extensive property of a system?
PhysicsGrade-9
- Temperature
- Pressure
- Number of moles
- Density
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What are the particles of the system (red-hot iron rod) shown below?

- Iron molecules
- Iron atoms
- Copper atoms
- Brass atoms
What are the particles of the system (red-hot iron rod) shown below?

PhysicsGrade-9
- Iron molecules
- Iron atoms
- Copper atoms
- Brass atoms
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Which of the following cannot be a heat reservoir?
- Air
- Stove top
- Sea
- Earth
Which of the following cannot be a heat reservoir?
PhysicsGrade-9
- Air
- Stove top
- Sea
- Earth
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During a thermodynamic process, 30 joules of heat are added to a gas while 25 joules of work are done by the gas. The change in internal energy of a system is ____ J.
During a thermodynamic process, 30 joules of heat are added to a gas while 25 joules of work are done by the gas. The change in internal energy of a system is ____ J.
PhysicsGrade-9
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During an isothermal process 125 J of heat are removed from a trapped gas. Find out the change in internal energy of the system.
During an isothermal process 125 J of heat are removed from a trapped gas. Find out the change in internal energy of the system.
PhysicsGrade-9
Physics
In an isothermal process the change in internal energy of the system is ____.
In an isothermal process the change in internal energy of the system is ____.
PhysicsGrade-9
Physics
During a thermodynamic process, 438 J of heat is removed from a gas system while 238 J of work is done on the gas. The change in internal energy of a system is _____ J.
- 200
- - 200
- - 676
- 676
During a thermodynamic process, 438 J of heat is removed from a gas system while 238 J of work is done on the gas. The change in internal energy of a system is _____ J.
PhysicsGrade-9
- 200
- - 200
- - 676
- 676
Physics
A cold reservoir is touched to a system, which of the following may happen?
- The heat flows from the system to the reservoir
- The internal energy of the system decreases
- The temperature of the system decreases
- All of the above
A cold reservoir is touched to a system, which of the following may happen?
PhysicsGrade-9
- The heat flows from the system to the reservoir
- The internal energy of the system decreases
- The temperature of the system decreases
- All of the above
Physics
When there is no heat exchange between the system and the reservoir, ____.
- The system is said to have enough heat
- The reservoir is said to have enough heat
- The system and the reservoir are said to be in thermal equilibrium
- The system is not connected to the reservoir
When there is no heat exchange between the system and the reservoir, ____.
PhysicsGrade-9
- The system is said to have enough heat
- The reservoir is said to have enough heat
- The system and the reservoir are said to be in thermal equilibrium
- The system is not connected to the reservoir
Physics
The internal energy of a system does not change in a/an _____ process.
(A) Isothermal
(B) Adiabatic
(C) Isochoric
(D) Isobaric
- A and C
- A and B
- B and D
- All of them
The internal energy of a system does not change in a/an _____ process.
(A) Isothermal
(B) Adiabatic
(C) Isochoric
(D) Isobaric
PhysicsGrade-9
- A and C
- A and B
- B and D
- All of them
Physics
Energy can be added to a system by ____.
- Work
- Heat
- Both a and b
- None
Energy can be added to a system by ____.
PhysicsGrade-9
- Work
- Heat
- Both a and b
- None
Physics
Internal energy denotes ______.
- Kinetic energy
- Potential energy
- Electrostatic energy
- Sum of all of the above
Internal energy denotes ______.
PhysicsGrade-9
- Kinetic energy
- Potential energy
- Electrostatic energy
- Sum of all of the above
Physics
When the pressure inside the system is smaller than the pressure outside it, the work is done ______.
- By the system
- On the system
- On the surrounding
- All of the above
When the pressure inside the system is smaller than the pressure outside it, the work is done ______.
PhysicsGrade-9
- By the system
- On the system
- On the surrounding
- All of the above
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During a thermodynamic process, 540 J of heat is removed from a gas system while 1200 J of work done on the gas. The change in internal energy of a system is _______J.
During a thermodynamic process, 540 J of heat is removed from a gas system while 1200 J of work done on the gas. The change in internal energy of a system is _______J.
PhysicsGrade-9
Physics
During a thermodynamic process, 230 joules of heat are added to a gas while 200 joules of work are done by the gas. The change in internal energy of a system is ______ J.
During a thermodynamic process, 230 joules of heat are added to a gas while 200 joules of work are done by the gas. The change in internal energy of a system is ______ J.
PhysicsGrade-9