First Law of Thermodynamics
Physics ⇒ Heat and Thermodynamics
First Law of Thermodynamics starts at 10 and continues till grade 12.
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Describe what happens to the internal energy of a system if no heat is added but the system does work on the surroundings.
Describe what happens to the internal energy of a system in an adiabatic expansion.
Explain the difference between heat and work in the context of the First Law of Thermodynamics.
Explain the meaning of each term in the equation ΔU = Q - W.
A gas is compressed by a piston, and 100 J of work is done on the gas. If the internal energy increases by 80 J, how much heat is lost or gained by the gas?
A gas is compressed isothermally and 150 J of work is done on it. What is the amount of heat exchanged?
A system does 40 J of work and its internal energy decreases by 10 J. How much heat was exchanged?
A system releases 80 J of heat and has 20 J of work done on it. What is the change in internal energy?
Which of the following best describes an adiabatic process?
(1) No heat is exchanged
(2) No work is done
(3) No change in temperature
(4) No change in pressure
Which of the following equations correctly represents the First Law of Thermodynamics?
(1) ΔU = Q + W
(2) ΔU = Q - W
(3) ΔU = W - Q
(4) ΔU = Q × W
Which of the following is a correct statement about the First Law of Thermodynamics?
(1) It only applies to gases.
(2) It is a statement of energy conservation.
(3) It allows for the destruction of energy.
(4) It is not applicable to chemical reactions.
Which of the following is an example of the First Law of Thermodynamics in everyday life?
(1) Melting of ice
(2) Boiling of water
(3) Charging a mobile phone battery
(4) All of the above
Fill in the blank: In a cyclic process, the net change in internal energy is ______.
Fill in the blank: In an isothermal process, the change in internal energy is ______.
Fill in the blank: In the First Law of Thermodynamics, if Q = 0, the process is called an ______ process.
Fill in the blank: The change in internal energy of a system is equal to the heat added to the system minus the ______ done by the system.
True or False: In a closed system, energy can enter or leave the system only as heat or work.
True or False: In an isochoric process, the work done by the system is zero.
True or False: In an isolated system, the total energy remains constant.
True or False: The First Law of Thermodynamics applies to chemical reactions as well as physical processes.
