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First Law of Thermodynamics

Physics ⇒ Heat and Thermodynamics

First Law of Thermodynamics starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in First Law of Thermodynamics. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A gas absorbs 1000 J of heat and its internal energy increases by 700 J. How much work is done by the gas?
A gas expands isothermally and does 250 J of work. How much heat is supplied to the gas?
A gas is compressed adiabatically and its temperature increases. Explain this observation using the First Law of Thermodynamics.
A system is supplied with 250 J of heat and 100 J of work is done on the system. What is the change in internal energy?
A system receives 800 J of heat and does 500 J of work. What is the final change in internal energy?
A system releases 300 J of heat and does 100 J of work. What is the change in internal energy?
Describe a practical example where the First Law of Thermodynamics is applied.
During a cyclic process, a system absorbs 600 J of heat and does 600 J of work. What is the net change in internal energy?
During an adiabatic expansion, a gas does 400 J of work. What is the change in its internal energy?
Explain the significance of the negative sign in the equation ΔU = Q - W.
Explain why internal energy is a state function but work and heat are not.
Explain why the First Law of Thermodynamics does not specify the direction of heat flow.
If 500 J of heat is supplied to a system and the system does 200 J of work, what is the change in internal energy of the system?
If a system absorbs 400 J of heat and its internal energy increases by 250 J, what is the work done by the system?
If a system does 150 J of work and its internal energy decreases by 200 J, how much heat was supplied to the system?
In a thermodynamic process, the internal energy of a system increases by 500 J while 200 J of work is done on the system. Calculate the heat supplied to the system.
State the First Law of Thermodynamics.