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 11
A gas expands at constant pressure, doing 400 J of work and absorbing 600 J of heat. What is the change in internal energy?
A gas is compressed by a piston, and 250 J of work is done on the gas. If the internal energy increases by 100 J, how much heat is exchanged and in which direction?
A gas is compressed in a cylinder by a piston. The gas releases 150 J of heat to the surroundings and the work done on the gas is 200 J. What is the change in internal energy of the gas?
A system does 100 J of work on its surroundings and its internal energy decreases by 250 J. How much heat was transferred to or from the system?
A system does 50 J of work and its internal energy increases by 120 J. How much heat was supplied to the system?
A system receives 300 J of heat and its internal energy increases by 100 J. How much work is done by the system?
Describe a real-life example where the First Law of Thermodynamics is applied.
Describe what happens to the internal energy of a system if it absorbs heat but does no work.
Explain the difference between state functions and path functions with examples relevant to the First Law of Thermodynamics.
Explain why heat and work are not state functions.
If a system absorbs 500 J of heat and does 200 J of work, what is the change in its internal energy?
If a system undergoes a cyclic process, what is the net work done by the system equal to?
If no heat is exchanged with the surroundings (Q = 0), what type of thermodynamic process is this?
In an isothermal process, the change in internal energy of an ideal gas is:
State the First Law of Thermodynamics.
A gas in a cylinder is taken through a process in which it absorbs 800 J of heat and its internal energy increases by 500 J. Calculate the magnitude and direction of the work done by the gas during this process.
A gas is compressed isothermally and 500 J of work is done on the gas. What is the amount of heat exchanged and in which direction?
A gas is taken from state A to state B along two different paths. In both cases, the change in internal energy is the same, but the heat supplied and work done are different. Explain why this is consistent with the First Law of Thermodynamics.
A gas is taken through a cyclic process. If the net heat absorbed by the gas is 1200 J, what is the net work done by the gas during the cycle?
A system absorbs 200 J of heat and has 300 J of work done on it. What is the change in internal energy?
