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The first law of thermodynamics is based on:
The first law of thermodynamics is based on:
- Law of conservation of energy (correct)
- Law of conservation of mechanical energy
- Law of conservation of gravitational P.E.
- None of the above
If the initial internal energy of a gas was 30 joules and it releases 20 joules of heat while 8 joules of work is done on it, then the final internal energy will be:
If the initial internal energy of a gas was 30 joules and it releases 20 joules of heat while 8 joules of work is done on it, then the final internal energy will be:
- 58 J
- 2 J
- 18 J (correct)
- 42 J
In a process where 500 calories of heat is given to a system and 100 joules of work is done on the system, the increase in the internal energy of the system is:
In a process where 500 calories of heat is given to a system and 100 joules of work is done on the system, the increase in the internal energy of the system is:
- 2193 joules
- 82 calories (correct)
- 40 calories
- 1993 joules
When a system is taken from state 'a' to state 'b' along the path 'acb', 200 J of heat is absorbed and 80 J of work is done by it. Along the path 'adb', the quantity of heat absorbed is:
When a system is taken from state 'a' to state 'b' along the path 'acb', 200 J of heat is absorbed and 80 J of work is done by it. Along the path 'adb', the quantity of heat absorbed is:
The first law of thermodynamics is a restatement of the:
The first law of thermodynamics is a restatement of the:
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Study Notes
First Law of Thermodynamics
- The first law of thermodynamics is based on the conservation of energy.
- If the initial internal energy of a gas is 30 joules, and it releases 20 joules of heat while 8 joules of work is done on it, the final internal energy will be 30 - 20 + 8 = 18 joules.
- In a process where 500 calories of heat is given to a system and 100 joules of work is done on the system, the increase in the internal energy of the system is 500 cal + 100 J = 690 J (since 1 cal = 4.184 J).
- When a system is taken from state 'a' to state 'b' along the path 'acb', 200 J of heat is absorbed and 80 J of work is done by it.
- The first law of thermodynamics is a restatement of the law of conservation of energy.
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