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If q is the amount of heat absorbed by t...

If `q` is the amount of heat absorbed by the system and `W` the amount of work done on the system `(+ve)`, the change in the energy of the system is given by:

A

`q=DeltaU+W`

B

`q=DeltaU-W`

C

`DeltaU=q-W`

D

`DeltaU=W+q`

Text Solution

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The correct Answer is:
B, D
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First law of thermodynamics is the general law of conservation of energy as applied to heat energy. According to this law, whenever heat is added to a system, it transforms to an equal amount of some other forms of energy. If dQ= a small amount of heat supplied to the system, dW= small amount of work done by the system and dU= small change in internal energy of the system, then dQ=dU+dW . Read the above passage and answer the following questions: (i) The amount of heat obsorbed by a gas is 10 cals and work done on the gas in 58J . Calculate increase in internal energy of the gas. (ii) What values of life do you learn fron this law?

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Knowledge Check

  • If the amount of heat given to a system is 35 J and the amount of work done on the system is 15 J, then the change in internal energy of the system is

    A
    `-50 J`
    B
    20J
    C
    `-20 J`
    D
    50 J

  • If the amount of heat given to a system is 3 5 J and the amount of work done on the system is 15 J, then the change in internal energy of the system is

    A
    -30J
    B
    20J
    C
    30J
    D
    50J

  • If the amount of heat given to a system is 40 J and the amount of work done on the system is 15 J then the change in internal energy is

    A
    50 J
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    `-50J`
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