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The internal energy of a substance:...

The internal energy of a substance:

A

Increases with increase in temperature

B

Decreases with increase in temperature

C

Remains constant

D

Calculated by `E=mc^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
The fixed quantity of any substance is associated with a definite amount of energy which depends upon chemical nature of the substance and its state of energy. This energy is called Internal energy or intrinic energy(`mu` ). It is a state function and increases with increase in temperature.
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Knowledge Check

  • The internal energy of a system is

    A
    state function
    B
    path property
    C
    qualitative property
    D
    intensive property

  • Statement: Internal energy of a system is an extensive property. Explanation: The internal energy of a system depends upon the amount and physical state of the susbtance.

    A
    `S` is correct but `E` is wrong.
    B
    `S` is wrong but `E` are correct and `E`
    C
    Both `S` and `E` are correct but `E` is correct explanation of `S`.
    D
    Both `S` and `E` are correct but `E` is not correct explanation of `S`.

  • Assertion : The internal energy of an isothermal process does not change. Reason : The internal energy of a system depends only on pressure of the system.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of t he assertion.
    C
    If assertion is true but reason is false.
    D
    If the assertion and reason both are false

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    An ideal gas is taken through the process ABC as shown in figure. If the internal energy of the substance decreases by 10000J and a heat of 7159 cal is released by the system, calculate the value of meachanical equivalent of heat (J) .

    Making use of the Carnot theorem, show that in the same of physically uniform substance whose state is defined by the parameters T and V (del U//delV)_T = T(del p//del T)_v - p where U(T, V) is the internal energy of the substance. Consider the infinitesmal Carnot cycle in the variables p, V .

    A: The internal energy of a solid substance increases during melting. R: Latent heat is required to melt a solid substance.

    What is thermal energy of a substance?

    Assertion:Absolute values of intenal energy of substances cannot be determined. Reason:It is impossible to determine exact values of constituent energies of the substances.

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