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Isobaric heating: share of heat going to work and to internal energy

This type of question, asked 13 times: 3 May 2023 S2, 4 May 2023 S1, 9 May 2023 S1, 9 May 2023 S2, 15 May 2023 S1, 16 May 2023 S1, 16 May 2023 S2, 19 Apr 2025 S2, 22 Apr 2025 S1, 22 Apr 2025 S2, 25 Apr 2025 S2, 14 May 2026 S2, 19 May 2026 S2. All 15 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    3 May 2023 S2

    17
    A monoatomic gas is heated at constant pressure. The percentage of total heat used for doing external work is

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  2. Question 2

    4 May 2023 S1

    41
    In an isobaric process of an ideal gas, the ratio of work done by the system to the heat supplied WQ\frac{W}{Q} is

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  3. Question 3

    9 May 2023 S1

    42
    For an ideal gas, in an isobaric process, the ratio of heat supplied QQ to the work done WW by the system is (γ\gamma = ratio of specific heat at constant pressure to that at constant volume)

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  4. Question 4

    9 May 2023 S2

    42
    In an isobaric process of an ideal gas, the ratio of work done by the system (W) during the expansion and the heat exchanged (Q) is γ=CpCv\gamma = \frac{C_p}{C_v}

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  5. Question 5

    15 May 2023 S1

    49
    A quantity of heat QQ is supplied to monoatomic ideal gas which expands at constant pressure. The fraction of heat converted into work is γ=Cp/Cv=5/3\gamma = C_{p}/C_{v} = 5/3

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  6. Question 6

    15 May 2023 S1

    9
    The ratio of work done by an ideal rigid diatomic gas to the heat supplied by the gas in an isobaric process is

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  7. Question 7

    16 May 2023 S1

    38
    An ideal diatomic gas is heated at constant pressure. What is the fraction of total energy applied, which increases the internal energy for the gas?

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  8. Question 8

    16 May 2023 S1

    20
    If heat energy ΔQ\Delta Q is supplied to an ideal diatomic gas, the increase in internal energy is ΔU\Delta U and the amount of work done by the gas is ΔW\Delta W. The ratio ΔW:ΔU:ΔQ\Delta W : \Delta U : \Delta Q is

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  9. Question 9

    16 May 2023 S2

    38
    A monoatomic ideal gas is heated at constant pressure. The percentage of total heat used in changing the internal energy is

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  10. Question 10

    19 Apr 2025 S2

    46
    A monoatomic ideal gas is heated at constant pressure. The percentage of total heat used in increasing the internal energy and that used for doing external work is AA and BB respectively. Then the ratio, A:BA:B is

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  11. Question 11

    22 Apr 2025 S1

    27
    When an ideal gas (γ=53)\left( \gamma=\frac{5}{3} \right) is heated under constant pressure, then what percentage of given heat energy will be utilised in doing external work?

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  12. Question 12

    22 Apr 2025 S2

    50
    In an isobaric process of an ideal gas, the ratio of heat supplied and work done by the system (QW)\left( \frac{Q}{W} \right) is [CpCv=γ]\left\lbrack \frac{C_{p}}{C_{v}}= \gamma \right\rbrack.

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  13. Question 13

    25 Apr 2025 S2

    21
    A sample of an ideal gas (γ=53)\left( \gamma=\frac{5}{3} \right) is heated at constant pressure. If 100 J of heat is supplied to the gas, the work done by the gas is

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  14. Question 14

    14 May 2026 S2

    114
    If the ratio of molar heat capacities CpCv=γ\dfrac{C_p}{C_v} = \gamma then the ratio of ΔQΔU\dfrac{\Delta Q}{\Delta U} and ΔQΔW\dfrac{\Delta Q}{\Delta W} in an isobaric process is

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  15. Question 15

    19 May 2026 S2

    116
    Heat is supplied to a rigid diatomic gas at constant pressure. The ratio of ΔQ:ΔU:ΔW\Delta Q : \Delta U : \Delta W is {ΔQ\Delta Q = heat supplied, ΔU\Delta U = change in internal energy, ΔW\Delta W = work done during expansion}

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