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Heat and thermodynamics

Class 11 · Physics · 6 questions

Name: ____________________   Date: ____________

  1. The first law of thermodynamics is a statement of conservation of:

    • A Energy
    • B Mass
    • C Charge
    • D Momentum

  2. For an isothermal process the temperature is:

    • A Rising
    • B Constant
    • C Falling
    • D Zero

  3. In an adiabatic process, there is no:

    • A Pressure
    • B Work
    • C Heat exchange
    • D Volume change

  4. The efficiency of a Carnot engine working between 400 K and 300 K is:

    • A 75 percent
    • B 25 percent
    • C 33 percent
    • D 100 percent

  5. Entropy of an isolated system tends to:

    • A Stay zero
    • B Decrease
    • C Become negative
    • D Increase

  6. The molar gas constant R is about:

    • A 8.31 J/mol K
    • B 83.1 J/mol K
    • C 0.0821 J/mol K
    • D 1.38 J/mol K

Answer key

1. A, 2. B, 3. C, 4. B, 5. D, 6. A

  1. Heat added = change in internal energy + work done.

  2. Isothermal means at constant temperature.

  3. Adiabatic means no heat enters or leaves the system.

  4. Efficiency = 1 - 300 / 400 = 0.25.

  5. The second law says the entropy of an isolated system does not decrease.

  6. R is about 8.31 J per mole per kelvin.