Physics MCQs 4

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MCQ's with answers from Physics for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.
  1. The maximum possible efficiency of a heat engine working between 473 degree centigrade and 100 degree centigrade
    1. 30 %
    2. 45%
    3. 60%
    4. 50%
  2. An ideal heat engine exhausting heat at 77 degree is to have a 30 % efficiency. It must take heat at
    1. 127 degree centigrade
    2. 227 degree centigrade
    3. 327 degree centigrade
    4. 673 degree centigrade
  3. 110J of heat is added to a gaseous system whose internal energy is 40 J. Then the amount of external work done is
    1. 150J
    2. 40j
    3. 110J
    4. 70J
  4. In isothermal expansion the pressure is determined by
    1. Compressibility only
    2. Temperature only
    3. Both a and b
    4. none
  5. A given system undergoes a change in internal energy in which the work done by the system equals the decrease in its internal energy. The system must have undergone an
    1. Isothermal change
    2. Isobaric change
    3. Adiabatic change
    4. Isochoric change
  6. In an adiabatic process the quantity which remains constant is
    1. Internal energy
    2. Volume
    3. Temp.
    4. none
  7. The specific heat of a gas in an isothermal process is
    1. Infinity
    2. Zero
    3. Negative
    4. Remain
    5. constant
  8. The first operation involved in Carnot cycle is
    1. Isothermal expansion
    2. Adiabatic expansion
    3. Isothermal compression
    4. Adiabatic compression
  9. A carnot engine take 300 cal of heat at 500 K and rejects 150 cal of heat to the sink. The temperature of the sink is
    1. 100K
    2. 700K
    3. 125K
    4. 250K
  10. The cold reservoir of carnot engine is at 0 degree and the hot reservoir at 546 degree centigrade. The efficiency of engine is
    1. 1
    2. 2/3
    3. ½
    4. 1/3
  11. Law of conservation of energy can be related to
    1. Isothermal process
    2. Human metabolism
    3. Adiabatic expansion
    4. all
  12. No heat engine is more efficient than a reversible engine when working between the same two limits of temperature is a statement of
    1. First law of thermodynamics
    2. 2nd law of thermodynamics
    3. Joule’s law
    4. Carnot’s theorem
  13. Which of the following is not a function of state of a systems
    1. Pressure
    2. Temperature
    3. Heat
    4. Internal energy


 Answers:

  1. Calculate it using formula eta=(1-T2/T2) 100
  2. 227
  3. 70J
  4. Compressibility only
  5. Adiabatic change
  6. None
  7. Infinity
  8. Isothermal expansion
  9. 250K
  10. 2/3
  11. All
  12. Carnot’s theorem
  13. heat

I am Mechatronics and Control Engineer from UET, Lahore. Helping Engineering students gives me pleasure.

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