Physics MCQs 3

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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.
Set 3
  1. In all real processes where heat transfer occurs, the enery available for doing work
    1. Increases
    2. Decreases
    3. Remains constant
    4. Fifty fifty
  2. Carnot engines working between the same two temperatures have the same efficiency irrespective of:
    1. Temperature
    2. Working substance
    3.  internal energy
    4. all
  3. In Adiabatic process :
1. PV(gamma)=constant
2. expansion is very fast
3. internal energy
4. all
      4. All changes which occur suddenly or which involve friction or dissipation of energy are  
                  1. Reversible
                  2. Irreversible
                  3. Adiabatic
                  4. isochoric
      5. The entropy of all reversible process:
                  1. Increases
                  2. Decreases
                  3. Remains same
                  4. none

Answers:
  1. Decrease
  2. Working substance
  3. All
  4. Irreversible
  5. Remains same 




  1. What will be the change in entropy when 1 kg of ice at 0 degree centigrade is converted into water at same temperature(Latent heat of ice is 336J/g)
         1. 1231
         2. 293
         3. 273
         4. 100
    2. In the Carnot engine when heat is taken from the source, its temperature
  1. Increases
  2. Remains same
  3. Decreases
  4. May increase or decrease

      3. Cold milk is poured into a hot cup of tea and is mixed with spoon. Is this cooling of tea an example of :
  1. Reversible
  2. Irreversible
  3. Cyclic process
  4. none
      4. In a room the door of an electric refrigerator is kept open. What effect it will have on the temperature of the room
  1. It will increase
  2. It will remains same
  3. It will decrease
  4. none
     5. A Carnot engine absorb a quantity of heat 1000 j from a source and does useful work of 300 J. The heat rejected is:
  1. 300J
  2. 1000J
  3. 700J
  4. 500J 


    1. 1231
    2. Decreases
    3. Irreversible process
    4. It will remains same
    5. 700J

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

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