Lakshya Education MCQs

Question: The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
Options:
A.Kinematic viscosity
B.Work
C.Temperature
D.None of these
Answer: Option D

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More Questions on This Topic :

Question 1. Domestic refrigerator usually works on the __________ refrigeration cycle.
  1.    Carnot
  2.    Air
  3.    Absorption
  4.    Vapour-ejection
Answer: Option C
Question 2. At absolute zero temperature, the __________ of the gas is zero.
  1.    Pressure
  2.    Volume
  3.    Mass
  4.    None of these
Answer: Option B
Question 3. The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    Decreases linearly
Answer: Option A
Question 4. An isolated system can exchange __________ with its surroundings.
  1.    Matter
  2.    Energy
  3.    Neither matter nor energy
  4.    Both matter and energy
Answer: Option C
Question 5. Near their critical temperatures, all gases occupy volumes __________ that of the ideal gas.
  1.    Less than
  2.    Same as
  3.    More than
  4.    Half
Answer: Option A
Question 6. A refrigerator works on the principle of __________ law of thermodynamics.
  1.    Zeroth
  2.    First
  3.    Second
  4.    Third
Answer: Option C

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