Exam preparation MCQs with answers

Practice Pakistan's most useful MCQs for competitive exams

Prepare for NTS, PPSC, FPSC and subject-wise tests with fresh multiple choice questions, clear options and quick answer reveal.

Latest MCQs

Pick up the incorrect statement?
  • (A)  lithium bromide used in vapour absorption cycle is nonvolatile
  • (B)  lithium bromide plant can’t operate below 0°C
  • (C)  a separator is used in lithium bromide plant to remove the unwanted water vapour by condensing
  • (D)  concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator
  • (E)  weak solution in liquid heat exchanger gives up heat to the strong solution
Choose the wrong statement ?
  • (A)  Temperature of medium being cooled must be below that of the evaporator
  • (B)  Refrigerant leaves the condenser as liquid
  • (C)  All solar thermally operated absorption systems are capable only of intermittent operation
  • (D)  frost on evaporator reduces heat transfer
  • (E)  refrigerant is circulated in a refrigeration system to transfer heat
Which one of the following statements is not correct_________________?
  • (A)  the tangent of the angle of friction is equal to coefficient of friction
  • (B)  the angle of repose is equal to angle of friction
  • (C)  the tangent of the angle of repose is equal to coefficient of friction
  • (D)  the sine of the angle of repose is equal to coefficient to friction
  • (E)  none of the above
In order that a cycle be reversible, following must be satisfied ________________?
  • (A)  free expansion or friction resisted expansion/compression process should not be encountered
  • (B)  when heat is being absorbed, temperature of hot source and working sub¬stance should be same
  • (C)  when beat is being rejected, temperature of cold source and working sub-stance should be same
  • (D)  all of the above
  • (E)  none of the above