• ( 4 ) Molecular transmission of heat is smallest in case of

    • 1) Gases
    • 2) Liquids
    • 3) Liquids with impurities
    • 4) Solids
    • Discussion in forum
      Answer : 1) Gases
      Solution :








      discussion


      Answer : 1) Gases

    • ( 5 ) Metals are good conductors of heat because

    • 1) They contain free electrons
    • 2) Their atoms are relatively far apart
    • 3) Their atoms collide frequently
    • 4) They have reflecting surfaces
    • Discussion in forum
      Answer : 1) They contain free electrons
      Solution :








      discussion


      Answer : 1) They contain free electrons

    • ( 6 ) The heat transfer takes place according to

    • 1) Kirchhoff's law
    • 2) First law of thermodynamics
    • 3) Zeroth law of thermodynamics
    • 4) Second law of thermodynamics
    • Discussion in forum
      Answer : 4) Second law of thermodynamics
      Solution :








      discussion


      Answer : 4) Second law of thermodynamics

    • ( 7 ) Which of the following has the minimum absorptivity ?

    • 1) Iron plates
    • 2) Coal dust
    • 3) Refractory bricks
    • 4) Aluminium foil
    • Discussion in forum
      Answer : 4) Aluminium foil
      Solution :








      discussion


      Answer : 4) Aluminium foil

    • ( 8 ) In pipe flow, heat is transferred from hot wall to the liquid by

    • 1) free and forced convection.
    • 2) conduction only
    • 3) forced convection only.
    • 4) forced convection and conduction.
    • Discussion in forum
      Answer : 4) forced convection and conduction.
      Solution :








      discussion


      Answer : 4) forced convection and conduction.

    • ( 9 ) Radiator of an automobile engine is a __________ type of heat exchanger.

    • 1) direct contact
    • 2) counter-current
    • 3) cross-current
    • 4) co-current
    • Discussion in forum
      Answer : 1) direct contact
      Solution :








      discussion


      Answer : 1) direct contact





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