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MCQs

Total Questions : 38 | Page 2 of 4 pages
Question 11. Transmission of heat i.e. molecular is smallest in case of
  1.    Gases
  2.    Liquids
  3.    Alloys
  4.    Solids
 Discuss Question
Answer: Option A. -> Gases
Answer: (a).Gases
Question 12. “Thermal conductivity represents the amount of heat conducted across unit area when a temperature difference of one kelvin”. True or false
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 13. Which one is not the unit of thermal conductivity?
  1.    kcal/m hr K
  2.    KJ/m hr K
  3.    W/m s K
  4.    Cal/cm s K
 Discuss Question
Answer: Option C. -> W/m s K
Answer: (c).W/m s K
Question 14. Thermal conductivity is defined as the heat flow per unit time
  1.    When temperature gradient is unity
  2.    Across the wall with no temperature
  3.    Through a unit thickness of the wall
  4.    Across unit area where temperature gradient is unity
 Discuss Question
Answer: Option D. -> Across unit area where temperature gradient is unity
Answer: (d).Across unit area where temperature gradient is unity
Question 15. Which of the following is the unit of thermal resistance?
  1.    degree/kcal
  2.    hour degree
  3.    s degree/kcal
  4.    degree/W
 Discuss Question
Answer: Option D. -> degree/W
Answer: (d).degree/W
Question 16. The average thermal conductivities of water and air conform to the ratio
  1.    50:1
  2.    25:1
  3.    5:1
  4.    15:1
 Discuss Question
Answer: Option B. -> 25:1
Answer: (b).25:1
Question 17. Mark the matter with least value of thermal conductivity
  1.    Air
  2.    Water
  3.    Ash
  4.    Window glass
 Discuss Question
Answer: Option A. -> Air
Answer: (a).Air
Question 18. Which one of the following forms of water have the highest value of thermal conductivity?
  1.    Boiling water
  2.    Steam
  3.    Solid ice
  4.    Melting ice
 Discuss Question
Answer: Option C. -> Solid ice
Answer: (c).Solid ice
Question 19. Identify the very good insulator
  1.    Saw dust
  2.    Cork
  3.    Asbestos sheet
  4.    Glass wool
 Discuss Question
Answer: Option D. -> Glass wool
Answer: (d).Glass wool
Question 20. Most metals are good conductor of heat because of
  1.    Transport of energy
  2.    Free electrons and frequent collision of atoms
  3.    Lattice defects
  4.    Capacity to absorb energy
 Discuss Question
Answer: Option B. -> Free electrons and frequent collision of atoms
Answer: (b).Free electrons and frequent collision of atoms

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