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MCQs

Total Questions : 38 | Page 3 of 4 pages
Question 21. Heat conduction in gases is due to
  1.    Elastic impact of molecules
  2.    Movement of electrons
  3.    EM Waves
  4.    Mixing of gases
 Discuss Question
Answer: Option A. -> Elastic impact of molecules
Answer: (a).Elastic impact of molecules
Question 22. The heat energy propagation due to conduction heat transfer will be minimum for
  1.    Lead
  2.    Water
  3.    Air
  4.    Copper
 Discuss Question
Answer: Option C. -> Air
Answer: (c).Air
Question 23. Choose the false statement
  1.    For pure metal thermal conductivity is more
  2.    Thermal conductivity decreases with increase in the density of the substance
  3.    Thermal conductivity of dry material is lower than that of damp material
  4.    Heat treatment causes variation in thermal conductivity
 Discuss Question
Answer: Option B. -> Thermal conductivity decreases with increase in the density of the substance
Answer: (b).Thermal conductivity decreases with increase in the density of the substance
Question 24. What is the thermal conductivity of asphalt in W/m K?
  1.    0.064
  2.    0.063
  3.    0.062
  4.    0.061
 Discuss Question
Answer: Option C. -> 0.062
Answer: (c).0.062
Question 25. Cork is a good insulator because
  1.    It is flexible
  2.    It can be powdered
  3.    Low density
  4.    It is porous
 Discuss Question
Answer: Option D. -> It is porous
Answer: (d).It is porous
Question 26. Which one is having highest thermal conductivity?
  1.    Silver
  2.    Copper
  3.    Glass
  4.    Earth
 Discuss Question
Answer: Option A. -> Silver
Answer: (a).Silver
Question 27. What is the thermal conductivity of magnetite in W/m K?
  1.    3.7
  2.    3.8
  3.    3.9
  4.    4.0
 Discuss Question
Answer: Option B. -> 3.8
Answer: (b).3.8
Question 28. Which one is having lowest thermal conductivity?
  1.    Furnace
  2.    Wool
  3.    Saw dust
  4.    Glass wool
 Discuss Question
Answer: Option D. -> Glass wool
Answer: (d).Glass wool
Question 29. What is the thermal conductivity of coal in W/m K?
  1.    0.25
  2.    0.26
  3.    0.27
  4.    0.28
 Discuss Question
Answer: Option B. -> 0.26
Answer: (b).0.26
Question 30. What is the thermal conductivity of cotton in W/m K?
  1.    0.03
  2.    0.04
  3.    0.05
  4.    0.06
 Discuss Question
Answer: Option D. -> 0.06
Answer: (d).0.06

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