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MCQs

Total Questions : 207 | Page 5 of 21 pages
Question 41. What is the basic working principle of direct solar dryers?
  1.    Direct exposure of substance to fire
  2.    Direct use of sunlight to start a heater which is then used to dry the substance
  3.    Indirect exposure of substance to sunlight
  4.    Dehydrating the substance by directly exposing to sunlight
 Discuss Question
Answer: Option D. -> Dehydrating the substance by directly exposing to sunlight
Answer: (d).Dehydrating the substance by directly exposing to sunlight
Question 42. How do wet clothes laid on wired lines dry under sunlight?
  1.    Wind blows to accumulate more air consisting moisture near the clothes
  2.    Wind blows away the moisture near the wet clothes air exposing them to fresh air and sunlight
  3.    Sunlight continuously evaporates water in wet clothes without any assistance from wind
  4.    Wind blows away the moisture near the wet clothes air exposing them to fresh air
 Discuss Question
Answer: Option B. -> Wind blows away the moisture near the wet clothes air exposing them to fresh air and sunlight
Answer: (b).Wind blows away the moisture near the wet clothes air exposing them to fresh air and sunlight
Question 43. How does an indirect solar dryer work?
  1.    By directly exposing the substance to sunlight
  2.    By using an electrical heater
  3.    By heating the incoming air with the help of a black surface
  4.    By using fire
 Discuss Question
Answer: Option D. -> By using fire
Answer: (d).By using fire
Question 44. Which of the following best indicates an example of direct solar dryer?
  1.    Drying wet clothes on wired lines
  2.    Using the dryer of a washing machine
  3.    Using an electric heater
  4.    Using a solar heater
 Discuss Question
Answer: Option A. -> Drying wet clothes on wired lines
Answer: (a).Drying wet clothes on wired lines
Question 45. Which of the following surface is best suited to absorb sunlight?
  1.    White surface
  2.    Red surface
  3.    Black surface
  4.    Silver surface
 Discuss Question
Answer: Option C. -> Black surface
Answer: (c).Black surface
Question 46. Indirect solar dryers protect the food.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 47. _______ are used as air exhausts in indirect solar dryers.
  1.    Turbines
  2.    Ceiling fans
  3.    Chimneys
  4.    Table fans
 Discuss Question
Answer: Option C. -> Chimneys
Answer: (c).Chimneys
Question 48. Why is direct solar dryer harmful for food?
  1.    Because direct sunlight could chemically alter some food items
  2.    Because direct sunlight dries the food
  3.    Because direct solar dryer does not cover the food
  4.    Because of contaminants brought by wind
 Discuss Question
Answer: Option A. -> Because direct sunlight could chemically alter some food items
Answer: (a).Because direct sunlight could chemically alter some food items
Question 49. A glass cover _______ solar dryers.
  1.    decreases the efficiency of
  2.    is not used in
  3.    does not affect the efficiency of
  4.    increases the efficiency of
 Discuss Question
Answer: Option D. -> increases the efficiency of
Answer: (d).increases the efficiency of
Question 50. Which of the following best explains the increment in efficiency of a glass covered solar dryer?
  1.    Greenhouse effect
  2.    Greenhouse gas
  3.    Climate change
  4.    Thermohaline circulation
 Discuss Question
Answer: Option A. -> Greenhouse effect
Answer: (a).Greenhouse effect

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