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Which of the following statements are correct? i. land and sea breezes are natural convection...

Physics
JAMB 1990

Which of the following statements are correct? i. land and sea breezes are natural convection currents. ii. convection may occur in liquids or gasses but not in solids. iii. the vacuum in a thermos flask prevents heat loss due to convection only.

  • A. i and ii only
  • B. i and iii only
  • C. i and iii only
  • D. i, ii, and iii
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Correct Answer: Option A
Explanation

 real-life examples of convection: 

  • Breeze. The formation of sea and land breeze form the classic examples of convection. 
  • Boiling Water. 
  • Blood Circulation in Warm-Blooded Mammals.
  • Air-Conditioner.
  • Radiator.
  • Refrigerator.         

 

  • The vacuum between the two walls prevents heat being transferred from the inside to the outside by conduction and convection.

 

 

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