General Science Class 7th MCQs=836

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• Heat is a form of energy that transfer form hotter objects to colder objects because of temperature difference.
• Conduction, convection, and radiation are three different modes of heat transfer.
• In conduction the molecules vibrate about a central point.
• Gases are worst conductors of all.
• Stone is a better conductor of heat than a carpet.
• In convection molecules are free to move about.
• Convection occurs only in liquids and gases
• Coastal breeze is produced by convection.
• Radiation of heat can occur with or without a material medium.
  
• Air is a bad conductor of heat.
• Thermos flask is a type of flask that aims to stop all three forms of heat transfer.

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The heat in metal rod flows by the process of
a) Radiation                
b) Conduction
c) Convection             
d) None of these

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Coastal breeze is produced by……………
PST –P-3---(date not confirm)
a) Radiation                
b) Conduction 
c) Convection             
d) Rain

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In which mode of heat transfer does the transfer of heat occur as a wave?
a) Radiation               
b) Conduction 
c) Convection             
d) all of these

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The normal temperature of human body is …
a) 35⁰C           
b) 37⁰C                       
c) 39⁰C                       
d) 45⁰C

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The flow of heat by conduction is generally observed in case of……………
a) Solid                       
b) Liquid         
c) Gases                      
d) all of these

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