Class 7    General Science    Example [SC-7.4]

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Q 1. Transfer of heat in fluid medium is called ----------.
 
  • radiation
  • convection
  • conduction
  • diffusion
 
Q2. State true or false: "During radiation, the particles of the medium vibrates".
  • FALSE
  • Blank
  • TRUE
  • None of the above
 
Q3. The mode of the transfer of heat in the absence of a medium is called ----------.
  • diffusion
  • convection
  • radiation
  • conduction
 
Q4. Copper is better ---------- of heat than iron.
  • convertor
  • conductor
  • radiator
  • diffuser
 
Q5. Heat is transferred in three ways, which are, conduction, convection and ----------.
  • acceleration
  • diffraction
  • evaporation
  • radiation
Q6. State true or false: "A white body absorbs more heat than a black body".
  • FALSE
  • TRUE
  • Maybe
  • None of these
 
Q7. The temperature at which a solid substance changes into a liquid is called the ---------- of the substance.
  • boiling point
  • neutral point
  • melting point
  • fusion point
 
Q8. Substances through which heat travels easily and quickly are said to be ---------- of heat.
  • good conductors
  • bad conductors
  • non-metals
  • insulators
 
Q9. State true or false: "Convection takes place in liquids and gases".
  • FALSE
  • Maybe
  • TRUE
  • None of the above
 
Q10. What is the melting point of Mercury ?
  • - 49 degrees C
  • - 39 degrees C
  • - 39 degrees F
  • - 49 degrees F
   
 
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