8th Class Science Combustion and Flame Question Bank

done Self Test-14 Total Questions - 10

• question_answer1)
  Which one of the following is a combustible substance?
  A)
   Cement done clear
  B)
   Glass done clear
  C)
   Wood done clear
  D)
   Water done clear
  E)
   None of these done clear
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• question_answer2)
  Which one of the following is non-combustible substance?
  A)
   LPG done clear
  B)
   CNG                           done clear
  C)
   Sand done clear
  D)
   Charcoal                   done clear
  E)
   None of these                                         done clear
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• question_answer3)
  The process of rusting of iron is an example of:                        
  A)
   Slow combustion done clear
  B)
   Rapid combustion                done clear
  C)
   Explosive combustion done clear
  D)
   All of these                     done clear
  E)
   None of these                                         done clear
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• question_answer4)
  Which one of the following statements is correct? Statement 1: Air is a supporter of combustion Statement 2: Air is not a supporter of combustion
  A)
   Statement 1 done clear
  B)
   Statement 2 done clear
  C)
   Both statements are correct done clear
  D)
   Both statements are incorrect done clear
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• question_answer5)
  The lowest temperature at which a substance catch fire and starts burning is known as:
  A)
   Boiling point done clear
  B)
   Calorific value done clear
  C)
   Ignition temperature done clear
  D)
   Both  and done clear
  E)
   None of these done clear
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• question_answer6)
  Which one of the following substances has lowest ignition temperature?
  A)
   Wood done clear
  B)
   Alcohol     done clear
  C)
   Charcoal done clear
  D)
   Cow-dung done clear
  E)
   None of these done clear
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• question_answer7)
  Which one of the following statements is correct? Statement 1: Inflammable substances have low ignition temperature Statement 2: Coal is an inflammable substance
  A)
   Statement 1 done clear
  B)
   Statement 2 done clear
  C)
   Both statements are correct done clear
  D)
   Both statements are incorrect done clear
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• question_answer8)
  The burning of wax in a candle is an example of:
  A)
   Rapid combustion done clear
  B)
   Spontaneous combustion done clear
  C)
   Explosive combustion done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer9)
  How many zones a flame consists of:
  A)
   One done clear
  B)
   Two        done clear
  C)
   Three done clear
  D)
   Four done clear
  E)
   None of these done clear
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• question_answer10)
  The innermost zone of a flame is:
  A)
   Yellow done clear
  B)
   Blue done clear
  C)
   Black done clear
  D)
   White done clear
  E)
   None of these done clear
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