8th Class Science Combustion and Flame Question Bank

done Self Test-14

• question_answer1) Which one of the following is a combustible substance?

  A) Cement

  B) Glass

  C) Wood

  D) Water

  E) None of these

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• question_answer2) Which one of the following is non-combustible substance?

  A) LPG

  B) CNG

  C) Sand

  D) Charcoal

  E) None of these

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• question_answer3) The process of rusting of iron is an example of:

  A) Slow combustion

  B) Rapid combustion

  C) Explosive combustion

  D) All of these

  E) None of these

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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

  B) Statement 2

  C) Both statements are correct

  D) Both statements are incorrect

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• question_answer5) The lowest temperature at which a substance catch fire and starts burning is known as:

  A) Boiling point

  B) Calorific value

  C) Ignition temperature

  D) Both and

  E) None of these

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• question_answer6) Which one of the following substances has lowest ignition temperature?

  A) Wood

  B) Alcohol

  C) Charcoal

  D) Cow-dung

  E) None of these

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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

  B) Statement 2

  C) Both statements are correct

  D) Both statements are incorrect

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• question_answer8) The burning of wax in a candle is an example of:

  A) Rapid combustion

  B) Spontaneous combustion

  C) Explosive combustion

  D) All of these

  E) None of these

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• question_answer9) How many zones a flame consists of:

  A) One

  B) Two

  C) Three

  D) Four

  E) None of these

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• question_answer10) The innermost zone of a flame is:

  A) Yellow

  B) Blue

  C) Black

  D) White

  E) None of these

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