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Subjective Questions

         Q. No.                                   Questions                                      Skill   Marks
           1.     Give an example of a non - combustible substance.                               U         1

           2.     Give one example of a combustible substance.                                    U         1

           3.     Choose the correct option from the following:                                   U         1
                  (a) If both Assertion and Reason are correct and Reason is the correct
                  explanation of Assertion.
                  (b) If both Assertion and Reason are correct, but Reason is not the
                  correct explanation of Assertion.
                  (c) If Assertion is correct but Reason is incorrect.
                  (d) If Assertion is incorrect but Reason is correct.
                  (e) If Assertion & Reason both are incorrect.
                  Assertion (A): Combustion is a chemical process.
                  Reason (R): In combustion, a new substance with a new property is
                  formed.
           4.        a.  Define combustion.                                                     R + U     1 + 1
                     b.  How can you say that respiration is also an example of                  + R      + 1 =
                         combustion?                                                                        3
                     c.  Define fuel.

           5.        a.  Explain with the help of a chemical equation what happens              U + R     3 + 2
                         when magnesium ribbon is burnt in air.                                            = 5
                     b.  Differentiate between combustible and non-combustible
                         substances.















































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