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SAI INTERNTIONAL SCHOOL
                                                        Class 8
                                                Home Assignment
                                                 Subject- Physics
                                        Ch- Some Natural Phenomena

                                   Subtopic- Terms related to earthquake




                   INSTRUCTIONS:
                         Please solve or paste the worksheet in the Physics Copy.
                         For Assertion& Reason question follow the following directions.
                          DIRECTION: Each of these questions contains an Assertion followed by Reason.
                          Read them carefully and answer the question on the basis of following options. You
                          have to select the one that best describes the two statements.
                          (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.
                       1.    Assertion: Most damage due to an earthquake happens at and around                     1
                            epicenter.
                            Reason: It is point just above focus.
                       2.    Assertion: Mercalli scale can be used to analyse the damage                           1
                            Reason: It is based on the effects of an earthquake.
                   Fill in the blanks
                       3.    _________ is a scale in which measures the power of Earthquake                        1
                       4.    The instrument used to detect and record earthquakes is __________.                   1
                       5.    _________ is the point below the Earth’s crust where earthquake originates.           1
                   MCQ
                       6.    The boundaries of tectonic plates are called ________                                 1
                            a)  Safe zones
                            b)  Strong zones
                            c)  Weak zones
                            d)  Border zones
                       7.    The earth’s plate responsible for causing earthquakes is                              1
                            a)  the crust of the earth
                            b)  the mantle of the earth
                            c)  the inner core of the earth
                            d)  the outer core of the earth
                       8.    Explain seismic focus and write the names of three earthquake prone states in         3
                            India.
                       9.    What is a seismograph? Make a diagram of seismograph (from NCERT                      3
                            textbook).
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