Page 1 - 4.HOME ASSIGNMENT-(CONCEPT OF CATHODE AND ANODE RAYS)
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SAI International School
                                                       Class-IX

                                                Subject- Chemistry
                                             Topic-Structure of atom

                              Subtopic- Concept of Cathode and anode rays
                                    Concept of Cathode and Anode Rays
                OBJECTIVE QUESTIONS
                 Q.1     Assertion: Cathode rays are negatively charged
                         Reason: Cathode rays consist of electrons.
                 Q.2     Assertion: Anode rays from all the gases are similar.
                         Reason: Anode rays are composed of protons.
                 Q.3     Assertion:  Electrons are negatively charged particles.
                         Reason: Cathode rays are composed of electrons.
                 Q.4     Assertion: Protons are positively charged particles.
                         Reason: Protons are integral particles of all the atoms.
                 Q.5     Assertion: Mass of an electron is negligible.
                                                                  th
                         Reason: Mass of an electron is 1/1840  of the mass of a proton.
                 Q.6     Who discovered electron?
                         a) E. Goldstein        b) Bohr          c) J.J. Thomson                d) J. Chadwick
                 Q.7     Mass of proton is
                         a)     equal to the mass of hydrogen atom
                         b)     less than the mass of hydrogen atom
                         c)     negligible
                         d)     more than the mass of hydrogen atom


               SUBJECTIVE
            S.LNo.  Questions                                                                      Mark
            Q.1        What are canal rays? Why are they named so?                                 1

            Q.2        Give the mass and charge of an electron.                                    1

            Q.3        How are the canal rays particles different from electrons in terms of       3
                       charge and mass?
            Q.4        What are cathode rays? Write two important properties of cathode            3
                       rays.
            Q.5        a) How were electrons discovered and by whom?                               5
                       b)Write the difference between cathode and anode rays?















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