question_answer

  The electric bell of Mr. Sharma's house is not working. He asks his son to get it changed.His son first checks for the fault. The gong is found displaced, he repairs it to work again. (a) Sketch the values of Mr. Sharma. (b) Which values of his son are appreciable? (c) On which principle is electric bellbased? Explain that principle andgive one more practical applicationof it. Or Sakshi's bus arrives at 7:40 am. Shereaches the stop at 7:35 am and waits. Sohan does not reach at even 7:45 am Sakshi goes up to driver and asks himto close the engine, who ignores it. (a) Appreciate the values of Sakshi. (b) What values must be illustrated in Sohan and driver? (c) Why does Sakshi ask the driver toclose the engine? (d) Burning of fuel is chemical change orphysical change. (e) The fuel used in the bus is renewableor non-renewable.

Answer:

  (a) Mr Sharma is not bothered to check, spend thrift and shares responsibility.                                                  (1) (b) His son is logical, thoughtful and practical.                                                                                                                      (1) (c) Electric bell works on the principle of magneticeffect of electric current.                                                         (1) Magnetic Effect of Electric Current When electric current flows through a conductor, amagnetic field is produced around it. This is called magnetic effect of electric current.                                                                           (1) Electromagnet is also a practical application of magnetic effect of electric current.                                             (1) Or (a) Sakshi is concerned on fuel conservation, consciousof environment pollution and punctual.                  (1) (b) Sohan needs to be more punctual. The driver must become more accommodating, nature Concerned and respect others views.                                                                                                                                                                    (1) (c) Sakshi asks the driver to close the engine to savethe fuel.                                                                     (1) (d) Burning of fuel is chemical change.                                                                                                                                   (1) (e) The fuel used in the bus is petroleum, which is anon-renewable source of energy.                                    (1)