9th Class Science Sample Paper Sample Paper - 5 Term - 1

  • question_answer
      Alka's mother bought a new refrigerator which was frost free. Alka was unaware of the frost free technology of refrigerator. She wanted to know about this. So, she asked to her mother about this. (a) What are the values shown by Alka? (b) How did her mother explain suchthing?


      (a) The values shown by Alka are curiosity, eager and learner.                                                                                    (1) (b) She explained that in frost free refrigerator, ice does not deposit in the freezer of a refrigerator. These refrigerators are equipped with defrosting technique i.e., the ice deposited on the walls of the freezer during thecooling cycle sublimes when warm air is circulated through the compartment during the defrost cycle. As aresult of these repeated cooling and defrosting cycles, icedoes not deposit.                                                    (1)

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