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7th Class Science Sample Paper Science Sample Paper - 8

  • question_answer
    (i) Why does a glowing electric bulb become warm?                                        
    (ii) Mention any two effects of electric current.
    (iii) Why does a glowing CFL not become warm?

    Answer:

    (i) Part of electricity supplied produces heating effect.                                                                                 
    (ii) Electricity produces two effects:
    (a) Heating effect.
    (b) Magnetic effect                                                                                                                                 
    (iii) The electricity supplied is mostly used to produce light and heating effect is minimum


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