2. Sample Papers
  3. 10th Class
  4. Science

10th Class Science Sample Paper Sample Paper - 1 Term - 1

  • question_answer
    Why is the zig-zag copper tube painted black in a solar water heater?  

    Answer:

    Black bodies are good absorbers of heat energy and copper is a good conductor of heat. Blackend copper pipes rapidly transfer the solar energy to the water and help in rapid heating. That's why copper tube is painted black in solar water heater.                                                                                                                         (1 + 1)  


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