Physics-Unit 1

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1. Formula to calculate effieciency

  • Efficiency = (useful energy out/total energy in)/100
  • Efficiency = useful energy out/total energy in (*100%)
  • Efficiency = [useful energy out*total energy in (*100%)]
  • Efficiency = total energy in/useful energy out (*100%)
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Other questions in this quiz

2. Which type of electromagnetic wave has the smallest wavelength?

  • Gamma rays
  • Microwaves
  • Ultraviolet
  • Visible light

3. Which one of the following is not a renewable energy source?

  • Oil
  • Wind
  • Solar
  • Geothermal

4. The angle of incidence and the angle of refraction are equal when diffraction occurs?

  • True they are both equal
  • False, it depends on the medium
  • False, the angle of reflection is smaller
  • False, the angle of reflection is bigger

5. Why don't birds get electrocuted when they stand on pylon wires?

  • Birds do not conduct electricity
  • None of the above
  • As they are not connected to any grounded point, the electricity will not flow through the bird and will continue through the cables
  • They do get electrocuted


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