Physics-Unit 1

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1. Formula to calculate effieciency

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

2. 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

3. Which one of the following words is used to describe the image formed by a plane mirror?

  • Real
  • Invisible
  • Virtual
  • Imaginary

4. Complete this sentence: Energy can neither be ……….. nor ………….. but it can be transferred.

  • Energy can neither be created nor destroyed but it can be transferred.
  • Energy can neither be lost nor destroyed but it can be transferred.
  • Energy can neither be created nor lost but it can be transferred.

5. Complete this sentence Hotter objects emit ………… infrared radiation than cooler objects

  • Hot objects do not emit emit infrared at all
  • Hotter objects emit more infrared radiation than cooler objects.
  • Hotter objects emit more infrared radiation than cooler objects.
  • Hotter objects emit the same amount of infrared radiation than cooler objects.

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