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6. Why is a high voltage used?

  • So they can transfer the electricity at a high current
  • It increases the amount of energy wasted in cables
  • It decreases the amount of energy wasted in cables
  • The cables cannot transfer low voltage electricity

7. What does a decrease in wavelength of an object suggest?

  • That the object is stationary
  • That it is moving closer to the observer
  • It is moving away from the observer

8. What is transferred through the National Grid?

  • Gas
  • Electricity
  • Oil
  • Coal

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

  • Virtual
  • Invisible
  • Imaginary
  • Real

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

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

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

  • Energy can neither be created nor lost 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.

12. 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

13. What is the National Grid?

  • A system of cables, transformers and power stations
  • A power station
  • A system of cables and transformers
  • A system of cables and pylons.

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

  • Hotter objects emit more 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 the same amount of infrared radiation than cooler objects.

15. What determines the pitch of a sound?

  • None of these
  • Frequency
  • Loudness
  • Amplitude

16. What is meant by the payback time for different methods of home insulation?

  • Payback time shows us the time the installment takes
  • Payback time shows us the amount we pay for installments
  • The payback time tells us how long it takes to save enough money to pay for the cost of installation.
  • Payback time shows us how much energy we save

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

  • Microwaves
  • Gamma rays
  • Visible light
  • Ultraviolet