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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?
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