Physics-Unit 1

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1. Why do many scientists think adding carbon dioxide to the atmosphere is harmful to the environment?

  • Carbon dioxide causes global dimming.
  • Carbon dioxide causes global warming
  • Carbon dioxide causes visual pollution.
  • Carbon dioxide is the main cause of acid rain
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2. 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.

3. 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

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

  • Invisible
  • Imaginary
  • Virtual
  • Real

5. What determines the pitch of a sound?

  • None of these
  • Amplitude
  • Frequency
  • Loudness

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