Physics-Unit 1

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

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

  • Evaporation
  • Convection
  • Radiation
  • Conduction

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

  • Real
  • Virtual
  • Imaginary
  • Invisible

4. 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.

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

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

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