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Physics answers Question and answers already passed

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  • PHYSICS

Physics answers Question and answers already passed Physics answers Air inside fridge forms convection current when closed because - correct answer Air near freezer compartment is cooled and cool air is more dense than warm air so cooler air falls and air at bottom is displace and rises ...

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  • October 19, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • PHYSICS
  • PHYSICS

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Physics answers
Air inside fridge forms convection current when closed because - correct
answer ✔Air near freezer compartment is cooled and cool air is more dense
than warm air so cooler air falls and air at bottom is displace and rises


Electricity is generated in a hydroelectric power station - correct answer
✔Water moves from high level to low level, transferring g.p.e to k.e and
rotating a turbine to turn a generator which transfers k.e to electrical energy


Frequency of 440 hz means - correct answer ✔440 sound waves produced
in a second


Gas and nuclear power stations would be used to meet the demand of
electricity during a 24 hour period by - correct answer ✔Gas can be switched
on quickly but nuclear cannot, gas can be used to meet surges on demand
and nuclear used to generate all the time


Gases will spread out and fill the container and are easy to compress because
- correct answer ✔Particles are far apart and space between particles (easy
to compress) move randomly no forces of attraction so spread out in all
directions (fill container)


Inside and outside of oven are light- coloured and shiny because - correct
answer ✔Inside surface is a good reflector of infrared radiation and outside
surface is poor emitter of infrared radiation and increases energy reaching
food


One kilo gram of gas has a much larger volume than a solid using kinetic
theory explain why - correct answer ✔Strong forces of attraction between

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