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The picture shows a bimetallic strip in a fire alarm. When there is a fire outbreak, the bimetallic strip will get hot, ....
bend downwards, complete the circuit and the alarm rings.
bend upwards, open the circuit and the alarm will not ring.
becomes longer, open the circuit and the alarm will not ring.
Which of the following is an example of convection?
A hair dryer is drying up your hair.
When the AC or heater changes the temperature.
When a car engine turns hot after being turned on.
When you are making soup and the water is rising and lowering.
Dull black surfaces are....
good as an emitter of radiation
good as an absorber of radiation
poor as an emitter of radiation
poor as an absorber of radiation
How is this vacuum flask effective in reducing thermal transfer?
Radiation is eliminated by the vacuum space
Conduction is eliminated by the vacuum space
Convection is eliminated by the vacuum space
Radiation is reduced by the silver surface
What are the colors of the left and right side of the Leslie cube shown in the photo?
Left: Black Right: Black
Left:White Right: Black
Left: Black Right: Silver
Left: White Right: White