Practice CSS General Knowledge questions with answers and explanations.
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Freezing removes energy from a liquid until it forms a solid.
For pure water at standard pressure, this occurs at 0°C.
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The iris changes the size of the pupil.
This regulates how much light enters the eye.
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Evaporation occurs at the surface of a liquid.
Higher temperature and moving air usually increase its rate.
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The lens focuses incoming light onto the retina.
Photoreceptor cells then convert light into nerve signals.
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Condensation occurs when gas particles lose energy.
Water vapor condenses into droplets on a cool surface.
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Red light has the longest wavelength in the visible spectrum.
Violet has the shortest visible wavelength.
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The highest-energy water molecules escape during evaporation.
This lowers the average energy and temperature of the skin.
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Violet light has the shortest wavelength among visible colors.
It also has the highest visible-light frequency.
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Wind carries away water vapor near the fabric.
This maintains a concentration difference and speeds evaporation.
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Rayleigh scattering is stronger for shorter visible wavelengths.
Scattered blue light reaches observers from many directions.
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Conduction transfers thermal energy through particle interactions.
It is especially important in solids.
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Convection occurs when warmer fluid moves and cooler fluid replaces it.
It happens in liquids and gases.
