Physics
What is the phenomenon which established the transverse nature of light ?

Reflection
Interference
Diffraction
Polarisation

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Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Refraction of the sun light
Scattering of the sunlight by water molecules
Interference of the sun light from water surface

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals are good conductor of heat
metals have higher thermal capacity than plastics
plastics have a higher thermal conductivity than metals
plastics have a lower density than metals

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