Physics
Which one of the following is responsible for the working of Newton's colour disc experiment ?

Formation of pure spectra
Persistence of vision
Formation of impure spectra
Principle of complementary colour

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Physics
Rainbow is due to

diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets
ionisation of water deposits
absorption of sunlight in minute water droplets

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Physics
The velocity of sound in air

Does not depend on temperature
Decreases with decrease of temperature
Increases with decrease of temperature
Decreases with increase of temperature

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