Physics
Boyle's law relates to

Elasticity of Solids
Viscosity of Liquids
Kinetic Theory of Gases
Plasticity of Solids

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Physics
Lightning is produced when

Similar charges of electricity rush towards each other and then get repelled
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds
Clouds strike against impurities in air and the friction burns up these impurities

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at sea level
at a place in a valley below sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at the top of Mt. Everest

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