Physics
Vehicle tyres are inflated properly

To avoid skidding and to minimise friction
To allow the vehicle to take more load.
To ensure smooth running.
To go fast and save fuel.

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Physics
Radiocarbon is produced in the atmosphere as a result of

Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Lightning discharge in atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.

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