Physics
Vehicles use ________ to see the objects coming from behind.

Convex mirror
Concave mirror
Concave lens
Convex lens

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Physics
Pressure Cooker cooks faster because

It cooks the food at low pressure
Higher temperature is attained for cooking
Boiling point decreases with rise of pressure
The material of the cooker is a good conductor

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

Plastics have a higher thermal conductivity than metals
Plastics have a lower density than metals
Metals have higher thermal capacity than plastics
Metals are good conductors of heat

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