Physics
The energy that generates wind comes from what source?

None of these
Solar radiation
Anemometers
Ocean currents

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that increases with depth
Because streamlining is required
To withstand pressure that is increased with atmospheric pressure

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

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