Physics
Which sources produce alternating current (AC)?

Hydro-electric generators
All of these
Batteries
Solar power plants

ANSWER DOWNLOAD EXAMIANS APP

Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Refraction of the sun light
Interference of the sun light from water surface

ANSWER DOWNLOAD EXAMIANS APP