Physics
The electrical domestic tube light gives white fluorescent light because of

Falling of ultra violet rays on the white inner coating of the tube
Heavy current
Colision between molecules of filled gas under electric current
Vacuum inside the tube

ANSWER DOWNLOAD EXAMIANS APP

Physics
Light houses are places with powerful lights to :

Guide and help large crowds at religious gathering during nights
Indicate to the incoming warships, the location of a harbour during night
Guide and resolve traffic jams in crowded metro-cities during nights
Guide and warn the ships coming from different directions in the ocean

ANSWER DOWNLOAD EXAMIANS APP

Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
He may increase his speed
His weight may be reduced

ANSWER DOWNLOAD EXAMIANS APP