Physics
Purpose of an optical filter is to

Dispense light into component colours
Transmit or absorb light of different colours
Refract light of different colours
Reflect lights of different colours

ANSWER DOWNLOAD EXAMIANS APP

Physics
Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside.
normal atmospheric pressure is maintained by the use of air pumps.
normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.

ANSWER DOWNLOAD EXAMIANS APP

Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy
Absence of gravity outside

ANSWER DOWNLOAD EXAMIANS APP