Physics
Magnetic keepers are used to protect magnets from :

Earth's magnetic field
Demagnetization due to heating
Self-demagnetization
Effect of other magnets

ANSWER DOWNLOAD EXAMIANS APP

Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Interfacing synthesizer equipment.
Representing data in terms of measurable physical quantities.

ANSWER DOWNLOAD EXAMIANS APP