Physics
The ordinary and maximum tolerance limit of sound by human being is

65 db to 75 db (decibel)
70 db to 85 db (decibel)
50 db to 70 db (decibel)
60 db to 80 db (decibel)

ANSWER DOWNLOAD EXAMIANS APP

Physics
Holography is a technique of

Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional multicolour photograph
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional black and white photograph

ANSWER DOWNLOAD EXAMIANS APP