Basic General Knowledge
To produce sound it is necessary that

the vibrations of source are not necessary
the source may execute any type of vibrations
the source should execute transverse vibrations
the source should execute longitudinal vibrations

ANSWER DOWNLOAD EXAMIANS APP

Basic General Knowledge
Fa-Hien was

the discoverer of Puerto Rico and Jamaica
None of these
the first Buddhist pilgrim of India to visit China
the first Buddhist pilgrim of China to visit India during the reign of Chandragupta Vikramaditya

ANSWER DOWNLOAD EXAMIANS APP