their resistivity is lesser

their barrier potential is higher

their barrier potential is lower

these are lesser temperature sensitive

1 micro A

100 micro A

1 mA

100 mA

threshold voltage

peak inverse voltage

cut-in-voltage

avalanche voltage

they can work both on positive and negative supplies

they consist of both P-type and N-type semiconductor

the conduction of current through them is caused by both 'holes' and 'free electrons'.

of all the three above stated reasons

Germanium, rectifier

Silicon, rectifier

Germanium, signal detector

Silicon, signal detector