Branched chain lipids occur in the cell membranes of

What is the current through an ideal $P-N$ junction diode shown in the figure below? (in $mA$)

Extraction of zinc from zinc blende is achieved by:

The metal used for the de-bromination reaction of $1, 2-dibromoethane$ is:

In the circuit shown below,the ammeter reading is zero. Then the value of the resistance $R$ is (in $Omega$)

$A$ sonometer wire has a length of $114 ~cm$ between two fixed ends. Where should two bridges be placed so as to divide the wire into three segments (in $cm$) whose fundamental frequencies are in the ratio $1:3:4$?