Photodiode

Q. When the current changes from 2A to -2A in 0.05 second an end of 8 V is induced in a coil . The coefficient of self inductance of coil is

Q. A photodiode has two p-n junctions.

1. False
2. True

Q. A p-n photodiode is fabricated with a semiconductor having band gap of 3 $ev$, then

1. It can detect $\lambda =500nm$
2. It cannot detect $\lambda =300nm$
3. It can detect $\lambda =240nm$
4. It cannot detect $\lambda =400nm$

Q. In a PN junction photo cell, the value of photo-electromotive force produced by monochromatic light is proportional to

1. The voltage applied at the PN junction
2. The barrier voltage at the PN junction
3. The intensity of the light falling on the cell
4. The frequency of the light falling on the cell

Q. A photodiode has two p-n junctions.

1. False
2. True

Q. which of the following does not follow ohm law.
(a)Copper
(b)Aluminium
(c)Diode-valve
(d)None of these