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1.
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
2.
A photodetector used to detect the wavelength of 1700 nm, has energy gap of about
3.
A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of
4.
Which of the following has negative temperature coefficient of resistance
5.
The logic circuit shown below has the input waveforms 
and 
as shown. Pick out the correct output waveform.
and as shown. Pick out the correct output waveform.
6.
Zener breakdown in a semi-conductor diode occurs when
7.
The band gap in germanium and silicon in 
respectively is
respectively is
8.
Which of the following is a dichroic crystal
9.
Figure shows a diode connected to an external resistance and an emf. Assuming that the barrier potential developed in diode is 0.5 V, obtain the value of current in the circuit in milli ampere.
10.
The depletion layer of a p-n junction