AIPMT-MAINS Physics Semiconductor Electronics-Materials,Devices & simple Circuits Class 12 Questions

To get an output Y = 1 in given circuit which of the following input will be correct:

A zener diode, having breakdown voltage equal to 15 V is used in a voltage regulator circuit shown in figure. The current through the diode is :

In the following figure, the diodes which are forward biased are

Pure Si at 500 K has equal number of electron (nₑ) and hole (nₕ) concentrations of 1.5 × 10¹⁶ m⁻³. Doping by indium increases nₕ to 4.5 × 10²² m⁻³. The doped semiconductor is of :

The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given. The logic gate is

For transistor action (a) Base, emitter and collector regions should have similar size and doping concentrations. (b) The base region must be very thin and lightly doped. (c) The emitter-base junction is forward biased and base-collector junction is reverse biased. (d) Both the emitter-base junction as well as the base collector junction are forward biased. Which one of the following pairs of statements is correct?

The symbolic representation of four logic gates are given below. The logic symbols for OR, NOT and NAND gates are respectively:

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength: