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

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

The figure shows a logic circuit with two inputs A and B and the output C. The voltage wave forms across A, B and C are as given. The logic circuit gate is

Transfer characteristics [output voltage(V₀) vs input voltage (Vᵢ)] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used

If a small amount of antimony is added to germanium crystal

In forward biasing of the p-n junction

Symbolic representation of four logic gates are shown as. Pick out which ones are for AND, NAND and NOT gates, respectively:

The device that can act as a complete electronic circuit is

Which of the following statements is false...

To get an output Y = 1 from the circuit shown below, the input must be

The symbolic representation of four logic gates are given below:

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

The circuit is equivalent to -

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly :

In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is

A forward biased diode is:

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below :

Application of a forward bias to a p-n junction:

Zener diode is used for :

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)Si and (Eg)Ge respectively. Which one of the following relationships is true in their case?

Choose the only false statement from the following:

Of the diodes shown in the following diagrams, which one of the diode is reverse biased ?

In semiconductors at a room temperature

The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10V. The d. c. component of the output voltage is :-

In a p-n junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to :-

The output of OR gate is :-

Reverse bias applied to a junction diode

A n-p-n transistor conducts when

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be :

Barrier potential of a p-n junction diode does not depend on -

Following diagram performs the logic function of :

In a P N junction :-

The given truth table is for which logic gate : - $$\begin{array}{|c|c|c|} \hline \text{A} & \text{B} & \text{Y} \\ \hline 1 & 1 & 0 \\ \hline 0 & 1 & 1 \\ \hline 1 & 0 & 1 \\ \hline 0 & 0 & 1 \\ \hline \end{array}$$

For the given circuit of P⁻N junction diode which is correct :-

Following truth table represent which logic gate – $$\begin{array}{|c|c|c|} \hline \text{A} & \text{B} & \text{C} \\ \hline 1 & 1 & 0 \\ \hline 0 & 1 & 1 \\ \hline 1 & 0 & 1 \\ \hline 0 & 0 & 1 \\ \hline \end{array}$$

From the following diode circuit. Which diode in forward biased condition :

Given Truth table is correct for :