List of top Physics Questions on Semiconductor electronics: materials, devices and simple circuits asked in TS EAMCET

The substance which has an energy band gap equal to the energy of the spectral line corresponding to the shortest wavelength of Paschen series of the hydrogen spectrum is:
The resultant logic gate of the combination of logic gates given in the circuit is:
An electron in n-region enters p-region with speeds $5\times10^5$ m/s and $3\times10^5$ m/s before and after barrier. Find barrier potential.
Two OR gates and one AND gate are connected as shown. Find correct truth table output Y.
The ratio of energies of forbidden bands of silicon and germanium is nearly
A pure silicon with $6 \times 10^{28}$ atoms is doped with arsenic of 1 ppm concentration. If the intrinsic carrier concentration is $1.2 \times 10^{16} m^{-3}$, then the number of holes in the doped silicon is}
The negative feedback in an amplifier
The current amplification factor of a transistor in common emitter configuration is 80. If the emitter current is 2.43 mA, then the base current is
Which of the following logic gates is a universal gate?
The graph between the input voltage ($V_i$) and the output voltage ($V_o$) of a transistor connected in common emitter configuration is shown in the figure. The active, saturation and cutoff regions of the transistor are respectively
For a common emitter transistor amplifier, the voltage across the collector resistance is 2.8 V. If the current amplification factor of the transistor is 70 and the collector resistance is 2 k$\Omega$, then the base current is
If the breakdown voltage of a Zener diode is 7.2 V and the maximum power dissipated is 216 mW, then the maximum current through the Zener diode is
Five logic gates are connected as shown in the figure. If the inputs are A=C=1 and B=D=0, then the values of y1 and y2 respectively are
A Zener diode of breakdown voltage 6 V is connected as shown in the circuit. The power dissipated in the Zener diode is
The intrinsic carrier concentration of a semiconductor is $1.2\times10^{16}$ m$^{-3}$. On doping with an impurity, the electron concentration becomes $20\times10^5$ times initial concentration. The concentration of holes in the doped semiconductor is:
In a common emitter amplifier, the collector resistance is 3 times the base resistance. If the common emitter current amplification factor is 60, then the power gain of the amplifier is:
If the energy gap of a semiconductor used for the fabrication of an LED is nearly 1.9 eV, then the color of the light emitted by the LED is
According to a graph drawn between the input and output voltages of a transistor connected in common emitter configuration, the region in which transistor acts as a switch is