Semiconductor Devices And Logic Gates - Modern Physics - Physics Previous Year Questions

To get output 1 for the following logic circuit, the correct choice of the inputs is

Match the devices given in List-I with their uses given in List-II.

The correct answer is

A zener diode of zener voltage 30 V is connected in circuit as shown in the figure. The maximum current through the zener diode is

An electron in $n$-region of a $p-n$ junction moves towards the junction with a speed of $5 \times 10^5 \mathrm{~ms}^{-1}$. If the barrier potential of the junction is 0.45 V , then the speed with which the electron enters the $p$-region after penetration through the barrier is

(Charge of the electron $=1.6 \times 10^{-19} \mathrm{C}$ and mass of the electron $=9 \times 10^{-31} \mathrm{~kg}$ )

$10^{10}$ electrons enter the emitter of a junction transistor in a time of $0.4 \mu \mathrm{~s}$. If $5 \%$ of the electrons are lost in the base, then the collector current is

The power gain and voltage gain of a transistor connected in common emitter configuration are 1800 and 60 respectively. If the change in the emitter current is 0.62 mA , then the change in the collector current is

Six logic gates are connected as shown in the figure. The values of $y_1, y_2$ and $y_3$ respectively are

The graph between the input voltage $\left(V_i\right)$ 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

Which of the following logic gates is a universal gate?

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

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

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

The negative feedback in an amplifier

Three logic gates are connected as shown in the figure. If the inputs are $A=1, B=0$ and $C=1$, then the values of $y_1, y_2$ and $y_3$ respectively are

At absolute zero temperature, a semiconductor behaves like