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Which of the following circuits is reverse - biased ?

In the given circuit if the power rating of Zener diode is \( 10\,\mathrm{mW} \), the value of series resistance \( R_s \) to regulate the input unregulated supply is:

The output \( Y \) of following circuit for given inputs is:

The correct truth table for the following logic circuit is:

The I–V characteristics of an electronic device shown in the figure. The device is:

The value of net resistance of the network as shown in the given figure is:

To measure the temperature coefficient of resistivity \( \alpha \) of a semiconductor, an electrical arrangement shown in the figure is prepared. The arm BC is made up of the semiconductor.The experiment is being conducted at \( 25^\circ \) and resistance of the semiconductor arm is \( 3\,\text{m}\Omega \). Arm BC is cooled at a constant rate of \( 2^\circ\text{C}/\text{s} \). If the galvanometer G shows no deflection after \( 10\,\text{s} \), then \( \alpha \) is:

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than \( 660 \, \text{nm} \). The band gap of photodiode is found to be \( \left(\dfrac{X}{8}\right) \, \text{eV} \). The value of \( X \) is:
(Given, \( h = 6.6 \times 10^{-34} \, \text{J s}, \, e = 1.6 \times 10^{-19} \, \text{C} \) )

A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is \( 1.42 \, \text{eV} \). The wavelength of light emitted from the LED is:

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON):

A Zener diode of breakdown voltage \( 10 \, \text{V} \) is used as a voltage regulator as shown in the figure. The current through the Zener diode is:

The truth table for this given circuit is:
 

The output of the given circuit diagram is:

In the given circuit, the voltage across load resistance \( (R_L) \) is:

A potential divider circuit is connected with a dc source of \( 20 \, \text{V} \), a light emitting diode of glow in voltage \( 1.8 \, \text{V} \) and a zener diode of breakdown voltage of \( 3.2 \, \text{V} \). The length \( (PR) \) of the resistive wire is \( 20 \, \text{cm} \). The minimum length of \( PQ \) to just glow the LED is __________ \( \text{cm} \).

The output \( (Y) \) of logic circuit given below is \( 0 \) only when:

The truth table of the given circuit diagram is:

Identify the logic operation performed by the given circuit.

In the given circuit, the breakdown voltage of the Zener diode is \( 3.0 \, \text{V} \). What is the value of \( I_z \)?

In the truth table of the above circuit the value of \(X\) and \(Y\) are: