The correct symbol for zener diode is:

1.		2.
3.		4.

Which of the following graphs may correctly represent the variation of current (l) with potential difference (V) across a zener diode?

1.		2.
3.		4.

An LED is constructed from a \(\mathrm{p\text{-}n}\) junction diode using \(\mathrm{GaAsP}\). The energy gap is \(1.9~\text{eV}\). The wavelength of the light emitted will be equal to:
1. \(10.4 \times 10^{-26} \text{m}\)
2. \(654~ \text{nm}\)
3. \(654~ \text{m}\)
4. \(654\times 10^{-11}~\text{m}\)

Zener breakdown will occur if:
1. impurity level is low.
2. impurity level is high.
3. impurity is less on the n-side.
4. impurity is less on the p-side.

In the given circuit, the power developed in 2 k$\Omega$ resistor is:

1. 36 mW

2. 12 mW

3. 144 mW

4. 72 mW

The LED:

1. is reverse-biased.

2. is forward-biased.

3. can be made of GaAs.

4. both (2) & (3) are correct.

A Zener diode is used to obtain a constant voltage. If applied voltage \(\text V\) changes, then:
(\(\text V\) is more than Zener voltage)
             

The given graph represents the V-I characteristic for a semiconductor device. Which of the following statement is correct?

A Zener diode is shown in the following circuit diagram. When the source voltage fluctuates such that $V>V_z$, then:
   

1. all the current I₁, I₂ and I₃ change.

2. only I₁ and I₂ change and I₃ remains constant.

3. only I₁ and I₃ change and I₂ remains constant.

4. all the currents remain constant.