What is the reading of the ideal ammeters A₁ and A₂ connected in the given circuit diagram, if $\mathrm{p}-\mathrm{n}$ junction diodes are ideal?

   

1. 2 A and zero

2. 3 A and 2 A

3. 2 A and 3 A

4. Zero and 2 A

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.

The combination of gates shown in the diagram is equivalent to:
              

1. OR

2. AND

3. NAND

4. NOT

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

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.

The depletion layer in the P–N junction region is caused by:

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.

The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance R₁ will be:
     

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/an: