What is the reading of the ideal ammeters \(A_1\) and \(A_2\) connected in the given circuit diagram, if \(\mathrm{p\text-n}\) junction diodes are ideal?

    

1.	\(2~\text A\)  and zero	2.	\(3~\text A\)  and \(2~\text A\)
3.	\(2~\text A\)  and \(3~\text A\)	4.	Zero and \(2~\text A\)

 

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 the applied voltage \(V\) changes, then:
(\( V\) is more than Zener voltage)
               

 
1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)

The LED:

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

The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \(R_1\) 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: