In the given figure, a diode $D$ is connected to an external resistance $R = 100~\Omega$ and an EMF of $3.5~\text{V}$. If the barrier potential developed across the diode is $0.5~\text{V}$, the current in the circuit will be:
  
1. $30~\text{mA}$
2. $40~\text{mA}$
3. $20~\text{mA}$
4. $35~\text{mA}$

If in a $\mathrm{p\text{-}n}$ junction, a square input signal of $10~\text{V}$ is applied as shown, 

 
then the output across $R_L$ will be:

1.		2.
3.		4.

Which logic gate is represented by the following combination of logic gates? 

    

1. $\mathrm{OR}$
2. $\mathrm{NAND}$
3. $\mathrm{AND}$
4. $\mathrm{NOR}$

The given graph represents the $\mathrm{V\text{-} I}$ characteristic for a semiconductor device.

Which of the following statement is correct?

The barrier potential of a $\mathrm{p\text{-}n}$ junction depends on: 

Which one of the following is correct?
1. (a) and (b) only
2. (b) only
3. (b) and (c) only
4. (a), (b) and (c)

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is: