What is the equivalent resistance across the terminals of the battery if the diodes are ideal?

   

1.	\(10~ \Omega\)	2.	\(20~ \Omega\)
3.	\(15~ \Omega\)	4.	\({10\over3} ~ \Omega\)

What is the name of the logic gate represented by the following symbol?
             

1. NOR

2. OR

3. NAND

4. AND

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

1. OR

2. AND

3. NAND

4. NOT

For the logic circuit given below, the output Y for A=0, B=0 and A=1, B=1 are:

1. 0 and 1

2. 0 and 0

3. 1 and 0

4. 1 and 1

A photocell is illuminated by a point source of radiation 4 m away. If the same source is kept 8 m away, then the number of photoelectrons emitted:

1. becomes four times the initial value.

2. becomes one-fourth of the initial value.

3. remains unchanged.

4. becomes half of the initial value.

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

Which one of the following represents an analog circuit diagram for OR gate?

1.		2.
3.		4.

Which of the following-junction is used unbiased?

1. Photo diode

2. LED

3. Zener diode

4. Solar cell

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

Current $I_1$ through the Zener diode shown in the circuit is:
      
1. Zero
2. 0.6 mA
3. 0.2 mA
4. 0.8 mA