Semiconductor Electronics: Materials, Devices and Simple Circuits Test 53

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 53

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Weekly Quiz Competition

Question 1
1 / -0

Choose the correct option:
Electrical conductivity of a semi conductor-

A
decreases with rise in its temperature.

B
increases with rise in its temperature.

C
does not changes with temperature.

D
first decreases and then increases with rise in temperature.

Solution

Electrical conductivity of semi-conductor increases with increase in temperature whereas electrical conductivity of conductor decreases with increase in temperature.
Question 2
1 / -0

When a PN junction diode is reverse biased

A
Electrons and holes are attracted towards each other and move towards the depletion region

B
Electrons and holes move away from the junction depletion region

C
Heights of the potential barrier decreases

D
No change in the current takes place

Solution

When a p-n junction is reversed biased, the negative terminal of the battery attracts the free holes in the p-type towards itself whereas the positive terminal attracts the free electrons in n-type towards itself. Hence, the electrons and the holes move away from the junction which results in increasing of the depletion width as well as the potential barrier.
Question 3
1 / -0

Identity the gate in the figures

A
AND

B
NOR

C
XOR

D
NAND

Solution

Truth table
$$A$$ $$B$$ $$\overline{AB}$$
0 0 1
0 1 1
1 0 1
1 1 0
This is the truth table of NAND gate.
The correct option is D.
Question 4
1 / -0

The Boolean expression for NAND gate is -

A
$$Y = A + B$$

B
$$Y = A.B$$

C
$$Y = \overline {A + B}$$

D
$$Y = \overline {A. B}$$

Solution

The Boolean algebra for $${\text{AND}}$$ gate is-
$$Y = A.B$$
So, the Boolean algebra for $${\text{NAND}}$$ gate is-
$$Y = \overline {A.B} $$
Question 5
1 / -0

The thickness of the P-N junction is m.

A
$${10^{ - 2}}$$

B
$${10^{ - 6}}$$

C
$${10^{ - 8}}$$

D
$${10^{ - 12}}$$

Solution

A $${\text{p - n}}$$ junction is made of a $${\text{p - }}$$type semiconductor and a $${\text{n - }}$$type semiconductor. In general, he thickness of a $${\text{p - n}}$$ junction is in the order of $${10^{ - 6}}m$$
Question 6
1 / -0

Select and write the correct option from the options given in each question:
Optical Detector is:

A
Diode Laser

B
Laser

C
LED

D
Photo Diode

Solution

An optical detector is a device that can detect light energy and thereby can change it to electrical energy. So, the correct option is the Photo Diode.
Question 7
1 / -0

Find current through the ideal diode.

A
Zero

B
20A

C
0.05 A

D
0.15 A

Solution

The current should flow from $$10{\text{ Volt}}$$ to $${\text{5 Volt}}$$, but the diode is connected in the reverse bias. Hence, the current through the circuit is Zero.
Question 8
1 / -0

The circuit given is equivalent to

A
OR gate

B
AND gate

C
NAND gate

D
NOR gate

Solution

If we do the Boolean algebra for the whole system, we will get the truth table of the output as follows-
$$1,0,0,0$$
This is the truth table of the $${\text{NOR}}$$ gate.
Option (D) is correct.
Question 9
1 / -0

Good resistance coils are made of ?

A
Copper

B
Manganin

C
Gold

D
Silver

Solution

Copper, gold, and silver are good conductors and they have negligible resistance.
But Manganin has good resistance.
Ans. (B)
Question 10
1 / -0

The combination of NAND gates shown here under (figure) are equivalent to

A
An OR gate and an AND gate respectively

B
An AND gate and a NOT gate respectively

C
An AND fate and an OR gate respectively

D
An OR gate and a NOT gate respectively.

Solution