Semiconductor Electronics: Materials, Devices and Simple Circuits Test 61

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 61

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Weekly Quiz Competition

Question 1
1 / -0

Electric current is due to drift of electron in

A
Metallic conductor

B
Semi-conductor

C
Both $$(a)$$ and $$(b)$$

D
None of these

Solution

Drift current is the electric current caused by particles getting pulled by an electric field. The term is most commonly used in the context of electrons and holes in semiconductors, although the same concept also applies to metals, electrolytes, and so on.
Question 2
1 / -0

The mobility of free electron is greater than that of free holes because

A
The carry negative charge

B
They are light

C
They mutually collides less

D
They require low energy to continue their motion

Solution

The mobility of free electron is greater than that of free holes because they require low energy to continue their motion.
Question 3
1 / -0

A logic gate is an electronic circuit which

A
makes logical decisions.

B
allows electron flow only in one direction.

C
works using binary algebra.

D
alternates between $$0$$ and $$1$$ value.

Solution

A logic gate is an electronic circuit that makes logical decisions.
Question 4
1 / -0

The following configuration of gate is equivalent to

A
$$NAND$$

B
$$XOR$$

C
$$OR$$

D
$$None\ of\ these$$

Solution

$$Y=(A+B). \overline {AB}$$
The given output equation can also be written as
$$Y=(A+B)(\bar {A}+\bar {B})$$ (De morgan's theorem)
$$=\bar {AA}+\bar {AB}+\bar {BA}+\bar {BB}=0+A\bar {B}+\bar {A}B+0=\bar {A}B+A\bar {B}$$
This is the expression for $$XOR$$ gate.
Question 5
1 / -0

The given figure shows the wave forms for two inputs $$A$$ and $$B$$ and that for the output $$Y$$ of a logic circuit. The logic circuit is

A
An $$AND$$ gate

B
An $$OR$$ gate

C
An $$NAND$$ gate

D
An $$NOT$$ gate

Solution

From the given waveforms, the following truth table can be made
Time interval Inputs Output
$$A$$ $$B$$ $$Y$$
$$0 \to T_1$$ $$0$$ $$0$$ $$0$$
$$T_1 \to T_2$$ $$0$$ $$1$$ $$0$$
$$T_2\to T_3$$ $$1$$ $$0$$ $$0$$
$$T_3\to T_4$$ $$1$$ $$1$$ $$1$$
Thus truth table is equivalent to $$'AND'$$ gate.
Question 6
1 / -0

The symbol shown in the adjoining figure is

A
NOT gate

B
OR gate

C
AND gate

D
NOR gate

Solution

Not gate
Question 7
1 / -0

In the circuit shown, find the current through the Zener diode.

A
$$5\ mA$$

B
$$1\ mA$$

C
$$15\ mA$$

D
$$25\ mA$$

Solution

Since $$2000 \Omega$$ is parallel to Zener diode
So, the current passing through it as shown in the circuit,
$$i_{3} = \dfrac {50}{2000} = 25\ mA$$
Potential difference across $$1000\Omega$$,
$$V_{1} = 100 - 50 = 50\ V$$
So, the electric current passing through it,
$$i_{1} = \dfrac {50}{1000} = 50\ mA$$
So, current through Zener diode,
$$i_{2} = 50 - 25 = 25\ mA$$
Question 8
1 / -0

A truth table is given below. Which of the following has this type of truth table ?
A
0
1
0
1
B
0
0
1
1
Y
1
0
0
0

A
XOR gate

B
NOR gate

C
AND gate

D
OR gate

Solution

In NOR: $$\bar Y=\bar{A+B}$$
i.e., $$\bar{0+0}=\bar{0}=1; $$
$$\bar{1+0}=\bar{1}=0$$
$$\bar{0+1}=\bar{1}=0;$$
$$\bar{1+1}=0$$
Question 9
1 / -0

The following figure shows a logic gate circuit with two inputs A and B the output Y. The voltage waveforms of A, B and Y are as given-
The logic gate is-

A
OR gate

B
AND gate

C
NAND gate

D
NOR gate

Solution
Question 10
1 / -0

A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of:

A
each of them increases

B
each of them decreases

C
copper increases and germanium decreases

D
copper decreases and germanium increases.

Solution

Copper is metallic conductor and germanium is semiconductor therefore as temperature decreases resistance of good conductor decreases while for semiconductor it increases.

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Time interval	Inputs		Output
	$$A$$	$$B$$	$$Y$$
$$0 \to T_1$$	$$0$$	$$0$$	$$0$$
$$T_1 \to T_2$$	$$0$$	$$1$$	$$0$$
$$T_2\to T_3$$	$$1$$	$$0$$	$$0$$
$$T_3\to T_4$$	$$1$$	$$1$$	$$1$$

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 61

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 61

Score

-

Rank

-

SHARING IS CARING

Question 1

Metallic conductor

Semi-conductor

Both $$(a)$$ and $$(b)$$

None of these

Solution

Question 2

The carry negative charge

They are light

They mutually collides less

They require low energy to continue their motion

Solution

Question 3

makes logical decisions.

allows electron flow only in one direction.

works using binary algebra.

alternates between $$0$$ and $$1$$ value.

Solution

Question 4

$$NAND$$

$$XOR$$

$$OR$$

$$None\ of\ these$$

Solution

Question 5

An $$AND$$ gate

An $$OR$$ gate

An $$NAND$$ gate

An $$NOT$$ gate

Solution

Question 6

NOT gate

OR gate

AND gate

NOR gate

Solution

Question 7

$$5\ mA$$

$$1\ mA$$

$$15\ mA$$

$$25\ mA$$

Solution

Question 8

XOR gate

NOR gate

AND gate

OR gate

Solution

Question 9

OR gate

AND gate

NAND gate

NOR gate

Solution

Question 10

each of them increases

each of them decreases

copper increases and germanium decreases

copper decreases and germanium increases.

Solution

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