Semiconductor Electronics: Materials, Devices & Simple Circuits Test 7

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Semiconductor Electronics: Materials, Devices & Simple Circuits Test 7

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Weekly Quiz Competition

Question 1
1 / -0

The binary number system has a base of

A
8

B
2

C
10

D
16

Solution

Binary number system, in mathematics, positional numeral system employing 2 as the base and so requiring only two different symbols for its digits, 0 and 1, instead of the usual 10 different symbols needed in the decimal system.
Question 2
1 / -0

In the binary number 10010, the MSB is

A
100

B
0

C
1

D
10

Solution

1001=1x2³+0x2²+0x2¹+1x2⁰=9
For binary numbers, the digit at the extreme right is referred to as least significant bit (LSB) and the left- most digit is called the most significant bit (MSB). Hence in binary 10010, the most significant bit is 1.
Question 3
1 / -0

Which of the following is the universal gate?

A
OR gate

B
AND gate

C
NAND gate

D
NOT gate

Solution

A universal gate is a gate which can implement any Boolean function without need to use any other gate type. The NAND and NOR gates are universal gates. In practice, this is advantageous since NAND and NOR gates are economical and easier to fabricate and are the basic gates used in all IC digital logic families.
Question 4
1 / -0

The inputs of a NAND gate are connected together. The resultant circuit is

A
NOT gate

B
AND gate

C
OR gate

D
None of the above

Solution

The equation of NAND gate is
Y=Aˉ.Bˉ
When both the terminals are connected together.
A=B=A
Y=Aˉ.Aˉ=Aˉ.Aˉ=Aˉ
Which is nothing but the equation of NOT gate.
Y=Aˉ
Option A is the correct answer.
Question 5
1 / -0

The NOR gate is OR gate followed by

A
AND gate

B
OR gate

C
NOT gate

D
None of the above

Solution

An OR gate followed by a NOT gate in a cascade is called a NOR gate. In other words, the gate which provides a high output signal only when there are low signals on the inputs such type of gate is known as NOR gate.
Question 6
1 / -0

The truth table given below is for a gate with A and B as inputs and C as output. Which of the gates will obey this truth table?

A
OR

B
XOR

C
AND

D
NAND

Solution

We can observe from the table that Yˉ=A.B⇒Y=AB
So, the table represents a NAND gate.
Question 7
1 / -0

Which among the following gates has output = A . B ?

A
OR gate

B
NOT gate

C
AND gate

D
NAND gate

Solution

The logic or Boolean expression given for a digital logic AND gate is that for Logical Multiplication which is denoted by a single dot or full stop symbol, ( . ) giving us the Boolean expression of: A.B = Y.

Then we can define the operation of a digital 2-input logic AND gate as being:
“If both A and B are true, then Y is true”
Question 8
1 / -0

The output of a 2-input OR gate is zero only when its:

A
both inputs are 0

B
either input is 1

C
both inputs are 1

D
either input is zero

Solution

The truth table for 2-input OR gate is as shown in the figure. Thus, the output is zero only when both inputs are zero.
Question 9
1 / -0

If A = 1 and B = 0, what is the value of A.A+B?

A
A

B
A² + B

C
A.B

D
B

Solution

A=1 and B=0
A.A+B
=A2+B [De-Morgan’s theorem)
=1+0
=1
=A
Question 10
1 / -0

The binary number 10101 is equivalent to decimal number

A
21

B
13

C
43

D
51

Solution

10101 is the binary number to be converted to a decimal number.
To convert, multiply the numbers individually with 2n where n changes according to place value of the number.
(10101)₂= (2⁰× 1) + (0 × 2¹) + (1×2²) + (0×2³) + (1×2⁴)
= 1 + 0 + 4 + 0 + 16
= 21

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Semiconductor Electronics: Materials, Devices & Simple Circuits Test 7

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Semiconductor Electronics: Materials, Devices & Simple Circuits Test 7

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SHARING IS CARING

Question 1

8

2

10

16

Solution

Question 2

100

0

1

10

Solution

Question 3

OR gate

AND gate

NAND gate

NOT gate

Solution

Question 4

NOT gate

AND gate

OR gate

None of the above

Solution

Question 5

AND gate

OR gate

NOT gate

None of the above

Solution

Question 6

OR

XOR

AND

NAND

Solution

Question 7

OR gate

NOT gate

AND gate

NAND gate

Solution

Question 8

both inputs are 0

either input is 1

both inputs are 1

either input is zero

Solution

Question 9

A

A2 + B

A.B

B

Solution

Question 10

21

13

43

51

Solution

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A² + B