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DF MCQ By Magic

Total questions: 80

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

Convert (0.35)10 to equivalent hexadecimal number.

a)

(0.599)16

b)

(0.6399)16

c)

(0.558)16

d)

(0.99)16

2.

State Demorgan’s Theorem.

a)

(AB)' = A + B

(A + B)' = AB

b)

(AB) = A' + B'

(A + B) = A'B'

c)

(AB)' = A' + B'

(A + B)' = A'B'

d)

AB = A + B

A + B = AB

3.

A.1=

a)

1

b)

A

c)

0

d)

A'

4.

A.A'

a)

A.A

b)

A

c)

0

d)

1

5.

(29AB)16=

a)

(101001011)2

(24765)8

b)

(10100110101011)2

(24653)8

c)

(110000110101011)2

(24658)8

d)

(1010101011)2

(2489)8

6.

Simplify the following Boolean Expression to a minimum number of literals.

(BC′+A′D)(AB′+CD′)

a)

1

b)

0

c)

BC

d)

ABC

7.

The following hexadecimal number (1E.43)16 is equivalent to

a)

(36.506)8

b)

(36.206)8

c)

(35.506)8

d)

(35.206)8

8.

How many entries will be in the truth table of a 4-input NAND gate?

a)

6

b)

8

c)

32

d)

16

9.

How many bits are needed to store one BCD digit?

a)

2 bits

b)

3 bits

c)

4 bits

d)

1 bits

10.

Convert (312)8 into decimal

a)

(201)10

b)

(202)10

c)

(203)10

d)

(204)10

11.

In Digital electronics (Boolean algebra), the OR operation is performed by which of the given properties

a)

Distributive properties

b)

Commutative properties

c)

Associative properties

d)

All of these

12.

DeMorgan's Law states that

a)

(A+B)' = A'*B

b)

(AB)' = A' + B'

c)

(AB)' = A' + B

d)

(AB)' = A + B

13.

Which of the given input combination is correct? if the output of an XNOR gate is 1

a)

A = 0, B' = 1

b)

A = 1, B = 1

c)

A = 0, B = 1

d)

A = 0, B = 0

14.

Complement of the expression A’B + CD’ is

a)

(A’ + B)(C’ + D)

b)

(A + B’)(C’ + D)

c)

(A’ + B)(C’ + D)

d)

(A + B’)(C + D’)

15.

How many AND gates are required to realize Y = CD + EF + G?

a)

4

b)

5

c)

3

d)

2

16.

The AND function can be used to ___________ and the OR function can be used to _____________

a)

Enable, disable

b)

Disable, enable

c)

Synchronize, energize

d)

Detect, invert

17.

In the expression A + BC, the total number of minterms will be ………

a)

2

b)

3

c)

5

d)

4

18.

Which number system has a base 16

a)

Hexadecimal

b)

Octal

c)

Binary

d)

Decimal

19.

The conversion of decimal number (37.8125) to Binary is

a)

100101.1101

b)

11010.0101

c)

101010.1010

d)

010101.0101

20.

Find Octal number equivalent of the Decimal number (214.640625)

a)

326.51

b)

320.15

c)

326.10

d)

326.25

21.

Convert the decimal number 3509 to Hexadecimal

a)

DB5

b)

BD5

c)

5BD

d)

ABC

22.

110001.101 is equal to .......... in Decimal

a)

49.625

b)

50.625

c)

94.625

d)

49.865

23.

101.110.110.11 is equivalent to ------------ in Octal system

a)

56.66

b)

66.66

c)

65.66

d)

66.56

24.

The Hexadecimal equivalent of 1101100010011011 is

a)

D89B

b)

BD98

c)

89BD

d)

DB89

25.

Binary equivalent of the Octal number 725.63 is

a)

111010101.110011

b)

10101010.101010

c)

01010101.0101

d)

None

26.

Find Hexadecimal equivalent of the Octal number 7689.35

a)

ABCD.23

b)

DCBA.EF

c)

ABCD.EF

d)

None

27.

Find Hexadecimal equivalent of the Octal number 7689.35

a)

ABCD.23

b)

DCBA.EF

c)

ABCD.EF

d)

None

28.

9B2.1A is equivent to ........... in Decimal

a)

2482.1015

b)

2345.1015

c)

2542.1015

d)

None

29.

ABCD.EF is equivalent to ............. in Binary

a)

1010101111001101.11101111

b)

ABCD.EF

c)

10101010101010.1010101010

d)

0101010101.01010101

30.

Add 1010 to 1111

a)

101001

b)

01010101

c)

0110101

d)

10101010

31.

1's Complement of 1000 is

a)

0111

b)

1000

c)

1010

d)

0101

32.

2's complement of 1000 is

a)

1000

b)

0111

c)

1010

d)

None

33.

Find the answer of (0101111 - 0101000)

a)

0000111

b)

1000101

c)

1000111

d)

None

34.

The term bit means

a)

a small amount of data

b)

a 1 or a 0

c)

binary digit

d)

both answers b and c

35.

The decimal equivalent of 1000 is

a)

2

b)

4

c)

6

d)

8

36.

The sum of 1111 + 1111 in binary equals

a)

0000

b)

2222

c)

11110

d)

11111

37.

The 2’s complement of 11001100 is

a)

00110011

b)

00110100

c)

00110101

d)

00110110

38.

The difference of 1000 - 100 equals

a)

100

b)

101

c)

110

d)

111

39.

The sign bit of a signed binary number is located where?

a)

right-most bit

b)

left-most bit

c)

right of the binary point

d)

left of the binary point

40.

The sign bit of a signed binary number is located where?

a)

right-most bit

b)

left-most bit

c)

right of the binary point

d)

left of the binary point

41.

Simplify the following Boolean Expression to a minimum number of literals.

(BC′+A′D)(AB′+CD′)

a)

1

b)

0

c)

BC

d)

ABC

42.

Define max term.

a)

A product term containing all the variables of the function in either complemented or

uncomplemented form is called a max term.

b)

A sum term containing all the variables of the function in either complemented or

uncomplemented form is called a max term.

c)

A sum term containing all the variables of the function is called a max term.

d)

A product term containing all the variables of the function is called a max term.

43.

(29AB)16=

a)

(101001011)2

(24765)8

b)

(10100110101011)2

(24653)8

c)

(110000110101011)2

(24658)8

d)

(1010101011)2

(2489)8

44.

Distributive Law is

a)

a+(b+c) = a.b + a.c

a+b.c = (a+b)+(a+c)

b)

a.(b+c) = a.b + a.c

a+b.c = (a+b).(a+c)

c)

a.(b+c) = a.b + a.c

a+b+c = (a+b).(a+c)

d)

a.(b+c) = a.b.c+ a.c

a+b.c = (a+b).(a+c)

45.

Convert (0.35)10 to equivalent hexadecimal number.

a)

(0.599)16

b)

(0.6399)16

c)

(0.558)16

d)

(0.99)16

46.

The decimal equivalent of the octal number 523 is

a)

335

b)

533

c)

339

d)

393

47.

The base of octal number is

a)

2

b)

8

c)

10

d)

11

48.

The decimal equivalent of the number 101101.10 is

a)

40.75

b)

45.5

c)

44.5

d)

43.25

49.

The range of octal number is from......

a)

1 to 8

b)

0 to 7

c)

0 to 9

d)

none

50.

The number 15 is represented as ............in Hexadecimal.

a)

C

b)

E

c)

F

d)

D

51.

What is the decimal equivalent of the number 7CD.8

a)

1789.3

b)

1987.6

c)

1998.5

d)

1997.5

52.

The number 5A6D belongs to which category of number system

a)

Octal

b)

Hexadecimal

c)

Binary

d)

DEcimal

53.

Which bit has the highest weightage?

a)

MSB

b)

LSB

c)

Middle most bit

d)

none

54.

What is the radix of hexadecimal number?

a)

15

b)

10

c)

16

d)

2

55.

Convert the binary number 01011 into decimal

a)

10

b)

11

c)

13

d)

12

56.
What is the output of an OR gate if the inputs are 1 and 0?
a)
0
b)
1
c)
OFF
d)
2
57.
What kind of gate is this?
a)
NOR
b)
NAND
c)
OR
d)
XOR
58.

What will the circuit's output be?

a)

1

b)

0

59.

Which logic gate is this?

a)

AND

b)

OR

c)

XOR

d)

NOT

60.
What gate is this table for?
a)
AND
b)
OR
c)
NOT
d)
NOR
61.
What logic gate is this?
a)
AND
b)
OR 
c)
NOT
d)
TO
62.
The output of a ________ gate is only 1 when both inputs are 1.
a)
OR
b)
NOT
c)
NAND
d)
AND
63.
A logic state can only be….
a)
On or 1
b)
Off or 1
c)
1 or 0
d)
In and Out
64.
An OR gate has
a)
Two inputs and one output
b)
One input and one output
c)
One input and two outputs
d)
Two inputs and two outputs
65.
A NOT gate has…
a)
Two inputs and one output
b)
One input and one output
c)
One input and two outputs
d)
Two inputs and two outputs
66.
What is the output of an AND gate if the inputs are 1 and 0?
a)
ON
b)
2
c)
1
d)
0
67.

A function F(A, B, C) defined by three Boolean variables A, B and C when expressed as sum of products is given by

F=A'B'C'+A'BC'+AB'C'

The product of sums (POS) form of the function F is (GATE 2018)

a)

(A+B+C)(A+B'+C)(A'+B+C)(A+B'+C')

b)

(A+B+C')(A+B'+C')(A'+B'+C)+(A'+B'+C')

68.

How many AND gates are required to realize Y = CD + EF + G?

a)

4

b)

5

c)

3

d)

2

69.

State the name of this logic gate....

a)

AND

b)

NOT

c)

NOR

d)

OR

70.

Complete the truth table for the logic gate!

a)
b)
71.

What gate is this truth table for?

a)

AND

b)

NOT

c)

OR

d)

THE

72.

symbol for a NAND gate is....

a)
b)
c)
d)
73.

Which are the UNIVERSAL GATES?

a)

XOR Gate & NOT Gate

b)

AND Gate & OR Gate

c)

NAND Gate & NOR Gate

d)

All of the above

74.

The NOR Gate is OR Gate followed by ...............

a)

OR Gate

b)

NOT Gate

c)

AND Gate

d)

None of the above

75.

In the case of OR gate,no matter what the no. of inputs a

a)

1 at any input causes the output to be at logic 1

b)

1 at any input causes the output to be at logic 0

c)

0 any input causes the output to be at logic 0

d)

0 at any input causes the output to be at logic 1.

76.

NAND Gate is called a universal logic element, because

a)

It is used by everybody

b)

Any logic function can be realised by NAND Gate alone

c)

Many digital computers use NAND Gate

d)

All the minimisation techniques are applicable to optimum NAND Gate realisation

77.

Convert the Gray code 1010 to binary code.

a)

1111

b)

1100

c)

1101

d)

1001

78.

Convert the binary number 1101 to gray code.

a)

1001

b)

1111

c)

1011

d)

1100

79.

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

a)

Not Gate

b)

Nor Gate

c)

And Gate

d)

Or Gate

80.

For subtracting 1 from 0, we use to take a _______ from neighbouring bits.

a)

Carry

b)

Borrow

c)

Input

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