1 $Which of the following represents the decimal number $25$ in binary?$

A.

B.

C.

D.

2 $Convert the hexadecimal number to its decimal equivalent.$

A.

$28$

B.

$30$

C.

$31$

D.

$29$

3 $What is the decimal value of the binary number ?$

A.

$5.35$

B.

$5.75$

C.

$5.25$

D.

$5.50$

4 $Which of the following is an unweighted code?$

A.

Excess-3 Code

B.

2421 Code

C.

BCD Code

D.

8421 Code

5 $Convert the binary number to Gray code.$

A.

$1011$

B.

$1100$

C.

$1010$

D.

$1110$

6 $The Gray code $1011$ represents which binary number?$

A.

B.

C.

D.

7 $What is the BCD (8421) representation of decimal number $12$?$

A.

$00100001$

B.

$00010010$

C.

$1100$

D.

$00001100$

8 $What is the Excess-3 code for the decimal number $6$?$

A.

$1001$

B.

$1000$

C.

$1100$

D.

$0110$

9 $The 2's complement of the binary number $10110$ is:$

A.

$01011$

B.

$01010$

C.

$01001$

D.

$10111$

10 $In 8-bit 2's complement representation, what is the range of integers that can be represented?$

A.

-128 to +127

B.

-256 to +255

C.

-127 to +128

D.

0 to 255

11 $Perform the subtraction using 2's complement method.$

A.

B.

C.

D.

12 $Which logic gate is known as the 'Universal Gate'?$

A.

XOR

B.

AND

C.

NAND

D.

OR

13 $The output of an XOR gate is HIGH only when:$

A.

Both inputs are LOW

B.

The inputs are the same

C.

The inputs are different

D.

Both inputs are HIGH

14 $Which boolean law states that ?$

A.

Absorption Law

B.

Distributive Law

C.

De Morgan's Law

D.

Redundancy Law

15 $According to De Morgan's first theorem, is equal to:$

A.

B.

C.

D.

16 $A 4-variable K-Map contains how many cells?$

A.

8

B.

12

C.

16

D.

32

17 $In a K-Map, grouping 4 adjacent $1$s (a quad) eliminates how many variables from the term?$

A.

2

B.

3

C.

0

D.

1

18 $The canonical sum of products (SOP) form consists of terms called:$

A.

Midterms

B.

Sumterms

C.

Minterms

D.

Maxterms

19 $Convert the octal number to binary.$

A.

B.

C.

D.

20 $What is the 9's complement of the decimal number $27$?$

A.

$73$

B.

$28$

C.

$82$

D.

$72$

21 $The boolean expression simplifies to:$

A.

$1$

B.

$0$

C.

D.

22 $Which of the following codes is known as a self-complementing code?$

A.

Octal

B.

Excess-3

C.

Gray Code

D.

8421 BCD

23 $The simplified boolean expression for the K-Map grouping involving corners of a 4-variable map ($0000, 0010, 1000, 1010$) is:$

A.

B.

C.

D.

24 $The symbol represents which form?$

A.

Standard POS

B.

Canonical POS

C.

Simplified SOP

D.

Canonical SOP

25 $In boolean algebra,$

A.

B.

C.

D.

$1$

26 $Which gate is equivalent to an AND gate followed by a NOT gate?$

A.

NOR

B.

NAND

C.

XOR

D.

XNOR

27 $What is the result of adding binary numbers ?$

A.

$10100$

B.

$11100$

C.

$11000$

D.

$10010$

28 $A digital circuit that produces a logic $1$ output when the input number of $1$s is odd is:$

A.

OR gate

B.

XOR gate

C.

AND gate

D.

XNOR gate

29 $If and, what is the value of ?$

A.

High Impedance

B.

$0$

C.

Indeterminate

D.

$1$

30 $The dual of the boolean expression is:$

A.

B.

C.

D.

31 $In a 3-variable K-map, the cells and are considered:$

A.

Adjacent

B.

Diagonal

C.

Opposite

D.

Isolated

32 $Which of the following is equivalent to the Boolean function ?$

A.

B.

C.

D.

33 $Convert the binary fraction to decimal.$

A.

$0.625$

B.

$0.725$

C.

$0.500$

D.

$0.375$

34 $What is the radix of the octal number system?$

A.

2

B.

16

C.

10

D.

8

35 $The boolean expression is equivalent to:$

A.

B.

C.

D.

36 $To perform binary subtraction using 1's complement:$

A.

Add to 1's complement of . If carry generated, ignore it.

B.

Add to 1's complement of . If carry generated, add 1 to sum.

C.

Add to .

D.

Subtract directly.

37 $What is the minimum number of NAND gates required to implement an OR gate?$

A.

3

B.

2

C.

4

D.

1

38 $In K-Map simplification, 'Don't Care' conditions are represented by:$

A.

1

B.

Z

C.

X

D.

0

39 $The Gray code is often used in:$

A.

Error correction

B.

Shaft position encoders

C.

Floating point operations

D.

Arithmetic operations

40 $Which of the following corresponds to the Logic equation ?$

A.

NAND

B.

XOR

C.

XNOR

D.

NOR

41 $What is the 1's complement of $100100$?$

A.

$011010$

B.

$100101$

C.

$011100$

D.

$011011$

42 $Convert decimal $13$ to Excess-3 code.$

A.

$1101$

B.

$01000110$

C.

$10000$

D.

$0100$

43 $The distributive law applies to:$

A.

Only boolean algebra

B.

Both boolean and ordinary algebra

C.

Neither

D.

Only ordinary algebra

44 $If a 3-input NAND gate has inputs, the output is:$

A.

Undefined

B.

1

C.

High Impedance

D.

0

45 $The standard POS form of the expression corresponds to:$

A.

Product of Maxterms

B.

Product of Minterms

C.

Sum of Maxterms

D.

Sum of Minterms

46 $The binary code for Hexadecimal is:$

A.

$1101$

B.

$1011$

C.

$1010$

D.

$1100$

47 $Which theorem allows moving a bubble from the output of an AND gate to the inputs, changing the gate to OR?$

A.

Superposition Theorem

B.

De Morgan's Theorem

C.

Duality Theorem

D.

Consensus Theorem

48 $Overflow in 2's complement addition occurs when:$

A.

Always when carry out is 1

B.

Adding a positive and a negative number

C.

Carry out occurs from MSB

D.

Adding two numbers of same sign yields a result of opposite sign

49 $In a 4-variable K-Map, how are the rows and columns labeled?$

A.

Decimal Order

B.

Gray Code ($00, 01, 11, 10$)

C.

Randomly

D.

Binary Sequence ($00, 01, 10, 11$)

50 $The value of in boolean algebra is:$

A.

B.

$1$

C.

D.

Unit 3 - Practice Quiz