CAO2

Question 1

What is the smallest possible addressable unit of computer storage?

A) Bit
B) Byte
C) Word
D) Nibble

Answer 1

Byte

Question 2

Which term describes a group of bits that a computer processes as a single unit?

A) Bit
B) Byte
C) Word
D) Nibble

Answer 2

Word

Question 3

What is the base of the binary number system?

A) 2
B) 8
C) 10
D) 16

Answer 3

2

Question 4

Which of the following is the hexadecimal representation of the decimal number 26?

A) 1A
B) 1B
C) 2A
D) 2B

Answer 4

1A

Question 5

What is the binary representation of the decimal number 25?

A) 11001
B) 10110
C) 10011
D) 11100

Answer 5

11001

Question 6

To convert a decimal number to binary, you:

A) Multiply by 2 and keep the remainders
B) Divide by 2 and keep the remainders
C) Multiply by 10 and subtract the digits
D) Divide by 10 and keep the remainders

Answer 6

Divide by 2 and keep the remainders

Question 7

In an 8-bit signed magnitude representation, the binary form of -3 is:

A) 11111100
B) 10000011
C) 00000011
D) 11111111

Answer 7

10000011

Question 8

What is the main advantage of using two’s complement representation for signed integers?

A) It allows two representations for zero.
B) It simplifies arithmetic operations.
C) It makes binary numbers easier to read.
D) It is faster than floating-point representation.

Answer 8

It simplifies arithmetic operations.

Question 9

Which field in a floating-point number represents the precision of the value?

A) Sign field
B) Exponent field
C) Significand field
D) None of the above

Answer 9

Significand field

Question 10

In the IEEE-754 single-precision standard, the exponent field is biased by:

A) 127
B) 1023
C) 128
D) 256

Answer 10

127

Question 11

The ASCII code is based on which communication code system?

A) Telex
B) Morse code
C) Binary-Coded Decimal (BCD)
D) Unicode

Answer 11

Telex

Question 12

Which character encoding system allows representation of all languages worldwide?

A) ASCII
B) EBCDIC
C) Unicode
D) BCD

Answer 12

Unicode

Question 13

What type of error detection method is often used in barcodes and ISBNs?

A) CRC
B) Check digits
C) Hamming codes
D) Unicode

Answer 13

Check digits

Question 14

Which error detection technique involves dividing a block of data by a fixed divisor and appending the remainder to the message?

A) Parity checking
B) Check digits
C) Cyclic redundancy checking (CRC)
D) Hamming code

Answer 14

Cyclic redundancy checking (CRC)

Question 15

In Hamming code error correction, the Hamming distance must be at least:

A) k + 1 to detect k errors
B) 2k + 1 to correct k errors
C) k to correct k errors
D) 1 to detect all errors

Answer 15

2k + 1 to correct k errors

Question 16

A bit can represent:

A) 0 or 1
B) On or Off
C) High or Low voltage
D) All of the above

Answer 16

All of the above

Question 17

A nibble is equivalent to:

A) 2 bits
B) 4 bits
C) 8 bits
D) 16 bits

Answer 17

4 bits

Question 18

Which base system is most commonly used as shorthand for binary values, allowing grouping of bits?

A) Decimal
B) Octal
C) Hexadecimal
D) Ternary

Answer 18

Hexadecimal

Question 19

In a one’s complement representation, the negative of the binary number
00000011
00000011 is:

A)

11111100
B)

10000011
C)

11111101
D)

11111110

Answer 19

11111100

Question 20

Which representation system only allows one unique form of zero?

A) Signed magnitude
B) One’s complement
C) Two’s complement
D) Decimal

Answer 20

Two’s complement

Question 21

In two’s complement representation, to get the negative form of a binary number, you:

A) Flip all bits
B) Flip all bits and add 1
C) Add 2
D) None of the above

Answer 21

Flip all bits and add 1

Question 22

What does the most significant bit in a signed integer represent?

A) The parity bit
B) The number’s magnitude
C) The sign of the number
D) The exponent value

Answer 22

The sign of the number

Question 23

In an 8-bit two’s complement system, what is the largest positive number that can be represented?

A) 127
B) 128
C) 255
D) 256

Answer 23

127

Question 24

In IEEE-754 floating-point representation, what is indicated when all bits in the exponent are set to 1 and the significand is zero?

A) Zero
B) NaN
C) Positive or negative infinity
D) Underflow

Answer 24

Positive or negative infinity

Question 25

Which of the following describes the precision of a floating-point number? A) The number of bits in the exponent field B) The difference between the largest and smallest values representable C) The number of significant digits it can accurately represent D) The ability to represent negative values

Answer 25

The number of significant digits it can accurately represent

Question 26

In floating-point representation, the term biased exponent refers to: A) Adding a fixed value to the actual exponent B) Subtracting a fixed value from the exponent C) Setting the exponent to a fixed minimum D) Multiplying the exponent by a constant

Answer 26

Adding a fixed value to the actual exponent

Question 27

ASCII uses how many bits to represent each character? A) 7 bits B) 8 bits C) 16 bits D) 32 bits

Answer 27

7 bits

Question 28

Which character encoding system provides support for a wide range of global languages? A) ASCII B) BCD C) EBCDIC D) Unicode

Answer 28

Unicode

Question 29

The EBCDIC code was developed primarily for use by: A) Apple computers B) IBM mainframes C) UNIX systems D) Microsoft computers

Answer 29

IBM mainframes

Question 30

Which type of code is specifically designed to detect and correct errors? A) CRC B) Parity code C) Check digits D) Hamming code

Answer 30

Hamming code

Question 31

What is the minimum Hamming distance required to correct up to 2 single-bit errors? A) 2 B) 3 C) 4 D) 5

Answer 31

4

Question 32

What is modulo-2 arithmetic primarily used for in error detection? A) Calculating parity bits B) Adding check digits C) Detecting carry bits D) Performing binary subtraction for CRC

Answer 32

Performing binary subtraction for CRC

Question 33

Which numbering system is characterized by base 2? A) Decimal B) Binary C) Octal D) Hexadecimal

Answer 33

Binary

Question 34

In a binary number, each digit represents a power of which number? A) 10 B) 8 C) 2 D) 16

Answer 34

2

Question 35

Which hexadecimal number represents the binary number 1010? A) A B) B C) C D) F

Answer 35

A

Question 36

Which of the following is a common use of binary arithmetic in computers? A) Representing textual data B) Performing mathematical calculations C) Storing visual images D) Organizing file systems

Answer 36

Performing mathematical calculations

Question 37

What is the hexadecimal equivalent of the binary number 000101101010? A) 1AA B) 16A C) 1A9 D) 2AB

Answer 37

16A

Question 38

In binary addition, what is the result of 1 + 1? A) 0, with a carry of 0 B) 1, with a carry of 1 C) 0, with a carry of 1 D) 1, with a carry of 0

Answer 38

0, with a carry of 1

Question 39

In signed binary representation, how is a negative integer represented? A) By using two’s complement B) By using signed magnitude C) By using one’s complement D) All of the above

Answer 39

All of the above

Question 40

To convert a decimal fraction to binary, which method is used? A) Division by the base B) Multiplying by the radix C) Subtracting from 1 D) Adding each digit

Answer 40

Multiplying by the radix

Question 41

What is the one’s complement of the binary number 00000101? A) 11111011 B) 11111110 C) 11111010 D) 11111101

Answer 41

11111010

Question 42

What is the primary reason for using hexadecimal representation in computing? A) It simplifies binary to decimal conversion B) It makes binary data shorter and more readable C) It allows for easier arithmetic calculations D) It is more accurate than binary representation

Answer 42

It makes binary data shorter and more readable

Question 43

What is the two’s complement of the binary number 00000101? A) 11111011 B) 11111010 C) 11111101 D) 11111111

Answer 43

11111011

Question 44

Which of these is NOT a characteristic of the binary numbering system? A) Base 2 B) Digits range from 0 to 1 C) Commonly used in computers D) Uses digits 0 to 9

Answer 44

Uses digits 0 to 9

Question 45

What does each hexadecimal digit correspond to in binary? A) 2 bits B) 3 bits C) 4 bits D) 5 bits

Answer 45

4 bits

Question 46

Which base is used in the decimal numbering system? A) 2 B) 8 C) 10 D) 16

Answer 46

10

Question 47

In hexadecimal addition, if the sum of two digits is 21, what is the remainder? A) 1 B) 5 C) 7 D) 9

Answer 47

5

Question 48

How do you represent the decimal number 15 in hexadecimal? A) E B) F C) D D) 10

Answer 48

F

Question 49

What is the result of 7 + 6 in hexadecimal? A) E B) C C) D D) F

Answer 49

D

Question 50

In binary, what is the outcome of subtracting 1 from 0? A) 0 B) 1 C) 0 with a borrow of 1 D) 1 with a carry of 1

Answer 50

0 with a borrow of 1

Question 51

Which of these is a correct binary subtraction rule? A) 1 - 1 = 1 B) 0 - 0 = 1 C) 1 - 0 = 1 D) 0 - 1 = 1 with a carry of 1

Answer 51

1 - 0 = 1

Question 52

Which of these is the correct binary equivalent of the decimal number 10? A) 1000 B) 1010 C) 1001 D) 1100

Answer 52

1010

Question 53

In signed binary numbers, the most significant bit represents: A) The value of the number B) The base of the number C) The sign of the number D) The length of the number

Answer 53

The sign of the number

Question 54

In binary addition, what is the result of adding 111 and 101? A) 1100 B) 1011 C) 1000 D) 1101

Answer 54

1100

Question 55

What is the binary equivalent of the hexadecimal number A? A) 1000 B) 1010 C) 1101 D) 1110

Answer 55

1010

Question 56

To find the one’s complement of a binary number, you: A) Add 1 to the number B) Replace each 0 with 1 and each 1 with 0 C) Subtract 1 from the number D) Shift the bits to the left

Answer 56

Replace each 0 with 1 and each 1 with 0

Question 57

In two’s complement representation, to find the negative of a binary number, you: A) Add 1 to its one’s complement B) Subtract 1 from its one’s complement C) Add the number to itself D) Reverse the bits

Answer 57

Add 1 to its one’s complement

Question 58

What is the decimal equivalent of the hexadecimal number 3BA4? A) 1,538 B) 2,780 C) 15,268 D) 20,442

Answer 58

15,268

Question 59

Which of these numbers represents 101 in binary format? A) 4 B) 3 C) 5 D) 6

Answer 59

5

Question 60

What is the hexadecimal equivalent of the decimal number 255? A) EE B) FF C) CC D) DD

Answer 60

FF

Question 61

The hexadecimal system is based on which number? A) 8 B) 10 C) 12 D) 16

Answer 61

16