As CS Data representation and data types​ (Unit 1)

Which term represents a group of 8 bits?

• Byte

• Kilobyte

• Megabyte

• Terabyte

Answer explanation

A group of 8 bits is represented by the term "byte." It is the fundamental unit of storage in computer systems and is commonly used to represent characters, numbers, and other data.

What does a bit represent in the binary number system?

• On or Off signal

• Decimal digit

• Alphanumeric character

• Color value

Answer explanation

In the binary number system, a bit represents an electronic signal that can be either "on" or "off." These two states are commonly represented as 1 or 0, respectively, and form the foundation of digital data representation and processing.

What determines the size of a word in a CPU?

• The number of kilobytes

• The number of megabytes

• The number of bits it can manipulate at one time

• The number of bytes in a kilobyte

Answer explanation

The size of a word in a CPU is determined by the number of bits it can manipulate at one time. The word size determines the maximum amount of data that the CPU can process in a single operation, and it can vary depending on the architecture and design of the CPU. A larger word size generally allows for more efficient and faster processing of data.

What is the decimal equivalent of the binary number 1010?

• 2

• 5

• 10

• 15

Answer explanation

The binary number 1010 represents the decimal value 10. In binary, each digit represents a power of 2, so the calculation is as follows: 1 2^3 + 0 2^2 + 1 2^1 + 0 2^0 = 8 + 0 + 2 + 0 = 10.

What is the hexadecimal representation of the decimal number 27?

• 1B

• 21

• 2C

• 31

Answer explanation

The decimal number 27 can be represented as 1B in hexadecimal. In hexadecimal, the digits range from 0 to F, where A represents 10, B represents 11, and so on. To convert 27 to hexadecimal, divide it by 16: 27 / 16 = 1 remainder 11. The remainder 11 corresponds to the letter B, giving us the hexadecimal representation 1B.

What is the binary representation of the hexadecimal number 3D?

• 1101

• 0011

• 1010

• 1111

Answer explanation

The hexadecimal number 3D can be represented as 1101 in binary. Each hexadecimal digit corresponds to a group of 4 binary digits (bits). In this case, 3 is equivalent to 0011, and D is equivalent to 1101. Combining the two, we get the binary representation 1101.

Which character encoding standard uses a 7-bit binary encoding scheme?

• ASCII

• Unicode

• UTF-8

• UTF-16

Answer explanation

ASCII (American Standard Code for Information Interchange) is the character encoding standard that uses a 7-bit binary encoding scheme. It assigns a unique 7-bit binary code to represent each character, supporting basic Latin characters, numbers, punctuation marks, and control characters.

How many characters does Unicode support?

• 7

• 128

• 143,000

• Unlimited

Answer explanation

Unicode is a comprehensive character encoding standard that supports more than 143,000 characters from various scripts and languages worldwide. It aims to provide a unified representation for all writing systems, surpassing the limited character set of ASCII.

Which encoding schemes are used by Unicode?

• UTF-8, UTF-16, and UTF-32

• ASCII and UTF-8

• UTF-16 and UTF-32

• UTF-8 and UTF-32

Answer explanation

Unicode uses different encoding schemes to accommodate different storage needs. The commonly used encoding schemes in Unicode are UTF-8, UTF-16, and UTF-32. UTF-8 is a variable-length encoding scheme that uses 8-bit units, UTF-16 uses 16-bit units, and UTF-32 uses 32-bit units to represent characters.

Which data type represents a logical value that can be either true or false?

• Boolean

• Character

• String

• Integer

Answer explanation

The Boolean data type is named after George Boole and represents a logical value that can be either true or false. It is commonly used in programming for making decisions and evaluating conditions.