Understanding Data Representation Concepts

What is the primary difference between ASCII and Unicode character sets?

• ASCII uses 8 bits per character, while Unicode uses 16 bits per character.

• ASCII can represent 128 characters, while Unicode can represent over 1 million characters.

• ASCII is used for text, while Unicode is used for images.

• ASCII is a subset of Unicode.

Which of the following is a data type used to store decimal numbers in programming?

• Integer

• Boolean

• Float

• Character

What is the hexadecimal representation of the binary number 1010?

• 8

• 9

• A

• B

In two's complement representation, what is the binary representation of -5 using 4 bits?

• 1011

• 1101

• 1110

• 1010

Which of the following is a bitwise operation?

• Addition

• Subtraction

• AND

• Division

What is the purpose of a bit mask in programming?

• To store large amounts of data

• To perform arithmetic operations

• To isolate or manipulate specific bits within a byte

• To convert data types

How is the number -7 represented in sign and magnitude using 4 bits?

• 1001

• 1111

• 0111

• 1011

What is the normalised form of the floating-point number 0.00123?

Which of the following is NOT a valid data type in most programming languages?

• Integer

• String

• Character

• Colour

What is the binary representation of the decimal number -3 in two's complement using 4 bits?

• 1101

• 1110

• 1011

• 1001