BTEC Level 3 Computing Quiz: Data Representation

What is the binary representation of the decimal number 25?

• 11100

• 10011

• 11001

• 10101

Explain the difference between ASCII and Unicode.

• ASCII uses 7 bits to represent characters, while Unicode uses 16 bits.

• ASCII and Unicode are the same thing.

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

• ASCII uses 8 bits to represent characters, while Unicode uses 32 bits.

Convert the hexadecimal number 3A into its binary equivalent.

• 11001100

• 00111010

• 10101010

• 11110000

What is the purpose of using two's complement in binary representation?

• To only represent positive numbers in binary form

• To make the binary representation more colorful

• To confuse the computer system

• To represent both positive and negative numbers in binary form

Describe the process of converting a binary number to its hexadecimal equivalent.

• Add 4 to each bit of the binary number to get the hexadecimal equivalent

• Convert each bit of the binary number to its decimal equivalent and then to hexadecimal

• Multiply the binary number by 16 to get the hexadecimal equivalent

• Divide the binary number into groups of 4 bits, convert each group to its hexadecimal equivalent, and combine the results.

What is the significance of bit depth in digital image representation?

• It determines the brightness of the image

• It affects the resolution of the image

• It determines the number of colors or shades of gray that can be represented in an image.

• It determines the size of the image file

Explain the concept of data compression and its impact on data representation.

• Data compression reduces the size of data to save storage space and transmission time, allowing more data to be stored in the same amount of space and transmitted more quickly.

• Data compression has no impact on data representation

• Data compression slows down data transmission

• Data compression increases the size of data to save storage space and transmission time

Convert the binary number 1101011 into its octal equivalent.

• 101

• 100

• 110

• 153

Discuss the role of parity bits in error detection and correction in data representation.

• Parity bits are not effective in detecting errors

• Parity bits are only used in audio data representation

• Parity bits are used to encrypt data

• Parity bits are used to detect errors in data representation by adding an extra bit to each byte of data.

What are the advantages and disadvantages of using floating-point representation for numerical data?

• Advantages include flexibility and a wide range of values, while disadvantages include limited precision and potential rounding errors.

• Advantages include easy conversion to other data types and no impact on memory usage

• Disadvantages include limited range of values and inflexibility

• Advantages include high precision and no potential rounding errors