Edexcel GCSE Computer Science Topic 2: Data

What is the maximum number of states that can be represented by a binary pattern of 8 bits?

• 128

• 256

• 1024

• 512

How do computers represent and manipulate signed integers using two's complement?

• Leave the binary representation unchanged

• Subtract 1 from the binary representation

• Add 1 to the binary representation

• Invert all the bits and add 1

What is the decimal equivalent of the 8-bit binary number 10101010?

• 42

• 85

• 170

• 240

What happens when two positive binary patterns are added together?

• Logical OR operation

• Arithmetic shift left

• Logical AND operation

• Arithmetic shift right

What is the concept of overflow in relation to the number of bits available to store a value?

• The value is exactly the same as the maximum representable value

• The value exceeds the maximum representable value

• The value is less than the minimum representable value

• The value is exactly the same as the minimum representable value

Why is hexadecimal notation used in computing?

• It is easier to convert to decimal

• It is easier to convert to binary

• It requires less memory space

• It is faster for computers to process

How are characters encoded using 7-bit ASCII?

• Using 8-bit representation

• Using 6-bit representation

• Using 5-bit representation

• Using 4-bit representation

How are bitmap images represented in binary in terms of resolution?

• By the sample rate

• By the number of pixels

• By the color depth

• By the bit depth

What is the need for data compression?

• To slow down data transmission

• To reduce the amount of space required to store data

• To increase data capacity requirements

• To increase file size

What is the unit of data storage that is equivalent to 1024 bytes?

• Tebibyte

• Mebibyte

• Kibibyte

• Gibibyte