Cambridge AS Level Computer Science: Data Representation

Which of the following is the correct equivalent size of 1 kilobyte (1 KB) using denary prefixes?

• 1024 bytes

• 1000 bytes

• 1048 bytes

• 100 bytes

Which of the following is the binary representation of the decimal number 7?

• 0110

• 0111

• 1000

• 0101

Given the 8-bit binary number 01101001, what is the first step in converting it to denary?

• Add all the digits together

• Multiply each bit by its corresponding power of 2

• Convert it directly to hexadecimal

• Reverse the order of the bits

When converting the denary number 163 to hexadecimal, what is the first step?

• Multiply the number by 16

• Divide the denary value by 16 and record the whole times and the remainder

• Add 16 to the number

• Subtract 16 from the number

If you are given the BCD code 0100, what is the corresponding denary digit?

• 2

• 3

• 4

• 5

Why is Binary Coded Decimal (BCD) used in digital systems?

• To represent each denary digit with a unique 4-bit code

• To store large numbers efficiently

• To perform fast arithmetic operations

• To convert text to binary

How many bits are in a single BCD code?

• 2 bits

• 4 bits

• 6 bits

• 8 bits

If you have two bytes: 00010001 and 0101, what decimal values do they represent in BCD?

• 2, 5

• 1, 5

• 2, 1

• 0, 0

What is the main issue with one's complement representation of numbers?

• It can have two representations for 0 (positive and negative)

• It cannot represent negative numbers

• It is the same as two's complement

• It only works for even numbers

What is the two's complement representation of -72 in 8 bits?

• 10111000

• 01001000

• 11110000

• 00001111