Edexcel GCSE Computer Science Topic 3a

Convert 128 to binary

• 10000000
• 01111110
• 10000001
• 11001100

Convert 11111111 to decimal

• 255
• 245
• 235
• 225

What are the only two numbers you can use in binary?

• 0 and 1
• 1 and 2
• 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• 1, 2, 4, 8, 16

What are the disadvantages of using Sign and Magnitude to represent Negative Binary Numbers? (Select Two)

• It doesn't represent negative numbers accurately

• It takes up an entire digit to represent whether the number is -negative or + positive

• There is a possibility of having two 0's

• It takes longer for the computer to identify a negative number in two's complement

In a binary number, the bit on the very left is called:

• Most significant bit
• Least significant bit
• Operand
• Leftmost parity field

When a binary number's rightmost bit is a one this means:

• it represents an odd number
• it represents an even number
• this byte is corrupted
• none of the above

Out of these numbers: 1100 0110, 0111 1111, 0001 1111, 1010 1010, which one is the largest?

• 1100 0110
• 0111 1111
• 0001 1111�
• 1010 1010

What is the effect of applying a binary left shift 1 on a binary number?

• Double the number

• Halve the number

• Decreases the number by 2

• Increases the number by 2

What is the effect of applying a binary right shift 2 on a binary number?

• Multiply by 4

• Divide by 4

• Decreases the number by 4

• Increases the number by 4

Convert the hexadecimal number C9 to binary

• 1100 1001
• 1100 1000
• 1100 1010
• 1100 0101