AQA A Level Computer Science 7517 - end of year 1 revision

-3 is a natural number?

• True

• False

3.14 belongs to which set of numbers?

• Natural numbers

• Integers

• Rational numbers

• Irrational numbers

The concept of ordering objects e.g. 1st, 5th etc uses which number set?

• Integer

• Ordinal

• Rational

• Natural

1 0 0 0 0 0 0 1 (binary) has what equivalent in hexadecimal?

• 8 1

• A B

• 129

• 1 1

With n different bits, we can have how many different values?

• 2ⁿ

• 2^n-1

• 255

• 256

A kibibyte is

• 1000 bytes

• 1024 bytes

• 1048576 bytes

• 4 bits

In unsigned binary, the maximum value for n bits is

• 2ⁿ

• 2^n-1

• 255

• 256

1 0 1 0 . 1 in unsigned binary has what equivalent in denary?

• 10.25

• 12.0

• 10.1

• 10.5

To allow for enough characters to include foreign characters and symbols such as Σ, the character set used is

• extended ASCII

• Unicode

• ASCII

• Greek

If a number checking system is using odd parity, the 7-bit binary number 0 1 0 0 1 0 0 would have which digit added as a LSB?

• 1

• 0