Assessment Grade 11

What is the base of the binary system?

• 2
• 8
• 10
• 16

Answer explanation

Binary uses base 2.

Which number system uses digits 0–9 only?

• Binary
• Octal
• Denary
• Hexadecimal

Answer explanation

Denary is base 10.

How many symbols are used in hexadecimal?

• 8
• 10
• 12
• 16

Answer explanation

Hexadecimal uses 0–9 and A–F.

What is the hexadecimal equivalent of decimal 15?

• F
• E
• D
• C

Answer explanation

Decimal 15 = F in hex.

What is ASCII primarily used for?

• Storing images
• Representing text
• Storing videos
• Representing sound

Answer explanation

ASCII represents text using numeric codes.

How many bits are in standard ASCII?

• 7
• 8
• 16
• 32

Answer explanation

ASCII uses 7 bits.

Which encoding supports characters from most languages?

• ASCII
• Denary
• Hexadecimal
• Unicode

Answer explanation

Unicode supports global characters.

Which of these is NOT a valid binary number?

• 1010
• 1111
• 2021
• 1

Answer explanation

Binary digits can only be 0 or 1.

Convert binary 1010 to decimal.

• 8
• 9
• 10
• 11

Answer explanation

1010₂ = 10₁₀.

In one’s complement, how is a negative number formed?

• Flip all bits
• Add 1
• Subtract 1
• Shift left

Answer explanation

One’s complement = invert all bits.