Computer Science Quiz

What is the technique for calculating the size (in bytes) of a sound file? (Mr Kiers)

• Multiply the sample rate by bit depth, divide by channels

• Multiply sample rate × bit depth × number of channels × length in seconds

• Add sample rate and bit depth, then multiply by channels

• Multiply sample rate by number of channels, ignore bit depth

What is the technique for calculating the size (in bytes) of a bitmap image? (Mr Kiers)

• Resolution × colour depth ÷ 8

• Resolution ÷ colour depth × 8

• Height × width × colour depth ÷ 8

• Height + width × colour depth ÷ 8

Explain what Hertz means. (Mr Kiers)

• The number of bits per second

• The number of cycles per second

• The amount of memory per second

• The number of colours per pixel

Why is bit depth important when calculating the size of an image? (Mr Kiers)

• It controls the resolution of the image

• It defines how many colours each pixel can store

• It changes the sampling rate of the image

• It limits the file’s compression ratio

What is a character set and why is it important in computing? (Mr Kiers)

• A collection of fonts, important for designing websites

• A group of binary codes representing text, needed for communication between computers

• A set of symbols on a keyboard, important for typing speed

• A programming library, important for running code

Convert 10110110 into hexadecimal and then into denary. (Dita)

• B6 (182)

• A7 (167)

• B6 (176)

• C5 (197)

What is the difference between an analogue and a digital signal? (Dita)

• Analogue is discrete; digital is continuous

• Analogue is continuous; digital is discrete

• Both are continuous signals

• Both are discrete signals

Explain what’s in Extended ASCII. (Dita)

• 128 characters including control codes

• 256 characters including extra symbols and foreign letters

• 64 characters for English text only

• Over 1 million characters covering all scripts

What is an IP Address, and what is the difference between IPv4 and IPv6 Addresses? (Krish)

• Identifies a website; IPv4 has 8 bits, IPv6 has 16 bits

• Identifies a device; IPv4 uses 32 bits, IPv6 uses 128 bits

• Identifies a file; IPv4 is binary, IPv6 is hexadecimal

• Identifies a port; IPv4 is old, IPv6 is encrypted

How do you calculate the file size of an audio file? (Krish)

• Sample rate × bit depth × channels × time

• Resolution × bit depth × channels × time

• Sample rate ÷ bit depth × channels × time

• Sample rate × channels ÷ bit depth × time