Computer Y9 Level 8

Which of the following best explains why computers use binary to represent data?

• Binary is the only system that humans understand

• It reduces power consumption in processors

• It is simple to implement electronically using two states

• Binary can store images better than text

Which statement about character sets is MOST accurate?

• ASCII can represent all known languages

• Unicode is backward compatible with ASCII

• Extended ASCII uses 8 bits and supports all emojis

• ASCII and Unicode are used only for programming languages

What is the primary reason for using hexadecimal in computing?

• It is more accurate than binary

• It simplifies binary representation into shorter forms

• It reduces memory size of a file

• It allows for faster arithmetic

Which of these values is equivalent to the binary number 101101 in decimal?

• 45

• 43

• 47

• 41

Which of the following statements about sound digitisation is FALSE?

• Sampling rate determines how often the sound is recorded

• Sample resolution affects the precision of recorded values

• Increasing bit depth always reduces file size

• Sound is converted from analogue to digital via sampling

A key difference between bitmap and vector images is:

• Bitmaps use coordinates, vectors use pixels

• Vectors scale without losing quality, unlike bitmaps

• Bitmaps are used in fonts, vectors in photographs

• Vector files are larger than bitmap files

Which one of the following would likely result in the LARGEST file size for a sound file?

• Low sample rate, low bit depth

• High sample rate, high bit depth

• High sample rate, low bit depth

• Low sample rate, high bit depth

Why is metadata necessary in image files?

• To compress the image using algorithms

• To provide information such as resolution and colour depth

• To increase file security

• To allow colour changes in binary

Which of the following best describes the role of sampling in sound recording?

• It converts digital data to binary

• It measures the height of a wave at regular intervals

• It compresses audio for storage

• It adds effects to audio

What happens when you increase the resolution of a bitmap image?

• The number of colours increases

• The size of the file decreases

• The image becomes more pixelated

• The image quality and file size increase