8th Grade Quarter 3 Study Guide

True or False: An analog signal is one that changes continuously

• True
• False

True or False: Radio waves are an example of a digital signal.

• True
• False

True or False: Digital signals are more affected by noise than analog signals.

• True
• False

True or False: The more pixels a digital image consists of, the clearer the image.

• True
• False

Computers use a series of __________ numbers to encode information.

• even
• odd
• binary
• random

Which is the best model of an analog signal?

• a smooth wave
• a light switch going on and of
• a series of 1's and 0's
• a series of pulses

Which best compares the reliability of analog signals and digital signals?

• Only analog signals are reliable.
• Digital signals are more reliable than analog signals
• Analog signals are more reliable than digital signals.
• Both types of signals are equally reliable.

For which type(s) of signals does noise alter the original information?

• analog only
• digital only
• both analog and digital
• neither analog and digital

Which best describes binary numbers?

• a continuously changing wave
• a set of two discrete values
• a large array of values
• a set of four or five numbers

Oliver knows there are different types of waveforms, both analog and digital. He analyzes the wave below to determine which type of information is stored in the wave. Is this most likely an analog or digital signal?

• digital because the amplitude is only ever a certain set of values
• digital because the amplitude contains all values within a range
• analog because the amplitude is only ever a certain set of values
• analog because the amplitude contains all values within a range