Module 3 Study Guide - Information Technologies

People use signals to communicate.

• True

• False

An analog signal changes between two values.

• True

• False

Computers use _____ signals to store, send, and receive information.

Which of these uses digital signals to store, send, or receive information?

• a film camera

• a CD player

• a tape recorder

• a vinyl record

Sign language and written language are examples of signals used to communicate.

• True

• False

Before a signal is sent, it must be decoded.

• True

• False

Electronic signals can travel very long distances in _____ fibers, due to total internal reflection.

What do all signals that are used to communicate have in common?

• They all involve light waves.

• They all send information.

• They all use printed words.

• They all use a series of sounds.

What is a disadvantage of using radio waves to transmit information?

• They do not permanently move matter.

• They can travel over long distances.

• They can be varied to hold information.

• They lose energy as they travel through mediums.

How does noise affect a signal?

• It causes the signal to deteriorate.

• It amplifies the signal.

• It allows the signal to travel further.

• It changes the signal as it moves from one medium to another.