PS4-3 Review

What is the binary code for the number 5 according to the table?

• 0101

• 1010

• 0110

• 0100

According to the table, which number is represented by the binary code 0010?

• 1

• 2

• 3

• 4

What number is represented by the binary sequence 0010 1001 0001 0111?

• 2, 9, 1, 7

• 2, 8, 1, 6

• 3, 9, 2, 7

• 3, 8, 1, 6

There are many ways to communicate over a distance. Which uses vibrating air to send a message?

• blinking lights

• instant messaging

• talking

• telephone

A group of friends made a code that they could use to send secret messages. For their code, they replaced each letter with the next letter of the alphabet. B represented the letter A, C represented the letter B, and so on. Using this code, what word is shown by the code message EPHT?

• CATS

• DOGS

• FACE

• HAND

_____ can be used to transmit information.

• Heat

• Patterns

• Senses

• Digital

Which of the following was not used to transmit information using Morse Code?

• a telegraph

• a flashlight

• pencil and paper

• a sundial

Communication satellites use _____ sent by a transmitting station to transmit signals over long distances.

• microwaves

• polar waves

• light

• radio waves

Which system represents letters, digits, or other characters using 0's and 1's?

• binary code

• electromagnetic waves

• radio waves

• Morse code

Which of the following correctly represents how cell phones work?

• message → cell tower → phone 1 → phone 2 → cell tower → message

• cell tower → message → phone 1 → cell tower → phone 2 → message

• message → phone 1 → cell towers → phone 2 → message

• phone 1 → phone 2 → messages → cell towers