How Encrypted Radio Communication Was Built — Questions and answers

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What two things did Tarek want to know about old radio communication?

Choices

  1. How to turn it on and off, and if it could play music.
  2. How people talked far away, and how they kept messages secret. ✓
  3. How much it cost, and who owned it.
  4. If it used batteries, and if it was waterproof.

Answer: How people talked far away, and how they kept messages secret.

From page 2

What happened right after Tarek opened his glowing Invention Encyclopedia?

Choices

  1. His mom called him for dinner.
  2. He fell asleep immediately.
  3. His room dissolved into swirling light. ✓
  4. A loud alarm started ringing.

Answer: His room dissolved into swirling light.

From page 3

What did Astrid tell Major Priya Tarek was helping her with?

Choices

  1. Finding buried treasure
  2. Learning about marine life
  3. Radio repairs ✓
  4. Cooking dinner

Answer: Radio repairs

From page 5

What was the purpose of the encryption machine Astrid showed Tarek?

Choices

  1. To make music louder
  2. To scramble messages and keep them secret ✓
  3. To help find lost items
  4. To light up the workshop

Answer: To scramble messages and keep them secret

From page 6

What big problem did Major Priya announce?

Choices

  1. They ran out of power for the machines.
  2. The enemy was about to intercept a crucial message. ✓
  3. Tarek accidentally broke something important.
  4. Grandma Astrid lost her notebook.

Answer: The enemy was about to intercept a crucial message.

From page 8

How did Tarek and Astrid save the crucial message?

Choices

  1. They hid the message in a secret place.
  2. They devised a new code using the 'one-time pad' method. ✓
  3. They sent a decoy message to trick the enemy.
  4. They stopped the enemy's machines from working.

Answer: They devised a new code using the 'one-time pad' method.

From page 9