How Submarines Sink and Float — Questions and answers

Read the full story

What is the key to an object floating, according to Zahra's dad?

Choices

  1. Its color.
  2. Its shape.
  3. Displacement. ✓
  4. Its size.

Answer: Displacement.

From page 4

How do submarines change their buoyancy to rise or sink?

Choices

  1. They turn on their lights.
  2. They fill their ballast tanks with air or water. ✓
  3. They paint themselves a different color.
  4. They make loud noises.

Answer: They fill their ballast tanks with air or water.

From page 5

What did Mr. Harris, the science teacher, demonstrate with the model submarine?

Choices

  1. How to clean it.
  2. How to make it light up.
  3. How it dives and surfaces. ✓
  4. How to build one.

Answer: How it dives and surfaces.

From page 6

Which of these did Zahra NOT observe as an example of buoyancy?

Choices

  1. A hot air balloon rising.
  2. A boat floating on the bay.
  3. Herself floating in the swimming pool.
  4. A rock sinking in a pond. ✓

Answer: A rock sinking in a pond.

From page 8