Make sure you have understood everything in this section (Lessons A11, A12, A13, and A14).
Use the Self-Check below, and the Self-Check & Lesson Review Tips to guide your learning.
This is also a good time to visit your Section 4 Checklist to make sure you have completed all the recommended learning activities.

Unit A Section 4 Self-Check

Instructions


Complete the following 6 steps. Don't skip steps – if you do them in order, you will confirm your understanding of this section and create a study bank for the future.

  1. DOWNLOAD the self-check quiz by clicking here.

  2. ANSWER all the questions on the downloaded quiz in the spaces provided. Think carefully before typing your answers. Review the lessons of this section if you need to. Save your quiz when you are done.

  3. COMPARE your answers with the suggested "Self-Check Quiz Answers" below. WAIT! You didn't skip step 2, did you? It's very important to carefully write out your own answers before checking the suggested answers.

  4. REVISE your quiz answers if you need to. If you answered all the questions correctly, you can skip this step. Revise means to change, fix, and add extra notes if you need to. This quiz is NOT FOR MARKS, so it is perfectly OK to correct any mistakes you made. This will make your self-check quiz an excellent study tool you can use later.

  5. SAVE your quiz to a folder on your computer, or to your Private Files. That way you will know where it is for later studying.

  6. CHECK with your teacher if you need to. If after completing all these steps you are still not sure about the questions or your answers, you should ask for more feedback from your teacher. To do this, post in the Course Questions Forum, or send your teacher an email. In either case, attach your completed quiz and ask; "Can you look at this quiz and give me some feedback please?" They will be happy to help you!

Be a Self-Check

Superhero!



Self-Check Quiz Answers

Click each of the suggested answers below, and carefully compare your answers to the suggested answers.

If you have not done the quiz yet – STOP – and go back to step 1 above. Do not look at the answers without first trying the questions.

 
The air blowing upwards through holes on the table gets trapped under the puck. This trapped air has a slightly high pressure, which forces the puck upward.
Viscosity is the most important factor to consider when selecting a bicycle chain oil. The oil should have a high enough viscosity to create a thin layer on the chain, but it should not be so viscous that it attracts dirt and prevents the chain from from moving smoothly.

Since bicycles do not float, density is not an important factor when selecting chain oil. The chain oil does not need to be dissolved in anything, which means that solubility is not an important factor either.
Bicycle tires contain air at a higher pressure than atmospheric pressure. The pump cylinder compresses air particles into a smaller space, which increases their pressure and forces them into the tire.
Ocean water contains salt, which makes ocean water denser than fresh river water. A denser fluid exerts more buoyant force, which means that ships experience more buoyant force and rise further upward in salty ocean water compared to fresh river water.
Sailboats operate by Bernoulli’s principle. The curved shape of a sail works similarly to wings on an airplane. Air moves faster on the outer curved part of the sail, creating a low pressure area. Air moves slower on the inner part of the sail, creating a high pressure area.

Air moves from high pressure to low pressure areas. On the sail, air moves from the high pressure inner side of the sail to the low pressure outer curve of the sail, which pushes the boat forward.