16Hit1600
Expression of IdeasMediumDescribing a process from the notes

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A canal lock is a chamber with gates at each end. - To raise a boat, both gates are closed once the boat is inside. - Water is let into the chamber through sluices from the higher stretch of canal. - The boat rises with the water. - When the water reaches the upper level, the upper gates are opened.

The student wants to describe how a lock raises a boat. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. With the boat inside and both gates closed, water is let in from the higher stretch through sluices; the boat rises with it until the upper gates can be opened.Correct
  2. B. A canal lock is a chamber with gates at each end.
  3. C. Boats are raised in canal locks.
  4. D. A lock raises a boat by draining water out of the chamber until the gates open.

Answer: A. With the boat inside and both gates closed, water is let in from the higher stretch through sluices; the boat rises with it until the upper gates can be opened.

The goal is the sequence. Choice A gives it in order: gates closed, water in, boat rises, upper gates open.

Why the other answers are wrong

B. A canal lock is a chamber with gates at each end.
This describes what a lock IS, not how it raises a boat.
C. Boats are raised in canal locks.
This states the outcome with no process.
D. A lock raises a boat by draining water out of the chamber until the gates open.
Draining water would LOWER the boat; the notes say water is let in.

More Expression of Ideas questions

Not affiliated with the College Board. SAT is a trademark of the College Board.