Computational Thinking Practice

To determine light from dark, you need to calculate a _______.

• threshold value

• rotation value

• range detection

• color scale

Answer explanation

Threshold value is when you take the two values and divide by two.

True or false: The set drive velocity block goes under the drive forward block.

• True

• False

Answer explanation

You need to set the velocity before it drives forward or it does not know to change how fast it goes.

The "turn to heading 90 degrees" will do what?

• Turn 90 degrees from North

• Turn 90 degrees from where it is.

• Turn 90 degrees right from where it started at the beginning of the program.

• Turn 90 degrees left from where it started at the beginning of the program.

Answer explanation

What happens if the robot's wheels slip too far during a turn?

• The robot stops where it ends up.

• The wheels leave skid marks.

• The robot moves back to where it was supposed to stop

• The robot crashes.

Answer explanation

The inertial sensor will tell it where it was supposed to be and adjust accordingly.

Big robot behaviors such as "solve the maze" can be decomposed into smaller behaviors such as "turn right" or "drive forward." If you write these small behaviors down in order, this type of list is called _______.

• Sequence

• Pseudocode

• Code comments

• Solution

Answer explanation

You did this for the whole course. Use pseudocode to plan smaller tasks.

Which of the following is a good troubleshooting technique?

• Writing the program all at once.

• Using sounds or lights in between robot behaviors.

• Deleting the program that doesn't work and trying again.

• All of the above.

Answer explanation

Using sounds or lights to indicate where you are in the program can help you figure out what is wrong.

What does a "set ArmMotor stopping to hold" do?

• It has the arm motor stay in the position it stopped in.

• It has the arm motor stop when it gets to a certain position.

• It has the arm motor drop.

• It has the arm motor use the claw to pick up an object.

Answer explanation

Stopping to hold holds the position.

True or false: The "set ArmMotor timeout" block allows the program to continue on to the next block, even if it is unable to reach the desired position.

• True

• False

Answer explanation

Set timeout lets the code keep moving even if it can't get to the position you set it to.

Which of the following have an effect on how the robot turns?

• Friction

• Momentum

• Light

For which of the following tasks would the Bump be will suited?

• Returning a value of 1 if it is pressed and 0 if it is not.

• Allowing a robot to make precise turns

• Making a decision based on color.

• Displaying colors as a program indicator

Answer explanation

Robots make precise turns using the inertial sensor.

Robots make a decisions based on color using the optical sensor.

Robots display colors as a program indicator using the touch LED.