VEX VR U9 Study Review

What makes up an algorithm?

• Sequence, iteration, and loops.

• Decomposition, selection, and loops.

• Pseudocode, selection, and decomposition.

• Sequence, selection, and loops.

An algorithm is a precise sequence of instructions, implemented using programming languages, for processes to be carried out by a robot.

• True

• False

Which of the following does NOT make up an algorithm?

• Loops

• Selection

• Sequence

• Pseudocode

Which of the following is the best explanation of an algorithm?

• A type of block that can contain other blocks inside of it that all follow a specific programming language.

• A precise sequence of instructions, implemented using programming languages, for processes to be carried out by a robot.

• The way to break down a problem into discrete behaviors that can be used by a robot.

• A mathematical equation that contains an addition and equal sign used to plan a precise sequence of instructions for a robot.

Which of the following blocks runs the blocks inside either the If or the Else branch based on the Boolean value reported?

• [Wait until] block

• [While] block

• [Repeat] block

• [If then else] block

Which of the following best explains why [If then else] blocks are normally used with a [Repeat] or [Forever] blocks?

• In order to check the condition more than once.

• In order to move immediately to the next block without checking any conditions.

• In order to stop the VR Robot from moving.

• In order to check the condition only once.

Which of the following explains why a [Forever] block is needed in this project to ensure that the VR Robot does not fall off of the Playground?

• The [Forever] block ensures that the VR Robot will drive forward forever and not fall off the Playground.

• The [Forever] block will stop the VR Robot from moving.

• Without the [Forever] block, the condition of the Down Eye Sensor detecting red will only be checked once. The VR Robot will drive forward and fall off the Playground.

• The [Forever] block will check the condition of the Bumper Sensor being pressed.

Refer to the diagram showing a programming block for a VR Robot. What behavior will the VR Robot perform if the condition of the Left Bumper Sensor being pressed is TRUE?

• The VR Robot will continue to drive forward forever.

• The VR Robot will drive in reverse for 50 millimeters (mm) and then turn left for 90 degrees.

• The VR Robot will stop moving.

• The VR Robot will drive forward for 50 millimeters (mm) and then turn right for 90 degrees.

Which of the following Boolean blocks should be used in the [Repeat until] block to check if the VR Robot's Down Eye Sensor detects red so the VR Robot does not fall off of the Playground?

• The block

• The block

• The block

• The block

Which of the following best explains why a [Repeat until] block was used in this project instead of a [Wait until] block?

• Using a [Wait until] block would block the project flow. The VR Robot would be waiting until the Down Eye Sensor detected red before doing anything else. This would cause the VR Robot not to move.

• Using a [Wait until] block allows the robot to drive forward for 300 millimeters (mm) and then turn right for 90 degrees, forever.

• Using a [Wait until] block allows the condition of an object being detected to be constantly checked. This allows the VR Robot to drive toward an object when it is detected and turn if not.

• Using a [Wait until] block allows the conditions of the [If then else] block to be skipped. This allows the project flow to execute much faster, as the condition of an object being detected only need to be checked once in the project.