Fundamentals of Computer Science with Karel Unit 2 Exam

Which command makes Karel move forward one space?

• move();

• turnLeft();

• pickBeeper();

• putBeeper();

Which command places a ball in Karel’s current square?

• putBall();

• move();

• turnLeft();

• pickBall();

If Karel tries to move into a wall, what happens?

• Karel stops and does not move.

• Karel moves through the wall.

• Karel jumps over the wall.

• Karel turns around automatically.

Which loop is best when repeating a fixed number of times?

• for loop

• while loop

• do-while loop

• foreach loop

Which condition checks that there is no wall in front of Karel?

• frontIsClear()

• leftIsBlocked()

• rightIsClear()

• frontIsBlocked()

Which condition checks if Karel is standing on a ball?

• ballsPresent()

• noBallsPresent()

• frontIsClear()

• facingNorth()

We use functions in Karel programs to:

• organize code and avoid repetition

• make the program run slower

• increase the number of errors

• limit the program's capabilities

The main difference between an if and a while in Karel is:

• An if checks a condition once, while a while repeats as long as the condition is true.

• An if repeats as long as the condition is true, while a while checks a condition once.

• Both if and while repeat as long as the condition is true.

• An if and a while are used for the same purpose in Karel.

At the end, where is Karel and where are the balls?

• Karel is at the final position and the balls are collected.

• Karel is at the starting position and the balls are scattered.

• Karel is outside the grid and the balls are missing.

• Karel is in the middle and the balls are in a line.

Trace this: function main() { putBall(); move(); putBall(); move(); } Which squares have balls after running the code?

• The first and second squares

• The first and third squares

• The second and third squares

• Only the first square