Computational Thinking pre- Quiz

A robot moves through a vertical maze. The maze consists of various platforms. The robot begins in the upper left corner and then moves to the right. When it reaches the end of a platform, it falls down onto the platform below. As soon as the robot lands it changes direction. Eventually the robot reaches one of the buckets at the bottom of the maze. Which bucket will the robot reach in the maze below?

• A

• B

• C

• D

Answer explanation

This special ice cream machine creates cones with 4 scoops of ice cream. It does so in an ordered way. Here you see, from left to right, the last 3 ice creams that the machine has made. Which ice cream will the machine produce next?

• A

• B

• C

• D

Answer explanation

The order always is yellow – blue – purple – red – yellow – blue – purple – red ... In the

picture you can see that red is followed by green, green is followed by blue, ...

Explanation:

Six children were playing in the yard. One of them threw a ball and broke Mr. Beaver's window. Mr. Beaver only saw the back of the child running away. The child had a red shirt and short dark hair. Who broke the window?

• John

• Jane

• Dan

• EVE

• ANNE OR TOM

Answer explanation

Explanation:

Only three of the children wear a red shirt: Jane, John and Dan. But Jane has long blonde hair

and Dan's hair is violet. So, it had to be John.

The Beaver children have found a magic roller. The roller replaces a shape in a painting with the next shape shown by the arrows below.

• A

• B

• C

• D

Answer explanation

B results after applying the algorithm described above.

The other answers are not correct. A and C both have an incorrect second symbol, which

should be a circle. D is incorrect as only the first two symbols are correct.

Beatrix is trying to rearrange her shelf. She has two rules: 1. Rectangular items must not be next to each other. 2. Circular items must not be next to rectangular items. Which one of these shelves has followed her rules correctly?

• 
• 
• 
• 

Answer explanation

Explanation:

A can't be right as there are rectangular objects together.

B can't be right as there is a circular object next to a rectangular object.

C can't be right as there is a circular object next to a rectangular object.

The only correct answer can be D as it follows the rules stated.

To arrange a dinner party Sara the beaver needs to talk to five friends:

Alicia, Beat, Caroline, David and Emil.

Sara can talk to Emil right away. However, to talk to her other friends, there are a few points to

consider:

1- Before she talks to David, she must first talk to Alicia.

2- Before she talks to Beat, she must first talk to Emil.

3- Before she talks to Caroline, she must first talk to Beat and David.

4- Before she talks to Alicia, she must first talk to Beat and Emil.

• Emil

  Beat

  Alicia

  David

  Caroline

• David

  Beat

  Alicia

  Caroline

  Emil

• Beat

  Emil

  Alicia

  Caroline

  David

• Beat

  Emil

  David

  Alicia

  Caroline

Answer explanation

This task has to do with dependencies.

- Emil is the only friend with no dependencies so he must go first.

- Beat only depends on Emil so he can go second.

- Alicia depends on Beat and Emil, so she can go third.

- David depends on Alicia so he can go next,

- Finally Caroline depends on Alicia and David so she can go last.

No other sequence can fulfil the dependencies.

A mouse is at the entrance of a tube system. It wants to reach the cheese at the end of tube 5.

The mouse always follows these commands:

1. Go downwards until a crossing

2. At the crossing, move through to the next vertical tube

3. Go to command 1 Question: In which tube should the mouse start so that it reaches the cheese?

Question:

In which tube should the mouse start so that it reaches the cheese?

1 2 3 4 or 5

• 1

• 2

• 3

• 4

• 5

Answer explanation

From tube 1 the mouse always reaches tube 3.

From tube 2 it reaches tube 1.

From tube 4 it reaches tube 2.

From tube 5 the mouse gets to tube 4.

A robotic car uses a simple rule to drive through a maze:

Turn right whenever possible.

The picture on the right gives an example of how the robot would

drive through a maze.

Question: In how many of the following mazes will the car reach the red dot if it uses this system? Maze A Maze B Maze C Maze D Choose from: 0 1 2 3 or 4

• 
• 
• 
• 

Help the green robot to exit the maze. The robot will repeat your instructions 4 times. Question: Drag the arrows to form a set of instructions.

• 
• 
• 
• 

Kiki and Wiwi are playing L-Game on a 4x4 board.

They take turns placing L-shaped pieces so that

every piece placed by Kiki is oriented as shown below,

every piece placed by Wiwi is oriented as shown below,

every piece is placed entirely on the board, and

no two pieces overlap.

Pieces cannot be moved after they are placed. A player loses the game when it is their turn but it

is not possible to place a piece according to the rules above.

An example where Kiki goes first is shown below. In this example, Kiki can win the game by

placing a piece in the bottom-right corner.

Question:

Kiki has nine possible first moves. In how many of them is she guaranteed to win no matter how

pieces are placed in following turns?

0 1 2 or 3

• 1

• 2

• 3

• 0

Answer explanation