Computational Thinking A15

You are playing a game of tic-tac-toe with your friend. First your friend has to place an 'O', then

you place your 'X'. You continue taking turns in this way. The player who places their three

marks in a horizontal, vertical or diagonal line wins.

It is your turn to put an 'X' in the grid below:

Click on the grid to place your 'X’ so that you have the best chance of winning.

(a)  

The diagram shows how a watering system is connected.

The system consists of tubes and valves. Open and closed valves are shown in the diagram by the direction of the

switch.

Water only flows through open valves Open valve Closed valve

Which of the flowers (if any) will receive water when the valves are in the positions shown below.

Click on the flowers that will receive water so that they look bright and fresh.

Leave the flowers that will not get any water looking wilted.

(a)  

It is time for bed! Every beaver should have a toothbrush that matches their size. But look at the

picture to see what has happened.

“Not so fast!” sighs mother beaver. “Eve and Chad, swap your brushes! Ann and Chad, you too!” But then she does not know how to continue.

!

Which two beavers still need to swap their toothbrushes so that all the beavers have the correct brushes?

• Ben and Chad

• Ann and Eve

• Ben and Dan

• Nobody

At the LIFO ice cream parlour the scoops of ice cream are

stacked on your cone in the exact order in which you ask for them.

What do you have to say in order to get the ice cream shown in the picture?

I would like to get an ice cream with ...

• ... Chocolate, Smurf and Strawberry!

• ... Strawberry, Smurf and Chocolate!

• ... Chocolate, Strawberry and Smurf!

• ... Strawberry, Chocolate and Smurf!

Johnny has 4 photos. He wants to give one to Bella.

He asks Bella three questions to help him select the best picture.!

Johnny's Question Bella's Answer

Do you want a photo with a beach umbrella? Yes

Do you want a photo where I wear something on my head? No

Do you want a photo where you can see the sea? Yes

!

Which photo should Johnny give to Bella?

• 
• 
• 
• 

A princess has a magical bracelet that looks like this:

When she stores her bracelets in her drawer she first opens them.

• 
• 
• 
• 

Daniel is sending text messages from his old phone.

For every letter he has to press the proper key once, twice, three or four times, followed by a short pause.

In order to type 'C' he has to press the number 2 key three times because 'C' is the third letter written on this key.

In order to type 'HIM' he has to press the number 4 key twice, followed by the number 4 key 3 times and finally the number 6

key once.

Daniel presses exactly six times to enter the name of a friend.

What is the name of his friend?

• Miriam

• Iris

• Emma

• Ina

The beaver family have three mobile phones but none of the batteries have any charge.

It takes 1 hour to fully charge a mobile phone but this does not need to be done all in one go.

The beaver family only have two mobile phone chargers in the house. !

What is the shortest time they need to fully recharge the three phones?

• 3 hours

• 2 hours

• 1 hour and a half

• 1 hour

In the basement of a castle lives a monster. The

monster is hiding in one of the yellow rooms.

The monster can only stay in yellow rooms.

You want to catch the monster. Click on any yellow room. This will reduce the total number of yellow

rooms by half. Click again on another yellow room,

etc.

When there is only one yellow room left you have

caught the monster.

Find the lowest number of rooms you need to click to

trap the monster.

Save the lowest number of clicks required as

your answer.

(a)  

Some space explorers landed on an empty planet. From their ship they could see a maze with an unknown golden object in it.

The explorers dropped their robot into the maze hoping it could take a closer look at the

unknown object. Unfortunately the robot broke during the fall and can now only send and

receive garbled instruction about where to go.

The robot suggests four possible directions it can go. Even though the words in the instructions

are garbled, there are still only four different words, each indicating north, west, east or south.

When following the instructions the robot will move into an adjacent square as instructed.

Which instructions should the explorers send the robot in order for it to reach the

golden object?

• Ha' poS poS Ha' Ha' nIH

• Ha' poS poS Ha' nIH Ha'

• Ha' Ha' poS Ha'

• Ha' poS nIH vI'ogh Ha' poS