Bebras ''Easy'' Junior Challenge Problems

Alien residents

Cute creatures live in newly discovered planets.

Match the creature to the correct planet.

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Answer explanation

Spotting patterns is a vital part of problem solving. Now we need to analyse objects – planets and creatures. We need to look for similar features and match planets with creatures. The same feature should be used to make all matches.

Shoestrings

Match the shoestring to the correct shoe.

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Answer explanation

We need to investigate shoes and shoestrings to look for similarities. After information analysis we can draw conclusions.

Painting of Stamps

Little beaver has five stamps.

Using these stamps, he created a painting:

In what order did little beaver use the stamps?

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Answer explanation

This painting illustrates the importance of a sequence. If we create a painting using a different order of objects, then it will be a totally different picture.

Layered painting

Little beaver has six stamps.

By using these stamps, he created a painting.

In what order did little beaver use the first five stamps?

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Answer explanation

Programmers have to prioritise the execution of tasks, or actions. The concept of priority is important in a lot of fields, especially when we need to create new components.

Flags

During a birthday celebration the room is decorated with flags.

Which flag is going to be added next?

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Answer explanation

Programmers have to prioritise the execution of tasks, or actions. The concept of priority is important in a lot of fields, especially when we need to create new components.

Robot controlling a car

A robot controls a car using the following commands.

Forward 1: – draw a line one square forward. There can be any number.

Left: – turn left ninety degrees.

Right: – turn right ninety degrees.

Which one of the programs below drives the car to Beaverland?

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Answer explanation

There is a program created in this problem. A program is a description of actions carried out by a computer written in a programming language. If the program is correct, a computer or robot would do what you told it to. However, if the program has errors, the computer would produce the wrong result. There are 3 rules in this problem that the robot understands.

Robot and cookies

What will the pile of cookies look like when the robot finishes the commands: PUT S PUT S PUT C PUT T PUT C?

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Answer explanation

Computers follow a list of commands to carry out a particular task, this is called a program. The order of commands matters in programming and it is important to understand which actions take place first. A robot, a computer or any other automatic machine performs actions in an exact way in the order they are given.

Shaman beaver

Father beaver is choosing a picture, where:

1) Shaman, the character in the picture does not have a stick and

2) All coat buttons are fastened.

Which is the right picture?

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Answer explanation

The problem is connected to Boolean logic. There are two conditions and both have to met for the picture to be suitable. This uses the Boolean operator AND which needs two true inputs to get a true output.

The strip

Little beaver girl has a long strip of card. She wants to divide it into the same small strips as she is holding in her hand.

What is the maximum number of small strips she can make?

Answer explanation

In programming it is often important to find a pattern. If we find a pattern, then we can write a program for a computer or a machine to find all these patterns.

Christmas tree decorations

Christmas tree decorations should be placed in boxes as follows:

1st box: Large and rounded

2nd box: Small and rounded

3rd box: Long and striped

4th box: Stars and snowflakes

Which decorations do not fit in any of these four boxes?

(click on them ...)

Answer explanation

Grouping objects using common features is called classification. Christmas tree decorations are classified into four different groups. Unfortunately, in this case, there some decorations, which do not fit into any of the groups.