CBSE Class 4 Computer Science Algorithms and Flowcharts Worksheet Set 01

Answer: An algorithm is a group of step-by-step instructions, written in simple English, to solve a particular problem.

Teacher's Note:
1. It breaks a task into small steps in the right order.
2. For example, the steps to make tea form an algorithm.

Answer: A flowchart is a diagram that shows the steps of an algorithm using special symbols joined by arrows.

Teacher's Note:
1. The symbols show what kind of step is being done.
2. The arrows show the order in which the steps are followed.

Answer: The main symbols are the terminal (oval) box for start and end, the process (rectangle) box, the input/output (parallelogram) box, the decision (diamond) box, the connector (circle) and arrows.

Teacher's Note:
1. Each symbol has its own shape and meaning.
2. Learn the shape along with its use.

Answer: A program is a set of instructions given to a computer, written in a special computer language, to make it perform a task.

Teacher's Note:
1. The computer follows the program exactly as written.
2. Without a program, a computer cannot do any work.

Answer: First the problem is understood and an algorithm and flowchart are prepared. Then the steps are written in a programming language and the program is tested and corrected.

Teacher's Note:
1. Planning comes before writing the code.
2. Testing helps to find and remove mistakes.

Answer: electronic

Teacher's Note:
1. A computer works with electricity and electronic parts.
2. It cannot think on its own and needs instructions.

Answer: Algorithm

Teacher's Note:
1. Such steps are written in order.
2. They can be drawn later as a flowchart.

Answer: terminal (oval)

Teacher's Note:
1. The same symbol is also used to show the end.
2. It is usually marked Start or Stop.

Answer: diamond

Teacher's Note:
1. It is used where a Yes or No choice is made.
2. Two arrows leave it, one for each answer.

Answer: program

Teacher's Note:
1. It is written by a programmer.
2. It tells the computer what to do and in what order.

Answer: True. Programs are written in languages that are close to human language.

Teacher's Note:
1. High-level languages are easier for people to read and write.
2. They are later translated into the computer's own language.

Answer: True. The process box is a rectangle and shows an action or calculation.

Teacher's Note:
1. Remember it as a plain box for doing something.
2. Do not confuse it with the diamond decision box.

Answer: True. An algorithm lists the steps in the order in which they are done.

Teacher's Note:
1. Small steps make a big task easy.
2. The order of steps must be correct.

Answer: False. The terminal box is oval; the parallelogram is used for input and output.

Teacher's Note:
1. The terminal box shows the start and the end.
2. Check each symbol's shape carefully.

Answer: True. Every flowchart begins and ends with a terminal box.

Teacher's Note:
1. It is drawn as an oval.
2. It is labelled Start or Stop.

Answer: False. The decision box is shaped like a diamond.

Teacher's Note:
1. Stars are never used in flowcharts.
2. The diamond shows a question with two possible answers.

Answer: True. A connector is a small circle used to join one part of a flowchart to another.

Teacher's Note:
1. It is useful when a flowchart is long.
2. It keeps the drawing neat.

Answer: False. A program has to be written in a computer language that can be translated for the computer.

Teacher's Note:
1. Programming means giving instructions in a language the computer can use.
2. Learning a language such as Scratch or Python is a good start.

Answer: The parallelogram. It is used for reading data in or showing results.

Teacher's Note:
1. Input and output share one symbol.
2. It is slanted like a leaning rectangle.

Answer: Arrows join the symbols and show the direction in which the steps flow.

Teacher's Note:
1. Without arrows, the order would be unclear.
2. A flowchart is normally read from top to bottom.

Answer: 1. Start. 2. Boil water in a pan. 3. Add tea leaves and sugar. 4. Add milk and boil for a minute. 5. Strain the tea into a cup. 6. Stop.

Teacher's Note:
1. The steps must follow the correct order.
2. Each step should be short and clear.

Answer: 1. Start. 2. Read the first number. 3. Read the second number. 4. Add the two numbers. 5. Display the answer. 6. Stop.

Teacher's Note:
1. Algorithms for computers always read input first.
2. The answer is shown only at the end.

Answer: A flowchart gives a clear picture of the steps, so the program can be planned properly and mistakes are easier to find.

Teacher's Note:
1. Planning saves time while programming.
2. A picture is easier to check than long text.