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Timeline

Operators Blocks are used to do arithmetic and logical calculations.
Variables are the data values for which the value can be changed when the code is run.

The statements that are executed on the basis of decision taken from a choice are called
conditional statements.
The automatic running of a set of instructions more than once is called looping.
The sensing blocks in Scratch sense the input from the keyboard or the mouse at the time

of execution of a script.

We store data in the computer memory so that we can get information from it later. This
data is stored in variables.
Scratch has two conditional blocks: If…then….. and If…then….else blocks.

A. Choose the correct option.

1. Which of the following blocks are used to do arithmetic and logical operations?

a. Operators b. Variables

c. Sensing blocks d. Boolean

2. Which of the following blocks are used to sense the input from the keyboard or the mouse
at the time of execution of a script?

a. Conditional blocks b. Sensing blocks

c. Variables d. Reporter Blocks

3. Which of the following is used to run a set of instructions continuously until stopped?

a. Repeat b. Forever

c. Repeat until d. Wait

4. What is the automatic running of a set of instructions more than once called?

a. Looping b. String

c. Script d. Program

B. Tick () the correct statements and cross () the wrong ones.

1. Blocks for looping are given in loop category.

2. Variables are used in programs to store and modify the data.

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