An Introduction to Scratch Programming (Primary Computer Studies)
ASSESSMENT ZONE
1. Tick (✓) the correct answer.
a. Which among the following area in the Scratch window is used to show the output?
i. Title Bar. [ ]
ii. Action Library. [ ]
iii. Stage. [✓]
b. Which among the following blocks in the Control script is used to create a block that executes continuously?
i. wait 1 secs. [ ]
ii. forever. [✓]
iii. repeat 10. [ ]
2. Write (T) for True or (F) for False.
a. It is possible to select a different sprite other than a cat. [T]
b. The green colour is associated with the Motion scripts. [F]
c. The 'clear' command of the Pen script is used to remove all line traces. [T]
d. The pen up command of the Pen script is used to trace a line with a moving object. [F]
e. The Sound script allows you to insert sound effects into your program. [T]
3. Answer the following questions.
a. What is a program?
= Program is a step-by-step method of giving instruction to the computer.
b. What is so special about Scratch?
= Scratch is for children. We can program both in online and offline mode in scratch.
c. Name the menu options in the Menu Bar of Scratch.
= The menu options in the Menu Bar of Scratch are - File, Edit, Tips and About.
d. What is Actions Library used for?
= The Action Library is used to produce some actions with the chosen object.
e. What is a Sprite?
= Sprite is usually a cartoon character or any object that will be used for animation. The default Sprite is a cat.
f. What is the forever block used for in the Control scripts?
= The forever block in the Control script is used to execute a set of commands forever, i.e. infinitely.
g. What is the significance of the command 'if on edge, bounce'?
= This is to tell that after the cat reaches the edge of the screen it should move back into the other direction.
h. Name and state any 3 commands of the Pen Script.
= Three commands of the Pen Script are :-
i. Clear : It is used to remove all line traces.
ii. Stamp : It is used to stamp the image of the sprite, thus making a copy of the sprite.
iii. Pen Up : It is used to lift the pen, thus the line tracing is not produced wherever the sprite moves.
i. What is Sound script used for?
= The Sound scripts are used to produce the sound effect with the sprite object.
j. What is Backdrop Library?
= To change the background(which is white by default) of the Stage area, we have to click on backdrop button on the bottom left corner of the Scratch window. That will take us to a library of backdrops. There we can chose from the backdrops and change the background of the Stage area.