DAV Class 7 Computer Chapter 3 Scratch - II, Scratch -2 Notes / Question Answer / Solution

 DAV Public School Class 7 Computer CHAPTER 3 Scratch - 2, DAV Class VII Computer Chapter 3 Scratch - II

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1.    Answer these following

questions:-1  How many blocks are there in scratch?

Ans. There are 8 blocks in Scratch.

i.           Motion

ii.           Pen

iii.           Control

iv.           Variable

v.           Sensing

vi.           Operator

vii.           Sound

viii.           Look

2)    What is the use of the Sound block?

Ans. The set of pink colour blocks are Sound blocks which are used to add  sounds in an animation.

3)    What are variables? How many types of variables?

Ans. A variable is a changeable value recorded in Scratch’s memory. Variable can only hold one value at a time. These values can be either numbers or strings.

There are two types of variables.

i.           Global Variables

ii.           Local Variables

4)    What are operator blocks?

Ans. The set of light green colour blocks are Operator blocks which are used to make comparisons  or perform arithmetic functions of different values.

5)     Write the functions of Looks blocks.

Ans. Looks blocks control the look and appearance of a sprite and give it graphical effects.

6)    How many types of Operators contain Operators blocks?

Ans. The Operators button contains Arithmetic, Relational and Boolean operators.

2.   Give a single term for the following statements.

a)    A block that starts every script.

CONTROL BLOCKS

b)   A block that holds numbers and strings.

VARIABLE BLOCKS

c)    A block that loops the other blocks.

CONTROL BLOCKS

d)   A block that stops the scripts.

CONTROL BLOCKS

e)     A block that is the condition block.

OPERATOR BLOCKS

3.  Fill in the blanks.

a)    The Pen button makes a sprite a writing instrument.

b)   The Looks button gives graphical effects to a sprite.

c)    Strings are made of letters. Words, digits or other characters.

d)   Sounds to script are added using Sound block.

e)    Pen block is used to create interactive Games.

 

  Define the following blocks.

aa) Sensing blocks: - The Sensing block identifies what is happening at a given point and makes the sprites or background respond.

Bb)  Looks Blocks: - The Looks blocks control the look, size and position of the sprite.

   c)   Variables blocks: - The Variable blocks are used for timing games or keeping scores or for defining how many times a loop needs to run.

dd)  Sound Blocks: - The sound blocks are used to add sounds in an animation.

   e)  Control blocks: - The control blocks let you control the blocks within the scripts, inserting conditional statements, loops, repeats and pauses.

 5.   True or False.

  a) In Scratch, there is a control block to repeat operations some number of times. True.

  In Scratch, there is a control block to repeat operations some number of times. True.

b)  In Scratch, a sprite cannot have more than one costume.

False.

c)   In Scratch, a sprite can use different instruction blocks to move around the stage. True.

d)  In Scratch, a sprite must put the “pen down” before it can “stamp”. True.

e)  Sound block plays video files. False.

6. Match the following.

a)   Motion Button  i. Sprite becomes a writing instrument.

b)  Looks Button    ii. Sprite moves and turns.

c)    Sensing Button  iii. Sprite’s costume is changed

d)  Pen Button    iv. Sprite follows the defined condition.

e)     Control Button  v. Sprite senses the mouse and the keyboard.

   Ans. (a) - (ii)

(b)   - (iii)

(c)   - (v)

(d)   - (i)

(e)   - (iv)

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