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WorksheetsComputer Science pre-test 9th grade
Total questions: 50
Worksheet time: 50mins
Computers store all files as binary data, even applications.
True
False
The type/kind/format, is often reflected in its file extension.
True
False
How a computer can try to open a file without a file extension?
Application will look for clues within the file header.
Without a file extension the application will ALWAYS crash
The user will need to rename the file with the correct file extension.
Their is no way to run a file without a file extension.
A file with a GIF extension will always start with the letters___________, encoded in binary according to the ASCCII standard.
GIF
IFG
EXE
RUN
A file with the .ZIP extension is :
A text file with a list of data.
A compressed folder of files.
An animated cartoon image
A recording of a song.
A file with the .js extension is :
A text file with a list of data.
A compressed folder of files.
An animated cartoon image
JavaScript, the primary scripting language of webpages.
File sizes are always measured in :
Bits
Bytes
Mega Bits
Bits per second.
A 1000 bytes file is equal to:
1 Kilo Byte
1 Mega Byte
1 Giga Byte
1 Tera Byte
Alejandro wants to explain the importance of file extensions to his friend.
When a file has an extension, users can open files in applications they don't own.
When a file has an extension, the computer can decide what application to open it in.
When a file has an extension, the computer is allowed to store additional metadata about it.
When a file has an extension, the user knows who created the file
William has a smart phone that can store 1 GB of data. He sees a commercial for a new phone that promises storage for 1 TB of data.
Around 2 times more data.
Around 10 times more data.
Around 100 times more data.
Around 1000 times more data.
Kevin is entering the JS1K contest, a contest to write an interesting program in just 1KB of JavaScript code. He's hoping he can rewrite a program that's currently 1MB and enter that for the contest.
Around 1/2 of the original size.
Around 1/100 of the original size.
Around 1/500 of the original size.
Around 1/1000 of the original size
Which of these are examples of metadata for a photo?
👁️Note that there may be multiple answers to this question.
The timestamp when the photo was downloaded.
The number of bytes of data in the file.
The color of the center pixel.
The people who have permission to edit the file.
Which of these are examples of metadata for an audio file of a song recording?
👁️Note that there may be multiple answers to this question.
Choose all answers that apply:
The frequency of the note at 1:30.
The number of bytes of data in the file.
The artist of the song.
The timestamp when the file was created.
The volume at 13 seconds.
Bad Bunny is looking through her computer files and discovers a file that has no extension.
What is true about that file?
It is stored as binary data by the computer.
It must be a text file, since that's the default type for a file.
Its contents are not written following any standard file format.
If it is renamed with an extension, it will become that file format.
It can be opened in any application.
What is an algorithm?
Is a specific procedure for solving a well-defined computational problem.
Is is a mathematical equation to solve a problem.
Is an application to write code.
None of the above
Lossless compression algorithms reduce the size of files without losing any information in the file.
True
False
Lossy compression algorithms reduce the size of files without losing any information in the file.
True
False
Computers can compress text by finding repeated sequences and replacing them with shorter representations.
True
False
A bitmap (or raster graphic) is:
A digital image composed of a matrix of dots.
A sound file composed of a matrix of dots.
A geographical map file.
All of the above
What application in Windows 11 is used to search for files stored in your Computer secondary storage.
File Explorer
Search
Word
Teams
Ram is?
Read only memory
Random access memory
A box
The CPU detroyer
What does LAN stand for?
Micheal
Little actual area
local area network
Large area network
ROM
Read only memory
reach on mate
Random only memory
Raz only mould
Computer screens are divided up into a grid of small dots called .....................?
Bits
Pixels
Packets
byte
Which of the following is Windows 11 logo ?
Which of the following is the Windows 11 Official Background
Select all that apply
Access Widgets on Windows 11 by doing the following?
Click on the Widgets icon on the taskbar
Windows Button + W
Swipe from the left on touch devices
CTRL + Shift + Del
What is this ?
Microsoft Edge
Internet Explorer
Safari
FireFox
What is this ?
icloud
Microsoft Onedrive
Microsoft Solitaire
Paint
What is this ?
Power point
Microsoft Edge
Microsoft Store
Recycle Bin
What is this ?
Google Slides
Microsoft Powerup
Microsoft Powerpoint
Microsoft PLAY
What is this ?
File Manager
Files
File Explorer
Google Docs
There are _____ Enter keys on the keyboard
TWO
ONE
FOUR
THREE
______ keys are used to type numbers
ALPHABET KEYS
NUMERIC KEYS
FUNCTION KEYS
CONTROL KEY
Which of these keys can be used to erase text?
Insert Key
Backspace Key
Window Key
Spacebar Key
There are ____ arrow keys on a keyboard.
3
6
4
2
What do you call a software application used to access and view web pages?
search engine
web browser
internet
none of the above
Is a group of two or more computer systems linked together is called ____?
network
disorganize
unorganize
disorder
Phishing emails will often come from addresses at domains that don't belong to the legitimate company.
True
False
If you ever suspect an email is a phishing attack...
do not click on any links or download any attached files.
click on any links or download any attached files to investigate is they are legit.
Call the Police to file a report.
