CS Principles Unit 1 Review

CS Principles Unit 1 Review

Explorations in Computer Science

Before beginning

• get your flippy do's

• get scratch paper

• get a pencil

As you complete the review, be sure to try the ones you got wrong again and/or contact me with questions.

Good luck!!!

Multiple Choice

What is a bit?

• A binary digit

• A small piece of cookie

• A binary information table

• A binary index table

Multiple Choice

A bit can store

• 8 pieces of information

• 4 pieces of information

• 2 pieces of information

• 1 piece of information

Multiple Choice

A byte is

• 8 bits

• 4 bits

• 2 bit

• 1 bit

Multiple Choice

Binary numbers have a base of

• 8

• 4

• 2

• 1

Multiple Choice

Binary numbers can use the digits

• 0 and 1

• 0, 1, and 2

• 0, 1, 2, and 4

• 0, 1, 2, 4, and 8

Have your flippy do ready:)

Multiple Choice

Convert 11111 in binary to a decimal (base 10 number).

• 32

• 30

• 34

• 31

Multiple Choice

Convert 1000000 in binary to a base 10 number.

• 64

• 32

• 16

• 8

Multiple Choice

Convert 10001 in binary to a base 10 number.

• 15

• 16

• 17

• 18

• 19

Multiple Choice

Convert 25 in base 10 to a binary number.

• 11010

• 10110

• 11011

• 11001

Multiple Choice

Convert 58 in base 10 to a binary number.

• 101110

• 111010

• 110011

• 111001

Multiple Choice

Convert 65 in base 10 to binary.

• 1001001

• 1010101

• 1100110

• 1000001

Multiple Choice

A program wants to store a number that is too big to be represented with the number of bits given. What happens?

• The program crashes.

• The last part of the number is stored. This is called ending partial storage.

• The first part of the number is stored. This is called beginning partial storage.

• The number cannot be represented accurately. This is called overflow.

Multiple Choice

When a number such as

$$123\ \frac{2}{3}$$  is stored in memory, it cannot be represented accurately because it is an infinite decimal.  This is called

• a rounding error

• a partial decimal error

• a partial fractions error

• an infinite decimal error

It is a rounding error because a rounded value will be stored in memory.

Multiple Choice

Text is stored in memory by

• each character being part of the storage by the cpu

• each character is stored in RAM and can be accessed when called

• each character is stored using a given ASCII or Unicode value

Multiple Choice

Images are stored

• by using a designated number of bits to represent a pixel

• by always using one bit to represent one pixel

• by storing the colors in one file and the pixels in another. These files then work together to display the image.

• with 100 bytes always

Multiple Choice

Images may be stored using lossy or lossless compression.

• True

• False

Multiple Choice

Lossless compression means that

• files can be decompressed with no loss of information

• files are always stored using the same number of bits as the original file

• files can be decompressed with very little loss of information

Multiple Choice

Lossy compression means

• when files are decompressed, there is some loss of information

• an image will always be blurry

• when files are decompressed, they can be restored to the original file with no loss of data

Multiple Choice

Lossy compression

• is never good

• is always good

• whether is it appropriate for a situation depends upon the situation

Multiple Select

Compression is important because (check all that apply)

• it saves memory

• it can help a webpage load faster

• it can help information travel faster over the Internet

• it makes images blurry

Multiple Choice

Which best represents the difference between analog and digital files?

• Katie plays music on the piano. Her mom records it. Katie playing is an example of what we hear in an analog format. The recording is a digitization.

• Katie plays music on the piano. Her mom records it. Katie playing is an example of what we hear in an analog format. The recording is also analog because it recorded the actual notes played.

• Katie plays music on the piano. Her mom records it. Katie playing is an example of what we hear in digital format. The recording is an analog format.

Multiple Choice

Many files are stored using abstraction. One particular example of abstraction is lossy data compression of images. What is abstraction?

• taking data from a file (such as an image) and reproducing it exactly

• taking data from a file and adding data to enhance it (such as enhancing an image)

• taking data from two files and combining them to create something new

• taking data from a file and reducing it in a way that leaves the essentials (even though it is not known how this is done to the person using the file

Multiple Select

What is true about intellectual property? Choose all that apply.

• Intellectual property is a creative work or invention

• Intellectual property has rights and may apply for a copyright, patent, etc.

• Anyone can use intellectual property at anytime in any way without giving credit to the creator

• Anyone can create intellectual property and choose to apply for a copyright, patent, etc.

Multiple Select

What is true about Creative Commons? Check all that apply.

• There is more than one Creative Commons license

• A Creative Commons license allows a creator to give permission for others to use his/her work and in what way.

• A Creative Commons license can specify whether or not a work can be used for commercial purposes.

• A Creative Commons license can allow creators to freely give up their to be used by anyone in whatever manner they choose.

Multiple Select

Open source software (check all that apply)

• can be free to anyone who would like to use it

• can be modified by anyone who would like to use it

• can be modified and then distributed by anyone who chooses to do so

• Some video games are open source

Before taking the test, please

• Review anything in this Quizizz that you struggled with

• Login to your Code.org account. Review the lessons.

• Contact me with any questions!

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