Comp Sci Unit 1 Test

how many unique numbers can each bit number represent? 2 bits ________ = ________ 3 bits ________ = ________ 8 bits ________ = ________

2 squared, 4 2 cubed, 8 2 to the 8th power, 256

Convert the ASCII code to plaintext. 040 094 045 094 041 032 073 032 116 104 101 032 098 101 115116033

(^-^) I'm the best!

what decimal (Base-10) numbers can be represented for each bit number? 2 bits ________ to ________ 3 bits ________ to ________ 8 bits ________ to ________

0 to 3 0 to 7 0 to 255

Write the 6-bit color binary for each of the following colors. a. The brightest cyan producible b. The brightest yellow producible c. The dimmest / darkest green d. The dimmest / darkest cyan

00 11 11 11 11 00 00 01 00 00 01 01

Complete the binary sequence in ascending order 0001, 0010, 0011, 0100,

0101, 0111, 1000, 1001, 1010.

Convert the following decimal numbers to 4-bit binary 7= 10= 13=

0111 1010 1101

Convert binary numbers to decimals 0010110= 0010110= 11111111=

22 135 255

What is the maximum number of bits for each of the scenarios. How many states are in the U.S The number of students in the class The sum of two 2-digit numbers Age of a human being

6 5 8 7

Modern computer systems are not capable of storing and processing the full range of known numbers with 100 percent accuracy and precision. Which choice is not a good example of this? A) 2/3 B) An approximation of π C) The set of real numbers D) Irrational numbers

B

What is not a concern when it comes to the idea of 'overflow.' A) The odometer of a car reaches its limit. B) A modern computer converting ASCII code to a corresponding character or symbol. C) A computer database system that has a 4 bit binary to store the different colors of paint from a large paint manufacturer. D) A super calculating computer calculating every prime number.

B

What is the most important quality of lossless compression? A) The data is transformed to usually make it smaller. It cannot always be re-constructedback to the original. B) The data is transformed to usually make it smaller. It can always be re-constructed backto the original. C) The data is transformed to always make it smaller. It can always be re-constructed backto the original. D) The data is transformed to always make it smaller. It cannot always be re-constructed back to the original.

B

Which is false about Creative Commons and intellectual property? A) The licenses provided by Creative Commons express the restrictions on how the owner's work can be used. B) Creative Commons provides free licenses that allow anyone to use copyrighted work with zero restrictions. C) A Creative Commons license may be beneficial to an owner who would like their work to be better recognized by the public. D) Creative Commons allows the public to use copyrighted work without permission.

B

Which one is false? A) Lossy compression is sometimes more suitable than lossless compression. B) Our school networks benefit from only lossy compression. C) Lossless compression is a must when compressing textbook files. D) Compression usually allows us to send and receive data faster.

B

What colors are produced given the following 6 bits? a. 11 11 11 b. 00 00 00 c. 11 00 00 d. 11 00 11

White, Black, Red, Magenta

Analog vs. Digital. When we record a singer's voice with a smartphone, which is true? A) Smartphones can store the singer's voice data in both analog and digital form. B) Smartphones can only store data from a digital source. C) The singer's voice is analog which is being stored digitally on the smartphone. D) The singer's voice is analog which will have an analog recording on the smartphone.

C

When sending/communicating information, what is not true about the usage of symbols? A) Having fewer number of symbols for efficient communication of complex messages likely requires a standardized acceptance and understanding of how to interpret them through sequencing and patterns. B) Computers use only 2 symbols in their most basic form due to the nature of how circuitry and electronics function in an on and off state. C) A set of 0's and 1's can only be interpreted as numbers. D) Having more symbols always makes communication easier and faster.

C

Which statement about analog and digital images is true? A) Digital images come from data that is measures continuously. B) Analog images come from data that is measured at regular intervals. C) Sampling an analog image more frequently produces a digital image with a better representation. D) With advances in technology, digital images look exactly like the analog images they represent.

C

Which statement is false for lossless compression? A) Lossless compression often reduces the memory required for storage. B) A dictionary or key is necessary for lossless compression to function correctly. C) Information compressed through lossless compression can sometimes be unretrievable after compression. D) Lossless compression is best for archiving textbooks.

C

Which of the following would more result in a better digital approximation of an analog black and white image? A) Using fewer bits to represent the image. B) Using decimal numbers to represent each pixel. C) Getting another source picture. D) Increasing the sample rate of pixels collected to produce the image.

D

True or false. If false, correct it. If a computer represents data in 0's and 1's which make up a byte.

False it's a bit, not a byte

True or false. If false, correct it. Fair use is decided by the owner of the copyright.

False, fair use, when challenged, determined by a judge/court.

True or false. If false, correct it. If we increase the number of bits of a computer storage system, programmers will never need to be concerned with round-off and overflow errors.

False, round-off, and overflow errors can be reduced, but never eliminated since the physical analog world can be infinite, large, and small.

Which is/are true about sample rate and bit depth for an image? I. Higher sample rate would result in a sharper image. II. Higher bit depth would result in color banding. III. Higher sample rate for images would fix color banding. IV. Higher bit depth increases the number of color shades producible by a computer.

I IV

Assume your friend just sent you 32 bits of pixel data (just the 0s and 1s for black and white pixels) that were encoded after sampling an image. Choose the two statements that are true. I. The 32 bits of pixel data is enough to produce the image using the widget. Nothing else is needed. II. The digital image would be an exact copy of the analog image. III. The correct width and height must be input into the pixilation widget to produce the image. IV. The fact that only 32 bits were used to represent the image indicates relatively large sample squares were used. The digital image may vary from the analog image significantly.

II III

Decide if lossless or lossy compression would be more ideal for the given situation. i. Archiving medical records ii. compressing a text message over a network. iii. Streaming a video on a smartphone with a 2GB data limit. iv. Data on a Blu-ray disc being played on a home theater. v. A digital image that is meant to be printed on large posters.

Lossless Lossless Lossy Lossless Lossless

Article: Athletes don't own their tattoos. That's a problem for video game developers. www.todayonline.com

Make sure that you analyze and draw conclusions about this article for the test.

In binary, the number of unique arrangements ______ with every additional bit. For example 3bitscan represent ____ arrangements, which 4 bits can represent _____. In our base 10 system, every additional digit we use, we get ____ times more possible numbers.

doubles, 8, 16, 10