Computer science unit 1 quiz 1
Convert the binary (base-2) number 1001 to decimal (base-10) A. 9 B. 10 C. 16 D. 17
A
Which of the following binary (base-2) numbers is LARGEST A. 11000000 B. 01111111 C. 00000001 D. 10111111
A
Arman takes a picture with his smartphone which the subsequently posts online. beatrice finds the picture online and posts a copy of it on her website with an attached creative commons license. Which of the following best describes who owns the photo. A. Beatrice because only holders of a creative commons license can own the photo B. Arman owns the photo because he was the original creator and did not license the work C. Arman owns the photo because it was generated a creative compression license by another person online D. Both owns the photo because creating a copy makes it her intellectual property
B
Convert the decimal (base-10) number 20 to binary (base-2) A. 10010 B. 00101 C. 11000 D. 10100
D
Which of the following describes how computing devices represents information? A. A computer will either represent info as bits or bytes but not both B. A computer represents data as bytes which is either 0 or 1 C. A computer represents data as bits which is either 0 or 1 D. A computer represents info as bits which contains 8 bytes
C
When visiting a museum Lian takes a photo of a painting with a smartphone which sores the photo as an image file. Which of the following best describes the differences between the painting and the photo of the painting stored on the smartphone? A. Both the painting and the photo are analog B. The photo is digital representation of the analog painting C. Sampling can be used to determine weather the analog image is an accurate representation of the painting D. The phone can represent the photo in either a digital or analog formats depending on the sampling technique that is used
B
Which of the following computers represent numbers? A. Using a fixed but large number of bits can eliminate the possibility of round off error when representing in binary B. When a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors C. Using a fixed but large number of bits, for ex 128, eliminates the possibility of overflow errors D. When a large but fixed number of bits is possible for eliminate round- off errors or overflow errors, but not both
B
which of the following is NOT true of how computers represent complex info? A. Computing devices use patterns of bits to represent complex info B. Abstraction helps represent complex info by surfacing complexity that might otherwise be hidden C. Depending on context the same sequence of bits may represent different types of info D. Common abstractions are represented by computing devices including numbers, characters and color
B
which of the following is true of lossy and lossless compression algorithm A. loss compression algorithms are used when perfect reconstruction of the original data is important B. Lossy compression algorithms are typically better than lossless compression algorithms at reducing the number of bits needed to represent a piece of data C. lossless compression algorithms are only used to compress data D. lossless compression algorithms only allow for an approx. reconstruction of original data
B
Which of the following is true of intellectual property? A. info created on a computer is not owned by anyone since only analog info is protected under copyright law B. You do not need to cite work created by someone else if both the original work and your use of it are in digital form C. Creative commons enables content creators to freely distribute that otherwise copyright work D. Creative commons has severely hindered broad and open access to digital info
C
Your computer uses 4 bits to represent decimal numbers (0, 1, 2, 3 and so on) in binary. What is the SMALLEST number for which an overflow error occur? A. 14 B. 15 C. 16 D. 17
C
How many total numbers can be represented with an 8-bit binary (base-2) system? A. 127 B. 128 C. 255 D. 256
D
Jorge is sending a large image file to a friend as part of a shared classroom project. which of the following is true if Jorge opts to compress the image before sending it? A. the image can be no longer the represented using bits B. the image will have been converted into an analog form C. the image will require more pixels to display it on the screen D. the image will require fewer bits in order to be represented
D
Lucy is completing a project as part of a science class using materials she found online. Which of the following is MOST LIKELY to lead to legal consequences? A. Modifying a piece of open source software B. Using open access for which she does not acquire in a license C. Failing to push her work under a Creative Commons license D. Using images posted online by another student without permission or citation
D
Ryan is designing an app that needs to quickly send low quality photos between users. Most smartphones take much higher quality photos than ryan needs for his app. Which of the following best describes the type of compression ryan should choose and why? A. lossless compression since it ensures perfect reconstruction of the photo B. lossy compression since it ensures perfect reconstruction of the photo C. lossless compression since it typically results in smaller data sizes D. lossy compression since it typically results in smaller data sizes
D
