WorksheetsUnit 1
Total questions: 21
Worksheet time: 16mins
Which of the following best describes how computing devices represent information?
A computer will either represent information as bits or bytes but not both
A computer represents data as a byte which is either a 0 or a 1
A computer represents data as bits which is either a 0 or a 1
A computer represents information as bits which contain 8 bytes.
Which of the following is true about how analog data is converted to digital data?
The digital version is a representation of the analog, but may not contain all of the details.
To make the digital version be a more accurate representation of the analog data, the process should use fewer bits to represent each sample.
A longer interval between measured samples means more details will be captured in the conversion from analog to digital.
The digital version contains all of the details of the analog data, as long as enough storage capacity is available.
How many bits are in two bytes of data?
4
8
12
16
The binary number 1001 is equal to what in decimal?
1,001
17
8
9
The digit C in hexadecimal is equivalent to what in decimal?
12
13
3
2
With 8 bits of data, what is the largest decimal number that can be represented in binary?
256
1111 1111
255
1000 0000
The number 43, when represented in binary is
0100 0011
1010 1101
0010 1011
0011 0001
A computer program is using 4 bits to represent an integer. When the program adds the decimal numbers 10 and 6, the result is 0000. Which of the following describe the result? (Select two that apply)
The number 16 in decimal is 0000 in binary.
An overflow error occurred.
a roundoff error occurred.
You cannot represent the number 16 with 4 bits.
ASCII is an abstraction because
it allows the user to know the binary code for each character.
the user can type letters and other characters without knowing the binary code assigned to them.
it helps the user convert the decimal representation of a letter to the binary representation for the letter.
the user can read a binary message and translate it into characters.
Which of the following statements about sampling is incorrect?
Sampling is a process that can be used to compress an image.
Sampling is a process for turning an analog image into a digital image.
When smaller samples are used, the resulting file will require fewer bytes.
Each pixel of the analog image is coded as one color, and cannot be more than one color.
Given the hexcode A3BD02, which of the following describes the "blue" part of the pixel?
A3
30
B2
02
What is the difference between Lossy and Lossless compression?
With Lossy compression, none of the data is lost.
With Lossless compression, a file cannot be decompressed to its original state.
Lossless compression will usually reduce a file size less than Lossy compression.
Lossy compression is reversible.
Which of the following is most likely to be an unethical use of computer resources?
Purchasing an app and downloading it to a smartphone.
Downloading open source software to your computer.
Purchasing a single-user copy of a photo editing software and sharing your login with another person.
Purchasing a stock photo and putting it in a newsletter that is distributed to a large group of people.
Your computer uses 3 bits to represent numbers 0,1,2, etc. What is the smallest number where an overflow event occurs?
3
4
7
8
Use your flippy do to convert this number to decimal: 1011
10
11
100
101
Convert the arabic number 28 to a binary number.
11100
11101
10000
10100
Which of the following is NOT true of how computers represent complex information?
Computing devices use patterns of bits to represent complex information
Abstraction helps represent complex information by surfacing complexity that might otherwise be hidden
Depending on context the same sequence of bits may represent different types of information
Common abstractions that are represented by computing devices include numbers, characters, and color.
When visiting a museum Lian takes a photo of a painting with a smartphone which stores the photo as an image file. Which of the following best describes the differences between the painting itself and the photo of the painting stored on the smartphone?
Both the painting and the photo are analog
The photo is a digital representation of the analog painting
Sampling can be used to determine whether the analog image is an accurate representation of the painting
The phone can represent the photo in either digital or analog formats depending on the sampling technique that is used
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?
14
15
16
17
Convert the binary (base-2) number 1001 to decimal (base-10).
9
10
16
17
Which of the following binary (base-2) numbers is LARGEST?
11000000
01111111
00000001
10111111
