Unit 1: Digital Information - Practice Test
Quiz by McCartney, Callie R
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- Q1
Which number system is used to store information digitally in a computer?
Decimal (base 10)
Hexadecimal (base 16)
Binary (base 2)
Octal (base 8)
30s - Q2
How many different digits are used in the Hexadecimal number system?
8
16
10
2
30s - Q3
What is the decimal value of 11012?
1.10110
110110
1310
1210
30s - Q4
How many different values can be represented using 4 bits?
8 different values
4 different values
32 different values
16 different values
30s - Q5
Suppose the ESPN website uses 8-bit unsigned integers to store how many points a team has scored in an NBA game.
For example:
0000 0010 represents 2 points
0000 1000 represents 8 points
What is the highest possible score the ESPN website could display?
1111 111110
25510
25610
12810
30s - Q6
An online store uses 8-bit binary values to identify each unique item for sale. The store plans to increase number of items it sells and is considering changing to 9-bit binary values.
Which of the following best describes the result of using 9-bit values instead of 8-bit values?
2 times as many items can be uniquely identified
2 more items can be uniquely identified
9 more items can be uniquely identified
29 times as many items can be uniquely identified
30s - Q7
A news website uses 32-bit integers to count the number of times an article has been viewed.
The website is becoming more popular, and expects some of the articles to exceed the number of views that can be represented with 32 bits. In anticipation of this, the website is planning to change to 64-bit integers for the view counter.
Which of the following best describes the result of using 64-bit integers instead of 32-bit integers?
2 times as many values can be represented
32 times as many values can be represented
232 times as many values can be represented
322 times as many values can be represented
30s - Q8
ASCII is a character encoding scheme that uses a numeric value to represent each character.
For example, the uppercase letter ‘G’ is represented by the binary (base 2) value 0100 0111, which is equivalent to the decimal (base 10) value 71.
A subset of characters and their corresponding ASCII values are shown in the table in the image.
ASCII characters can also be represented by hexadecimal (base 16) numbers. According to the ASCII character encoding, which of the following characters is represented by the hexadecimal (base 16) number 6E16
n
N
E
k
30s - Q9
Refer to the ASCII table. Which ASCII character is represented by the decimal (base 10) number 72?
C
H
r
7
30s - Q10
Which of the following is a true statement about data compression?
Sending a compressed version of a file ensures that no one can read the contents of the file except for the intended recipient.
Data compression is only useful for files being transmitted over the Internet.
Regardless of the compression technique being used, once a data file is compressed, it cannot be restored back to its original state.
There are trade-offs involved in choosing a compression technique for storing and transmitting data.
30s - Q11
A student is transferring photos from her camera to her computer. The student notices that the saved photos on her computer are lower quality than the original raw photo on her camera.
Which of the following could be a possible explanation for the difference in image quality?
The saved image files were compressed with a lossless compression technique.
The saved image files were not compressed properly.
Some information is lost every time a file is saved on a computer.
The saved image files were compressed with a lossy compression technique.
30s - Q12
Consider the following numbers:
The decimal value 1010
The binary value 10012
Hexadecimal value C16
Which of the following lists the numbers in order from least to greatest?
10012, 1010, C16
1010, C16, 10012
1010, 10012, C16
C16, 10012, 1010
30s - Q13
A computer program uses 3 bits to represent integers. When the program adds the decimal (base 10) numbers 6 and 2, the result is 0. Which of the following is the best explanation for this result?
A round-off error occurred.
The result was affected by lossy data compression.
An off-by-one error occurred.
An overflow error occurred.
30s - Q14
The RGB encoding scheme encodes a color using 24 bit sequences. The first 8 bits encode the amount of red in the color, the next 8 bits encode the amount of green in the color, and the last 8 bits encode the amount of blue in the color.
Which of the following is a true statement about the color encoded by this binary sequence:
1110 1001
0111 1100
0000 1111
This color is mostly red.
This color has no blue in it.
This color is mostly blue.
This color is mostly green.
30s - Q15
Compression algorithms have tradeoffs. More compression can mean less storage and faster speeds but also reduced quality. Which of the following is a benefit of LossLESS over lossY compression?
A lossless compression algorithm typically provides a greater reduction in the number of bits stored or transmitted than does a lossy compression algorithm.
A lossless compression algorithm can guarantee that compressed information is kept secure, while a lossy compression algorithm cannot.
A lossless compression algorithm can guarantee reconstruction of original data, while a lossy compression algorithm cannot.
A lossless compression algorithm typically allows for faster transmission speeds than does a lossy compression algorithm.
30s
