Digital Information Flashcards
Which number system is used to store information digitally in a computer?
Binary (base 2)
How many different digits are used in the Hexadecimal number system?
16
What is the decimal value of 1101 (subscript 2)?
13 (subscript 10)
How many different values can be represented using 4 bits?
16 different values
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?
255 (subscript 10)
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.
What best describes the result of using 64-bit integers instead of 32-bit integers?
2 (subscript) 32 times as many values can be represented
Which of the following is a true statement about data compression?
A. Data compression is only useful for files being transmitted over the Internet.
B. Regardless of the compression technique being used, once a data file is compressed, it cannot be restored back to its original state.
C. Sending a compressed version of a file ensures that no one can read the contents of the file except for the intended recipient.
D. There are trade-offs involved in choosing a compression technique for storing and transmitting data.
D
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 lossy compression technique.
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
What is 6E (sub 16)?
16 x 6 + 14 = 110
What is 5F (sub 16)?
16 x 5 = 80 + 15 = 95
