Creative Development and Data | Quiz 1

How many values can a binary digit store?

• One of two values at a time--0 or 1

• Any ten values at a time

• Any two values at a time

• One of ten values at a time--0 through 9

An algorithm will be used to output true if every number in a list is either a 4 or a 5, and false otherwise. There are two proposals for the algorithm:

Algorithm 1: Set 'only45' to false. Iterate through each number in the list. If the number is not equal to 4 and not equal to 5, set 'only45' to false. Otherwise, set 'only45' to true.

Algorithm 2: Set 'only45' to true. Iterate through each number in the list. If the number is not equal to 4 and not equal to 5, set 'only45' to false.

Which of these statements are true about these algorithms?

I. Algorithm 1 does not work on lists where a number other than 4 and 5 occurs before the last number.

II. Algorithm 2 does not work on lists which contain entirely 4s or 5s.

• I only

• II only

• I and II

• Neither I nor II

A bunch of computer scientists take over an island and start their own country. They need the license plates to use binary numbers. There is space for 7 digits on each license plate and the first plate starts at 0000000. How many unique license plates can their country support?

Consider a computer that uses 5 bits to represent nonnegative integers and uses all 5 bits to represent the value. Which of the following operations would result in integer overflow? There is at least one correct answer.

• 8 ⛌ 4

• 12 + 2

• 18 + 14

• 8 + 4

• 12 ⛌ 2

VSCII is a character encoding scheme developed in the 1990s in order to encode text written in Vietnamese. VSCII uses one byte to encode each character. The binary data 1010111010111000 is a VSCII encoding of a single Vietnamese word. How many characters are encoded in that binary data?

• 1

• 2

• 8

• 16

A programmer is writing a software application about birds that will use a variety of data sources. They need to understand which data sources are analog so that they can think carefully about the process of converting the analog data into digital data. Which of these data sources is analog?

• The mean length of the songs sung by a particular bird

• The number of reported sightings of a particular bird species in each zip code

• The altitude of a bird as it flies through the sky

• A list of birds that are most commonly seen in a particular park

Compression algorithms vary in how much they can reduce the size of an image. Which of the following would likely be the easiest to compress?

• 
• 
• 
• 

Remy is setting up a cooking blog and is deciding whether to use lossy compression algortihms on her photos of yummy meals. What is a good explanation of the benefits and drawbacks to lossy compression algorithms?

• They will reduce the file size, but the images will be lower quality

• They reduce the file size, but they can only reduce up to 10% of the file size

• They reduce the file size, but the compression is irreversible

• They download faster, but the file size is not reduced

When writing binary data, we often put a space between each byte to make it easier for humans to read. Consider the binary data 00100110010100001010100100011010. Which choice puts a space after each byte?

• 00 10 01 10 01 01 00 00 10 10 10 01 00 01 10 10

• 0010 0110 0101 0000 1010 1001 0001 1010

• 00100110 01010000 10101001 00011010

• 0010011001010000 1010100100011010

The Apple iPhone includes a settings menu where you can toggle various accessibility options on or off. What is the minimum number of bits that can represent those 2 options?