data rep

Question 1

What is data representation?

Answer 1

The way in which data is stored, processed, and communicated in a computer system.

Question 2

True or False: Computers understand data in the form of binary.

Answer 2

True

Question 3

What is binary?

Answer 3

A base-2 numeral system that uses two symbols, typically 0 and 1.

Question 4

Complete the sentence: In binary, the digit 1 represents ___ and the digit 0 represents ___ .

Answer 4

on; off

Question 5

How many bits are in a byte?

Answer 5

8 bits

Question 6

What is a bit?

Answer 6

The smallest unit of data in computing, representing a binary value of 0 or 1.

Question 7

What is the decimal equivalent of the binary number 1010?

Answer 7

10

Question 8

True or False: Hexadecimal is a base-10 number system.

Answer 8

False

Question 9

What is the base of the hexadecimal number system?

Answer 9

16

Question 10

What are the symbols used in hexadecimal?

Answer 10

0-9 and A-F

Question 11

Convert the binary number 1111 to decimal.

Answer 11

15

Question 12

What does ASCII stand for?

Answer 12

American Standard Code for Information Interchange

Question 13

How many characters can be represented by a single byte using ASCII?

Answer 13

256 characters

Question 14

True or False: Unicode can represent characters from multiple languages.

Answer 14

True

Question 15

What is the primary purpose of data compression?

Answer 15

To reduce the size of data for storage and transmission.

Question 16

What is lossy compression?

Answer 16

A method of data compression that reduces file size by removing some data, which may affect quality.

Question 17

What is lossless compression?

Answer 17

A method of data compression that allows the original data to be perfectly reconstructed from the compressed data.

Question 18

Which of the following is an example of a lossy compression format? (A) PNG (B) JPEG (C) GIF

Answer 18

B) JPEG

Question 19

What does RGB stand for in color representation?

Answer 19

Red, Green, Blue

Question 20

How are colors represented in a digital image?

Answer 20

Using combinations of RGB values.

Question 21

True or False: A pixel is the smallest unit of a digital image.

Answer 21

True

Question 22

What is the primary function of a graphics card?

Answer 22

To render images and video for display.

Question 23

What does DPI stand for?

Answer 23

Dots Per Inch

Question 24

What is the purpose of DPI in printing?

Answer 24

To measure the resolution of printed images.

Question 25

What is a vector graphic?

Answer 25

An image that is created using mathematical formulas, allowing it to be scaled without losing quality.

Question 26

What is a raster graphic?

Answer 26

An image that is made up of pixels and can lose quality when scaled.

Question 27

What does the term 'metadata' refer to?

Answer 27

Data that provides information about other data.

Question 28

True or False: Metadata can include information such as the author, date created, and file size.

Answer 28

True

Question 29

What is the purpose of file extensions?

Answer 29

To indicate the file type and format to the operating system.

Question 30

Which of the following is a common image file extension? (A) .exe (B) .jpg (C) .txt

Answer 30

B) .jpg

Question 31

What is the role of a codec?

Answer 31

To encode and decode digital data, especially for audio and video.

Question 32

True or False: A container format is used to hold different types of data such as video, audio, and subtitles.

Answer 32

True

Question 33

What does the term 'bit depth' refer to?

Answer 33

The number of bits used to represent the color of a single pixel.

Question 34

How does higher bit depth affect image quality?

Answer 34

It allows for more colors and smoother gradients.

Question 35

What is a sample rate in audio representation?

Answer 35

The number of samples of audio carried per second, measured in Hertz (Hz).

Question 36

True or False: Higher sample rates result in better audio quality.

Answer 36

True

Question 37

What is the purpose of a binary file?

Answer 37

To store data in a format that is not easily readable by humans, typically for efficiency.

Question 38

What is a common text file format?

Answer 38

.txt

Question 39

What is the difference between structured and unstructured data?

Answer 39

Structured data is organized and easily searchable, while unstructured data lacks a predefined format.

Question 40

What is an example of structured data?

Answer 40

Data in a relational database.

Question 41

True or False: A database is a collection of related data.

Answer 41

True

Question 42

What is data encoding?

Answer 42

The process of converting data into a specific format for efficient transmission or storage.

Question 43

What does the term 'data integrity' refer to?

Answer 43

The accuracy and consistency of data over its lifecycle.

Question 44

What is the significance of error checking in data transmission?

Answer 44

To ensure that data is transmitted accurately and without corruption.

Question 45

What is a checksum?

Answer 45

A value used to verify the integrity of a data set.

Question 46

What is the purpose of data visualization?

Answer 46

To represent data in a visual context, making it easier to understand and analyze.