Data and Algorithms quiz

Question 1

What is 'data' in computing?

Accepted Answer

Raw facts and figures a computer can store and process

Answer

Only pictures stored on a phone

Answer

A type of computer virus

Answer

The speed of an internet connection

Question 2

What is an algorithm?

Accepted Answer

A step-by-step set of instructions to solve a problem

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A piece of computer hardware

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A type of internet cable

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A social media app

Question 3

What is the difference between data and information?

Accepted Answer

Data is raw facts; information is processed, meaningful data

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They mean exactly the same thing

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Information is always numbers; data is always words

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Data is stored online; information is stored offline

Question 4

Why do computers need algorithms to learn from examples?

Accepted Answer

So they can find patterns in examples and predict new cases

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Because algorithms make computers run faster

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To save battery power

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So computers can connect to WiFi

Question 5

What is a dataset?

Accepted Answer

A collection of related data organized together

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A single number

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A computer program

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A type of password

Question 6

In a data table, what is a 'feature' (or column)?

Accepted Answer

A characteristic of each item, shown as a column

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The name of the computer

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An error in the data

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The final answer of a program

Question 7

What is a 'label' in machine learning?

Accepted Answer

The correct answer attached to an example

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A sticker on the computer

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A type of algorithm

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The speed of learning

Question 8

What is the difference between a list and a single value in Python?

Accepted Answer

A single value holds one item; a list holds many items in order

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Lists can only hold words, not numbers

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A single value is faster than any list

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They are exactly the same in Python

Question 9

What does a sorting algorithm do?

Accepted Answer

Arranges data into a particular order

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Deletes unwanted data

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Connects computers together

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Encrypts secret messages

Question 10

How does a simple linear search work?

Accepted Answer

It checks each item one by one until it finds the target

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It jumps straight to the middle item

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It only works on sorted lists

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It searches all items at the same time

Question 11

How is binary search different from linear search?

Accepted Answer

Binary search needs a sorted list and checks the middle, halving the search

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Binary search is always slower than linear search

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Binary search works only on unsorted lists

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They are exactly the same algorithm

Question 12

What is bias in data, and why is it a problem?

Accepted Answer

Data that unfairly represents some groups, causing unfair results

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Data that is stored too slowly

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A way to make computers faster

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Data with too many numbers

Question 13

Give an example of how biased training data could cause an unfair AI.

Accepted Answer

Face recognition trained mostly on one skin tone fails for others

Answer

A computer running out of storage space

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A program with a spelling mistake

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An app that uses too much battery

Question 14

What is 'training data' versus 'test data'?

Accepted Answer

Training data teaches the model; test data checks it on unseen examples

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Both are used only to teach the model

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Test data is used before training data

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They must always be the same data

Question 15

What does it mean for a model to 'overfit'?

Accepted Answer

The model memorizes training data but fails on new data

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The model is too small to learn anything

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The model runs out of memory

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The model trains too quickly

Question 16

What is the difference between numerical data and categorical data?

Accepted Answer

Numerical data is measurable numbers; categorical data is labels or groups

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Numerical data is always text; categorical is always numbers

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They are two names for the same thing

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Categorical data can only be true or false

Question 17

What is the 'mean' (average) of a set of numbers?

Accepted Answer

The sum of the numbers divided by how many there are

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The biggest number in the set

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The middle number when sorted

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The number that appears most often

Question 18

What is the 'median' of a dataset?

Accepted Answer

The middle value when the data is sorted

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The sum of all values

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The most frequent value

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The largest value

Question 19

What is the 'mode' in a set of data?

Accepted Answer

The value that appears most often

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The middle value

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The average of all values

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The difference between largest and smallest

Question 20

Why is cleaning data important before analyzing it?

Accepted Answer

Errors and missing values can lead to wrong conclusions

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Cleaning makes the computer run cooler

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It deletes all the data permanently

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It is only needed for pictures

Question 21

What is a flowchart and how does it relate to algorithms?

Accepted Answer

A diagram of an algorithm's steps using boxes and arrows

Answer

A list of computer passwords

Answer

A type of programming language

Answer

A chart of internet speeds

Question 22

What is a loop in programming and why is it useful for data?

Accepted Answer

A way to repeat instructions, useful for going through data

Answer

A way to delete a program

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A type of computer screen

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A method to slow down a computer

Question 23

What is a conditional ('if') statement used for?

Accepted Answer

To make decisions by running code only when a condition is true

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To repeat code forever

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To store many numbers

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To connect to the internet

Question 24

What is 'pattern recognition' in the context of AI?

Accepted Answer

Detecting regularities or repeated structures in data

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Storing data on a hard drive

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Deleting old files

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Typing faster on a keyboard

Question 25

What is the difference between supervised and unsupervised learning?

Accepted Answer

Supervised uses labeled examples; unsupervised finds patterns without labels

Answer

Supervised has no data; unsupervised has data

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They are both the same thing

Answer

Unsupervised always needs a human for every answer

Question 26

What does 'classification' mean in machine learning?

Accepted Answer

Putting data into one of several categories

Answer

Adding up numbers in a dataset

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Sorting numbers from low to high

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Deleting unwanted data

Question 27

What is a graph (chart) used for when working with data?

Accepted Answer

To show data visually so patterns are easier to see

Answer

To permanently store data

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To write computer code

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To connect to the internet

Question 28

Why should we protect people's privacy when collecting data?

Accepted Answer

Personal data can harm people if misused or leaked

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Privacy makes computers run faster

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It is only important for games

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Privacy is not needed for digital data

Question 29

What is 'big data'?

Accepted Answer

Extremely large, complex datasets needing special tools

Answer

A single very large number

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Data stored on one phone

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A type of fast typing

Question 30

How does an algorithm decide which video or post to recommend to you?

Accepted Answer

By using data on what you and similar users liked to predict your interests

Answer

By picking videos completely at random

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By choosing the newest video only

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By asking you to type your favorite

Test yourself