69. OCR A Level (H446) SLR12 – 1.3 PageRank algorithm revisited

What is the primary focus of the video?

• The theory of relativity

• The history of the internet

• Applying the PageRank algorithm

• Creating web pages

Answer explanation

The primary focus of the video is applying the PageRank algorithm, as mentioned in the answer choices. This choice stands out as the correct focus of the video.

What is the dampening factor 'd' typically set to in the PageRank algorithm?

• 0.95

• 0.5

• 0.85

• 1

Answer explanation

The dampening factor 'd' in the PageRank algorithm is typically set to 0.85, which helps balance between the importance of the current page and the importance of the pages linking to it.

What is the value of 1 minus the dampening factor 'd'?

• 0.15

• 0.35

• 0.05

• 0.25

Answer explanation

The value of 1 minus the dampening factor 'd' is 1 - d = 1 - 0.85 = 0.15. Therefore, the correct choice is 0.15.

How many external links does Page A have?

• 3

• 2

• 4

• 1

Answer explanation

Page A has 2 external links, which is the correct answer choice.

What initial PageRank values are set for each page?

• 0

• 0.5

• 1

• 1.5

Answer explanation

The initial PageRank values set for each page are 1.

How many iterations of the algorithm are suggested to see the values begin to settle down?

• 10

• 50

• 100

• 200

Answer explanation

100 iterations are suggested to see the values begin to settle down, as mentioned in the correct answer choice.

What does the size of each circle in the visualization represent?

• The number of pages linking to it

• Its alphabetical order

• The number of pages it links to

• Its PageRank value

Answer explanation

The size of each circle in the visualization represents the number of pages linking to it, making it the correct choice.

What is the essence of the PageRank algorithm?

• The more content on the page, the more important it is

• The older the page, the more important it is

• The more pages that link to your page, the more important it is

• The more pages a page links to, the more important it is

Answer explanation

The essence of the PageRank algorithm is that the more pages that link to your page, the more important it is, which is the correct choice.

What is the result of the calculation 1 times 0.85 divided by 2?

• 0.725

• 0.625

• 0.525

• 0.425

Answer explanation

To find the result, multiply 1 by 0.85 to get 0.85, then divide by 2 to get 0.425. Therefore, the correct answer is 0.425.

What does the PageRank algorithm need to be run for at least 100 iterations?

• To ensure accuracy

• To comply with web standards

• To increase the page's visibility

• To finalize the web design

Answer explanation

The PageRank algorithm needs to be run for at least 100 iterations to ensure accuracy.