J277 Paper 2 Booster

Poll

First question - did you actually revise for Paper 1?

• Yes, the night before

• Yes, with a number of proper sessions

• I looked at the textbook/internet...

• No

Multiple Choice

The exam asks: "explain what abstraction is and why it helps with writing algorithms". Which answer will get you two marks?

• "Abstraction is the process of removing unnecessary information"

• "Abstraction is the process of breaking down a problem into parts. It helps us to understand the basic steps needed to solve the problem."

• "Abstraction is the process of removing unnecessary information from a problem. This allows us to focus on only the information we need to include in the algorithm."

• "Abstraction is the process of removing unnecessary information from a problem. This allows us to make our algorithm shorter."

Multiple Choice

Should you leave anything blank?

• Yes, because I'll get minus marks if I get something wrong

• No, because even if I don't know the entire solution I might get marks for the bits I know

• No, because I might get lucky

• Yes, so I can focus on the questions that I do know

Match

Match the flowchart symbol with the correct term.

• Input/Output

• Terminator

• Decision

• Process

• Subprogram

Parallelogram

Oval (sort of)

Diamond

Rectangle

Rectangle with two vertical lines

• Parallelogram

• Oval (sort of)

• Diamond

• Rectangle

• Rectangle with two vertical lines

Match

Match the data type to the correct value!

• String

• Integer

• Float

• Boolean

• Character

"01794502502"

01794502502

57.75

False

"f"

• "01794502502"

• 01794502502

• 57.75

• False

• "f"

Reorder

Reorder the following to make the correct for loop syntax:

• for

• i

• in range

• (5)

• :

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

An added quirk with strings...

OCR REFERENCE LANGUAGE ONLY (for reading!):

subject = "Computer"

subject.substring(x, i) gives starting position and how many characters - so subject.substring(3, 5) = "puter"

subject.left(x) returns the first x letters of a string - subject.left(4) = "Comp"

subject.right(x) returns the last x letters of a string - subject.right(3) = "ter"

Everything else is the same as Python!

Multiple Choice

Making someone type their password in twice is a form of...

• Verifcation

• Validation

• Sanitisation

• Authentication

Multiple Choice

Which one of these is not a form of authentication?

• Password

• Facial recognition

• Making sure your username is a certain length

• Typing a code in from your phone

Categorize

Options (12)

79

16

34

0

-1

80

85

-5

192

Eight

6?

@?!*

My program needs to check that I typed in the integer value of marks for your mock (out of 80) properly. Categorise the data...

Valid

Boundary

Invalid

Erroneous

Multiple Choice

Python is an example of...

• Low level language

• High level language

• Machine code

• Assembly language

Open Ended

Any questions/anything you want to go over still?!