J277 Paper 2 Booster

Presentation

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Computers

•

10th Grade

•

Practice Problem

•

Easy

Ollie Woods

Used 7+ times

FREE Resource

50 Slides • 14 Questions

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...

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

Match

Match the data type to the correct value!

String

Integer

Float

Boolean

Character

"01794502502"

01794502502

57.75

False

"f"

Reorder

Reorder the following to make the correct for loop syntax:

for

in range

(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!