GCSE OCR Computer Science Paper 2 Unofficial Markscheme

150 plus for a 9?, possible since the papers were easy

How many marks can the grade boundaries go up because it was easy

Here are some of the answers I remember
1)Sampling: using a digital analogue converter to convert the sound into processable data, the amplitude of sound is recorded at regular intervals
2) Sample frequency increases size and quality of file
3) bitmap, uses binary code to represent each pixel, the larger the binary code, the more colours it can represent.
Hexadecimal was 163
Other calculation was 91
For the final question, you HAD to use a while loop to get anything above 6/8 I think
Logic gate was an OR, not an and. Answers were 0111
DEFENSE DESIGN: AUTHENTICATION AND VALIDATION
OCR FC QUESTION: the things I put into the gaps were: nogoalscount, = nogoalscount+1 , print (nogoalscount)
Ways of translating high level: compilers and interpreters
The data type was a real as it used decimals
Lines 6 to 8 of the bubble sort code stored each value as a temporary variable to swap the 2 values
Merge sort
Linear sort
Data is represented in binary because it only has 2 states
ADD MORE TO THIS ))

Last years paper was also easy

What did you mean by Linear sort that’s a search isn’t it ? I think for the two sorts it was Insertion and Merge

IIRC grade boundaries are set through comparative testing, so will be very similar to last year but possibly 2/3 marks higher.

total = 0
WHILE total != 8
height = INPUT("Enter height in cm: ") as INT
IF height >= 140 THEN
OUTPUT("Allowed to ride.")
total = total + 1
ELSE
IF height >= 120 THEN
adult = INPUT("Adult present? ") as BOOLEAN
IF adult == TRUE THEN
OUTPUT("Allowed to ride.")
total = total + 1
ELSE
OUTPUT("Not allowed to ride.")
ENDIF
ELSE
OUTPUT("Not allowed to ride")
ENDIF
ENDIF
ENDWHILE

Yeah sorry you're right, was very tired when I made this, your answers are right

i think you got mixed up with the binary search question, the other search to binary was linear😂

Paper 2 was light work, I found paper 1 more difficult personally.

Stuff on Check Digits was a big oof

What was the correction for the logic error? I got something like 2 MOD == 0
High level language examples, I got interpreter and compiler
Defensive design, I said maintaining the code, comments and variables. Now I'm starting to think that it should have been input sanitisation and validation
When you had to convert hex to denary (A3), did u get 13 or 103? I added 10 and 3, but I'm not sure if that's right.

i got confused with interpreter and compiler and said that compiler translates it all in one go and interpreter does it bit by bit? did i guess correctly

Tha was nice a nice paper I was surprised at the lack of questions on sound

Here are some of the answers I remember
1)Sampling: using a digital analogue converter to convert the sound into processable data, the amplitude of sound is recorded at regular intervals
2) Sample frequency increases size and quality of file
3) bitmap, uses binary code to represent each pixel, the larger the binary code, the more colours it can represent.
Hexadecimal was 163
Other calculation was 91
For the final question, you HAD to use a while loop to get anything above 6/8 I think
Logic gate was an OR, not an and. Answers were 0111
DEFENSE DESIGN: AUTHENTICATION AND VALIDATION
OCR FC QUESTION: the things I put into the gaps were: nogoalscount, = nogoalscount+1 , print (nogoalscount)
Ways of translating high level: compilers and interpreters
The data type was a real as it used decimals
Lines 6 to 8 of the bubble sort code stored each value as a temporary variable to swap the 2 values
Merge sort
Linear sort
Data is represented in binary because it only has 2 states
ADD MORE TO THIS ))

The second question. The one with the pseudocode /algorithm Stressed me out so much, Spent about 20 mins trying to resolve it but kept going back and rewriting the whole answer, in the end, crossed it all out moved on, But yeah I crashed and burned for the rest of the exam worst exam moment ever. I did go back at the end and put an answer but I was so concentrated on that question for the rest of the exam I forgot everything:/