GCSE OCR Computer Science 2017 Unofficial Mark Scheme

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Ggjjfvjh
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#1
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No-one else is doing this and I assume quite a few are interested.
Comment any question or answers that you remember and I'll make a list of them on original post for all to see.

Question 1:
[Working on it =)]
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legodmaker
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Name an input device a disabled person can use for a satnav?

What is a computer system?

A database is a "persistent organised store of data" what does this mean?

Name two other types of iteration other than a for loop?

Name two other features a DBMS has apart from validation?

What is the best data type for this XXXID (Answer is Integer)

Look at X >= 0 and X <= 100 input a bit of Borderline Data and a bit of Invalid Data?

What are the ethical and legal considerations of autonomous cars?

What network policies should OCR accounting adopt?

What is 34? and 156 in hexadecimal?
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jamesballs
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(Original post by legodmaker)
What is 34? and 156 in hexadecimal?
And 58 in hexadecimal. 58 in hex is 3A, 34 in hex is 22 and 156 in hex is 9C.

Other questions I can remember:

Write an algorithm that generates a random number, asks the user to guess that number, if the user is correct then the algorithm outputs "congratulations" and the algorithm then ends but if they are not, tell the user if the number is lower or higher. The user only has 10 attempts to guess the number - after this, the algorithm ends. Iteration must be used.

Why does a Sat Nav need secondary storage?

Why does a Sat Nav need Solid State storage instead of a Magnetic Hard Disk? (or something like that)

Complete the algorithm above (question talking about the unfinished algorithm that included a for loop. The answer for the first part was 'Count' I believe)

Can't remember any more at the moment but I will update if I remember any.
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Kronixion
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(Original post by legodmaker)
Name an input device a disabled person can use for a satnav?

What is a computer system?

A database is a "persistent organised store of data" what does this mean?

Name two other types of iteration other than a for loop?

Name two other features a DBMS has apart from validation?

What is the best data type for this XXXID (Answer is Integer)

Look at X >= 0 and X <= 100 input a bit of Borderline Data and a bit of Invalid Data?

What are the ethical and legal considerations of autonomous cars?

What network policies should OCR accounting adopt?

What is 34? and 156 in hexadecimal?
For the data type question, the answer is string because the ID was like 0001, a series of numbers. This cannot be an integer.
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Stian_Hazelgrove
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For the last algorithm question:

number = randInt(1, 100)
attempts = 0

guess = INPUT("Guess a number between 1 and 100"

WHILE guess != number:
IF attempts >= 10:
PRINT("You failed.")
BREAK
IF guess < number:
PRINT("Guess Higher!")
attempts = attempts + 1
CONTINUE
IF guess > number:
PRINT("Guess Lower!")
attempts = attempts + 1
CONTINUE

ELSE:
PRINT("congratulations")
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Devestation
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Q1) What is a computer system?
-A system containing electronic devices that have software and hardware working together
-It is an electronic data processing machine that can take inputs and output results
Q2) Why does a computer system need input devices?
-To have data to process
Q3) Give an example of an input device for the sat nav for a disabled person and explain how it is useful.
-Keyboard.
Q4) Why does the sat nav need a secondary storage device?
-store maps, previous locations etc.
Q5) Why solid state storage?
-Portable-small, light
-withstand movement, no moving parts
Q6) Why are the commands stored as binary?
-1 and 0 can easily be represented via on and off siganls. It allows easy simple logic gates. It allows less error as there are only two values
Q7) Name a task carried out by the CPU.
-Mention of either fetch - decode - execute cycle I suppose?
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gracel0ng_
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I Put Braille keyboard for the sat nav question and then sat the rest of the exam contemplating if and how blind people can drive ...
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texet
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(Original post by gracel0ng_)
I Put Braille keyboard for the sat nav question and then sat the rest of the exam contemplating if and how blind people can drive ...
Exactly what I did, but then I changed it to voice recogniser.
I also put Keyboard in brackets under where it said the marks.
So I'm fine.
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Ggjjfvjh
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Thanks for your input guys, I will begin updating the post to make it neater; ya'll have good memory haha
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dontknowyolo
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No one is adding the marks per question, this would be helpful as I want to know a rough estimate of how many marks I got
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foobarred
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lol this is wrong hahahahahaha they didn't ask for a number between 1 and 100 they said any random random number, next u haven't ended any ifs so this would be invalid , and its too much like python. BUT TBH i can't say much i made mine in a infinity loop by mistake i forgot to add counter i asked my teacher she said id still get like 4/5 so yay
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username3251038
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(Original post by legodmaker)
Name an input device a disabled person can use for a satnav?

What is a computer system?

A database is a "persistent organised store of data" what does this mean?

Name two other types of iteration other than a for loop?

Name two other features a DBMS has apart from validation?

What is the best data type for this XXXID (Answer is Integer)

Look at X >= 0 and X <= 100 input a bit of Borderline Data and a bit of Invalid Data?

What are the ethical and legal considerations of autonomous cars?

What network policies should OCR accounting adopt?

What is 34? and 156 in hexadecimal?
"What is the best data type for this XXXID (Answer is Integer)"

The answer was string. It was a trick question, it had 0s before the number. If you use an integer and you have 0s before a number, they'll get cancelled out. With a string, they wont.
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emdad_muhsin
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I have the official mark scheme:
1a) Hardware, Software,
1bi) Input: to allow instructions/data/commands/destination to be input/entered/given/example
1bii) Microphone - To let user say destination.
Touch Screen - Let user touch the screen
1ci) Long term/permanent/non-volatile/persistent storage
1cii) Durable/robust/no moving parts
1di) Fetch data/instructions
Decode data/instructions
Execute instructions
1dii) Computers are made of logic gates/transistors/switches
Can only be states / on or off/ 1 or 0 / high or low
2ai) Tags, hyperlinks, location, structure, layout instructions, formatting, metadata
2aii) All webpages are made usign HTML
All browsers read/understand HTML
2bi) 3A and 9C
2bii) Easier to remember/ to enter/to read
Faster to enter/read
Quick to convert into binary
2c) Compression makde the file size smaller/takes up less space
File can be downloaded/ streamed mroe quickly by the end user//website will load more quickly
Files upload more quickly / lower bandwidth
2d) URL/Domain name is sent to the DNS
DNS has a list /database/table of URLs and matching IP addresses
3a) COUNT
TOTAL/QUANTITY OR TOTAL/COUNT OR TOTAL/10
3b) A location in memory
A value/data that cannot be changed ( whilst the program is running )
3c) Real/Float/Single/Double/Decimal
Can be decimal/fractional/ not a whole number
3d) While/ do while
Repeat/ Repeat until/do unitl/ Until
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