A-Level Aqa Computer
Science Paper 2 Latest
Update
(Data) Skew - ✔✔✔ANSWER-The result of sending signals down parallel wires
over long distances.
SELECT - ✔✔✔ANSWER-The SQL command used to *extract* data from a
database.
Selection - ✔✔✔ANSWER-This is when an if statement or select case is used to,
for example, check the value of a variable.
,Serial (Data Transmission) - ✔✔✔ANSWER-A type of data transmission that
involves a single wire meaning only one signal can be sent at once.
Server - ✔✔✔ANSWER-A computer that is configured to provide a service to the
clients.
(John) Von Neumann (Architecture) - ✔✔✔ANSWER-The type of computer
architecture where data and instructions are stored in the same memory location.
(Object) Constructor - ✔✔✔ANSWER-A procedure that is called once when an
object is created, parameters can be passed into this procedure.
(Object) Destructor - ✔✔✔ANSWER-A procedure that is called once when an
object is destroyed, parameters cannot be passed into this procedure.
(Object) Instantiation - ✔✔✔ANSWER-When an object is first created using the
'new' keyword.
(The) (Processor) Instruction Set - ✔✔✔ANSWER-All of the different operations
that a processor can perform, it is usually different for each processor.
(The) Operating System - ✔✔✔ANSWER-It hides the complexity of the hardware
from the user.
(The) stored program concept - ✔✔✔ANSWER-Instructions in the form of
machine code are stored in main memory and are fetched and executed one at a
time.
,# - ✔✔✔ANSWER-In assembly language, what symbol is used to denote that a
number used in the operand is a value instead of a memory location.
1000 (Bytes) - ✔✔✔ANSWER-How many bytes are there in a Kilobyte?
1000000 (Bits) - ✔✔✔ANSWER-How many bits are there in a megabit?
1024 (Bytes) - ✔✔✔ANSWER-How many bytes are there in a Kibibyte?
1600 (Hz) - ✔✔✔ANSWER-If you are converting sound that has a highest
frequency of 800Hz, what is the minimum sample rate you should choose?
25 - ✔✔✔ANSWER-The port reserved for SMTP.
65 - ✔✔✔ANSWER-The denary ASCII value for a capital 'A'.
7 (bits) - ✔✔✔ANSWER-The number of bits used by ASCII.
8 (Bits) - ✔✔✔ANSWER-How many bits are there in a byte?
8 (bits) - ✔✔✔ANSWER-The number of bits used by extended ASCII.
80 - ✔✔✔ANSWER-The port reserved for HTTP.
, a? - ✔✔✔ANSWER-A regular expression that represents either one or zero letter
'a's.
a* - ✔✔✔ANSWER-A regular expression that represents any number, including
zero, of the letter 'a'.
a+ - ✔✔✔ANSWER-A regular expression that represents any number, *not*
including zero, of the letter 'a'.
a|b - ✔✔✔ANSWER-A regular expression that represents either the letter 'a' or the
letter 'b'.
Absolute (Error) - ✔✔✔ANSWER-When you calculate a value, it is the difference
between the calculated result and the expected result.
Abstraction - ✔✔✔ANSWER-Hiding data that the user does not need to see.
Accessor (Method) - ✔✔✔ANSWER-A type of method used in a class that is used
to return an attribute that is private.
Adjacency List - ✔✔✔ANSWER-A table where on the left there is a list of all the
nodes and on the right there is a list of the nodes that the corresponding node is
connected to.
This should be used when you have a lot of nodes but not many connections.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller NURSING2EXAM. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
