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.
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