CAMBRIDGE IGCSE COMPUTER
SCIENCE PAPER #2 EXAM QUESTIONS
WITH COMPLETE ANSWERS
Control Unit (CU) - Answer-The part of the CPU that controls the flow of data
Immediate Access Store (IAS) - Answer-Holds the instructions and data that is ready to
be used by the CPU
Arithmetic Logic Unit (ALU) - Answer-The part of the central processing unit that
performs arithmetic computations and logical operations.
Registers - Answer-Small, high-speed storage locations that temporarily hold data and
instructions.
Input/Output - Answer-Allows interaction with the computer. Instructions are processed
from and to them in the CPU
Data Bus - Answer-The lines on the system bus that the CPU uses to send and receive
data.
Address Bus - Answer-Used to transfer information about where data should reside in
memory
Control Bus - Answer-Carries command and control signals to and from every other
component of a computer.
buses - Answer-A component of the Von Neumann Architecture. This component is
responsible for carrying data from one part of the CPU to another. There are three
specific types of this component.
The stored program concept - Answer-The idea that instructions and data of many types
can be stored in memory as numbers, leading to the stored-program computer.
Fetch-Execute Cycle - Answer-the basic process performed by the CPU. On each cycle
the CPU fetches the next instruction from RAM, interprets it and executes it.
operating system - Answer-the software that supports a computer's basic functions,
such as scheduling tasks, executing applications, and controlling peripherals.
Interrupts - Answer-Signals that inform the OS that an event has occurred and is in
need of immediate attention
SCIENCE PAPER #2 EXAM QUESTIONS
WITH COMPLETE ANSWERS
Control Unit (CU) - Answer-The part of the CPU that controls the flow of data
Immediate Access Store (IAS) - Answer-Holds the instructions and data that is ready to
be used by the CPU
Arithmetic Logic Unit (ALU) - Answer-The part of the central processing unit that
performs arithmetic computations and logical operations.
Registers - Answer-Small, high-speed storage locations that temporarily hold data and
instructions.
Input/Output - Answer-Allows interaction with the computer. Instructions are processed
from and to them in the CPU
Data Bus - Answer-The lines on the system bus that the CPU uses to send and receive
data.
Address Bus - Answer-Used to transfer information about where data should reside in
memory
Control Bus - Answer-Carries command and control signals to and from every other
component of a computer.
buses - Answer-A component of the Von Neumann Architecture. This component is
responsible for carrying data from one part of the CPU to another. There are three
specific types of this component.
The stored program concept - Answer-The idea that instructions and data of many types
can be stored in memory as numbers, leading to the stored-program computer.
Fetch-Execute Cycle - Answer-the basic process performed by the CPU. On each cycle
the CPU fetches the next instruction from RAM, interprets it and executes it.
operating system - Answer-the software that supports a computer's basic functions,
such as scheduling tasks, executing applications, and controlling peripherals.
Interrupts - Answer-Signals that inform the OS that an event has occurred and is in
need of immediate attention
