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IGCSE COMPUTER SCIENCE (ALL) EXAM QUESTIONS WITH COMPLETE SOLUTIONS
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IGCSE COMPUTER SCIENCE (ALL) EXAM QUESTIONS WITH COMPLETE SOLUTIONS
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IGCSE COMPUTER SCIENCE (ALL)EXAM QUESTIONS WITH COMPLETE
SOLUTIONS
What is the definition of an Input Device? - Answer-Any device that allows a computer
to receive data from the outside world
How many types of scanners are there? - Answer-5
What type of scanner is used at airports to read passport pages? - Answer-2D
Scanners
What type of scanner uses gamma rays? - Answer-SPCET Scanners
What is the name of the input device that reads a series of dark and light lines of
varying thickness? - Answer-Barcode Reader
What does the light line represent in a barcode? - Answer-0
Where is the most common place that Barcode Readers are used? - Answer-
Supermarkets
What does QR stand for in QR Code? - Answer-Quick Response
How many times more data (approximately) can a QR code hold compared to a
barcode? - Answer-200
What are 3 automatic adjustments that a microprocessor in a digital camera make? -
Answer-Shutter speed, aperture size, size of image
What is the name of the cell that light passes through the lens onto in a digital camera?
- Answer-Light-sensitive cell
What determines the file size of a photograph? - Answer-Number of pixels
What are two external factors that affect the quality of the photograph? - Answer-Type
of lens and lighting
What is the name for the most common input device? - Answer-Keyboard
What do most computer systems use to prevent the microprocessor waiting for keys to
be pressed? - Answer-Keyboard buffer
,What injury are users prone to who do a lot of typing? - Answer-Repetitive Strain Injury
(RSI)
What are the two most common pointing devices? - Answer-Mouse and trackerball
Which port connects the mouse to the computer? - Answer-USB
What 3 common features do all mouses have? - Answer-2 buttons and a scroll wheel
What is the most common environment for where trackerballs are used? - Answer-
Control rooms
What is the name of the device that is used to input sound into a computer? - Answer-
Microphone
What is the name of the device that converts analogue data to digital data? - Answer-
Analogue to Digital Converter (ADC)
What are the 3 types of touchscreen? - Answer-Capacitive, Infra-red, Resistive
What general type of touchscreen allows users to utilise whilst wearing gloves or using
a stylus? - Answer-Resistive
What are the most common types of sensors? - Answer-Monitoring and Control
What is the name of the device that converts digital data to analogue data? - Answer-
Digital to Analogue Converter (DAC)
What component of a machine is responsible for controlling systems in control
applications? - Answer-Actuators
How would monitoring sensors be used in a hospital? - Answer-To monitor a patient's
vital signs
What are two ways that control sensors are used on the street? - Answer-Street lighting
and traffic light control
In street lighting, how long is a lamp left on or off for before readings are sampled
again? - Answer-30 minutes
Benefits of high level languages? - Answer-Easier to read and understand as the
language is closer to human language, easier to write in a shorter time, easier to debug
at the development stage, easier to maintain once in use
Examples of high level languages? - Answer-C++, Delphi, Java, Pascal, Python, Visual
basic.
, Why do people use low level languages - Answer-To make use of special hardware, to
make use of special machine-dependant instructions, to write code that doesn't take up
a lot of space in primary memory, to write code that performs tasks quickly
Advantages and disadvantages of machine code - Answer-difficult to understand,
programmers don't usually write in it, in binary (instructions that a computer
understands)
Define a compiler - Answer-A program that translates a program written in high level
language into machine code, translates one line at a time, distributed for general use,
compiled programs are used without the compiler.
Define an interpreter - Answer-A program that reads a statement from a program in a
high-level language, performs the action specified and then does the same with the next
statement over and over, doesn't produce a translated program, used when a program
is being developed, interpreted programs cant be used without the interpreter
What does an assembler do? - Answer-Translates a program in assembly language or
machine code so that it can be used by a computer to perform a required task,
distributed for general use, assembled program can be used without the assembler
Whats a syntax error? - Answer-Where a program statement doesn't obey the rules of
the programming language
Define a logic error - Answer-An error where the program doesn't do what the
programmer wanted it to do
What happens when a runtime error occurs - Answer-Error that occurs during the
execution of a program. Indicate bugs in the program or problems that the designers
had anticipated but couldn't do anything about. Running out of memory could cause a
runtime error.
HTML structure and presentation - Answer-HyperText Markup Language structure -
essential part of HTML, consisting of semantics and structural mark-up of the
documents.
Presentation - the style of the document - how the document will appear on the user's
computer screen.
ISP - Answer-Internet Service Provider - a company that provides a user with access to
the internet. They usually charge a monthly fee. The ISP will give a user an account and
an email address
IP - Answer-Internet Protocol - each device is given an IP address as soon as it
accesses the internet. It changes every time that the device goes on the internet
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