Exam (elaborations)
IGCSE Computer Science
- Course
- Institution
IGCSE Computer Science IGCSE Computer Science IGCSE Computer Science
[Show more]
Content preview
IGCSE Computer ScienceWhat is the definition of an Input Device? -C0RRECT ANS Any device that allows a computer to receive
data from the outside world
How many types of scanners are there? -C0RRECT ANS 5
What type of scanner is used at airports to read passport pages? -C0RRECT ANS 2D Scanners
What type of scanner uses gamma rays? -C0RRECT ANS SPCET Scanners
What is the name of the input device that reads a series of dark and light lines of varying thickness? -
C0RRECT ANS Barcode Reader
What does the light line represent in a barcode? -C0RRECT ANS 0
Where is the most common place that Barcode Readers are used? -C0RRECT ANS Supermarkets
What does QR stand for in QR Code? -C0RRECT ANS Quick Response
How many times more data (approximately) can a QR code hold compared to a barcode? -C0RRECT ANS
200
What are 3 automatic adjustments that a microprocessor in a digital camera make? -C0RRECT ANS
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? -C0RRECT ANS
Light-sensitive cell
What determines the file size of a photograph? -C0RRECT ANS Number of pixels
What are two external factors that affect the quality of the photograph? -C0RRECT ANS Type of lens and
lighting
What is the name for the most common input device? -C0RRECT ANS Keyboard
What do most computer systems use to prevent the microprocessor waiting for keys to be pressed? -
C0RRECT ANS Keyboard buffer
What injury are users prone to who do a lot of typing? -C0RRECT ANS Repetitive Strain Injury (RSI)
What are the two most common pointing devices? -C0RRECT ANS Mouse and trackerball
Which port connects the mouse to the computer? -C0RRECT ANS USB
What 3 common features do all mouses have? -C0RRECT ANS 2 buttons and a scroll wheel
What is the most common environment for where trackerballs are used? -C0RRECT ANS Control rooms
What is the name of the device that is used to input sound into a computer? -C0RRECT ANS Microphone
What is the name of the device that converts analogue data to digital data? -C0RRECT ANS Analogue to
Digital Converter (ADC)
,What are the 3 types of touchscreen? -C0RRECT ANS Capacitive, Infra-red, Resistive
What general type of touchscreen allows users to utilise whilst wearing gloves or using a stylus? -
C0RRECT ANS Resistive
What are the most common types of sensors? -C0RRECT ANS Monitoring and Control
What is the name of the device that converts digital data to analogue data? -C0RRECT ANS Digital to
Analogue Converter (DAC)
What component of a machine is responsible for controlling systems in control applications? -C0RRECT
ANS Actuators
How would monitoring sensors be used in a hospital? -C0RRECT ANS To monitor a patient's vital signs
What are two ways that control sensors are used on the street? -C0RRECT ANS Street lighting and traffic
light control
In street lighting, how long is a lamp left on or off for before readings are sampled again? -C0RRECT ANS
30 minutes
Benefits of high level languages? -C0RRECT ANS 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? -C0RRECT ANS C++, Delphi, Java, Pascal, Python, Visual basic.
, Why do people use low level languages -C0RRECT ANS 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 -C0RRECT ANS difficult to understand, programmers
don't usually write in it, in binary (instructions that a computer understands)
Define a compiler -C0RRECT ANS 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 -C0RRECT ANS 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? -C0RRECT ANS 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? -C0RRECT ANS Where a program statement doesn't obey the rules of the
programming language
Define a logic error -C0RRECT ANS An error where the program doesn't do what the programmer
wanted it to do
What happens when a runtime error occurs -C0RRECT ANS 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.
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 lectjoseph. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now