IGCSE COMPUTER SCIENCE INPUT,
OUTPUT & STORAGE DEVICES EXAM
QUESTIONS AND ANSWERS
Speakers/Headphones - Answer-A digital signal from the computer is converted using a
DAC and sent along a wire wrapped around a cone. The current comes into contact
with a magnetic field and vibrates the cone to produce sound.
What does the primary memory consist of? - Answer-ROM and RAM.
2D scanner - Answer-1. A moveable light source reflects off a hard copy document
2. The reflected light is channelled along with mirrors on a light sensor
3. The light sensor converts it into a digitalsignal which is saved as a digital image of the
original document
3D scanner - Answer-1.Have two light sources that reflect off object
2.Reflected light detected by light sensors
3.Using triangulation the points on the object are mapped
What are examples of secondary memory? - Answer-HDD and SSD.
What is the secondary memory? - Answer-Secondary memory is computer memory that
is non-volatile and persistent in nature and is not directly accessed by a
computer/processor. It allows a user to store data that may be instantly and easily
retrieved, transported and used by applications and services.
What is the primary memory? - Answer-It's a computer memory that a CPU accesses
directly.
What is the Random Access Memory (RAM)? - Answer-RAM is the main place for
storing instructions and data whilst a program is being executed.
What is the Read Only Memory (ROM)? - Answer-The ROM is flash memory which is
non-volatile.
Blu-ray Disc - Answer-Uses a shorter wavelength laser and can store the most data
compared to other optical storage devices
analogue signals - Answer-Vary continuously in frequency and amplitude
digital signals - Answer-Series of pulses consisting of just two states → ON (1) or OFF
(0)
OUTPUT & STORAGE DEVICES EXAM
QUESTIONS AND ANSWERS
Speakers/Headphones - Answer-A digital signal from the computer is converted using a
DAC and sent along a wire wrapped around a cone. The current comes into contact
with a magnetic field and vibrates the cone to produce sound.
What does the primary memory consist of? - Answer-ROM and RAM.
2D scanner - Answer-1. A moveable light source reflects off a hard copy document
2. The reflected light is channelled along with mirrors on a light sensor
3. The light sensor converts it into a digitalsignal which is saved as a digital image of the
original document
3D scanner - Answer-1.Have two light sources that reflect off object
2.Reflected light detected by light sensors
3.Using triangulation the points on the object are mapped
What are examples of secondary memory? - Answer-HDD and SSD.
What is the secondary memory? - Answer-Secondary memory is computer memory that
is non-volatile and persistent in nature and is not directly accessed by a
computer/processor. It allows a user to store data that may be instantly and easily
retrieved, transported and used by applications and services.
What is the primary memory? - Answer-It's a computer memory that a CPU accesses
directly.
What is the Random Access Memory (RAM)? - Answer-RAM is the main place for
storing instructions and data whilst a program is being executed.
What is the Read Only Memory (ROM)? - Answer-The ROM is flash memory which is
non-volatile.
Blu-ray Disc - Answer-Uses a shorter wavelength laser and can store the most data
compared to other optical storage devices
analogue signals - Answer-Vary continuously in frequency and amplitude
digital signals - Answer-Series of pulses consisting of just two states → ON (1) or OFF
(0)
