1
The fastest memory in a computer is the:
Correct answer: C. CPU registers
Registers inside the CPU are fastest, then cache, then RAM; disks are much slower.
medium
Memory, Storage and Hardware Devices MCQs
Solved computer awareness MCQs on types of memory, storage devices, input and output devices used in banks and offices, printers, ports and computer units.
20 MCQsUpdated 27 October 2026
These MCQs cover the memory hierarchy from registers and cache to RAM, ROM and secondary storage, optical discs such as CDs and DVDs, the motherboard and other hardware, and common input and output devices.
Memory questions often ask which type is fastest, largest or volatile. Draw the hierarchy once, from the fastest and smallest at the top to the slowest and largest at the bottom, and most of these questions answer themselves.
- 2
ROM (Read Only Memory) is:
Correct answer: D. non-volatile
ROM keeps its contents without power, so it stores firmware such as the BIOS.
easy - 3
EEPROM is a type of ROM that can be:
Correct answer: C. erased and rewritten electrically
EEPROM stands for Electrically Erasable Programmable Read-Only Memory; EPROM is erased with UV light.
hard - 4
Pen drives and SSDs store data using:
Correct answer: D. Flash memory
Flash memory is non-volatile and has no moving parts.
easy - 5
CDs and DVDs read and write data using:
Correct answer: C. a laser beam
They are optical storage; Blu-ray discs use a shorter-wavelength blue-violet laser to store more data.
easy - 6
1 terabyte (TB) is equal to:
Correct answer: C. 1,024 GB
In binary units: 1 TB = 1,024 GB.
easy - 7
A nibble is equal to:
Correct answer: B. 4 bits
A nibble is half a byte: 4 bits.
medium - 8
The speed of a modern CPU is usually measured in:
Correct answer: C. GHz
Clock speed is measured in gigahertz (billions of cycles a second).
easy - 9
The main circuit board of a computer, to which the CPU and memory are connected, is the:
Correct answer: B. Motherboard
The motherboard connects all the main parts and carries data between them.
easy - 10
UPS, used to keep a computer running during a power cut, stands for:
Correct answer: A. Uninterruptible Power Supply
A UPS uses a battery to supply power for a short time so that work can be saved.
easy - 11
Banks use MICR technology to read:
Correct answer: A. the special characters printed at the bottom of cheques
MICR (Magnetic Ink Character Recognition) reads the cheque number and bank code printed in magnetic ink.
medium - 12
OMR technology is commonly used to:
Correct answer: B. check multiple-choice answer sheets
Optical Mark Recognition detects the shaded bubbles on answer sheets.
easy - 13
Which of these is an input device?
Correct answer: B. Scanner
A scanner sends images into the computer; the others are output devices.
easy - 14
Which device works as both an input and an output device?
Correct answer: C. Touchscreen
A touchscreen displays output and also takes input when touched.
easy - 15
A plotter is used mainly to:
Correct answer: B. print large drawings such as maps and building plans
Plotters print large, precise line drawings for engineering and architecture.
medium - 16
A dot-matrix printer is an example of a(n):
Correct answer: D. impact printer
Its pins strike an inked ribbon against the paper, so it can print carbon copies.
medium - 17
LCD in LCD monitors stands for:
Correct answer: D. Liquid Crystal Display
Liquid crystals control how much light passes through each pixel.
easy - 18
Which port carries both high-definition video and audio through a single cable?
Correct answer: A. HDMI
HDMI (High-Definition Multimedia Interface) carries both; VGA carries only analogue video.
medium - 19
A GPU in a computer is mainly used for:
Correct answer: A. processing graphics and images
The Graphics Processing Unit handles images and video, and is also used for AI and scientific computing.
easy - 20
In a computer, SMPS refers to the:
Correct answer: D. Switched Mode Power Supply
The SMPS converts mains AC into the steady low-voltage DC that the computer's parts need.
medium