Computer Hardware MCQ Questions and Answers - Part 2
50 Computer Hardware MCQs with Detailed Explanations | CPU, RAM, Storage Devices | CCC, Banking, SSC Exam Preparation
1Which component is called the brain of the computer?
Answer: C
CPU executes program instructions and coordinates all computer operations.
2What is the main function of RAM?
Answer: B
RAM is volatile memory that loses data when power is turned off.
3Which storage device has the fastest data access speed?
Answer: B
SSDs use flash memory which is much faster than mechanical hard drives.
4Which port is commonly used to connect printers?
Answer: B
Modern printers typically use USB Type-B or wireless connections.
5What does HDD stand for?
Answer: B
HDDs store data on spinning magnetic platters with read/write heads.
6Which component is responsible for displaying graphics on monitor?
Answer: C
Dedicated graphics cards have their own processors and memory for better performance.
7What is the function of a power supply unit?
Answer: B
PSU provides different voltage levels (3.3V, 5V, 12V) to various components.
8Which type of memory is non-volatile?
Answer: C
ROM stores firmware and boot instructions permanently.
9What is the purpose of a heat sink?
Answer: C
Heat sinks prevent overheating and ensure stable component operation.
10Which connector is used for Ethernet cable?
Answer: C
RJ45 connectors have 8 pins and are used for wired internet connections.
11What does SSD stand for?
Answer: A
SSDs have no moving parts, making them faster and more durable than HDDs.
12Which component stores BIOS settings?
Answer: C
When CMOS battery dies, BIOS settings reset to default and system time is lost.
13What is the function of a motherboard?
Answer: C
Motherboard houses CPU, RAM, expansion cards and provides ports for peripherals.
14Which type of RAM is most commonly used in modern computers?
Answer: A
DDR4 offers higher speeds and lower power consumption than previous generations.
15What does GPU stand for?
Answer: B
GPUs are essential for gaming, video editing, and graphic design applications.
16Which port is used for connecting monitors?
Answer: C
HDMI has largely replaced VGA and DVI for modern display connections.
17What is cache memory used for?
Answer: B
L1, L2, L3 cache levels provide fastest access to critical data.
18Which component controls the computer's boot process?
Answer: C
BIOS performs Power-On Self-Test (POST) and loads the operating system.
19What is the purpose of a network card?
Answer: B
Modern motherboards have built-in network cards (Ethernet/Wi-Fi).
20Which storage device uses magnetic platters?
Answer: C
HDDs are mechanical devices with moving parts, making them slower than SSDs.
21Which device is used to read CDs and DVDs?
Answer: C
Optical drives can be CD-ROM, DVD-ROM, or Blu-ray drives.
22What is the purpose of a sound card?
Answer: B
Modern motherboards often have built-in sound cards.
23Which component stores the computer's startup instructions?
Answer: C
BIOS performs Power-On Self-Test (POST) before loading OS.
24What does PSU stand for?
Answer: A
PSU converts AC power to DC power required by computer components.
25Which port is typically used for connecting keyboards and mice?
Answer: C
Older computers used PS/2 ports for keyboards and mice.
26What is the function of a cooling fan?
Answer: B
Multiple fans are used in computer cases for proper airflow.
27Which memory type is fastest?
Answer: C
L1 cache is fastest, followed by L2 and L3 cache.
28What does VGA stand for?
Answer: A
VGA ports are blue and have 15 pins in 3 rows.
29Which component determines computer speed?
Answer: C
Higher GHz and more cores result in faster performance.
30What is the purpose of expansion slots?
Answer: B
Common expansion slots include PCI, PCIe, and AGP.
31Which storage device has no moving parts?
Answer: C
SSDs are more durable and faster than HDDs.
32What does ALU do in CPU?
Answer: C
ALU handles addition, subtraction, AND, OR operations.
33Which connector is used for audio output?
Answer: C
Green port for speakers, pink for microphone.
34What is the function of ROM?
Answer: B
ROM data is not lost when computer is turned off.
35Which component connects all computer parts?
Answer: C
All components plug into or connect to the motherboard.
36What does DDR stand for in RAM?
Answer: B
DDR RAM is faster than SDRAM.
37Which port transmits both video and audio?
Answer: C
HDMI is standard for modern TVs and monitors.
38What is the smallest unit of memory?
Answer: B
8 bits = 1 byte, 4 bits = 1 nibble.
39Which component is measured in GHz?
Answer: C
Higher GHz means faster processing speed.
40What is the purpose of a network card?
Answer: B
Also called NIC (Network Interface Card).
41Which storage has largest capacity typically?
Answer: C
Modern HDDs can store 1TB to 18TB data.
42What does BIOS stand for?
Answer: A
BIOS performs Power-On Self-Test before loading OS.
43Which component is volatile memory?
Answer: C
Volatile memory requires constant power.
44What is the function of CU in CPU?
Answer: B
CU coordinates between ALU, memory, and input/output devices.
45Which port is used for high-speed data transfer?
Answer: C
USB 3.0 ports are usually blue in color.
46What does LED stand for in computer context?
Answer: A
LEDs are used in monitors, power buttons, and status lights.
47Which component is responsible for computer graphics?
Answer: C
Dedicated GPUs provide better gaming and video performance.
48What is the purpose of a motherboard chipset?
Answer: B
Northbridge and Southbridge are two main chips in chipset.
49Which memory type is used for CPU cache?
Answer: B
SRAM is faster but more expensive than DRAM.
50What does SATA stand for?
Answer: A
SATA replaced older PATA (Parallel ATA) technology.
