COMPUTER SYSTEMS & ARCHITECTURE EXAM
LATEST 2026 UPDATE 100 QUESTIONS AND
DETAILED VERIFIED ANSWERS FROM ACTUAL
EXAMS TEST GRADE A+
1. What is the primary function of the CPU?
A. Store permanent data
B. Execute instructions and process data
C. Display output on screen
D. Connect network devices
Answer: B. Execute instructions and process data
Rationale: The CPU is responsible for executing program instructions and
processing data.
2. Which component stores data temporarily while the computer is running?
A. ROM
B. Hard Disk
C. RAM
D. BIOS
Answer: C. RAM
Rationale: RAM provides temporary storage for active processes.
3. What does ALU stand for?
A. Arithmetic Logic Utility
B. Active Logical Unit
C. Arithmetic Logic Unit
,D. Array Logic Unit
Answer: C. Arithmetic Logic Unit
Rationale: The ALU performs arithmetic and logical operations.
4. Which memory is non-volatile?
A. RAM
B. Cache
C. Registers
D. ROM
Answer: D. ROM
Rationale: ROM retains data even when power is off.
5. What is the function of the Control Unit?
A. Stores data permanently
B. Displays output
C. Directs CPU operations
D. Performs arithmetic
Answer: C. Directs CPU operations
Rationale: The Control Unit coordinates all processor activities.
6. Which is secondary storage?
A. Cache
B. Register
C. Hard Disk Drive
D. CPU
Answer: C. Hard Disk Drive
Rationale: HDD stores data permanently.
,7. What is cache memory used for?
A. Long-term storage
B. Slowing CPU speed
C. Storing frequently used data
D. Network communication
Answer: C. Storing frequently used data
Rationale: Cache improves processing speed.
8. Which architecture uses one memory for data and instructions?
A. Harvard Architecture
B. RISC Architecture
C. Von Neumann Architecture
D. Parallel Architecture
Answer: C. Von Neumann Architecture
Rationale: Data and instructions share memory.
9. What is the function of an Operating System?
A. Runs hardware only
B. Designs software
C. Manages hardware and software
D. Stores files permanently
Answer: C. Manages hardware and software
Rationale: OS controls system resources.
10. Which device converts digital signals to analog?
, A. ADC
B. DAC
C. CPU
D. GPU
Answer: B. DAC
Rationale: DAC converts digital output to analog signals.
11. What does RAM stand for?
A. Random Access Memory
B. Read Access Memory
C. Rapid Action Memory
D. Real Active Memory
Answer: A. Random Access Memory
Rationale: RAM allows fast data access.
12. Which bus carries data?
A. Control Bus
B. Address Bus
C. Data Bus
D. System Bus
Answer: C. Data Bus
Rationale: Data bus transfers actual data.
13. What is the instruction cycle?
A. Store-Load-Execute
B. Fetch-Decode-Execute
C. Read-Write-Delete
LATEST 2026 UPDATE 100 QUESTIONS AND
DETAILED VERIFIED ANSWERS FROM ACTUAL
EXAMS TEST GRADE A+
1. What is the primary function of the CPU?
A. Store permanent data
B. Execute instructions and process data
C. Display output on screen
D. Connect network devices
Answer: B. Execute instructions and process data
Rationale: The CPU is responsible for executing program instructions and
processing data.
2. Which component stores data temporarily while the computer is running?
A. ROM
B. Hard Disk
C. RAM
D. BIOS
Answer: C. RAM
Rationale: RAM provides temporary storage for active processes.
3. What does ALU stand for?
A. Arithmetic Logic Utility
B. Active Logical Unit
C. Arithmetic Logic Unit
,D. Array Logic Unit
Answer: C. Arithmetic Logic Unit
Rationale: The ALU performs arithmetic and logical operations.
4. Which memory is non-volatile?
A. RAM
B. Cache
C. Registers
D. ROM
Answer: D. ROM
Rationale: ROM retains data even when power is off.
5. What is the function of the Control Unit?
A. Stores data permanently
B. Displays output
C. Directs CPU operations
D. Performs arithmetic
Answer: C. Directs CPU operations
Rationale: The Control Unit coordinates all processor activities.
6. Which is secondary storage?
A. Cache
B. Register
C. Hard Disk Drive
D. CPU
Answer: C. Hard Disk Drive
Rationale: HDD stores data permanently.
,7. What is cache memory used for?
A. Long-term storage
B. Slowing CPU speed
C. Storing frequently used data
D. Network communication
Answer: C. Storing frequently used data
Rationale: Cache improves processing speed.
8. Which architecture uses one memory for data and instructions?
A. Harvard Architecture
B. RISC Architecture
C. Von Neumann Architecture
D. Parallel Architecture
Answer: C. Von Neumann Architecture
Rationale: Data and instructions share memory.
9. What is the function of an Operating System?
A. Runs hardware only
B. Designs software
C. Manages hardware and software
D. Stores files permanently
Answer: C. Manages hardware and software
Rationale: OS controls system resources.
10. Which device converts digital signals to analog?
, A. ADC
B. DAC
C. CPU
D. GPU
Answer: B. DAC
Rationale: DAC converts digital output to analog signals.
11. What does RAM stand for?
A. Random Access Memory
B. Read Access Memory
C. Rapid Action Memory
D. Real Active Memory
Answer: A. Random Access Memory
Rationale: RAM allows fast data access.
12. Which bus carries data?
A. Control Bus
B. Address Bus
C. Data Bus
D. System Bus
Answer: C. Data Bus
Rationale: Data bus transfers actual data.
13. What is the instruction cycle?
A. Store-Load-Execute
B. Fetch-Decode-Execute
C. Read-Write-Delete
