This section contain 50 multiple-choice questions (MCQs) focused on the topic of CPU (Central Processing Unit) and its functions MCQs,along with their answers:
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1. What does CPU stand for?
- Computer Performance Unit
- Central Personal Unit
- Central Processing Unit
- Central Power Unit
CPU stands for Central Processing Unit, which is the primary component of a computer responsible for executing instructions.
2. What is the primary function of the CPU?
- To display images on the screen
- To store data permanently
- To process data and execute instructions
- To connect to the internet
The primary function of the CPU is to process data and execute instructions.
3. Which component of the CPU is responsible for performing arithmetic and logic operations?
- Control Unit
- ALU (Arithmetic Logic Unit)
- Cache Memory
- Register
The ALU (Arithmetic Logic Unit) is responsible for performing arithmetic and logic operations within the CPU.
4. What is the purpose of the Control Unit in the CPU?
- To perform mathematical calculations
- To manage memory storage
- To control the flow of data and instructions within the CPU
- To display images on the screen
The Control Unit in the CPU is responsible for controlling the flow of data and instructions within the CPU.
5. What is a CPU register?
- A temporary storage area within the CPU
- A type of computer monitor
- A network interface card
- A software application
A CPU register is a temporary storage area within the CPU used for fast data access during processing.
6. What does the clock speed of a CPU measure?
- The number of CPU cores
- The processing speed of the CPU
- The amount of RAM in the CPU
- The size of the CPU cache
The clock speed of a CPU measures its processing speed, typically in gigahertz (GHz).
7. Which of the following is not a function of the CPU?
- Fetching instructions from memory
- Decoding instructions
- Executing instructions
- Storing data permanently
Storing data permanently is not a function of the CPU; it is typically done by storage devices such as hard drives.
8. What is the purpose of the CPU cache memory?
- To store permanent data
- To provide additional processing power to the CPU
- To store frequently accessed data for faster retrieval by the CPU
- To display images on the screen
CPU cache memory is used to store frequently accessed data for faster retrieval by the CPU, improving processing speed.
9. Which unit in the CPU is responsible for fetching instructions from memory?
- ALU (Arithmetic Logic Unit)
- Control Unit
- Register
- Cache Memory
The Control Unit in the CPU is responsible for fetching instructions from memory.
10. What is the purpose of a CPU clock?
- To keep track of time and date
- To regulate the temperature of the CPU
- To synchronize and control the execution of instructions
- To display images on the screen
A CPU clock is used to synchronize and control the execution of instructions within the CPU.
11. Which component of the CPU acts as a temporary storage for data and instructions during processing?
- Control Unit
- ALU (Arithmetic Logic Unit)
- Cache Memory
- Register
Registers in the CPU act as temporary storage for data and instructions during processing.
12. What is the function of the CPU's Arithmetic Logic Unit (ALU)?
- To control input and output operations
- To perform mathematical and logical operations
- To store data permanently
- To display images on the screen
The ALU (Arithmetic Logic Unit) in the CPU is responsible for performing mathematical and logical operations.
13. What is the purpose of the CPU's control bus?
- To transport data within the CPU
- To control the flow of data between the CPU and other components
- To store data permanently
- To connect to the internet
The control bus in the CPU is used to control the flow of data between the CPU and other components of the computer.
14. Which of the following is not a type of CPU cache?
- L1 Cache
- L2 Cache
- RAM Cache
- L3 Cache
RAM Cache is not a type of CPU cache; it refers to caching data in system RAM.
15. What is the purpose of pipelining in CPU design?
- To prevent overheating of the CPU
- To reduce power consumption
- To improve instruction execution throughput
- To connect to the internet
Pipelining is used in CPU design to improve instruction execution throughput and efficiency.
16. What is clock speed measured in?
- Megabits (Mb)
- Hertz (Hz)
- Kilobytes (KB)
- Gigabytes (GB)
Clock speed is measured in Hertz (Hz), typically gigahertz (GHz) for CPUs.
17. What is the role of the CPU's data bus?
- To transport control signals within the CPU
- To transport data between the CPU and memory or other components
- To store program instructions
- To display images on the screen
The data bus in the CPU is used to transport data between the CPU and memory or other components.
18. What is a CPU core?
- A physical processor unit within the CPU
- A type of computer monitor
- A network interface card
- A software application
A CPU core is a physical processor unit within the CPU that can independently execute instructions.
19. Which component of the CPU acts as a temporary storage for data and instructions frequently used by the CPU?
- Control Unit
- ALU (Arithmetic Logic Unit)
- Cache Memory
- Register
Cache Memory acts as temporary storage for frequently used data and instructions by the CPU.
20. What is the primary function of the CPU's instruction register?
- To store program instructions
- To control the CPU's clock speed
- To execute mathematical calculations
- To display images on the screen
The instruction register in the CPU is used to store program instructions being executed.
21. What is the purpose of the CPU's program counter?
- To store program instructions
- To keep track of the current instruction being executed
- To execute mathematical calculations
- To connect to the internet
The program counter in the CPU keeps track of the current instruction being executed.
22. What is clock cycle time?
- The time it takes to turn on a computer
- The time it takes to execute a single instruction
- The time it takes for one clock pulse to occur
- The time it takes to shut down a computer
Clock cycle time is the time it takes for one clock pulse to occur in the CPU.
23. Which unit in the CPU is responsible for decoding instructions?
- ALU (Arithmetic Logic Unit)
- Control Unit
- Register
- Cache Memory
The Control Unit in the CPU is responsible for decoding instructions.
24. What is the role of the CPU's accumulator register?
- To store program instructions
- To accumulate the results of arithmetic operations
- To control the CPU's clock speed
- To display images on the screen
The accumulator register in the CPU is used to accumulate the results of arithmetic operations.
25. What is a CPU's clock frequency measured in?
- Bytes (B)
- Hertz (Hz)
- Megapixels (MP)
- Gigabytes (GB)
A CPU's clock frequency is measured in Hertz (Hz), typically gigahertz (GHz) for modern CPUs.
26. What is the purpose of the CPU's stack pointer register?
- To store program instructions
- To point to the top of the call stack
- To control the CPU's clock speed
- To display images on the screen
The stack pointer register in the CPU is used to point to the top of the call stack, which is crucial for managing function calls and data storage.
27. What is superscalar processing in CPU design?
- A type of cooling system for CPUs
- A design that allows the CPU to execute multiple instructions simultaneously
- A type of CPU cache
- A type of memory management technique
Superscalar processing is a CPU design that allows the CPU to execute multiple instructions simultaneously, improving processing speed.
28. What is the primary function of the CPU's instruction decoder?
- To store program instructions
- To fetch data from memory
- To decode and interpret program instructions
- To create graphics
The instruction decoder in the CPU is responsible for decoding and interpreting program instructions.
29. What is clock frequency often referred to as in CPU specifications?
- Megahertz (MHz)
- Kilobytes (KB)
- Terabytes (TB)
- Megapixels (MP)
Clock frequency in CPU specifications is often referred to as Megahertz (MHz) or Gigahertz (GHz).
30. What is the primary function of the CPU's control unit?
- To perform arithmetic calculations
- To manage memory storage
- To control the flow of data and instructions within the CPU
- To connect to the internet
The primary function of the control unit in the CPU is to control the flow of data and instructions within the CPU.
31. Which of the following is NOT a component of the CPU?
- ALU (Arithmetic Logic Unit)
- Cache Memory
- Monitor
- Register
The monitor is not a component of the CPU; it is an output device.
32. What is the purpose of the CPU's clock generator circuit?
- To measure time
- To regulate the temperature of the CPU
- To generate clock pulses for synchronization
- To display images on the screen
The CPU's clock generator circuit generates clock pulses for synchronization and timing of operations.
33. What is the role of the CPU's program status word (PSW) register?
- To store program instructions
- To store data permanently
- To store the current state of the CPU
- To connect to the internet
The program status word (PSW) register in the CPU is used to store the current state of the CPU, including flags and condition codes.
34. What is a pipeline in CPU design?
- A cooling system for CPUs
- A series of stages in instruction processing
- A type of CPU cache
- A memory management technique
A pipeline in CPU design is a series of stages in instruction processing, allowing multiple instructions to be processed simultaneously.
35. What is the function of the CPU's instruction fetch unit?
- To execute mathematical calculations
- To fetch instructions from memory
- To perform logic operations
- To display images on the screen
The instruction fetch unit in the CPU is responsible for fetching instructions from memory.
36. What is the purpose of the CPU's status flags?
- To display images on the screen
- To indicate the current state of the CPU and results of operations
- To control input and output operations
- To store data permanently
CPU's status flags are used to indicate the current state of the CPU and the results of various operations.
37. Which of the following is a characteristic of multi-core CPUs?
- Slower processing speed
- Lower power consumption
- Single processor unit
- Improved multitasking and performance
Multi-core CPUs have multiple processor units, which improve multitasking and overall performance.
38. What is the role of the CPU's interrupt controller?
- To perform mathematical calculations
- To manage memory storage
- To handle hardware and software interrupts
- To create graphics
The interrupt controller in the CPU is responsible for handling hardware and software interrupts.
39. What is the primary function of the CPU's data bus?
- To transport control signals within the CPU
- To transport data between the CPU and memory or other components
- To store program instructions
- To display images on the screen
The data bus in the CPU is used to transport data between the CPU and memory or other components.
40. What is the purpose of the CPU's clock multiplier?
- To measure time accurately
- To regulate the CPU's temperature
- To control the CPU's clock speed
- To connect to the internet
The CPU's clock multiplier is used to control and adjust the CPU's clock speed.
41. What is a CPU's cache hit?
- A successful memory access from the CPU cache
- A failure in fetching data from memory
- A cooling system for CPUs
- A type of memory module
A CPU cache hit refers to a successful memory access from the CPU cache.
42. Which unit in the CPU is responsible for managing memory access and storage?
- ALU (Arithmetic Logic Unit)
- Control Unit
- Memory Management Unit (MMU)
- Register
The Memory Management Unit (MMU) in the CPU is responsible for managing memory access and storage.
43. What is the function of the CPU's flag register?
- To store program instructions
- To store data permanently
- To control the CPU's clock speed
- To store status flags indicating the CPU's condition
The flag register in the CPU is used to store status flags indicating the CPU's condition.
44. What is the purpose of the CPU's fetch-decode-execute cycle?
- To display images on the screen
- To manage memory storage
- To execute program instructions sequentially
- To
The fetch-decode-execute cycle in the CPU is used to execute program instructions sequentially.
45. What is a CPU's cache miss?
- A successful memory access from the CPU cache
- A failure in fetching data from memory
- A type of cooling system for CPUs
- A type of memory module
A CPU cache miss refers to a failure in fetching data from memory, requiring a longer access time.
46. What is the purpose of the CPU's clock divider circuit?
- To measure time
- To regulate the CPU's temperature
- To divide the CPU's clock signal into lower frequencies
- To connect to the internet
The CPU's clock divider circuit is used to divide the CPU's clock signal into lower frequencies for different components.
47. What is the role of the CPU's data cache (D-cache)?
- To store program instructions
- To store data permanently
- To store frequently accessed data for faster retrieval
- To perform mathematical calculations
The data cache (D-cache) in the CPU is used to store frequently accessed data for faster retrieval.
48. What is the purpose of the CPU's microcode?
- To create graphics
- To store program instructions
- To provide low-level control for executing instructions
- To connect to the internet
The microcode in the CPU provides low-level control for executing instructions.
49. What is the role of the CPU's floating-point unit (FPU)?
- To manage memory storage
- To perform floating-point arithmetic operations
- To store program instructions
- To display images on the screen
The floating-point unit (FPU) in the CPU is responsible for performing floating-point arithmetic operations.
50. What is the purpose of the CPU's pipeline hazard detection unit?
- To measure time
- To regulate the CPU's temperature
- To detect and handle hazards in instruction execution
- To connect to the internet
The pipeline hazard detection unit in the CPU is used to detect and handle hazards in instruction execution.
