Central Processing Unit - Part 1 - Topic Guide and MCQs

1. Which component is often called the 'Brain of the Computer'?

   1. CPU
   2. Monitor
   3. Hard Disk
   4. Keyboard
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   Answer: (A) CPU

   Explanation: The CPU is called the Brain of the Computer because it controls and performs almost all processing operations.

2. CPU stands for:

   1. Central Program Unit
   2. Control Processing Unit
   3. Central Processing Unit
   4. Computer Processing Unit
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   Answer: (C) Central Processing Unit

   Explanation: CPU stands for Central Processing Unit.

3. Which of the following is NOT another name for the CPU?

   1. Motherboard
   2. Processor
   3. Central Processor
   4. Microprocessor
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   Answer: (A) Motherboard

   Explanation: The CPU is also known as Processor, Central Processor or Microprocessor; the motherboard holds the CPU socket.

4. Converting raw data into meaningful information is which function of the CPU?

   1. Executing instructions
   2. Managing input and output devices
   3. Running software
   4. Processing data
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   Answer: (D) Processing data

   Explanation: Under 'Processes Data', the CPU converts raw data into meaningful information.

5. The CPU is installed in a special socket called the CPU Socket, which is located on the:

   1. Hard Disk
   2. RAM module
   3. Motherboard
   4. Monitor
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   Answer: (C) Motherboard

   Explanation: The CPU Socket that holds the CPU is located on the Motherboard.

6. Which was the world's first microprocessor?

   1. Intel 4004
   2. Intel 8086
   3. Intel Core i3
   4. AMD Ryzen 3
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   Answer: (A) Intel 4004

   Explanation: The world's first microprocessor was the Intel 4004, developed by Intel Corporation.

7. In which year was the Intel 4004 microprocessor introduced?

   1. 1969
   2. 1971
   3. 1975
   4. 1981
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   Answer: (B) 1971

   Explanation: Intel 4004 was developed by Intel Corporation in 1971.

8. The CPU mainly consists of:

   1. Control Unit, ALU and Hard Disk
   2. ALU, Monitor and Registers
   3. Control Unit, Keyboard and ALU
   4. Control Unit, ALU and Registers
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   Answer: (D) Control Unit, ALU and Registers

   Explanation: The main components of the CPU are the Control Unit (CU), Arithmetic Logic Unit (ALU) and Registers (Memory Unit).

9. Which part of the CPU controls and coordinates all operations of the computer?

   1. Arithmetic Logic Unit (ALU)
   2. Registers
   3. Control Unit (CU)
   4. CPU Socket
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   Answer: (C) Control Unit (CU)

   Explanation: The Control Unit controls and coordinates all operations of the computer (CU = Controls Everything).

10. The Control Unit is compared to which of the following, directing the flow of information inside the computer?

    1. A Traffic Police Officer
    2. A Calculator
    3. A Librarian
    4. A Postman
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    Answer: (A) A Traffic Police Officer

    Explanation: The Control Unit acts like a Traffic Police Officer directing the flow of information inside the computer.

11. Which function of the Control Unit ensures that instructions are executed in the correct order?

    1. Decodes Instructions
    2. Maintains Instruction Sequence
    3. Generates Control Signals
    4. Controls Data Flow
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    Answer: (B) Maintains Instruction Sequence

    Explanation: 'Maintains Instruction Sequence' ensures instructions are executed in the correct order.

12. Converting instructions into understandable signals is which function of the Control Unit?

    1. Coordinating operations
    2. Maintaining instruction sequence
    3. Storing results
    4. Decoding instructions
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    Answer: (D) Decoding instructions

    Explanation: Under 'Decodes Instructions', the CU converts instructions into understandable signals.

13. The Program Counter (PC) stores:

    1. The result of the last calculation
    2. The address of the next instruction
    3. The opcode of the current instruction
    4. The clock speed of the CPU
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    Answer: (B) The address of the next instruction

    Explanation: The Program Counter stores the address of the next instruction.

14. During decoding, what does the Opcode tell the CPU?

    1. On which data the operation should be performed
    2. What operation must be performed
    3. Where the result must be stored
    4. The address of the next instruction
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    Answer: (B) What operation must be performed

    Explanation: Opcode tells the CPU what operation must be performed; Operand tells on which data it is performed.

15. Which part of the CPU performs arithmetic and logical operations?

    1. Control Unit
    2. Program Counter
    3. ALU
    4. CPU Socket
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    Answer: (C) ALU

    Explanation: The Arithmetic Logic Unit (ALU) performs arithmetic and logical operations; it is the calculator and decision-maker of the CPU.

16. When the ALU checks whether '50 > 30' is true or false, it is performing a:

    1. Arithmetic operation
    2. Fetch operation
    3. Storage operation
    4. Logical operation
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    Answer: (D) Logical operation

    Explanation: Comparisons such as Greater Than (>) are logical operations performed by the ALU.

17. According to the CU vs ALU comparison, which statement is correct?

    1. CU processes data, while ALU does not
    2. Both CU and ALU process data
    3. CU does not process data, while ALU does
    4. Neither CU nor ALU processes data
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    Answer: (C) CU does not process data, while ALU does

    Explanation: Data processing: Control Unit – No, ALU – Yes; CU is the supervisor and ALU the calculator.

18. Which is the fastest memory in a computer?

    1. Hard Disk
    2. Registers
    3. RAM
    4. Pen Drive
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    Answer: (B) Registers

    Explanation: Exam Point: Registers are the fastest memory in a computer; they are very small, very fast memory locations inside the CPU.

19. The register abbreviated as MAR stands for:

    1. Main Access Register
    2. Memory Arithmetic Register
    3. Machine Address Register
    4. Memory Address Register
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    Answer: (D) Memory Address Register

    Explanation: Examples of registers include PC, IR, MAR (Memory Address Register) and MDR (Memory Data Register).

20. The clock speed of modern CPUs is measured in:

    1. Gigahertz (GHz)
    2. Megabytes (MB)
    3. Dots Per Inch (DPI)
    4. Pages Per Minute (PPM)
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    Answer: (A) Gigahertz (GHz)

    Explanation: The unit of clock speed is Hertz (Hz); modern CPUs are measured in Gigahertz (GHz).

21. A processor running at 4.0 GHz can perform approximately how many clock cycles per second?

    1. 4 million
    2. 4 thousand
    3. 40 billion
    4. 4 billion
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    Answer: (D) 4 billion

    Explanation: A 4.0 GHz processor performs approximately 4 billion clock cycles per second.

22. A CPU with 6 cores is called:

    1. Hexa-Core
    2. Quad-Core
    3. Octa-Core
    4. Dual-Core
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    Answer: (A) Hexa-Core

    Explanation: Single-Core 1, Dual-Core 2, Quad-Core 4, Hexa-Core 6, Octa-Core 8 cores.

23. The Instruction Cycle is also called the:

    1. Fetch-Decode-Execute Cycle
    2. Input-Output Cycle
    3. Clock-Core Cycle
    4. Read-Write Cycle
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    Answer: (A) Fetch-Decode-Execute Cycle

    Explanation: The Instruction Cycle, the sequence of operations to execute an instruction, is also called the Fetch-Decode-Execute Cycle.

24. In the fetch step of the Instruction Cycle, the fetched instruction is stored in the:

    1. MDR (Memory Data Register)
    2. CIR (Current Instruction Register)
    3. ALU
    4. CPU Socket
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    Answer: (B) CIR (Current Instruction Register)

    Explanation: In the fetch step, the instruction is fetched from main memory and stored in the CIR (Current Instruction Register).

25. Ryzen 3, Ryzen 5, Ryzen 7 and Ryzen 9 processors are made by:

    1. Intel
    2. IBM
    3. AMD
    4. Apple
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    Answer: (C) AMD

    Explanation: Intel (Core i3, i5, i7, i9) and AMD (Ryzen 3, 5, 7, 9) are the two most popular CPU manufacturers.

Central Processing Unit - Part 1 is factual rather than analytical: you either recall it in seconds or you lose the mark to somebody who did. That makes it one of the cheapest sections to convert - a handful of short sittings usually settles the whole cluster.

Expect one-line recall questions - definitions, stand-for expansions, identifiers and the ordering of things. Practise the wording as well as the concept: these papers test terminology, and the set above uses the same four-option shape they do.

Past papers reuse clusters like this almost verbatim across years and posts. Run the same set until every distractor is familiar - previous-year style questions stop being recall and start being free marks.