MCQ
Basic Computer: Computer Organisation MCQ - Practice Questions with Answers
Solve 15 Basic Computer: Computer Organisation questions for RAS/RPSC preparation.
Practice questions
Q1Consider the following statements about the ALU and CPU. Statement I: The ALU performs arithmetic and logical operations. Statement II: The CPU is made only of the ALU and has no control function. Which of the following is correct?
The ALU is the arithmetic and logic section of the CPU. It performs operations such as addition, subtraction, comparison and logical decisions, so Statement I is correct. Statement II overstates the role of the ALU. A CPU is not only the ALU; it also has a Control Unit, and in many descriptions includes registers for fast temporary storage. The Control Unit is essential because it directs instruction execution and data movement. Therefore, the correct evaluation is: Statement I is correct, but Statement II is incorrect.
Q2Read the Assertion and Reason about memory in a computer organisation diagram. Assertion (A): Main memory is connected with the CPU because instructions and data needed for processing must be available quickly. Reason (R): The CPU directly performs all long-term storage functions of the hard disk. Choose the correct answer.
In a computer organisation diagram, main memory is shown close to the CPU because the CPU needs current instructions and data during processing. That makes Assertion A true. However, the Reason wrongly says that the CPU performs all long-term storage functions of the hard disk. Long-term storage is the job of secondary storage devices such as HDD or SSD. The CPU processes instructions and coordinates work; it does not act as the permanent storage device. Therefore, A is true but R is false.
Q3Consider the following statements about CPU organisation. Statement 1: The CPU mainly contains the ALU, Control Unit and registers. Statement 2: Registers are high-speed storage locations used by the CPU during processing. Which of the above statements is/are correct?
The question tests the internal organisation of the CPU, not the whole computer system. A CPU is usually explained as containing the ALU, which performs calculations and logic, the Control Unit, which coordinates instruction execution, and registers, which hold data or instructions temporarily at very high speed. Statement 1 correctly names these main parts, and Statement 2 correctly describes registers. Since both statements agree with the standard CPU block-level description, the correct option is that both are correct.
Q4In the basic block diagram of a computer, which two units are normally shown inside the CPU?
A standard computer block diagram separates input, processing, memory and output. The processing block is the CPU. Inside the CPU, the Arithmetic Logic Unit performs arithmetic and logical operations, while the Control Unit directs the sequence of operations and movement of data. The cue in the question is “inside the CPU”, so external devices such as keyboard, monitor or printer are eliminated. RAM and hard disk are memory or storage components, not the CPU’s two core units. Hence, ALU and Control Unit is the correct pair.
Q5Which statement correctly describes the role of the Control Unit in a CPU?
The Control Unit is the coordinating part of the CPU. It fetches instructions from memory, decodes or interprets them, and sends control signals so that the ALU, memory and input-output units act in the correct order. It is not a permanent storage device, a display device, or an OCR tool. The option that mentions fetching, interpreting and directing other units matches the standard role of the Control Unit in the computer organisation block diagram.
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More questions
6Match List I with List II in the context of a computer block diagram. List I: I. Input Unit II. Memory Unit III. ALU IV. Output Unit List II: a. Shows processed information b. Performs arithmetic and logical operations c. Accepts data and instructions d. Stores data and instructions
7In the basic block diagram of a computer, which unit performs arithmetic operations such as addition and subtraction, and logical comparisons such as greater than or equal to?
8Match List I with List II in the context of a basic computer block diagram. List I: I. Input Unit II. Output Unit III. ALU IV. Control Unit List II: 1. Presents processed results to the user 2. Performs arithmetic and logical operations 3. Accepts data and instructions 4. Coordinates execution of instructions
9Consider the following statements about CPU and memory in a computer organisation diagram. Statement 1: The CPU directly works with main memory while executing instructions. Statement 2: Secondary storage is generally faster than main memory for immediate processing. Which of the statements given above is/are correct?
10Match the blocks in List I with their correct functions in List II. List I: I. Input Unit II. ALU III. Output Unit List II: 1. Presents processed results 2. Performs arithmetic and logical operations 3. Accepts data and instructions
11Read the following assertion and reason about the CPU. Assertion (A): The CPU is known as the main processing unit of a computer. Reason (R): The CPU directly prints the final result on paper without using any output device. Choose the correct option.
12A single-bus structure is primarily found in:
13Which statement correctly describes the role of the Control Unit in a computer?
14In the basic block diagram of a computer, which unit performs arithmetic operations such as addition and logical operations such as comparison?
15Read the Assertion (A) and Reason (R) carefully. Assertion (A): The CPU is known as the processing unit of a computer. Reason (R): Inside the CPU, the ALU performs arithmetic and logical operations, while the Control Unit controls the sequence of operations. Choose the correct option.