Introductory COA questions look easy, and then the vocabulary trips you. Architecture gets read as organisation, hardware as software, speed as diligence, and a microprocessor as a microcontroller. The twelve questions below are previous-year MCQs from Kendriya Vidyalaya Sangathan, UGC NET, BPSC, Bihar STET and UP Police papers set between 2013 and 2026, and every one of them turns on a distinction of exactly that kind. Answer before you read the explanation, and take away the classification rather than the isolated fact.
Architecture, hardware and software: draw the boundary first
Use three boxes. Architecture covers programmer-visible attributes such as the instruction set, data types and addressing modes. Hardware is physical, while software is executable instructions and programs. Organisation is the internal arrangement that implements an architecture.
Q1
____ refers to those attributes of a system visible to a programmer or, put another way, those attributes that have a direct impact on the logical execution of a program. (Kendriya Vidyalaya Sangathan 2013)
(a)
Computer organization(b)
Computer architecture(c)
Microprocessor(d)
Bus
Answer: (b).
Architecture is the programmer-visible specification, including the instruction set, data representation and addressing modes. Organisation describes the units and connections that implement it, while a processor and bus are components. (see the solved page)
Q2
Which term is not related to computer hardware ? (UGC NET 2026)
(a)
Mother board(b)
Registers(c)
Algorithm(d)
Flip-flop
Answer: (c).
A motherboard, registers and flip-flops are physical electronic structures. An algorithm is a logical sequence of steps that may be expressed and executed through software, so it is not hardware. (see the solved page)
Q3
The primary function of an application software is: (UP Police 2023)
(a)
To perform specific user-oriented tasks(b)
To control peripheral devices(c)
To manage hardware resources(d)
To provide a platform for other software
Answer: (a).
A word processor or browser performs a user-oriented task. Device control, hardware-resource management and providing a software platform are system-software or operating-system roles. (see the solved page)
The Operating System Basics and Structure MCQs reinforce the boundary between system software and managed hardware.
Speed, accuracy and diligence are three different claims
Producing 1,000 salary slips quickly shows speed; 17 / 13 = 1.3076923077 to 10 decimal places shows accuracy; 10,000 repeated calculations without fatigue show diligence. Switching among editing, music and printing shows versatility.
Q4
Which of the following examples most appropriately represents the ‘Speed’ characteristic of the computer ? (Kendriya Vidyalaya Sangathan 2023)
(a)
Calculation and generation of salary slips of thousands of employees of an organization.(b)
Result of division of any two numbers upto 10 decimal points.(c)
Performing long and complex calculations with the same speed and accuracy from the start till the end.(d)
At one moment one can use the computer to prepare a letter document and in the next moment one may play music or print a document.
Answer: (a).
Completing many salary slips quickly represents speed. The other options describe accuracy, diligence and versatility respectively. (see the solved page)
Q5
Which of the following examples most appropriately represents the “accuracy” characteristic of the computer? (Kendriya Vidyalaya Sangathan 2023)
(a)
Calculation and generation of salary slips of thousands of employees of an organization.(b)
Result of division of any two numbers up to 10 decimal places.(c)
Performing long and complex calculations with the same speed and accuracy from the start till the end.(d)
At one moment preparing a letter, and at the next moment playing music or printing a document.
Answer: (b).
Precision to 10 decimal places is the accuracy cue. Correct results still require correct input and instructions; speed alone does not guarantee correctness. (see the solved page)
Q6
Which of the following examples most appropriately represents the “diligence” characteristic of the computer? (Kendriya Vidyalaya Sangathan 2023)
(a)
Calculation and generation of salary slips of thousands of employees(b)
Result of division of any two numbers up to 10 decimal places(c)
Performing long and complex calculations with the same speed and accuracy from start till the end(d)
Preparing a document at one moment and playing music or printing the next moment
Answer: (c).
Diligence means sustained work without tiredness or lost consistency. The clue is that the same speed and accuracy continue from start to finish. (see the solved page)
What a computer actually does with data
Arithmetic gives 27 + 15 = 42; logic tests 42 > 40 as true; storage saves it under order ID KG-102; retrieval reads 42. Check each operation before choosing all of the above.
Q7
The basic operations performed by a computer include: (Bihar STET 2019)
(a)
Arithmetic operation(b)
Logical operation(c)
Storage and Retrieval(d)
All of the above(e)
None of these
Answer: (d).
Arithmetic, logical processing, storage and retrieval are basic computer operations. Since (a), (b) and (c) are independently true, the combined option is correct. (see the solved page)
Microprocessor versus microcontroller: component or complete small system?
A microprocessor is mainly a CPU and needs external memory and I/O. A microcontroller integrates CPU, memory and programmable I/O. At 29°C against a 28°C threshold, it turns the fan on; below 100 lux, it turns the lamp on.
Q8
Computer on a single chip is called (BPSC 2023)
(a)
microcontroller(b)
microprocessor(c)
assembler(d)
More than one of the above(e)
None of the above
Answer: (a).
A microcontroller integrates the processor, memory and I/O for a small self-contained computer. A microprocessor is mainly the processing unit, while an assembler is translation software. (see the solved page)
Q9
Which of the following applications is a typical use of microcontrollers in the field of home automation? (Bihar STET 2025)
(a)
Satellite communication(b)
Air traffic control(c)
Temperature and lighting control(d)
Space exploration
Answer: (c).
Temperature and lighting use the sensor, decision and output loop shown in the 29°C and 100-lux example. The other choices are large specialised systems, not typical home automation. (see the solved page)
Why devices need buffers when their transfer rates differ
If a source supplies 4 bytes per millisecond and a destination consumes 1, the mismatch is 4 - 1 = 3 bytes per millisecond. After 4 milliseconds, a buffer holds 3 × 4 = 12 bytes. It smooths the temporary mismatch; buses or faster circuits do not provide this waiting area.
Q10
In various devices, ____ are used to overcome the difference in data transfer speed. (BPSC 2023)
(a)
multiple buses(b)
buffer registers(c)
speed-enhancing circuitries(d)
More than one of the above(e)
None of the above
Answer: (b).
Buffer registers hold data while the slower receiver catches up. Multiple buses may increase capacity, but they do not replace buffering for a timing mismatch. (see the solved page)
Storage media and mixed-component classification
Classify storage by recording mechanism. HDD is magnetic, USB flash is solid state, and Blu-ray Disc is optical.
Q11
Match List - I with List - II (UGC NET 2023)
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Choose the most appropriate answer from the options given below:
(a)
(A)-(II), (B)-(III), (C)-(I)(b)
(A)-(II), (B)-(I), (C)-(III)(c)
(A)-(III), (B)-(II), (C)-(I)(d)
(A)-(I), (B)-(III), (C)-(II)
Answer: (a).
The matches are HDD to magnetic (II), USB flash to solid state (III), and Blu-ray Disc to optical (I). Fix these pairs first, then choose the option containing all three. (see the solved page)
Q12
Which of the following statements are correct? (UGC NET 2025)
A. One KB has 1024 bytes.
B. Cache memory is a secondary storage.
C. Operating system is not an application software.
D. Hub is a network device.
E. ALU is a control unit.
Choose the correct answer from the options given below:
(a)
A, D and E Only(b)
A, B and C Only(c)
A, C and D Only(d)
C, D and E Only
Answer: (c).
One KB is 1024 bytes in the binary convention these papers use, so statement A is true. Cache is not secondary storage; an operating system is system software; a hub is a network device; and the ALU is distinct from the control unit. Therefore A, C and D survive. (see the solved page)
Memory Management in OS: Paging and Segmentation explains how paging maps a program onto main memory, and where the TLB speeds that translation up.
The short version and what to practise next
Architecture is the programmer-visible specification, while organisation is its implementation.
Hardware is physical, and application software serves a specific user task.
Speed, accuracy and diligence answer different questions.
Microcontrollers combine CPU, memory and I/O for small controlled systems.
Buffers absorb temporary rate mismatches between devices.
HDDs, flash drives and optical discs are classified by recording technology.
For hardware, continue with Sequential Circuits: Flip-Flops and Counters. Choose Zero to Hero for broad semester-level CS, GATE Guidance by Sanchit Sir for structured GATE preparation, or compare paths in the CS Fundamentals category.
