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Computer Organization and Architecture MCQs with Answers

Computer Organization and Architecture MCQs: This section contains multiple-choice questions and answers on the various topics of Computer Organization and Architecture. Practice these MCQs to test and enhance your skills on Computer Organization and Architecture.

List of Computer Organization and Architecture MCQs

1. Which of the following serves as a bridge between hardware and software?

  1. Computer organization
  2. Computer architecture

Answer: B) Computer architecture

Explanation:

Computer architecture serves as a bridge between hardware and software, whereas computer organization is concerned with the components of a system link.

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2. Computer Organization deals with ____ design issues.

  1. Low-level
  2. High-level

Answer: A) Low-level

Explanation:

High-level design challenges are addressed in computer architecture, whereas Low-level design challenges are addressed by Computer organizations.

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3. RAM and ROM are the examples of ____ memory.

  1. Primary memory
  2. Secondary memory

Answer: A) Primary memory

Explanation:

RAM and ROM are examples of primary memory.

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4. Secondary memory is also known as ____.

  1. Volatile Memory
  2. Non-volatile memory

Answer: B) Non-volatile memory

Explanation:

Secondary memory is also known as non-volatile memory.

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5. The ____ unit is often known as the computer system's nerve center.

  1. Input unit
  2. Output unit
  3. Arithmetic and logic unit
  4. Control unit

Answer: D) Control unit

Explanation:

The control unit is often known as the computer system's nerve center.

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6. Which of the following register keeps track of how instructions are being executed?

  1. Instruction registers
  2. Memory address registers
  3. Program counter register
  4. Memory and memory data register

Answer: C) Program counter register

Explanation:

The Programme counter keeps track of how instructions are being executed.

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7. Which of the following register is used to store the currently executed instruction?

  1. Instruction registers
  2. Memory address registers
  3. Program counter register
  4. Memory and memory data register

Answer: A) Instruction registers

Explanation:

The instruction register IR is used to store the currently executed instruction.

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8. Which of the following register contains the address of the main memory to or from which data is to be transferred?

  1. Memory address registers
  2. Memory and memory data register

Answer: A) Memory address registers

Explanation:

The MAR (Memory address register) contains the address of the main memory to or from which data is to be transferred.

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9. How many types are there of instructions code?

  1. 2
  2. 3
  3. 4
  4. 5

Answer: B) 3

Explanation:

A simple computer has three types of instruction code formats:

  • Memory - command for referencing
  • Register - instruction for referencing
  • Instruction for Input-Output

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10. The control unit is specified into how many categories?

  1. 2
  2. 3
  3. 4
  4. 5

Answer: A) 2

Explanation:

The Control Unit is divided into two categories:

  • Hardwired Control
  • Microprogrammed Control

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11. The ____ Control organization is responsible for implementing control logic using gates, flip-flops, decoders, and other digital circuits.

  1. Hardwired Control
  2. Microprogrammed Control

Answer: A) Hardwired Control

Explanation:

The Hardwired Control organization is responsible for implementing control logic using gates, flip-flops, decoders, and other digital circuits.

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12. The ____ approach is used to implement the Microprogrammed Control organization.

  1. Logic gates approach
  2. Recursive approach
  3. Programming approach

Answer: C) Programming approach

Explanation:

The programming approach is used to implement the Microprogrammed Control organization.

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13. How many types of basic logic gates are there?

  1. 6
  2. 8
  3. 7
  4. 10

Answer: C) 7

Explanation:

The seven basic logic gates include: AND, OR, XOR, NOT, NAND, NOR, and XNOR.

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14. The ____ gate is a type of electrical circuit that produces a high output if all of its inputs are high.

  1. OR
  2. XOR
  3. NAND
  4. AND

Answer: D) AND

Explanation:

The AND gate is a type of electrical circuit that produces a high output if all of its inputs are high.

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15. How do we represent AND operation?

  1. Dot (.)
  2. Multiply (*)
  3. Plus (+)
  4. Minus (-)

Answer: A) Dot (.)

Explanation:

A dot (.) symbol represents the AND operation.

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16. ____ gates are electrical circuits that produce a high output if one or more of their inputs are high.

  1. OR
  2. XOR
  3. NAND
  4. OR

Answer: D) OR

Explanation:

OR gates are electrical circuits that produce a high output if one or more of their inputs are high.

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17. A ____ sign represents the operation performed by an OR gate.

  1. Dot (.)
  2. Multiply (*)
  3. Plus (+)
  4. Minus (-)

Answer: C) Plus (+)

Explanation:

A plus (+) sign represents the operation performed by an OR gate.

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18. Which of the following gate is also known as an inverter?

  1. NOR
  2. XOR
  3. NAND
  4. NOT

Answer: D) NOT

Explanation:

The NOT gate is an electrical circuit that outputs an inverted version of the input. It is additionally referred to as an inverter.

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19. Which of the following statement is true about NAND gate?

  1. If any of the inputs are low, the NAND gate produces a high output.
  2. If any of the inputs are high, the NAND gate produces a high output.
  3. If any of the inputs are low, the NAND gate produces a low output.

Answer: A) If any of the inputs are low, the NAND gate produces a high output.

Explanation:

If any of the inputs are low, the NAND gate produces a high output.

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20. Which of the following statement is True?

  1. If any of the inputs are high, the NOR gate produces a high output.
  2. If any of the inputs are low, the NOR gate produces a low output.
  3. If any of the inputs are high, the NOR gate produces a low output.

Answer: C) If any of the inputs are high, the NOR gate produces a low output.

Explanation:

If any of the inputs are high, the NOR gate produces a low output.

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21. The 'Exclusive-OR' gate is a circuit that produces a high output if either or both of its inputs are high.

  1. True
  2. False

Answer: B) False

Explanation:

The 'Exclusive-OR' gate is a circuit that produces a high output if either of its inputs is high but not both.

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22. Which of the following represents XOR operation?

  1. Circle
  2. A ringed minus sign
  3. A rigned plus sign
  4. A ringed dot

Answer: C) A ringed dot

Explanation:

An ringed plus sign represents the XOR operation.

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23. According to Annulment law, in Boolean algebra what will be the output of A.0?

  1. 0
  2. 1
  3. A

Answer: A) 0

Explanation:

According to annulment law: A.0=0, and A+1=1.

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24. According to the identity law, what will be the output of A+0?

  1. 1
  2. A
  3. 0
  4. None

Answer: B) A

Explanation:

According to identity law, A.1=A and A+0=A.

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25. How many inputs and outputs are required for a half-adder circuit?

  1. One binary input and two binary outputs
  2. Two binary inputs and two binary outputs
  3. One binary input and one binary output

Answer: B) Two binary inputs and two binary outputs

Explanation:

Two binary inputs and two binary outputs are required for a Half-adder circuit.

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26. Full-Adder circuit needs ____ inputs and ____ outputs.

  1. Three binary inputs and Three binary outputs.
  2. Two binary inputs and Three binary outputs.
  3. Four binary inputs and Three binary outputs.
  4. Three binary inputs and Two binary outputs.

Answer: D) Three binary inputs and Two binary outputs.

Explanation:

Full-Adder circuit needs three binary inputs and two binary outputs.

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27. The S-R flip flops stand for ____.

  1. Stand-Reset flip flops
  2. Store-Reset flip flops
  3. Set-Reset flip flop
  4. Send Reset flip flop

Answer: C) Set-Reset flip flop

Explanation:

S-R flip-flop stands for SET-RESET flip-flops.

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28. The SET-RESET flip-flop is made up of ____.

  1. Two NOR gates and three NAND gates.
  2. Three NOR gates and two NAND gates.
  3. One NOR gate and two NAND gates.
  4. Two NOR gates and two NAND gates.

Answer: D) Two NOR gates and two NAND gates.

Explanation:

The SET-RESET flip-flop is made up of two NOR gates and two NAND gates.

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29. When S=1 and R=0, the output is set to logic ____ in S-R flip flop?

  1. 0
  2. 1
  3. None

Answer: B) 1

Explanation:

When S=1 and R=0, the output is set to logic 1 in the S-R flip flop.

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30. When both S and R are set to logic 1, in S-R flip flop then what will be the result?

  1. 0
  2. 1
  3. Undefined

Answer: C) Undefined

Explanation:

When both S and R are set to logic 1, the result is an undefined state where the output is unpredictable.

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31. A D flip flop is also known as ____.

  1. Determined flip flop
  2. Defined Flip flop
  3. Datagram Flip flop
  4. Data flip flop

Answer: D) Data flip flop

Explanation:

A D flip-flop is also known as a Data flip-flop.

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32. What happens in the D flip-flop, When the clock input is high?

  1. The output remains in its previous state.
  2. The data from the input is transmitted to the output.

Answer: B) The data from the input is transmitted to the output.

Explanation:

When the clock input is high, the data from the input is transmitted to the output.

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33. How many inputs does a JK flip-flop have?

  1. 3
  2. 4
  3. 5
  4. 6

Answer: A) 3

Explanation:

A JK flip-flop has three inputs: J (set), K (reset), and CLK (clock).

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34. In JK flip flop, When J=1 and K=0, the output is set to logic ____.

  1. 0
  2. 1
  3. Undefined
  4. Toggles between Previous State

Answer: B) 1

Explanation:

When J=1 and K=0, the output is set to logic 1.

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35. In JK flip flop, When J and K are both set to logic 1 then what is the output?

  1. 0
  2. 1
  3. Undefined
  4. Toggles between Previous State

Answer: D) Toggles between Previous State

Explanation:

When J and K are both set to logic 1, the output toggles between its prior states.

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36. Which is more versatile between JK flip flop and SR flip flop?

  1. JK Flip flop
  2. SR Flip flop

Answer: A) JK Flip flop

Explanation:

The JK flip-flop is more versatile than the SR flip-flop since it can be used for both set and reset operations.

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37. A T flip flop is also known as ____.

  1. Timer flip flop
  2. Tough flip flop
  3. Trims flip flop
  4. Toggle flip flop

Answer: D) Toggle flip flop

Explanation:

A T flip flop is also known as a toggle flip flop.

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38. What is the overall power supply voltage for the TTL (Transistor-Transistor logic) circuit?

  1. 100 V
  2. 1 V
  3. 20 V
  4. 5 V

Answer: D) 5 V

Explanation:

The overall power supply voltage for the TTL circuit is 5 volts.

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39. What is the average propagation delay for a TTL circuit?

  1. 20 ns
  2. 30ns
  3. 9ns
  4. 18ns

Answer: C) 9ns

Explanation:

The average propagation delay for a TTL circuit is roughly 9ns.

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40. Shift register can be used for ____.

  1. Serial-to-parallel conversion
  2. Parallel-to-serial conversion
  3. Both
  4. None

Answer: C) Both

Explanation:

Shift register can be used for serial-to-parallel conversion and Parallel-to-serial conversion.

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41. The shift register, shifts the data in ____ direction.

  1. One direction only
  2. Both the direction

Answer: A) One direction only

Explanation:

A shift register only shifts data in one direction, either left or right.

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42. A combinational logic circuit that turns an input signal into a coded output signal is known as an ____.

  1. Encoder
  2. Decoder

Answer: A) Encoder

Explanation:

A combinational logic circuit that turns an input signal into a coded output signal is known as an encoder.

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43. A ____ has a single input, 'n' selection lines, and up to 2n outputs.

  1. De-multiplexer
  2. Multiplexer

Answer: A) De-multiplexer

Explanation:

A De-multiplexer has a single input, 'n' selection lines, and up to 2n outputs.

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44. An 8-to-1 multiplexer has eight input lines and ____ selection lines.

  1. One
  2. Two
  3. Three
  4. Eight

Answer: C) Three

Explanation:

An 8-to-1 multiplexer has eight input lines and three selection lines.

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45. A 1-to-8 demultiplexer has ____ input line and ____ output lines.

  1. Two input lines and eight output lines.
  2. Eight input lines and eight output lines.
  3. Eight input lines and one output line.
  4. One input line and eight output lines.

Answer: D) One input line and eight output lines.

Explanation:

A 1-to-8 demultiplexer has one input line and eight output lines.

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46. How many types of binary adders are there?

  1. 2
  2. 3
  3. 4
  4. 5

Answer: A) 2

Explanation:

There are two types of binary adder: Half adder, Full adder.

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47. Full adders are binary adders that add ____ binary numbers and output two bits, the sum, and the carry.

  1. One
  2. Two
  3. Three

Answer: C) Three

Explanation:

Full adders are binary adders that add three binary numbers and output two bits, the sum, and the carry.

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48. ____ memory is a sort of high-speed memory used to store frequently accessed data and instructions utilized by a computer's CPU (central processing unit).

  1. Cache memory
  2. Auxiliary memory
  3. Main memory

Answer: A) Cache memory

Explanation:

Cache memory is a sort of high-speed memory used to store frequently accessed data and instructions utilized by a computer's CPU (central processing unit).

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49. How many types of cache memory are there?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

Cache memory is classified into two types: instruction cache and data cache.

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50. Which of the following level of cache is the smallest and fastest?

  1. Level 4
  2. Level 3
  3. Level 2
  4. Level 1

Answer: D) Level 1

Explanation:

Level 1 cache is the smallest and the fastest.

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51. Which of the following is also known as Content Addressable Memory (CAM)?

  1. Auxiliary memory
  2. Magnetic tape
  3. Associative memory
  4. Cache memory

Answer: C) Associative memory

Explanation:

Associative memory is also known as Content Addressable Memory (CAM).

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52. How many types of mapping are used for cache memory?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: C) 3

Explanation:

There are three distinct forms of mapping used for cache memory, which are as follows:

  • Direct mapping,
  • Associative mapping
  • Set-Associative mapping

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53. Each cache location in ____ cache memory holds both the memory address and the contents.

  1. Direct mapping,
  2. Full Associative
  3. Set-Associative

Answer: B) Full Associative

Explanation:

Each cache location in fully associative cache memory holds both the memory address and the contents.

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54. How many types of pipelines are there in the computer?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

There are two types of pipelines in computer processing:

  • Instruction pipeline
  • Arithmetic pipeline

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55. Which of the following pipeline are used to accomplish floating-point operations, fixed-point multiplication, and other computations encountered in scientific situations?

  1. Instruction pipeline
  2. Arithmetic operation

Answer: B) Arithmetic operation

Explanation:

Arithmetic operations are used to accomplish floating-point operations, fixed-point multiplication, and other computations encountered in scientific situations.

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56. Serial communication can be classified into how many types?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

Serial communication can be classified into two types: synchronous and asynchronous.

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57. In memory-based addressing mode, the operand is stored in ____.

  1. Memory
  2. Register
  3. Serial Bus

Answer: A) Memory

Explanation:

In memory-based addressing mode, the operand is stored in memory.

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58. Which of the following mode is used when the operand is too large?

  1. Register-based addressing
  2. Memory-based addressing

Answer: B) Memory-based addressing

Explanation:

When the operand is too large to be put in a register, or when the data is stored in an array or table, memory-based addressing mode is utilized. When the operand is small and can be placed in a register, the register-based addressing mode is employed.

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59. Flash memory is a type of ____.

  1. Non-volatile memory
  2. Volatile memory

Answer: B) Volatile memory

Explanation:

Flash memory is a sort of computer storage technology that is non-volatile.

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60. Flash memory is based upon ____.

  1. MROM
  2. PROM
  3. EPROM
  4. EEPROM

Answer: D) EEPROM

Explanation:

Flash memory is based on a technology called EEPROM (electrically erasable programmable read-only memory).

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