Computer Architecture Week 1 NPTEL Assignment Answers 2025

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✅ Subject: Computer Architecture
📅 Week: 1
🎯 Session: NPTEL 2025 July-October
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NPTEL Computer Architecture Week 1 Assignment Answers 2025

1. Which of the following best describes the “language of instructions”?

• The high level programming language used to write applications
• The set of binary encoded operations that a CPU can execute
• The human readable assembly mnemonics for debugging
• The scripting language embedded in an operating system

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2. The Instruction Set Architecture (ISA) defines all of the following EXCEPT:

• Number of registers
• Data types and addressing modes
• Logic gate implementations of ALU circuits
• Instruction formats and op codes

Answer :

3. Which feature of an ISA refers to having exactly one unique encoding for each operation?

• Completeness
• Conciseness
• Genericness
• Simplicity

Answer :

4. An ISA is said to be “complete” if it allows programs to implement:

• Any computation that a Turing machine can perform (subject to available memory)
• Only arithmetic and logical operations
• Only user defined data types
• Branching but not looping constructs

Answer :

5. A Universal Turing Machine (UTM) is one that:

• Can solve any problem in constant time
• Can simulate any other Turing machine given its description
• Has an infinite tape divided into cells of varying sizes
• Operates with multiple read/write heads simultaneously

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6. Which of the following is a hallmark of RISC architectures as compared to CISC?

• A large instruction set (500+ instructions) with highly irregular formats
• Simple, regularly structured instructions and a small opcode space (64–128 instructions)
• Instructions that can directly execute high level language constructs like string moves
• Microcoded control units for each complex instruction

Answer :

7. Which pairing of processor and ISA type is correct?

• Intel x86 – RISC
• ARM – CISC
• IBM PowerPC – RISC
• VAX – RISC

Answer :

8. Which of the following correctly contrasts Harvard and Von Neumann architectures?

• Harvard has a unified memory for instructions and data, Von Neumann separates them
• Harvard uses multiple ALUs, Von Neumann uses a single ALU
• Harvard separates instruction and data memories , Von Neumann uses a single memory space
• Harvard is exclusively used in general purpose CPUs, Von Neumann only in DSPs

Answer :

9. Which of the following is a primary advantage of the Harvard architecture over Von Neumann?

• Simpler control logic
• Lower hardware cost
• Simultaneous instruction and data access
• Unified memory management

Answer :

10. In which architecture is the “bottleneck” between CPU and memory most often discussed?

• Harvard
• Von Neumann
• SIMD
• RISC

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NPTEL Computer Architecture Week 1 Assignment Answers 2024

1. A/An _____________ is defined as a basic command that can be given to a computer.

Options:
A. Instruction
B. Executable
C. Register
D. Program counter
✅ Answer: A. Instruction
Explanation:
An instruction is the fundamental command that tells a computer what to do. It can perform operations like addition, data movement, etc.

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2. When we turn off the power, the ____________ loses all its data.

Options:
A. Processor
B. Hard disk
C. USB drive
D. None of the options
✅ Answer: A. Processor
Explanation:
The processor’s memory (such as cache and registers) is volatile, meaning it loses all data once power is off. Hard disk and USB drives retain data.

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3. An equivalent representation for the Boolean expression A ⊕ 1 is __________. (‘ denotes complement)

Options:
A. A’
B. 1
C. A
D. 0
✅ Answer: A. A’
Explanation:
A XOR 1 gives the inverse of A. So, A ⊕ 1 = A’.

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4. Convert (01110110111)₂ to the hexadecimal format.

Options:
A. 0x62E
B. 0x76E
C. 0x767
D. 0x3B7
✅ Answer: D. 0x3B7
Explanation:
Group the binary as 000 011 101 101 111 = 0 3 B 7 → Hex = 0x3B7

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5. Simplification of the Boolean expression (AB + A’C + AD + B’C + BC) yields ________.

Options:
A. AB + AD + D
B. AB + AD + C
C. AB + C
D. AD
✅ Answer: B. AB + AD + C
Explanation:
The expression simplifies by applying Boolean algebra rules (combining terms) to reduce to: AB + AD + C

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6. Which of the following expressions represents the associativity law in Boolean algebra?

Options:
A. A.(B+C) = A.B + A.C
B. A + (B+C) = (A+B) + C
C. A + 1 = 1
D. (A+B)’ = A’.B’
✅ Answer: B. A + (B+C) = (A+B) + C
Explanation:
Associativity law allows regrouping: A + (B + C) = (A + B) + C

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7. Convert (1022)₈ to the decimal format.

Options:
A. (512)₁₀
B. (1042)₁₀
C. (530)₁₀
D. (420)₁₀
✅ Answer: C. (530)₁₀
Explanation:
(1022)₈ = 1×8³ + 0×8² + 2×8¹ + 2×8⁰ = 512 + 0 + 16 + 2 = 530

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8. The _____________ transforms a program written in a high-level language such as C to a program consisting of basic machine instructions.

Options:
A. Compiler
B. Assembler
C. Linker
D. Loader
✅ Answer: A. Compiler
Explanation:
A compiler converts high-level source code to low-level machine code.

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9. The ___________ refers to the semantics of all the instructions supported by a processor.

Options:
A. Instruction set architecture (ISA)
B. Compiler
C. Turing machine
D. Processor design
✅ Answer: A. Instruction set architecture (ISA)
Explanation:
ISA defines the set of instructions a processor can execute — its instruction vocabulary.

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10. A ___________ is a list of instructions given to the computer.

Options:
A. Instruction set architecture (ISA)
B. Program
C. Process
D. None of the options
✅ Answer: B. Program
Explanation:
A program is a collection of instructions designed to perform a specific task.