IEMCET computing preparation: Fixed-width two's complement — practice worksheet with answers

How to use this worksheet

This independent worksheet checks fixed-width two's complement with a new problem, an explanation task and an interleaved related skill. It is not an official IEM question paper, a difficulty forecast or a prescribed timed examination.

Write an attempt first, then compare your method with the visible answers. Record whether a miss came from interpretation, a missing concept, execution or a condition you overlooked.

Question 1: apply the topic

What is the eight-bit two's-complement representation of −1?

Answer and checking point

11111111.

Trace a small example and a boundary case. Distinguish correctness from complexity, a necessary condition from a sufficient one, and declared constraints from coincidences in sample data. Check whether the question asks for an exact count, a bound or a qualitative property.

Question 2: diagnose an approach

Explain why the following warning matters and identify the correction it calls for: The same bit pattern can have different values under unsigned and signed interpretations.

Model checkpoint: Two's-complement values require a specified bit width. The highest bit has a negative weight. Governing rule: For n bits, signed range is −2ⁿ⁻¹ to 2ⁿ⁻¹−1.

Question 3: transfer to tcp and udp service distinctions

Does choosing UDP guarantee a lower application-level delay in every real network?

Answer: No. Application design, loss and network conditions still matter.

This is an interleaved related-skill task, not a claim that the two topics have identical methods. Explain which idea changes when switching from the main topic to this one.

Review the attempt

Separate correct answers reached with a justified method from lucky guesses. Rework missed steps without looking at the answer, then use a fresh problem from an appropriate primary textbook or official paper. Do not use a small worksheet result as an admission cutoff, rank or readiness guarantee.

Official sources and verification

Sources checked on 26 October 2026. A source’s date, programme and campus limit which claims it supports. Official pages may change after review.

1. UEM Kolkata — IEMCET 2026 syllabus and instructions

   Historical course-specific preparation guidance. Some introductory route text conflicts with the central portal.

2. WBJEEB — JECA 2026 information bulletin

   2026 MCA syllabus and institution modules; Appendix 10 includes IEM Salt Lake. Historical, not a 2027 seat guarantee.

3. IIT Madras — GATE 2027 Computer Science syllabus

   Current GATE CS topic reference; IEMCET adoption of every 2027 revision is not asserted. MCA eligibility and programme paper instructions remain separate.

Found a discrepancy? Send the page and the official notice for correction.