DataEngPrep.tech
QuestionsPracticeAI CoachDashboardPacksBlog
ProLogin
Home/Questions/General/Other/Light Bulb Problem: Three switches outside a room control three bulbs inside. Determine which switch controls which bulb with minimal trials.

Light Bulb Problem: Three switches outside a room control three bulbs inside. Determine which switch controls which bulb with minimal trials.

General/Othereasy0.3 min read

Use heat as a second observable. Turn switch 1 ON for 10 min, OFF. Turn switch 2 ON. Enter room. Bulb OFF and warm = switch 1; ON = switch 2; OFF and cold = switch 3. Minimal trials: one entry. WHY: Systematic thinking—leverage multiple dimensions (light, heat) to disambiguate...

🤖 Analyze Your Answer
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
ZS Associates

Why This Question Matters

This easy-level General/Other question appears frequently in data engineering interviews at companies like ZS Associates. While less common, it tests deeper understanding that distinguishes strong candidates.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
58 words

Use heat as a second observable. Turn switch 1 ON for 10 min, OFF. Turn switch 2 ON. Enter room. Bulb OFF and warm = switch 1; ON = switch 2; OFF and cold = switch 3. Minimal trials: one entry. WHY: Systematic thinking—leverage multiple dimensions (light, heat) to disambiguate with minimal actions. Demonstrates decomposition and constraint satisfaction.

dataengprep.techdataengprep.techdataengprep.techdataengprep.tech
dataengprep.techdataengprep.techdataengprep.techdataengprep.tech
dataengprep.techdataengprep.techdataengprep.techdataengprep.tech
dataengprep.techdataengprep.techdataengprep.techdataengprep.tech
dataengprep.techdataengprep.techdataengprep.techdataengprep.tech
dataengprep.techdataengprep.techdataengprep.techdataengprep.tech

Want feedback on your answer?

Paste your answer to this question and our AI Coach scores it, finds gaps, and shows you the FAANG-level version.

Try Answer Analyzer →
Want all answers as a PDF for offline study?
1,863 questions across 7 categories — Interview Packs →

Free: Top 20 SQL Interview Questions (PDF)

Get the most asked SQL questions with expert answers. Instant download.

No spam. Unsubscribe anytime.

Related General/Other Questions

hardHave you worked on Data Warehousing projects?FreemediumHow would you read data from a web API? What steps would you follow after reading the data?FreehardRetrieve the most recent sale_timestamp for each product (Latest Transaction).FreehardWhat is the difference between OLTP and OLAP?FreemediumWhat is the difference between SQL and NoSQL databases?Free

Companies that ask this General/Other question

ZS Associates interview questions →

Want to know if YOUR answer is good enough?

Paste your answer and get instant AI feedback with a FAANG-level improved version.

Analyze My Answer — Free

According to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

← Back to all questionsMore General/Other questions →