UPSC Mains 2021 GS3 Q16 — Science and Technology
The Nobel Prize in Physics of 2014 was jointly awarded to Akasaki, Amano and Nakamura for the invention of Blue LEDs in 1990s. How has this invention impacted the everyday life of human beings ? (Answer in 250 words)
Question Decoded — examiner's intent
- Directive verbs
- How has
- Scope keywords
- Nobel Prize in Physics of 2014Akasaki, Amano and Nakamurainvention of Blue LEDs1990simpacted the everyday life of human beings
- Implicit sub-parts
- The scientific significance: Why was the 'Blue' LED specifically harder to achieve than Red or Green?
- The mechanism of White Light: How Blue LEDs enabled the transition from monochromatic light to energy-efficient white light sources.
- Socio-economic impacts: Energy efficiency, cost reduction, and carbon footprint.
- Technological impacts: Revolution in display technology, communication (Li-Fi), and data storage.
- Humanitarian impacts: Bringing light to off-grid rural areas via solar-powered LEDs.
- Common pitfalls
- Spending too many words on the biographies of the scientists or the history of the Nobel Prize rather than the impact.
- Failing to explain the technical bridge between 'Blue LED' and 'White Light', which is the core of its everyday utility.
- Over-focusing on industrial applications while ignoring 'everyday life' aspects like smartphones and health.
- A generic 'science is good' essay without mentioning specific modern use-cases like Blu-ray, backlighting, or sterilization.
- Dimensions required
- Energy and EnvironmentEconomic and HouseholdTechnological and DigitalHealth and Well-beingGlobal Development
- Marks allocation hint
Allocate roughly 50 words to the technical breakthrough and why Blue LEDs were the 'missing piece' for white light. Devote the remaining 200 words to a multi-dimensional analysis of impacts, ensuring at least four distinct sectors (lighting, electronics, environment, and development) are covered to secure the full 15 marks.
Unlock the full analysis for this question
You've seen the question and its examiner-intent decoding. Subscribers also get:
- 🔗 Similar Previous Year Questions — cross-year, cross-paper matches so you study the topic, not the question
- 📚 Source Map — verified citations from Laxmikanth, NCERT, PRS, Yojana, Economic Survey, Spectrum
- 🌱 How this topic is evolving — current-affairs bridge anchored to live TARS news clustering
- 🧭 Examiner's Pattern — how the topic has been framed across every year UPSC has tested it
- ✍️ Answer Skeleton — a structured outline (intro → body → conclusion) you can flesh out
- 🎯 AI evaluation — write your answer, get rubric-based scoring from gs-eval
Or browse 132+ free preview questions across all years and papers — the first 3 questions of every paper are unlocked.
Ready to practice?
Subscribers can attempt this question in 250 words and get an instant, rubric-based evaluation showing where they stand.
Subscribe to evaluate your answer →