UnderStand UPSC (11)
Youtube Instagram Whatsapp Linkedin X-twitter
UnderStand UPSC (11)
Login/Sign up
US
UnderStand UPSC Daily Current Affairs Practice
0.00Score / 10
0 / 6MCQs Attempted
0%Accuracy
7 October 2026 • UPSC CSE

Read the news. Test the concept. Write the Mains answer.

This interactive edition converts each current-affairs item into one Prelims-level MCQ, one Mains-level question, and a compact value-addition section for revision.

+2 correct −0.66 incorrect Explanation after attempt Image/PDF answer upload
⬇ Download PDF ▶ Watch Video
NEWS 1 GS3 • Science & Technology / Astronomy / Particle Physics Source: The Hindu

Nobel Prize in Physics 2026: IceCube Neutrino Observatory

Context: Francis Halzen received the 2026 Nobel Prize in Physics for his contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.

Neutrinos: Basic Understanding

Nature & abundance
Electrically neutral, extremely light subatomic particles that interact very weakly with matter; the second most abundant known particles in the universe, after photons.
Sources
Produced by the Sun, nuclear reactions and energetic cosmic events such as supernovae and active galaxies.

IceCube Neutrino Observatory

Location & setup
Built beneath the South Pole, Antarctica, using nearly one cubic kilometre of Antarctic ice as a detector; contains around 5,160 optical sensors embedded deep in the ice.
Purpose
Detects high-energy cosmic neutrinos and helps identify the distant astrophysical sources from which they originate.

How It Detects Neutrinos

Detection mechanism
A neutrino occasionally collides with an atomic nucleus in the ice, producing a charged particle, which emits Cherenkov radiation — a faint blue flash — while moving through the ice; optical sensors record this light to estimate direction and energy.

Major Breakthroughs & Significance

Key discoveries
2013: first detection of high-energy cosmic neutrinos from outside the Solar System; 2018: a high-energy neutrino linked to a distant blazar (active galaxy powered by a supermassive black hole).
Significance
Established neutrino astronomy as a new way to study extreme cosmic phenomena, offering a window beyond conventional light-based astronomy.
Key Takeaway: IceCube's genius is turning an entire cubic kilometre of Antarctic ice into a detector — since neutrinos barely interact with matter, you need an enormous volume of something transparent and still, and Cherenkov radiation from the rare collision is the only clue that one passed through.

Prelims Practice MCQ

+2 correct • −0.66 wrong

Consider the following statements:
1. Neutrinos are the most abundant known particles in the universe.
2. The IceCube Neutrino Observatory is located beneath the South Pole, Antarctica.
3. In 2018, a high-energy neutrino detected by IceCube was linked to a distant blazar.

Which of the statements given above is/are correct?

Explanation: Statements 2 and 3 are correct. Statement 1 is incorrect — neutrinos are the second most abundant known particles, after photons.

UPSC Mains Question

10 Marks • 150 Words

Explain how the IceCube Neutrino Observatory detects high-energy cosmic neutrinos and discuss the significance of neutrino astronomy for studying extreme cosmic phenomena.

Attempt before opening the value-addition tab.
Accepted: JPG, JPEG, PNG, WEBP or PDF. The standalone file previews your answer locally; connect the API hook for real server submission.
Use after attempting the Mains answer
  • State neutrinos' key properties precisely — electrically neutral, weakly interacting, second most abundant particle.
  • Name the detection mechanism explicitly — Cherenkov radiation from charged particles produced by rare neutrino-nucleus collisions.
  • Cite IceCube's exact scale — ~1 cubic km of ice, ~5,160 optical sensors — for quantitative precision.
  • Sequence the two breakthroughs (2013 first cosmic neutrinos, 2018 blazar link) with their specific significance.
  • Frame neutrino astronomy as a complement to electromagnetic (light-based) astronomy, not a replacement.
NEWS 2 GS2 • Indian Polity / Constitution / Judiciary Source: The Hindu

Supreme Court Strength Rises to 37 Judges

Context: Three new judges took oath, raising the Supreme Court's working strength to 37 against its sanctioned strength of 38, amid pendency of nearly one lakh cases.

Supreme Court Strength

Current numbers
Sanctioned strength: 38 judges (CJI + 37 other judges); working strength: 37 judges after three new appointments, leaving one vacancy.
Legal basis
Supreme Court (Number of Judges) Amendment Act, 2019 — increased sanctioned strength from 31 to 34; subsequently increased to 38.

Appointment of Supreme Court Judges

Process
Article 124: the President formally appoints Supreme Court judges; the Collegium system — CJI and four senior-most SC judges — recommends appointments.
Government's role
The Union Government processes recommendations; if the Collegium reiterates a recommendation after reconsideration, established convention is to accept it.

Case Pendency & Significance of Appointments

The backlog
Nearly one lakh cases pending before the Supreme Court; major causes include vacancies, repeated adjournments, procedural delays and increasing litigation.
Why appointments matter
Enable faster disposal via additional benches; adequate strength helps constitute larger benches for constitutional questions; must be paired with better case management.
Key Takeaway: A pendency of nearly one lakh cases against a sanctioned strength of just 38 judges puts the scale problem in perspective — three new appointments help, but the backlog shows judicial strength alone can't fix delays without better case management and fewer adjournments alongside it.

Prelims Practice MCQ

+2 correct • −0.66 wrong

Consider the following statements:
1. The sanctioned strength of the Supreme Court is 38 judges, including the Chief Justice of India.
2. The Supreme Court (Number of Judges) Amendment Act, 2019 increased the sanctioned strength from 31 to 34 judges.
3. Under the established convention, if the Collegium reiterates a recommendation after reconsideration, the government does not accept it.

Which of the statements given above is/are correct?

Explanation: Statements 1 and 2 are correct. Statement 3 is incorrect — the established convention is to accept a reiterated Collegium recommendation, not reject it.

UPSC Mains Question

10 Marks • 150 Words

Discuss the process of appointment of Supreme Court judges in India and examine the significance of maintaining adequate judicial strength for reducing case pendency.

Attempt before opening the value-addition tab.
Accepted: JPG, JPEG, PNG, WEBP or PDF. The standalone file previews your answer locally; connect the API hook for real server submission.
Use after attempting the Mains answer
  • State the exact strength figures — 38 sanctioned, 37 working, one vacancy — precisely.
  • Cite the 2019 Amendment Act and its specific change (31→34, later to 38) for legislative-history precision.
  • Name Article 124 and the Collegium system (CJI + 4 senior-most judges) as the appointment mechanism.
  • Note the 'reiteration convention' explicitly — government accepts a reiterated recommendation — a frequently tested nuance.
  • List pendency's causes (vacancies, adjournments, procedural delays, rising litigation) and link appointments to larger-bench capacity for constitutional cases.
NEWS 3 GS3 • Infrastructure, Transport, Economic Development; GS1 • Indian Society Source: The Hindu

National Household Travel Survey: Buses Dominate Overnight Travel

Context: India's first National Household Travel Survey, conducted by the National Statistics Office (NSO) between July 2025 and June 2026, provides nationwide evidence on travel patterns, commuting costs and mobility inequalities.

Key Findings & Survey Coverage

Travel mode shares
Buses account for 55.8% of overnight household journeys, followed by railways at 17.7%; two-wheelers account for 42.6% of work-related journeys nationally.
Coverage
Surveyed 4,92,023 households and 20,34,371 people across 14,274 villages and 10,377 urban blocks.

Rural-Urban Differences

Rail & two-wheeler use
~22.7% of urban households use rail for overnight journeys vs ~14% of rural households; two-wheelers account for 52.3% of urban workers' journeys vs 37.1% in rural areas.

Commuting Costs and Gender Gaps

Expenditure
Average commuting expenditure: ₹785/worker (₹1,044 urban vs ₹612 rural).
Gender gaps
61.9% of male workers undertake journeys exceeding 1 km vs 41.9% of female workers; male workers spend ₹835/month on commuting vs ₹533 for female workers.

Significance

Why it matters
Enables evidence-based transport planning and sustainable mobility (better bus/rail networks); highlights rural-urban and gender disparities for inclusive connectivity; supports economic productivity through reliable, affordable transport.
Key Takeaway: Buses carrying 55.8% of overnight journeys — more than three times rail's 17.7% — is the headline finding, but the gender gap in both mobility (61.9% vs 41.9%) and spending (₹835 vs ₹533) is the quieter, equally important signal about who gets to travel and at what cost.

Prelims Practice MCQ

+2 correct • −0.66 wrong

Consider the following statements:
1. Buses accounted for the largest share of overnight household journeys in the National Household Travel Survey.
2. A higher proportion of male workers than female workers undertook work-related journeys exceeding one kilometre.
3. Average monthly commuting expenditure was higher in rural areas than in urban areas.

Which of the statements given above is/are correct?

Explanation: Statements 1 and 2 are correct. Statement 3 is incorrect — average commuting expenditure was higher in urban areas (₹1,044) than rural areas (₹612).

UPSC Mains Question

10 Marks • 150 Words

Discuss the key findings of India's first National Household Travel Survey and examine their significance for evidence-based transport planning and inclusive mobility.

Attempt before opening the value-addition tab.
Accepted: JPG, JPEG, PNG, WEBP or PDF. The standalone file previews your answer locally; connect the API hook for real server submission.
Use after attempting the Mains answer
  • Use the precise mode-share figures — 55.8% bus/17.7% rail (overnight), 42.6% two-wheeler (work journeys) — for quantitative precision.
  • Cite the exact survey coverage — 4,92,023 households, 20,34,371 people, 14,274 villages, 10,377 urban blocks — to show scale.
  • Note the rural-urban contrasts (rail: 22.7% vs 14%; two-wheelers: 52.3% vs 37.1%) as a paired comparison.
  • State both gender gaps — mobility (61.9% vs 41.9%) and spending (₹835 vs ₹533) — as two distinct but related findings.
  • Link the survey's significance to sustainable mobility, inclusive connectivity and regional economic productivity.
NEWS 4 GS3 • Defence Technology / Indigenous Manufacturing / Maritime Security Source: The Hindu

Surya: India's First Indigenous Fleet Support Ship

Context: Defence Minister Rajnath Singh launched Surya, the Indian Navy's first indigenous Fleet Support Ship (FSS), at Hindustan Shipyard Limited (HSL), Visakhapatnam, strengthening naval logistics and defence self-reliance.

Fleet Support Ship: Role & Indigenous Content

What it does
Supplies fuel, fresh water, ammunition, spare parts and other essential stores to warships at sea; enables extended deployment without returning to port; can support multiple warships simultaneously.
Indigenous content
Incorporates 82% indigenous content, supporting domestic defence manufacturing.

Key Project Details

Contract & capacity
₹19,000-crore contract between the Ministry of Defence and HSL for five indigenous Fleet Support Ships; designed to carry up to 20,000 tonnes of high-speed diesel and 2,500 tonnes of aviation turbine fuel.
Shipyard upgrade
HSL upgraded infrastructure including Slipway No. 4 and a 300-tonne Goliath crane, supporting construction of larger vessels.

Significance & Way Forward

Significance
Maritime endurance for prolonged deployment; defence self-reliance (reduced foreign dependence); industrial development (shipyards, employment); strategic reach across the Indian Ocean Region; supports Aatmanirbhar Bharat.
Way forward
Expand indigenous propulsion/critical-component production; ensure timely delivery of all five ships; develop Indian shipyards as globally competitive suppliers.
Key Takeaway: A Fleet Support Ship isn't a combat vessel, but it's what makes sustained naval operations possible — without Surya's ability to replenish fuel and supplies at sea, Indian Navy ships would need to return to port far more often, which is exactly the strategic-reach gap this fills across the Indian Ocean Region.

Prelims Practice MCQ

+2 correct • −0.66 wrong

Consider the following statements:
1. Surya is designed to provide at-sea replenishment of fuel, water and supplies to warships.
2. Surya incorporates 82% indigenous content.
3. The contract for five indigenous Fleet Support Ships is valued at ₹19,000 crore.

Which of the statements given above is/are correct?

Explanation: All three statements are correct, describing Surya's role, indigenous content and contract value accurately.

UPSC Mains Question

10 Marks • 150 Words

Discuss the significance of the indigenous Fleet Support Ship Surya for India's naval logistics and defence self-reliance.

Attempt before opening the value-addition tab.
Accepted: JPG, JPEG, PNG, WEBP or PDF. The standalone file previews your answer locally; connect the API hook for real server submission.
Use after attempting the Mains answer
  • State the exact figures — 82% indigenous content, ₹19,000 crore for five ships, 20,000 tonnes diesel/2,500 tonnes ATF capacity.
  • Name Hindustan Shipyard Limited (HSL), Visakhapatnam and the Slipway No. 4/300-tonne Goliath crane upgrade specifically.
  • List the five significance points — maritime endurance, self-reliance, industrial development, strategic reach, Aatmanirbhar Bharat — individually.
  • Explain the FSS's functional role precisely — at-sea replenishment enabling extended deployment, not a combat function.
  • Link Surya explicitly to India's Indian Ocean Region strategic reach, not just naval logistics in isolation.
NEWS 5 GS3 • Science & Technology / Space Technology / Nuclear Energy / International Relations Source: The Hindu

NASA's Plan for a Nuclear Reactor on the Moon

Context: NASA aims to deploy a nuclear reactor near the Moon's south pole by 2030 to provide reliable power for long-duration lunar missions, reflecting growing competition to establish sustained human and scientific activity on the Moon.

Why the Moon Needs Nuclear Power

The problem with solar
Lunar night lasts approximately 14 Earth days, limiting solar-power reliability; habitats need continuous electricity for heating, life-support, communications and equipment.
Applications
Supports rover operations during darkness and lunar resource utilisation — electricity to extract water ice and process it into hydrogen and oxygen — essential for future settlements.

Proposed Lunar Nuclear Reactors

The competing plans
NASA's reactor: ~20 kW, targeted for 2030; China-Russia's International Lunar Research Station (ILRS) plans a reactor of ~10 kW.
Siting
The lunar south pole is prioritised for water-ice deposits and favourable illumination; NASA research recommends siting reactors at least 1 km from human habitats.

Technical Challenges & Legal-Geopolitical Concerns

Technical challenges
Radiation protection, heat dissipation in near-vacuum, safe transportation/assembly, lunar in-situ manufacturing, accident prevention.
Legal framework
Outer Space Treaty, 1967 prohibits national appropriation of the Moon; the Artemis Accords support peaceful exploration and temporary safety zones while respecting free access.

Significance

Broader implications
Enables sustained lunar exploration independent of sunlight; supports a future space economy (mining, propellant production); tests whether international space law can manage strategic competition while preserving peaceful access.
Key Takeaway: The legal tension here is sharper than the engineering one — the Outer Space Treaty bars national appropriation of the Moon, but a country operating reactors, landing pads and habitats near the south pole's water-ice deposits could gain practical de facto control without ever formally claiming sovereignty.

Prelims Practice MCQ

+2 correct • −0.66 wrong

Consider the following statements:
1. A lunar night lasts approximately 14 Earth days.
2. NASA's proposed lunar reactor is targeted to produce a higher power output than the China-Russia ILRS reactor plan.
3. The Outer Space Treaty, 1967 permits national appropriation of the Moon through occupation.

Which of the statements given above is/are correct?

Explanation: Statements 1 and 2 are correct. Statement 3 is incorrect — the Outer Space Treaty prohibits, not permits, national appropriation of the Moon.

UPSC Mains Question

10 Marks • 150 Words

Discuss the rationale for deploying nuclear reactors on the Moon and examine the legal and geopolitical concerns associated with such initiatives.

Attempt before opening the value-addition tab.
Accepted: JPG, JPEG, PNG, WEBP or PDF. The standalone file previews your answer locally; connect the API hook for real server submission.
Use after attempting the Mains answer
  • State the 14-Earth-day lunar night and NASA's ~20kW (2030 target) vs ILRS's ~10kW reactor plans precisely.
  • Name the Outer Space Treaty (1967) and Artemis Accords as the two relevant legal frameworks with distinct provisions.
  • Explain the 'de facto control' risk explicitly — practical advantage without formal sovereignty claims — the article's key geopolitical point.
  • List the five technical challenges (radiation, heat dissipation, transportation, lunar manufacturing, accident prevention) individually.
  • Cite the 1km habitat-distance siting recommendation and the south pole's water-ice significance for lunar resource utilisation.
NEWS 6 GS3 • Indian Economy / Taxation / Ease of Doing Business Source: The Hindu

Five-Pronged GST Reform Plan

Context: The Centre has proposed five areas of Goods and Services Tax (GST) reform to simplify compliance, reduce administrative burdens and support small businesses and service exporters.

GST: Concept and Constitutional Basics

Basics
A destination-based indirect tax on the supply of goods/services, replacing several central/state indirect taxes; introduced via the 101st Constitutional Amendment Act, 2016; Article 279A provides for the GST Council.
Council & voting
Chaired by the Union Finance Minister; quorum needs one-half of members; decisions need three-fourths weighted votes — Centre has one-third weight, States collectively two-thirds.
Types
CGST/SGST for intra-State supplies; IGST for inter-State supplies/imports; UTGST for Union Territories without legislatures.

The Five Areas of Reform

Process & structural reforms
Automate invoice matching, simplify ITC claims, reduce paperwork; simplify registration for small businesses operating across multiple States.
Ease, exports & e-commerce
Allow eligible small taxpayers (B2C only) to file annual instead of monthly returns; clarify rules so services via overseas branches may qualify as exports; simplify GST procedures for online sellers, especially small businesses.

Significance

Key benefits
Lower compliance burden especially for small businesses; easier registration/filing supports business expansion and formalisation; clearer export rules improve service-export competitiveness; automated invoice matching strengthens digital tax administration.
Key Takeaway: Letting small B2C taxpayers file annual instead of monthly returns is a deceptively simple change with outsized impact — compliance cost falls from twelve filings a year to one, which is exactly the kind of administrative friction that discourages small businesses from formalising in the first place.

Prelims Practice MCQ

+2 correct • −0.66 wrong

Consider the following statements:
1. GST was introduced in India through the 101st Constitutional Amendment Act, 2016.
2. Decisions in the GST Council require at least three-fourths of the weighted votes of members present and voting.
3. CGST and SGST apply to inter-State supplies of goods and services.

Which of the statements given above is/are correct?

Explanation: Statements 1 and 2 are correct. Statement 3 is incorrect — CGST and SGST apply to intra-State supplies; IGST applies to inter-State supplies and imports.

UPSC Mains Question

10 Marks • 150 Words

Discuss the five areas of proposed GST reform and examine their significance for ease of doing business and compliance simplification in India.

Attempt before opening the value-addition tab.
Accepted: JPG, JPEG, PNG, WEBP or PDF. The standalone file previews your answer locally; connect the API hook for real server submission.
Use after attempting the Mains answer
  • Cite the 101st Amendment Act (2016) and Article 279A (GST Council) as the precise constitutional basis.
  • State the Council's voting rule exactly — three-fourths weighted votes, Centre 1/3, States 2/3 collectively — a frequently tested mechanism.
  • Distinguish CGST/SGST (intra-State) from IGST (inter-State/imports) and UTGST precisely.
  • List all five reform areas — process, structural, ease of living, service exports, e-commerce — individually with their specific changes.
  • Frame the significance around formalisation and export competitiveness, not just 'reduced paperwork' generically.

← Browse all UPSC Current Affairs editions

UnderStand UPSC logo

A Platform OF The Students
For The Students
By The Students

Follow Us On:

Instagram Youtube Linkedin Whatsapp X-twitter

Student Desk

Student Testimonial

Our Courses

Syllabus

Help Desk

Login

Contact Us

Support

FAQs

Terms & Conditions

Terms & Conditions Of Enrolment

Privacy Policy

Cancellation/ Refund Policy

Career

Free Resources

Daily Current Affairs

UPSC PYQ

UPSC Prelims Quizzes

UPSC Static Quizzes

Static Content Revision

UPSC CSE GS Mains Micro-Syllabus

NCERT Books

IGNOU

NIOS

Demo Lectures

Strategy

Blog

Download Our App

UnderStand UPSC android Old app
UnderStand UPSC iphone Old app

Copyright © 2026 USARAMBHA EDUCATION (UnderStand UPSC). All Rights Reserved.