Correct Answer: Option (c)

Alternative Powertrain = any propulsion system that replaces the conventional internal combustion engine (ICE) running on petrol/diesel

• All three vehicle types eliminate or significantly reduce dependence on fossil-fuel ICEs

Core Insight: Any vehicle that replaces the fossil-fuel ICE — whether via battery, hydrogen, or hybrid fuel cell — qualifies as an alternative powertrain vehicle.

Correct Answer: Option (c) World Economic Forum

Explanation:

Global Competitiveness Report is published by the World Economic Forum (WEF).

It assesses countries on factors like institutions, infrastructure, macroeconomic stability, and innovation.

Other reports:

→ IMF: World Economic Outlook (WEO), Global Financial Stability Report (GFSR)

→ UNCTAD: World Investment Report

→ World Bank: Ease of Doing Business, World Development Report

Core Insight: Global Competitiveness Report is a key WEF publication—important to distinguish from IMF, World Bank, and UNCTAD reports.

Correct Answer: Option (d)

UAV = Unmanned Aerial Vehicle; includes a wide range of designs — rotary-wing (quadcopters), fixed-wing (airplane-type), and hybrid

→ “All types” is the trap word here — one exception makes the statement false

Correct Answer: Option (a) 1 and 2 only

• Statement 1 ✅ The East India Company lost its trade monopoly in India, except for tea trade and trade with China.
• Statement 2 ✅ The Act asserted the sovereignty of the British Crown over Company’s Indian territories.
• Statement 3 ❌ Control over Indian revenues was established earlier by the Pitt’s India Act 1784, not by the 1813 Act

Core Insight: Charter Act 1813 ended EIC’s trade monopoly (except tea & China) and affirmed Crown sovereignty, but revenue control came earlier under Pitt’s India Act (1784).

Correct Answer: Option (c)

Explanation:

Battery Cathode = positive electrode where lithium ions are received during discharge

→ The key distinction here is Cathode vs Anode — Graphite is the classic anode material, not cathode

• (I) ✅ — Cobalt is a core cathode component; used in LCO (Lithium Cobalt Oxide) and NMC chemistries; enhances thermal stability and energy density
• (II) ❌ — Graphite is used in the anode, not cathode; it hosts lithium ions during charging via intercalation
• (III) ✅ — Lithium is integral to cathode structure (LiCoO₂, LiFePO₄, LiNiMnCoO₂); acts as the charge carrier shuttling between electrodes
• (IV) ✅ — Nickel is used in high-performance cathodes like NMC and NCA; boosts energy density and reduces cobalt dependence

Core Insight: In EV batteries — Cathode = Cobalt + Lithium + Nickel; Anode = Graphite. Graphite is the odd one out and the most common trap in this question.

Correct Answer: Option (a)

Explanation:

• 21st June = Summer Solstice (Northern Hemisphere)
• → Sun’s rays fall vertically over Tropic of Cancer (23.5° N)

Arctic Circle ✅

• → Experiences Midnight Sun → Sun does not set below the horizon

Antarctic Circle ❌

• → Experiences polar night (sun does not rise)

Equator / Tropic of Capricorn ❌

• → Overhead sun occurs during equinox (Equator) and Dec solstice (Capricorn)

Core Insight: On 21 June, Northern Hemisphere tilts toward the Sun—leading to midnight sun at the Arctic Circle.

Correct Answer: Option (b)

Explanation:

Coal Gasification = conversion of coal into syngas (CO + H₂ mixture) which acts as a feedstock for producing various chemicals and fuels

→ The key is identifying which substances can be derived — directly or indirectly — from syngas

• (I) ✅ — Syngas can be catalytically converted or fermented into ethanol; coal gasification is a valid production route
• (II) ❌ — Nitroglycerine (C₃H₅N₃O₉) is synthesised from glycerol + nitric acid; no connection to syngas or coal-based feedstock whatsoever
• (III) ✅ — Urea requires ammonia + CO₂; ammonia is made from hydrogen extracted from syngas (via Haber process) + atmospheric nitrogen; coal gasification indirectly enables urea production

Core Insight: Coal gasification produces syngas (CO + H₂) — remember key derivatives: Methanol, Ammonia, Ethanol, Hydrogen, Synthetic Gas; Nitroglycerine is never a syngas product — it’s an acid-based synthesis.

Correct Answer: Option (a) 1 only

Explanation:

Asiatic Lion ✅

• Naturally found only in India, mainly in Gir National Park.

Double-humped Camel ❌

• Native to Central Asia (Mongolia, China); also found in Ladakh but not exclusive to India.

One-horned Rhinoceros ❌

• Found in India and Nepal (e.g., Assam and Terai region), so not limited to India.

Core Insight: Only Asiatic lion is exclusive to India; camel and rhino have wider natural distribution.

Correct Answer: Option (c)

Explanation:

Plastic = synthetic polymer derived from petrochemicals; exists in many non-obvious everyday products

→ The question tests awareness of hidden plastics beyond obvious items like bags and bottles

• (I) ✅ — Cigarette filters contain cellulose acetate, a plastic polymer; non-biodegradable, releases microplastics into soil and water when discarded
• (II) ✅ — Modern eyeglass lenses are made of polycarbonate or CR-39 (allyl diglycol carbonate); both are plastic polymers chosen for being lightweight and impact-resistant
• (III) ✅ — Car tyres contain synthetic rubber (styrene-butadiene, butadiene rubber) derived from petrochemicals; these are plastic-based polymers reinforced with carbon black

Core Insight: Plastic is not just bags and bottles — cigarette filters (cellulose acetate), eyeglass lenses (polycarbonate), and tyres (synthetic rubber) are all polymer-based; critical for understanding microplastic pollution sources.

Correct Answer: Option (a)

Explanation:

Agasthyamala Biosphere Reserve is located in the Western Ghats (Kerala–Tamil Nadu region).

It includes:

• → Neyyar, Peppara, Shendurney Wildlife Sanctuaries
• → Kalakad Mundanthurai Tiger Reserve
• It is a biodiversity hotspot with rich flora and fauna and a key genetic reservoir of plants.

Core Insight: Agasthyamala BR comprises Neyyar–Peppara–Shendurney WLS and Kalakad Mundanthurai TR in the southern Western Ghats.

Correct Answer: Option (a)

Explanation:

Key concept = Foreign Direct Investment (FDI)
→ Investment involving ownership/control (≥10% equity)

(d) ❌ — NRE deposits not FDI

Core Insight: Only equity-linked instruments count as FDI, not deposits

Correct Answer: Option (c)

Explanation:

Majorana 1 = Microsoft’s topological quantum processor using Majorana zero modes for stable qubits

→ The trap here is Microsoft vs AWS — two giants both active in quantum space, easy to confuse

• (I) ✅ — Majorana 1 unveiled by Microsoft in February 2025; uses topological qubits resistant to decoherence; designed to scale up to 1 million qubits; major leap toward fault-tolerant quantum computing
• (II) ❌ — Majorana 1 is a Microsoft product, not AWS; AWS developed a separate quantum chip called Ocelot focused on error correction — two independent projects
• (III) ✅ — Standard AI taxonomy: AI → Machine Learning → Deep Learning; deep learning uses multi-layered neural networks; powers image recognition, speech recognition, and generative AI

Core Insight: Majorana 1 = Microsoft, Ocelot = AWS — remember this pair. Also lock in the AI hierarchy: Deep Learning ⊂ Machine Learning ⊂ AI — this appears repeatedly in UPSC.

Correct Answer: Option (c) Oyster

Key concept = Filter feeder
→ Organisms that obtain food by filtering suspended particles (plankton, organic matter) from water

• Oyster feeds by passing water over its gills, trapping tiny food particles → classic filter-feeding mechanism
• Catfish → bottom feeder/scavenger
• Octopus → active predator
• Pelican → fish-eating bird (not filter feeder)

Core Insight: Only oysters use true filter feeding; others rely on active hunting or scavenging.

Correct Answer: Option (b)

Explanation:

CL-20, HMX, LLM-105 = high-energy chemical compounds developed primarily for defence applications

→ All three share the property of high detonation velocity + stability, making them superior military explosives

• (a) ❌ — HFCs are refrigerants; these compounds have zero connection to cooling technology
• (b) ✅ — All three are military-grade explosives used in missiles, warheads, and high-energy formulations; more powerful and stable than TNT and RDX
• (c) ❌ — Cruise missile fuels are hydrocarbon-based (like kerosene); these are explosives, not propulsion fuels
• (d) ❌ — Rocket propulsion uses liquid/solid fuels like UDMH or HTPB; HMX is sometimes a component in propellants but the primary identity of all three is as explosives

Core Insight: CL-20, HMX, and LLM-105 are all next-generation military explosives — more powerful and stable than RDX/TNT; CL-20 is currently the most powerful non-nuclear explosive known.

Correct Answer: Option (b) 2 and 3 only

Key concept = Copper smelting pollution
→ Process releases toxic gases and hazardous waste (slag) impacting air and water quality

• Heavy metal leaching: Copper slag can release metals like arsenic, lead, and cadmium into soil and groundwater
• Sulphur dioxide (SO₂): Released during smelting of sulphide ores; causes air pollution and acid rain
• Carbon monoxide: Mainly an intermediate in the process, not a major environmental concern

Core Insight: Key risks = SO₂ emissions and heavy metal contamination from slag.

Correct Answer: Option (d)

Explanation:

Monoclonal Antibodies (mAbs) = laboratory-made proteins cloned from a single B-cell, producing identical antibodies targeting one specific antigen

→ “Mono” = one clone, one target — this specificity is their defining strength

• (I) ✅ — mAbs are entirely man-made proteins engineered in labs using biotechnology; modelled on the body’s natural immune proteins but do not occur naturally
• (II) ✅ — mAbs bind to specific antigens on pathogens or abnormal cells; this binding neutralises the pathogen, marks it for immune destruction, or blocks viral entry receptors — actively enhancing immune response
• (III) ✅ — mAbs are used across multiple viral infections: m102.4 for Nipah virus (compassionate use protocols); Casirivimab + Imdevimab for COVID-19; Inmazeb/Ebanga for Ebola

Core Insight: Monoclonal antibodies = man-made + antigen-specific + therapeutically versatile; remember m102.4 → Nipah, Casirivimab → COVID-19; mAbs are now a standard UPSC Science & Tech topic — all three properties are correct.

Correct Answer: Option (a) 1 only

Key concept = Early English East India Company expansion
→ Initial factories were set up on the western coast (Gujarat) due to active maritime trade

• Broach (Bharuch): Major port in Gujarat; EIC established a factory here in the early 17th century
• Chicacole (Andhra region): Not part of early EIC network; east coast expansion happened later (Madras phase)
• Trichinopoly (Tamil region): Inland centre; no early EIC factory here

Core Insight: EIC’s early trade was Gujarat-based; expansion to east and south came later.

Correct Answer: Option (d)

Explanation:

Key Pattern = all three statements use “No virus” — an absolute qualifier

→ In biology, absolutes almost always fail; one exception is enough to invalidate the entire statement

• (I) ❌ — Oceans contain an estimated 10³⁰ viruses — among the most virus-rich environments on Earth; cyanophages infect marine phytoplankton (Prochlorococcus, Synechococcus) and play critical roles in carbon and nutrient cycling
• (II) ❌ — Bacteriophages specifically infect bacteria; most abundant biological entities on Earth; found in soil, water, and human gut; T4 phage infects E. coli; now being explored in phage therapy against drug-resistant bacteria
• (III) ❌ — Viruses actively hijack host transcriptional machinery; HIV Tat protein enhances viral RNA transcription; Herpes simplex virus suppresses host transcription to prioritise viral genes; viruses can activate/repress host genes entirely

Core Insight: In UPSC biology questions, “No,” “All,” “Always,” “Never” are red flag words — train yourself to instantly hunt for one exception; here all three fall to the same trap of absolute language.

Correct Answer: Option (b) 2 only

Key concept = Mitakshara vs Dayabhaga
→ Two schools of Hindu inheritance law, differing mainly in timing of rights over property

• Statement 1 ❌
  Not based on caste; it is a regional distinction (Mitakshara—most of India, Dayabhaga—Bengal).
• Statement 2 ✅
  Mitakshara → sons get right by birth
  Dayabhaga → sons get right after father’s death
• Statement 3 ❌
  Both systems traditionally focused on male inheritance, not male vs female division.

Core Insight: Mitakshara = birthright; Dayabhaga = inheritance after death.

Correct Answer: Option (b)

Explanation:

Cement CO₂ emissions = approximately 6.5–8% of global CO₂; well above the 5% threshold mentioned in Statement I

→ The real question is not what is correct, but which statement explains the emissions

• Statement I ✅ — Cement industry produces ~1.6 billion metric tonnes of CO₂ annually; one of the largest industrial emission sources globally
• Statement II ✅ — Silica-bearing clay/shale is indeed mixed with limestone to form clinker; silica reacts with calcium compounds to form calcium silicates giving cement its binding strength — factually correct but does NOT explain CO₂ emissions
• Statement III ✅ — During calcination, limestone (CaCO₃) is heated to ~1450°C and decomposes into lime (CaO) + CO₂; reaction: CaCO₃ → CaO + CO₂ — this is the primary source of cement industry emissions; directly explains Statement I

Core Insight: In cement manufacturing, calcination = CO₂ source; mixing clay with limestone is just a preparatory step — always distinguish between a step that describes the process vs one that explains the emission outcome; this is a classic UPSC explanatory reasoning trap.