Daily UPSC Prelims Quiz (October 17, 2026): 5 High-Yield MCQs & Explanations

Daily UPSC Prelims Quiz: 5 High-Yield Questions with Detailed Explanations (October 17, 2026)

Test your knowledge with today's UPSC Prelims practice questions derived from today's top newspaper editorials. Attempt each question before reading the explanation and trap alerts.

Question 1: India's Role in BRICS, West Asia & Constitutional Treaty-Making Powers

Context / Statement: Consider the following statements regarding India's foreign policy engagements in West Asia and constitutional provisions related to international treaties:

The recent expansion of BRICS to include key West Asian nations has altered regional geopolitical dynamics, increasing India's strategic imperative to balance multilateral platforms with minilateral frameworks like the India-Middle East-Europe Economic Corridor (IMEC).
Under Article 73 of the Indian Constitution, the executive power of the Union extends to the implementation of any international treaty or agreement without exception, even if the subject matter falls exclusively within the State List, bypassing Parliament entirely.
India's diplomatic outreach in West Asia seeks to secure energy security, protect the Indian diaspora, and counter maritime security vulnerabilities in the Western Indian Ocean.

Which of the statements given above is/are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

👉 Click to Reveal Answer & Detailed Explanation

Correct Answer: (c)

Detailed Explanation: Statement 1 is correct. The expansion of BRICS incorporates vital West Asian energy powers, augmenting minilateral initiatives like IMEC. Statement 2 is incorrect. While Article 73 extends executive power to matters with respect to which Parliament has power to make laws, Article 253 explicitly empowers *Parliament* to enact laws for implementing any treaty, agreement, or convention with any country. The executive cannot unilaterally override legislative competence on State List subjects without statutory backing or constitutional enablement where domestic law changes are required. Statement 3 is correct; West Asia remains critical for India's energy security, diaspora remittances, and maritime stability.

⚠️ UPSC Prelims Trap Alert: Watch out for absolute terms like "without exception" and "bypassing Parliament entirely" in Statement 2. Treaty-making is an executive prerogative, but implementation affecting domestic municipal law or State List subjects requires legislative competence.

Syllabus Match: GS Paper 2 - Bilateral, regional and global groupings involving India and/or affecting India's interests; Indian Constitution—Salient features.

Question 2: Space Governance, On-Orbit Weapons & Satellite Orbits

Context / Statement: Consider the following statements regarding space governance, space control weapons, and orbital mechanics:

The Outer Space Treaty (OST) of 1967 explicitly prohibits the placement of nuclear weapons or weapons of mass destruction in Earth's orbit, but contains legal ambiguities and regulatory gaps concerning conventional 'on-orbit space control weapons' (such as co-orbital anti-satellite systems).
Low Earth Orbit (LEO) is utilized strictly and exclusively for deep space exploration and interplanetary probes, never for Earth observation or commercial broadband constellations.
Geostationary Earth Orbit (GEO) satellites revolve around the Earth at a speed matching the Earth's rotation, rendering them stationary relative to a fixed point on the Earth's surface, making them ideal for continuous telecommunications.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

👉 Click to Reveal Answer & Detailed Explanation

Correct Answer: (c)

Detailed Explanation: Statement 1 is correct. The OST (1967) bans WMDs in orbit, but conventional weapons, cyber-attacks on space assets, and kinetic/co-orbital interceptors remain inadequately governed, sparking debates on multilateral space arms control. Statement 2 is incorrect. Low Earth Orbit (LEO, generally up to 2,000 km) is precisely where Earth observation, military reconnaissance, and mega-constellations like Starlink operate—not deep space probes, which require high-energy escape trajectories. Statement 3 is correct; GEO sits at approximately 35,786 km and matches Earth’s angular velocity, providing fixed-footprint coverage.

⚠️ UPSC Prelims Trap Alert: UPSC frequently tests definitions of orbital regimes. Attributing LEO exclusively to deep space exploration is a factual distortion designed to trap aspirants who confuse LEO with interplanetary missions.

Syllabus Match: GS Paper 3 - Awareness in the fields of Space and Technology.

Question 3: Quantum Computing Principles & Health Impacts of Air Pollution

Context / Statement: Consider the following statements regarding emerging technologies and environmental health hazards:

Quantum computing leverages the fundamental principles of quantum mechanics—namely superposition and entanglement—to perform complex computations simultaneously, unlike classical computers that process bits sequentially.
Fine particulate matter (PM2.5) consists of microscopic particles with a diameter of 2.5 micrometers or less, capable of bypassing the body's natural upper respiratory filters, penetrating deep into pulmonary alveoli, and translocating into the systemic bloodstream.
Quantum supremacy ensures that present-day quantum processors can instantly break all forms of classical cryptographic encryption without the requirement of error-correction codes.

Which of the statements given above is/are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

👉 Click to Reveal Answer & Detailed Explanation

Correct Answer: (a)

Detailed Explanation: Statement 1 is correct. Qubits utilize superposition (existing in multiple states simultaneously) and entanglement (correlated states) to achieve massive parallelism. Statement 2 is correct. PM2.5 particles are small enough to cross the alveolar-capillary membrane, entering the circulatory system and causing systemic inflammation, cardiovascular pathologies, and neurological disorders. Statement 3 is incorrect. Quantum supremacy merely demonstrates that a quantum device can solve a specific mathematical problem faster than the world's most powerful supercomputer; it does *not* imply breaking all classical crypto instantly, nor does it eliminate the critical need for quantum error correction (given qubits are notoriously sensitive to decoherence).

⚠️ UPSC Prelims Trap Alert: Beware of absolute and futuristic exaggerations like "instantly break all forms... without error-correction codes". Quantum error correction remains one of the greatest engineering bottlenecks in quantum computing.

Syllabus Match: GS Paper 3 - IT, Computers, Space, Nano-tech, Bio-tech; Conservation, environmental pollution and degradation.

Question 4: Excess Liquidity in the Banking System & Monetary Policy Instruments

Context / Statement: Consider the following statements regarding liquidity management by the Reserve Bank of India (RBI):

Prolonged excess liquidity in the domestic banking system typically exerts downward pressure on short-term money market interest rates, such as the Weighted Average Call Rate (WACR), occasionally driving them below the RBI's policy repo rate.
The Standing Deposit Facility (SDF) introduced by the RBI requires commercial banks to provide government securities as collateral when parking excess overnight liquidity with the central bank.
Open Market Operations (OMOs) involving the outright sale of government securities by the RBI act as a liquidity-absorbing measure, draining surplus cash from the financial system.

Which of the statements given above is/are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

👉 Click to Reveal Answer & Detailed Explanation

Correct Answer: (c)

Detailed Explanation: Statement 1 is correct. When banks are flush with surplus funds and credit demand is sluggish, competition to lend in the interbank call money market pushes short-term rates below the repo rate. Statement 2 is incorrect. A defining feature of the Standing Deposit Facility (SDF) is that it is an **uncollateralized** liquidity absorption tool—banks park funds with the RBI without needing to pledge G-secs, unlike the erstwhile fixed-rate reverse repo. Statement 3 is correct. Selling G-secs via OMOs absorbs liquidity from the market, contracting money supply.

⚠️ UPSC Prelims Trap Alert: The collateral requirement distinction between the Marginal Standing Facility (MSF - collateralized by SLR securities) and the Standing Deposit Facility (SDF - uncollateralized) is a favourite testing ground for RBI monetary policy instruments.

Syllabus Match: GS Paper 3 - Indian Economy and issues relating to planning, mobilization of resources, growth and development.

Question 5: Rapid Urbanisation & Global Patterns of Migration

Context / Statement: Consider the following statements regarding rapid urbanisation and global migration dynamics:

According to Everett Lee’s push-pull theory of migration, rural-to-urban migration is driven by 'push' factors in origin areas (such as agrarian distress and environmental degradation) and 'pull' factors in destination cities (such as employment opportunities and better healthcare).
Sustainable Development Goal 11 (SDG 11) specifically focuses on making cities and human settlements inclusive, safe, resilient, and sustainable.
Urbanisation in developing nations uniformly prevents the emergence of primate cities and informal slum settlements due to decentralized municipal planning.

Which of the statements given above is/are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

👉 Click to Reveal Answer & Detailed Explanation

Correct Answer: (a)

Detailed Explanation: Statement 1 is correct. Lee's migration model highlights interacting push and pull factors alongside intervening obstacles. Statement 2 is correct. SDG 11 explicitly targets sustainable cities and communities. Statement 3 is incorrect. Developing nations typically experience *unbalanced* urban growth, characterized by "primate city syndrome" (where one major city vastly outstrips all others in size and economic power) and explosive growth of informal settlements and urban slums due to infrastructure deficits.

⚠️ UPSC Prelims Trap Alert: Watch out for idealistic generalizations like "uniformly prevents... informal slum settlements". Real-world urbanization in the Global South is heavily marked by informal sprawl and severe infrastructural deficits.

Syllabus Match: GS Paper 1 - Population and associated issues, poverty and developmental issues, urbanisation, their problems and remedies.

Prelims Revision Flashcards

Article 253: Empowers Parliament to make legislation for implementing international treaties, overriding normal federal division of powers if necessary.
Outer Space Treaty (1967): Bans WMDs in orbit, but leaves conventional space control weapons and cyber vulnerabilities in a regulatory gray area.
Quantum Qubits: Depend on superposition and entanglement; suffer heavily from decoherence, making error-correction indispensable.
Standing Deposit Facility (SDF): RBI's uncollateralized tool to absorb excess liquidity from banks at an interest rate below the repo rate.
SDG 11: Dedicated global blueprint for sustainable, inclusive, safe, and resilient cities and human settlements.

Conclusion

Rigorous conceptual clarity combined with current affairs integration is the bedrock of clearing the UPSC Civil Services Prelims exam. Encourage aspirants to post their score (out of 5) in the comments below!

🏛️ Official Government & Policy Updates (PIB Gazette Connect)

Key national initiatives, Cabinet & Ministry releases aligned with GS-2 and GS-3:

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