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PSC Chronicles Team

Indus Waters Treaty: India Rejects Court of Arbitration Ruling – 8 Prelims Facts

The Indus Waters Treaty is in focus after India rejected the Hague-based Court of Arbitration’s finding that keeping the treaty in abeyance is impermissible. This note explains the Indus Waters Treaty dispute and the static facts needed for prelims.

Indus Waters Treaty

Why in News?

The Court of Arbitration concluded that India’s decision to hold the Indus Waters Treaty (IWT) in ‘abeyance’ was not permissible under the Treaty or international law.

India rejected the award, stating the court is ‘illegally constituted’ and has ‘no jurisdiction whatsoever’ to pronounce on India’s sovereign decisions; India placed the treaty in abeyance after the Pahalgam terror attack (April 2025).

Indus Waters Treaty: Key Facts for Prelims

  • Signed 19 September 1960 in Karachi by Jawaharlal Nehru and Ayub Khan; brokered by the World Bank (a signatory for limited purposes).
  • Eastern rivers – Sutlej, Beas, Ravi: exclusive use by India (~20% of basin water, ~33 MAF).
  • Western rivers – Indus, Jhelum, Chenab: allocated to Pakistan (~80%, ~135 MAF); India may use them for non-consumptive uses, limited irrigation and run-of-the-river hydropower.
  • Institutional mechanism: Permanent Indus Commission (one commissioner each), meeting at least once a year.
  • Three-tier dispute resolution: Permanent Indus Commission β†’ Neutral Expert (technical ‘differences’) β†’ Court of Arbitration (‘disputes’). India favours the Neutral Expert route; Pakistan pushed for a Court of Arbitration on Kishenganga and Ratle projects.
  • Treaty has no unilateral exit clause (Article XII) – it can be modified only by a ratified treaty between the two governments.

Permanent Court of Arbitration – static points

  • The ‘Hague Court of Arbitration’ refers to the Permanent Court of Arbitration (PCA), established by the 1899 Hague Convention, located at the Peace Palace, The Hague.
  • Resolves disputes between states, state entities, international organisations and private parties; not to be confused with the International Court of Justice (UN’s principal judicial organ, also in the Peace Palace).
  • Earlier IWT cases: Baglihar (Neutral Expert, 2007) and Kishenganga (Court of Arbitration, 2013).

Indian projects on the western rivers

  • Kishenganga (Jhelum tributary), Ratle, Baglihar, Salal, Dulhasti, Pakal Dul, Kiru, Kwar (all on the Chenab system), Tulbul navigation project (Wular Lake).

Quick Revision Table: Indus Waters Treaty

PointDetail
Treaty signed1960, Karachi; World Bank broker
Eastern rivers (India)Sutlej, Beas, Ravi
Western rivers (Pakistan)Indus, Jhelum, Chenab
Water split~20% India, ~80% Pakistan
CommissionPermanent Indus Commission
Court locationPCA, Peace Palace, The Hague
India’s standTreaty in abeyance; court lacks jurisdiction

Trap / Confusing Points: Indus Waters Treaty

ConfusionCorrect Position
The World Bank is a full party to the IWTIt is a signatory only for specified procedural purposes
Chenab is an eastern riverNo – western river allotted to Pakistan
PCA and ICJ are the sameBoth are in the Peace Palace but are separate institutions
India can build storage dams freely on western riversOnly limited storage; hydropower must be run-of-the-river

5 Practice MCQs on Indus Waters Treaty

1. Which of the following are ‘eastern rivers’ under the Indus Waters Treaty?
a. Indus, Jhelum, Chenab
b. Sutlej, Beas, Ravi
c. Ravi, Chenab, Jhelum
d. Sutlej, Indus, Beas
Ans: B
Explanation: India has exclusive rights over Sutlej, Beas and Ravi.

2. The Indus Waters Treaty was brokered by:
a. United Nations
b. World Bank
c. International Court of Justice
d. Commonwealth
Ans: B
Explanation: The World Bank mediated the treaty signed in 1960.

3. The Permanent Court of Arbitration was established under:
a. UN Charter 1945
b. Hague Convention 1899
c. Geneva Convention 1949
d. Treaty of Versailles 1919
Ans: B
Explanation: The PCA was created by the 1899 Hague Convention for the Pacific Settlement of International Disputes.

4. The Kishenganga hydroelectric project is built on a tributary of which river?
a. Chenab
b. Ravi
c. Jhelum
d. Indus
Ans: C
Explanation: Kishenganga (Neelum) is a tributary of the Jhelum.

5. Under the IWT, the first forum for resolving questions between the two countries is:
a. Court of Arbitration
b. Neutral Expert
c. Permanent Indus Commission
d. International Court of Justice
Ans: C
Explanation: The Permanent Indus Commission is the first tier; Neutral Expert and Court of Arbitration follow.

Exam tip: Revise Indus Waters Treaty together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about India’s rejection of the IWT ruling, Click here.

Indus Waters Treaty: India Rejects Court of Arbitration Ruling – 8 Prelims Facts Read More Β»

SCO Summit 2026 Bishkek: 25 Years of SCO – 8 Facts for UPSC Prelims

The SCO Summit 2026 – the 26th meeting of the Council of Heads of State of the Shanghai Cooperation Organisation – was held in Bishkek, Kyrgyzstan, marking 25 years of the grouping. This note gives the SCO Summit 2026 facts and SCO structure for prelims.

SCO Summit 2026

Why in News?

Kyrgyzstan hosted the 26th SCO Heads of State Council meeting in Bishkek under the theme ’25 Years of the SCO: Together Towards Sustainable Peace, Development and Prosperity’.

The summit marked the 25th anniversary of the SCO, founded in 2001 in Shanghai.

SCO Summit 2026: Key Facts for Prelims

  • SCO: permanent Eurasian intergovernmental political, economic and security organisation established on 15 June 2001; grew out of the ‘Shanghai Five’ (1996: China, Russia, Kazakhstan, Kyrgyzstan, Tajikistan) with Uzbekistan joining in 2001.
  • 10 member states: six founders + India and Pakistan (2017), Iran (2023), Belarus (2024).
  • Secretariat: Beijing; RATS (Regional Anti-Terrorist Structure): Tashkent.
  • Official languages: Russian and Chinese. Presidency rotates annually; the previous summit (2025) was in Tianjin, China.
  • India hosted the SCO summit in 2023 (virtual, New Delhi) and proposed the ‘SECURE’ concept; Varanasi was the first SCO Tourism and Cultural Capital (2022–23).

Interconnected concept: RATS

  • Regional Anti-Terrorist Structure is a permanent organ of the SCO based in Tashkent, Uzbekistan, coordinating action against the ‘three evils’ – terrorism, separatism and extremism.
  • SCO’s two permanent bodies: Secretariat (Beijing) and RATS (Tashkent).
  • Counter-terror exercise of SCO: ‘Peace Mission’.

SCO and India – exam angles

  • India joined as observer in 2005 and full member in 2017 (Astana summit).
  • SCO accounts for roughly 40% of world population and about a quarter of global GDP.
  • India engages SCO for Central Asian connectivity (Chabahar, INSTC) but has not endorsed China’s BRI in SCO declarations.

Quick Revision Table: SCO Summit 2026

PointDetail
Summit26th Heads of State Council
VenueBishkek, Kyrgyzstan
Theme25 Years of the SCO: Together Towards Sustainable Peace, Development and Prosperity
Founded2001, Shanghai
Members10 (India & Pakistan 2017, Iran 2023, Belarus 2024)
SecretariatBeijing
RATSTashkent

Trap / Confusing Points: SCO Summit 2026

ConfusionCorrect Position
SCO secretariat is in ShanghaiNo – Beijing; SCO was founded in Shanghai
RATS is in BeijingNo – Tashkent, Uzbekistan
India is a founding memberNo – joined 2017; observer since 2005
Belarus joined with Iran in 2023Iran 2023; Belarus 2024

5 Practice MCQs on SCO Summit 2026

1. The 26th SCO Heads of State summit was held in:
a. Astana
b. Tianjin
c. Bishkek
d. Samarkand
Ans: C
Explanation: Kyrgyzstan hosted the 2026 summit in Bishkek.

2. Which country became the 10th member of the SCO in 2024?
a. Iran
b. Mongolia
c. Belarus
d. Afghanistan
Ans: C
Explanation: Belarus joined in 2024 after Iran in 2023.

3. The Regional Anti-Terrorist Structure (RATS) of the SCO is headquartered at:
a. Beijing
b. Moscow
c. Tashkent
d. Bishkek
Ans: C
Explanation: RATS is based in Tashkent, Uzbekistan.

4. India and Pakistan became full members of the SCO in:
a. 2005
b. 2015
c. 2017
d. 2019
Ans: C
Explanation: Both were admitted at the 2017 Astana summit.

5. Which of the following is NOT a member of the SCO?
a. Uzbekistan
b. Iran
c. Turkey
d. Tajikistan
Ans: C
Explanation: Turkey is a dialogue partner, not a member.

Exam tip: Revise SCO Summit 2026 together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the SCO Bishkek summit, Click here.

SCO Summit 2026 Bishkek: 25 Years of SCO – 8 Facts for UPSC Prelims Read More Β»

Lake America: Google Maps Renames Lake Ontario for US Users – Great Lakes Facts

Lake America is the new name shown on Google Maps for Lake Ontario to users in the United States, following an executive order by President Donald Trump. This note explains the Lake America rename and the Great Lakes geography that prelims papers love.

Lake America

Why in News?

Google renamed Lake Ontario as Lake America on Maps for US users after a presidential executive order; users in Canada and the rest of the world still see Lake Ontario.

The symbolic rename stems from the escalating US–Canada trade war triggered by collapsed tariff negotiations, echoing the earlier ‘Gulf of America’ renaming of the Gulf of Mexico.

Lake America: Key Facts for Prelims

  • Lake Ontario is the smallest by surface area and the easternmost of the five Great Lakes; it forms a natural boundary between Ontario (Canada) and New York (USA).
  • It receives water from Lake Erie via the Niagara River (Niagara Falls) and drains into the Atlantic through the St. Lawrence River.
  • Toronto, Canada’s largest city, lies on its north-western shore.
  • Google follows official government naming databases (US Board on Geographic Names) for each country’s users – the same logic applied to ‘Gulf of America’.

The Great Lakes – interconnected concept

  • Five lakes (west to east): Superior, Michigan, Huron, Erie, Ontario – mnemonic ‘HOMES’ or ‘Super Man Helps Every One’.
  • Lake Superior: largest freshwater lake in the world by surface area; deepest of the five.
  • Lake Michigan: the only Great Lake entirely within the USA.
  • Together they hold about 21% of the world’s surface fresh water; connected to the Atlantic by the St. Lawrence Seaway.
  • Niagara Falls lies between Lake Erie and Lake Ontario; Detroit lies between Huron (via St. Clair) and Erie.

US–Canada friction points

  • Tariff disputes over steel, aluminium, dairy and autos under the USMCA (successor of NAFTA, in force 2020).
  • Canada is the USA’s largest export market; Ontario’s Great Lakes shipping and hydro-power ties cross the border.

Quick Revision Table: Lake America

PointDetail
New name (US users)Lake America
Original nameLake Ontario
TriggerUS presidential executive order
BorderOntario (Canada) – New York (USA)
Inflow / outflowNiagara River / St. Lawrence River
Largest Great LakeSuperior (largest freshwater lake by area)
Only Great Lake wholly in USAMichigan

Trap / Confusing Points: Lake America

ConfusionCorrect Position
Lake Ontario is the largest Great LakeNo – it is the smallest by area; Superior is largest
Lake Baikal is the largest freshwater lake by areaBaikal is largest by volume and depth; Superior is largest by surface area
The rename applies worldwideNo – only for Google Maps users in the USA
Lake Michigan is shared with CanadaNo – it lies entirely in the USA

5 Practice MCQs on Lake America

1. Which of the following Great Lakes lies entirely within the United States?
a. Lake Superior
b. Lake Huron
c. Lake Michigan
d. Lake Erie
Ans: C
Explanation: Lake Michigan is the only Great Lake wholly in the USA.

2. Lake Ontario drains into the Atlantic Ocean through the:
a. Hudson River
b. St. Lawrence River
c. Mississippi River
d. Niagara River
Ans: B
Explanation: The St. Lawrence River carries Great Lakes water to the Atlantic.

3. Niagara Falls is located between which two Great Lakes?
a. Superior and Huron
b. Huron and Erie
c. Erie and Ontario
d. Michigan and Huron
Ans: C
Explanation: The Niagara River drops from Lake Erie to Lake Ontario.

4. The largest freshwater lake in the world by surface area is:
a. Lake Baikal
b. Lake Victoria
c. Lake Superior
d. Lake Tanganyika
Ans: C
Explanation: Superior is largest by area; Baikal is largest by volume; Victoria is largest in Africa.

5. Which trade agreement currently governs US–Canada–Mexico trade?
a. NAFTA
b. USMCA
c. CPTPP
d. TTIP
Ans: B
Explanation: USMCA replaced NAFTA in 2020.

Exam tip: Revise Lake America together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the Lake America rename, Click here.

Lake America: Google Maps Renames Lake Ontario for US Users – Great Lakes Facts Read More Β»

Manipur NRC Demand: Assembly Resolution with 1961 Base Year – UPSC Notes

The Manipur NRC demand has resurfaced with the state Assembly passing its third resolution asking the Centre to implement and update the National Register of Citizens in Manipur with 1961 as the base year. This note explains the Manipur NRC issue and the NRC–NPR distinction for prelims.

Manipur NRC

Why in News?

The Manipur Assembly adopted a resolution urging the Centre to implement the NRC with 1961 as the base year and to prioritise it before the national Census.

1961 is the cut-off year Manipur already uses to identify native residents under its Inner Line Permit (ILP) regime.

Manipur NRC: Key Facts for Prelims

  • NRC = official register of legal Indian citizens, meant to identify and remove illegal immigrants.
  • First nationwide NRC was prepared after the 1951 Census; it was never updated at the national level.
  • Assam is the only state that updated its NRC – final list published in 2019 under Supreme Court supervision, using 24 March 1971 as the cut-off (Assam Accord, 1985).
  • Legal basis: Section 14A of the Citizenship Act, 1955 (inserted 2004) and the Citizenship (Registration of Citizens and Issue of National Identity Cards) Rules, 2003.
  • Manipur got the Inner Line Permit system in December 2019 under the Bengal Eastern Frontier Regulation, 1873 (like Arunachal, Nagaland, Mizoram).

NPR vs NRC (interconnected concept)

  • NPR (National Population Register) records every usual resident who has lived in an area for six months or more or intends to – including foreign nationals.
  • NRC records only Indian citizens.
  • NPR is prepared under the 2003 Rules through the house-listing phase of the Census; it is the first step envisaged towards a national NRC.
  • Census is conducted under the Census Act, 1948; the Registrar General and Census Commissioner (MHA) handles both Census and NPR.

Quick Revision Table: Manipur NRC

PointDetail
DemandUpdate NRC in Manipur, base year 1961
Resolution countThird such Assembly resolution
Sequence soughtNRC before Census
Only state with updated NRCAssam (2019, cut-off 24 March 1971)
Legal basisSection 14A, Citizenship Act 1955 + 2003 Rules
NPR coversAll usual residents incl. foreigners
NRC coversOnly Indian citizens

Trap / Confusing Points: Manipur NRC

ConfusionCorrect Position
NRC has been prepared for all of India recentlyNo – only 1951 nationwide; Assam updated in 2019
Assam’s NRC cut-off is 1961No – 24 March 1971; 1961 is Manipur’s ILP base year
NPR and NRC are the sameNPR lists usual residents; NRC lists citizens
Manipur has no Inner Line PermitILP extended to Manipur in December 2019

5 Practice MCQs on Manipur NRC

1. The first National Register of Citizens in India was prepared after which Census?
a. 1941
b. 1951
c. 1961
d. 1971
Ans: B
Explanation: The 1951 NRC was the only nationwide register ever prepared.

2. Which state has updated its NRC under Supreme Court supervision?
a. Manipur
b. Tripura
c. Assam
d. Nagaland
Ans: C
Explanation: Assam’s final NRC was published in August 2019.

3. The cut-off date for citizenship under the Assam Accord is:
a. 15 August 1947
b. 1 January 1966
c. 24 March 1971
d. 25 March 1971
Ans: C
Explanation: Persons entering Assam after 24 March 1971 are treated as illegal migrants.

4. The National Population Register includes:
a. Only Indian citizens
b. Only voters
c. All usual residents including foreigners
d. Only persons with Aadhaar
Ans: C
Explanation: NPR records usual residents irrespective of citizenship.

5. The Inner Line Permit system draws its authority from:
a. Citizenship Act, 1955
b. Bengal Eastern Frontier Regulation, 1873
c. Foreigners Act, 1946
d. Sixth Schedule of the Constitution
Ans: B
Explanation: ILP is issued under the Bengal Eastern Frontier Regulation, 1873.

Exam tip: Revise Manipur NRC together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the Manipur NRC resolution, Click here.

Manipur NRC Demand: Assembly Resolution with 1961 Base Year – UPSC Notes Read More Β»

PM Jan Dhan Yojana Completes 12 Years: 6 Key Facts for UPSC Prelims

PM Jan Dhan Yojana (PMJDY), launched on 28 August 2014, has completed 12 years of transforming financial inclusion in India. This note lists the PM Jan Dhan Yojana features and linked schemes that prelims papers repeatedly test.

PM Jan Dhan Yojana

Why in News?

PMJDY marked 12 years with over 59 crore accounts and deposits above Rs 3 lakh crore; roughly two-thirds of accounts are in rural/semi-urban areas and more than half belong to women.

PM Jan Dhan Yojana: Key Facts for Prelims

  • National Mission for Financial Inclusion under the Department of Financial Services, Ministry of Finance.
  • Zero-balance Basic Savings Bank Deposit (BSBD) account – no minimum balance requirement.
  • Free RuPay debit card with accident insurance cover of Rs 2 lakh (Rs 1 lakh for accounts opened before 28 August 2018).
  • Overdraft facility up to Rs 10,000 (raised from Rs 5,000 in 2018); age limit for OD raised to 18–65 years.
  • Phase 2 (from 2018) shifted focus from ‘every household’ to ‘every unbanked adult’.
  • Backbone of the JAM trinity (Jan Dhan–Aadhaar–Mobile) enabling Direct Benefit Transfer.

Linked social security schemes (launched 2015)

  • PM Jeevan Jyoti Bima Yojana – life cover Rs 2 lakh, premium Rs 436/year, age 18–50.
  • PM Suraksha Bima Yojana – accident cover Rs 2 lakh, premium Rs 20/year, age 18–70.
  • Atal Pension Yojana – guaranteed pension Rs 1,000–5,000 per month after 60, for 18–40 age group (regulated by PFRDA).
  • Earlier financial-inclusion steps: Lead Bank Scheme (1969), RRBs (1975), Swabhimaan (2011), Business Correspondent model (2006), RBI’s BSBD account (2012).

Quick Revision Table: PM Jan Dhan Yojana

PointDetail
Launch28 August 2014
NodalDepartment of Financial Services, MoF
Account typeZero-balance BSBD account
CardRuPay debit card
Accident coverRs 2 lakh (Rs 1 lakh pre-2018 accounts)
OverdraftUp to Rs 10,000
Linked trinityJAM – Jan Dhan, Aadhaar, Mobile

Trap / Confusing Points: PM Jan Dhan Yojana

ConfusionCorrect Position
PMJDY gives a life insurance coverNo – accident cover via RuPay card; life cover is PMJJBY
Overdraft limit is Rs 5,000Raised to Rs 10,000 in 2018
PMJDY accounts require Aadhaar mandatorilyNo – any officially valid document; Aadhaar seeding is encouraged for DBT
PMJDY is run by RBINo – Ministry of Finance (DFS); RBI is the regulator

5 Practice MCQs on PM Jan Dhan Yojana

1. PM Jan Dhan Yojana was launched on:
a. 15 August 2014
b. 28 August 2014
c. 2 October 2014
d. 1 January 2015
Ans: B
Explanation: Announced on 15 August 2014 and launched on 28 August 2014.

2. The accident insurance cover linked to the RuPay card under PMJDY for accounts opened after 28 August 2018 is:
a. Rs 30,000
b. Rs 1 lakh
c. Rs 2 lakh
d. Rs 5 lakh
Ans: C
Explanation: Cover was doubled from Rs 1 lakh to Rs 2 lakh for new accounts in 2018.

3. Which of the following schemes provides a guaranteed pension and is regulated by PFRDA?
a. PMJJBY
b. PMSBY
c. Atal Pension Yojana
d. PM-SYM
Ans: C
Explanation: Atal Pension Yojana (2015) guarantees Rs 1,000–5,000 monthly pension after age 60.

4. The ‘JAM trinity’ refers to:
a. Jan Dhan, Aadhaar, Mobile
b. Jal, Anna, Makan
c. Jobs, Agriculture, Manufacturing
d. Jan Dhan, Ayushman, MUDRA
Ans: A
Explanation: JAM links bank accounts, Aadhaar and mobiles for leak-proof DBT.

5. PMJDY accounts are classified as:
a. Current accounts
b. Basic Savings Bank Deposit accounts
c. Recurring deposit accounts
d. Small savings accounts
Ans: B
Explanation: They are zero-balance BSBD accounts as defined by RBI.

Exam tip: Revise PM Jan Dhan Yojana together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about 12 years of PMJDY, Click here.

PM Jan Dhan Yojana Completes 12 Years: 6 Key Facts for UPSC Prelims Read More Β»

Indian Standard Time Rules 2026: IST Mandatory, NavIC, 82.5Β°E – 8 Prelims Facts

The Indian Standard Time Rules 2026 – formally the Legal Metrology (Indian Standard Time) Rules, 2026 – make IST the single mandatory time reference for all legal, commercial and official purposes in India. This note covers the Indian Standard Time Rules 2026 with the static geography and NavIC links examiners test.

Indian Standard Time Rules 2026

Why in News?

The Centre notified the Legal Metrology (Indian Standard Time) Rules, 2026 under the Legal Metrology Act, 2009, with a 180-day compliance window.

The Rules mandate IST for all legal, administrative, commercial and official purposes and provide for time dissemination through NavIC and other approved Indian timing sources.

Indian Standard Time Rules 2026: Key Facts for Prelims

  • Part of the ‘One Nation, One Time’ initiative of the Department of Consumer Affairs with CSIR-NPL and ISRO.
  • Display of any time other than IST for official/commercial purposes is barred, except for astronomy, navigation, scientific research and similar notified purposes.
  • A White Rabbit technology-based IST Dissemination Demonstration Network was commissioned at the Regional Reference Standard Laboratory (RRSL) to serve banking, telecom, power, transport and digital governance.
  • Aim: secure, traceable time for cyber-security, financial transactions, 5G networks and the power grid, reducing dependence on foreign GPS time.

Indian Standard Time – static points

  • IST = UTC + 5:30; based on the 82Β°30β€²E (82.5Β°E) meridian.
  • The standard meridian passes near Mirzapur (Uttar Pradesh) and runs through five states: Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Odisha and Andhra Pradesh.
  • Custodian: CSIR-National Physical Laboratory (NPL), New Delhi, using caesium atomic clocks.
  • India spans about 30Β° of longitude (68Β°7β€²E to 97Β°25β€²E) – roughly a two-hour difference between Gujarat and Arunachal Pradesh, which fuels the demand for a separate north-east time zone.

NavIC – static points

  • Navigation with Indian Constellation, developed by ISRO; formerly IRNSS.
  • Regional system covering India and up to 1,500 km beyond its borders.
  • Constellation of 7 satellites: 3 in Geostationary Orbit (GEO) and 4 in Inclined Geosynchronous Orbit (IGSO).
  • Services: Standard Positioning Service (civil) and Restricted Service (strategic); second-generation NVS series satellites carry an indigenous Rubidium atomic clock and L1 band.

Quick Revision Table: Indian Standard Time Rules 2026

PointDetail
RulesLegal Metrology (Indian Standard Time) Rules, 2026
Parent ActLegal Metrology Act, 2009
Compliance window180 days
InitiativeOne Nation, One Time
IST offset / meridianUTC+5:30 / 82.5Β°E
Time custodianCSIR-NPL, New Delhi
NavIC constellation7 satellites (3 GEO + 4 IGSO)

Trap / Confusing Points: Indian Standard Time Rules 2026

ConfusionCorrect Position
IST is maintained by ISRONo – CSIR-NPL keeps IST; ISRO’s NavIC disseminates it
Standard meridian passes through Allahabad cityIt passes near Mirzapur (close to Prayagraj), not through Prayagraj city
Standard meridian passes through TelanganaNo – UP, MP, Chhattisgarh, Odisha, Andhra Pradesh
NavIC is a global system like GPSNo – regional, India + 1,500 km

5 Practice MCQs on Indian Standard Time Rules 2026

1. The Indian Standard Time Rules 2026 have been notified under which Act?
a. Standards of Weights and Measures Act, 1976
b. Legal Metrology Act, 2009
c. Bureau of Indian Standards Act, 2016
d. Consumer Protection Act, 2019
Ans: B
Explanation: The Rules are framed under the Legal Metrology Act, 2009 by the Department of Consumer Affairs.

2. The Standard Meridian of India passes through which of the following states?
a. Telangana
b. Bihar
c. Odisha
d. Jharkhand
Ans: C
Explanation: 82.5Β°E passes through UP, MP, Chhattisgarh, Odisha and Andhra Pradesh.

3. Which institution is the custodian of Indian Standard Time?
a. ISRO
b. CSIR-NPL
c. Survey of India
d. IMD
Ans: B
Explanation: CSIR-National Physical Laboratory, New Delhi maintains IST with atomic clocks.

4. How many satellites form the NavIC constellation?
a. 4
b. 7
c. 11
d. 24
Ans: B
Explanation: Seven satellites – three GEO and four IGSO.

5. ‘White Rabbit’ technology mentioned in the news relates to:
a. Quantum computing
b. Sub-nanosecond time synchronisation over networks
c. Satellite launch recovery
d. Weather forecasting
Ans: B
Explanation: White Rabbit is a CERN-developed protocol for precise time dissemination over Ethernet.

Exam tip: Revise Indian Standard Time Rules 2026 together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the IST Rules notification, Click here.

Indian Standard Time Rules 2026: IST Mandatory, NavIC, 82.5Β°E – 8 Prelims Facts Read More Β»

Sone River Water Sharing Pact: Bihar–Jharkhand End 25-Year Dispute (UPSC Notes)

The Sone River water sharing dispute between Bihar and Jharkhand has been resolved through an MoU signed in the presence of the Union Home Minister. This note covers the Sone River water sharing pact and the river’s geography for prelims.

Sone River water sharing

Why in News?

Bihar and Jharkhand signed an MoU to divide the 7.75 million acre-feet (MAF) of Sone water originally allotted to undivided Bihar under the 1973 Bansagar Agreement.

The pact ends a dispute pending since Jharkhand’s creation in 2000 and will provide irrigation to lakhs of farmers and drinking water in both states.

Sone River water sharing: Key Facts for Prelims

  • Bansagar Agreement (1973): signed by Madhya Pradesh, Uttar Pradesh and Bihar for the Bansagar dam on the Sone; water share was fixed for undivided Bihar.
  • Bansagar Dam is in Shahdol district, Madhya Pradesh; Indrapuri Barrage (Bihar) is the main diversion structure on the Sone.
  • The MoU was facilitated by the Centre (Ministry of Home Affairs / Inter-State Council mechanism) rather than by a tribunal.
  • Beneficiary regions: Sone command area districts of south Bihar (Rohtas, Kaimur, Bhojpur, Aurangabad, Patna etc.) and Palamu region of Jharkhand.

Sone River – geography for prelims

  • Second-largest southern (right-bank) tributary of the Ganga after the Yamuna.
  • Origin: near Amarkantak (Maikal Range), Madhya Pradesh/Chhattisgarh border – just east of the source of the Narmada.
  • Flows through five states: Chhattisgarh, Madhya Pradesh, Uttar Pradesh, Jharkhand and Bihar; joins the Ganga near Patna (Maner).
  • Tributaries: Rihand, Koel (North Koel), Kanhar, Gopad, Johilla. Rihand Dam (Govind Ballabh Pant Sagar) is on the Rihand in UP.
  • Notable: Sone is a ‘gold-yielding’ river (Hiranyabahu in ancient texts); Dehri-on-Sone bridge was once among Asia’s longest.

Inter-state water disputes – constitutional links

  • Article 262: Parliament may provide for adjudication of inter-state river disputes and bar court jurisdiction.
  • Inter-State River Water Disputes Act, 1956 (tribunals) and River Boards Act, 1956.
  • Article 263: Inter-State Council (set up in 1990 on Sarkaria Commission advice).
  • Active tribunals: Krishna (KWDT-II), Mahadayi, Vansadhara, Mahanadi, Ravi-Beas.

Quick Revision Table: Sone River water sharing

PointDetail
PartiesBihar and Jharkhand
Water divided7.75 MAF (undivided Bihar’s share)
Base agreementBansagar Agreement 1973 (MP, UP, Bihar)
Bansagar Dam locationShahdol, Madhya Pradesh
Sone originAmarkantak, Maikal Range
Ganga tributary rank2nd largest right-bank tributary after Yamuna
Constitutional provisionArticle 262 + ISRWD Act 1956

Trap / Confusing Points: Sone River water sharing

ConfusionCorrect Position
Sone is a left-bank tributary of the GangaNo – right-bank (southern) tributary
Sone and Narmada flow in the same directionNo – Narmada flows west to the Arabian Sea; Sone flows north-east to the Ganga
Dispute settled by a tribunal awardNo – settled by an MoU between the states
Bansagar Dam is in BiharNo – in Madhya Pradesh (Shahdol)

5 Practice MCQs on Sone River water sharing

1. The Sone River originates near:
a. Mahabaleshwar
b. Amarkantak
c. Nasik
d. Betul
Ans: B
Explanation: Sone rises near Amarkantak in the Maikal Range, close to the Narmada’s source.

2. The Bansagar Agreement of 1973 was signed among which states?
a. Bihar, Jharkhand, Odisha
b. Madhya Pradesh, Uttar Pradesh, Bihar
c. Uttar Pradesh, Bihar, West Bengal
d. Madhya Pradesh, Chhattisgarh, Bihar
Ans: B
Explanation: MP, UP and (undivided) Bihar signed it for the Bansagar project on the Sone.

3. Which of the following is NOT a tributary of the Sone?
a. Rihand
b. Koel
c. Kanhar
d. Kosi
Ans: D
Explanation: Kosi is a left-bank tributary of the Ganga from Nepal; Rihand, Koel and Kanhar feed the Sone.

4. Article 262 of the Constitution deals with:
a. Inter-State Council
b. Adjudication of inter-state river water disputes
c. Finance Commission
d. Zonal Councils
Ans: B
Explanation: Article 262 lets Parliament legislate on inter-state river disputes and exclude court jurisdiction.

5. The Sone River joins the Ganga near:
a. Varanasi
b. Patna
c. Bhagalpur
d. Allahabad
Ans: B
Explanation: The confluence is at Maner, west of Patna.

Exam tip: Revise Sone River water sharing together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the Sone water pact, Click here.

Sone River Water Sharing Pact: Bihar–Jharkhand End 25-Year Dispute (UPSC Notes) Read More Β»

INS Nipun Commissioned: 2nd Nistar-Class Diving Support Vessel – UPSC Facts

INS Nipun, the Indian Navy’s second indigenous Nistar-class Diving Support Vessel, has been commissioned at the Naval Dockyard in Mumbai. This note gives the INS Nipun facts and the submarine-rescue background needed for prelims.

INS Nipun

Why in News?

The Indian Navy commissioned INS Nipun, a Deep Sea Diving Support Vessel (DSV), at Mumbai.

It is the second ship of the Nistar-class, after INS Nistar (commissioned in 2025 at Visakhapatnam).

INS Nipun: Key Facts for Prelims

  • Builder: Hindustan Shipyard Limited (HSL), Visakhapatnam, Andhra Pradesh – a Defence PSU.
  • Role: acts as mother ship for Deep Submergence Rescue Vehicles (DSRVs) for rapid submarine rescue; also supports saturation diving up to about 300 m and salvage operations.
  • Around 80% indigenous content; equipped with a remotely operated vehicle, side-scan sonar and a helicopter deck.
  • Base: it will serve the Western Naval Command (Mumbai); INS Nistar serves the Eastern Naval Command (Visakhapatnam).
  • India acquired two DSRVs from the UK (James Fisher Defence) in 2018–19, making it one of the few navies with integral submarine rescue capability.

Interconnected static points

  • Hindustan Shipyard Limited: India’s oldest shipyard (founded 1941 as Scindia Shipyard); transferred to the Ministry of Defence in 2010.
  • Naval commands: Western (Mumbai), Eastern (Visakhapatnam), Southern (Kochi – training).
  • Navy Day: 4 December (Operation Trident, 1971). Recent inductions: INS Vikrant (indigenous carrier, 2022), INS Arighaat (SSBN, 2024), INS Tamal (last imported frigate, 2025).
  • Submarine rescue terminology: DSRV mates with a disabled submarine’s hatch; saturation diving lets divers work at depth for prolonged periods.

Quick Revision Table: INS Nipun

PointDetail
Vesselit
ClassNistar-class Diving Support Vessel
Order in classSecond (after INS Nistar)
BuilderHindustan Shipyard Ltd, Visakhapatnam
Commissioned atNaval Dockyard, Mumbai
Key roleMother ship for DSRV submarine rescue
Indigenous contentAbout 80%

Trap / Confusing Points: INS Nipun

ConfusionCorrect Position
it was built at Mazagon DockNo – Hindustan Shipyard Limited, Visakhapatnam
INS Nipun is a submarineNo – a surface Diving Support Vessel supporting submarine rescue
Nistar and Nipun are aircraft carriersNo – DSVs; carriers are Vikrant and Vikramaditya
HSL is under the Shipping MinistryNo – under the Ministry of Defence since 2010

5 Practice MCQs on it

1. INS Nipun is the second ship of which class?
a. Nilgiri-class
b. Nistar-class
c. Visakhapatnam-class
d. Arnala-class
Ans: B
Explanation: Nistar-class Diving Support Vessels: INS Nistar (2025) and it.

2. INS Nipun was built by:
a. Mazagon Dock Shipbuilders
b. Cochin Shipyard
c. Hindustan Shipyard Limited
d. Garden Reach Shipbuilders
Ans: C
Explanation: HSL, Visakhapatnam built both Nistar-class vessels.

3. A Deep Submergence Rescue Vehicle (DSRV) is used for:
a. Mine clearance
b. Rescuing crew of a disabled submarine
c. Anti-submarine warfare
d. Oceanographic survey
Ans: B
Explanation: DSRVs mate with a stricken submarine to evacuate its crew.

4. Indian Navy Day is celebrated on 4 December to commemorate:
a. Operation Vijay
b. Operation Trident
c. Operation Cactus
d. Operation Pawan
Ans: B
Explanation: Operation Trident (1971) was the naval attack on Karachi harbour.

5. Hindustan Shipyard Limited is located in:
a. Kochi
b. Kolkata
c. Visakhapatnam
d. Goa
Ans: C
Explanation: HSL is India’s oldest shipyard, at Visakhapatnam, Andhra Pradesh.

Exam tip: Revise it together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the commissioning of INS Nipun, Click here.

INS Nipun Commissioned: 2nd Nistar-Class Diving Support Vessel – UPSC Facts Read More Β»

Aravalli Engine: HAL–Safran Deal for IMRH Helicopters – 7 Facts for UPSC

The Aravalli engine will be the first high-power helicopter engine designed and developed in India, after HAL and Safran Helicopter Engines signed the contract through their joint venture SAFHAL. Here are the Aravalli engine facts for prelims.

Aravalli engine

Why in News?

Hindustan Aeronautics Limited (HAL) and France’s Safran Helicopter Engines agreed to jointly design, develop and manufacture the Aravalli engine for India’s planned 13-tonne Indian Multi-Role Helicopter (IMRH) and its naval variant, the Deck-Based Multi-Role Helicopter (DBMRH).

The contract, signed through the 50:50 joint venture SAFHAL Helicopter Engines Pvt Ltd, covers development, supply and lifecycle support.

Aravalli engine: Key Facts for Prelims

  • Power class: new-generation 3,500–4,000 shaft horsepower (shp) turboshaft engine.
  • First time a high-power helicopter engine is being designed and developed in India.
  • IMRH is meant to replace the Mi-17 fleet of the IAF and Army and the Sea King fleet of the Navy from the 2030s.
  • HAL–Safran already co-produce the Shakti (Ardiden 1H1) engine that powers ALH Dhruv, Rudra and LCH Prachand.
  • SAFHAL: HAL–Safran joint venture formed in 2023, headquartered in Bengaluru.

Interconnected static points

  • HAL: Navratna Defence PSU, HQ Bengaluru, founded 1940 as Hindustan Aircraft Ltd by Walchand Hirachand.
  • HAL helicopters: ALH Dhruv, Rudra (armed Dhruv), LCH Prachand, LUH (Light Utility Helicopter), IMRH (under development).
  • Turboshaft vs turbofan: helicopters use turboshaft engines that deliver power via a shaft to the rotor; fighters use turbofans (e.g., GE F404 for Tejas).
  • Other India–France defence links: Rafale, Scorpene (P-75), Safran–DRDO talks on a 110 kN engine for AMCA.

Quick Revision Table: Aravalli engine

PointDetail
EngineAravalli
PartnersHAL + Safran Helicopter Engines (via SAFHAL JV)
Power3,500–4,000 shp
PlatformsIMRH (13-tonne) and DBMRH (naval)
ReplacesMi-17 and Sea King fleets
Existing HAL–Safran engineShakti (for Dhruv, Rudra, Prachand)
SignificanceFirst high-power helicopter engine developed in India

Trap / Confusing Points: Aravalli engine

ConfusionCorrect Position
Aravalli engine powers LCH PrachandNo – Prachand uses Shakti; Aravalli is for IMRH/DBMRH
Aravalli is a jet engine for fightersNo – turboshaft engine for helicopters
Safran is a US companyNo – French aerospace company
IMRH is a light helicopterNo – 13-tonne medium-lift multi-role helicopter

5 Practice MCQs on Aravalli engine

1. The Aravalli engine is being developed to power which helicopter?
a. Light Combat Helicopter Prachand
b. Light Utility Helicopter
c. Indian Multi-Role Helicopter
d. ALH Dhruv
Ans: C
Explanation: Aravalli will power the 13-tonne IMRH and its naval variant DBMRH.

2. SAFHAL Helicopter Engines is a joint venture between HAL and:
a. Rolls-Royce
b. Safran
c. Pratt & Whitney
d. General Electric
Ans: B
Explanation: SAFHAL is a 50:50 JV of HAL and Safran Helicopter Engines (France).

3. The Shakti engine that powers the ALH Dhruv was co-developed by HAL with:
a. Turbomeca/Safran
b. Klimov
c. Honeywell
d. Rolls-Royce
Ans: A
Explanation: Shakti is the Indian version of Safran’s (Turbomeca) Ardiden 1H1.

4. Which type of engine is used in helicopters?
a. Turbofan
b. Turbojet
c. Turboshaft
d. Ramjet
Ans: C
Explanation: Turboshaft engines deliver power to the rotor through a shaft.

5. HAL is headquartered at:
a. Hyderabad
b. Nashik
c. Bengaluru
d. Kanpur
Ans: C
Explanation: HAL’s corporate office is in Bengaluru, Karnataka.

Aravalli engine and India’s helicopter self-reliance

The Aravalli engine programme fits into India’s push for defence indigenisation under Atmanirbhar Bharat.

Helicopter engines have long been India’s weakest link in aerospace manufacturing, with rotary-wing platforms depending on imported powerplants from France, Russia or the US.

A jointly developed Aravalli engine, built with technology transfer and local production, cuts this dependence for the IMRH and future army and naval variants.

For prelims, remember that engine technology (unlike airframes) is India’s biggest indigenisation gap, tested alongside the Tejas engine (GE F404/F414) and the Kaveri engine programme.

Exam tip: Revise Aravalli engine together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about the HAL–Safran Aravalli contract, Click here.

Aravalli Engine: HAL–Safran Deal for IMRH Helicopters – 7 Facts for UPSC Read More Β»

ICGS Ajit: 7th Adamya-Class Fast Patrol Vessel Joins Indian Coast Guard

ICGS Ajit, the seventh Adamya-class Fast Patrol Vessel, has been handed over by Goa Shipyard Limited to the Indian Coast Guard. This note covers ICGS Ajit and the Coast Guard facts that appear in prelims.

ICGS Ajit

Why in News?

Goa Shipyard Limited (GSL) formally handed over the Fast Patrol Vessel ICGS Ajit to the Indian Coast Guard, strengthening coastal surveillance capability.

ICGS Ajit: Key Facts for Prelims

  • Type: Fast Patrol Vessel (FPV) – a small, agile ship for high-speed interception and coastal watch.
  • Class: seventh vessel of the Adamya-class (eight FPVs ordered from GSL; first was ICGS Adamya).
  • Builder: Goa Shipyard Limited – a Defence PSU under the Ministry of Defence; over 60% indigenous content.
  • Roles: coastal patrol, fisheries protection, anti-smuggling, search and rescue, pollution response.
  • Features: controllable-pitch propellers with gearboxes for manoeuvrability, 30 mm CRN-91 gun and 12.7 mm remote-controlled guns.

Indian Coast Guard – static points

  • Established 1 February 1977 (interim); statutory under the Coast Guard Act, 1978.
  • Functions under the Ministry of Defence; motto ‘Vayam Rakshamah’ (We Protect).
  • Fourth armed force of India; headed by the Director General; HQ New Delhi; five regions (West, East, North-East, Andaman & Nicobar, North-West).
  • Coast Guard Day: 1 February. Key exercises: SAREX (search and rescue), Sahyog-HOP TAC (with Vietnam), Sahyog-Kaijin (with Japan).

Quick Revision Table: ICGS Ajit

PointDetail
VesselICGS Ajit
TypeFast Patrol Vessel
ClassAdamya-class (7th of 8)
BuilderGoa Shipyard Limited (DPSU)
OperatorIndian Coast Guard
Main rolesPatrol, fisheries protection, SAR
ICG parent ministryMinistry of Defence

Trap / Confusing Points: ICGS Ajit

ConfusionCorrect Position
Indian Coast Guard is under the Home MinistryNo – Ministry of Defence (unlike BSF/CRPF)
ICGS Ajit is an Offshore Patrol VesselNo – Fast Patrol Vessel (smaller than OPV)
Built by Mazagon DockNo – Goa Shipyard Limited
First ship of its classNo – seventh; ICGS Adamya was first

5 Practice MCQs on ICGS Ajit

1. ICGS Ajit belongs to which class of vessels?
a. Samarth-class
b. Adamya-class
c. Vikram-class
d. Sachet-class
Ans: B
Explanation: It is the seventh Adamya-class fast patrol vessel.

2. Goa Shipyard Limited functions under which ministry?
a. Ministry of Ports, Shipping and Waterways
b. Ministry of Defence
c. Ministry of Heavy Industries
d. Ministry of Home Affairs
Ans: B
Explanation: GSL is a Defence Public Sector Undertaking under the Ministry of Defence.

3. The Indian Coast Guard was established under the Coast Guard Act of:
a. 1971
b. 1977
c. 1978
d. 1982
Ans: C
Explanation: It began in 1977 and was formally constituted by the Coast Guard Act, 1978.

4. Sahyog-HOP TAC is a Coast Guard exercise between India and:
a. Japan
b. Sri Lanka
c. Vietnam
d. Indonesia
Ans: C
Explanation: Sahyog-HOP TAC is the India–Vietnam Coast Guard joint exercise.

5. Indian Coast Guard Day is observed on:
a. 4 December
b. 1 February
c. 15 January
d. 26 January
Ans: B
Explanation: 1 February marks the Coast Guard’s raising day.

Exam tip: Revise ICGS Ajit together with the static links above; UPSC and APPSC prelims often frame questions from these interconnections.

To learn current affairs from exam point of view, Click here.

To know more about ICGS Ajit handover, Click here.

ICGS Ajit: 7th Adamya-Class Fast Patrol Vessel Joins Indian Coast Guard Read More Β»