💥UPSC 2026, 2027, 2028 UAP Mentorship (March Batch) + Access XFactor Notes & Microthemes PDF

Type: Prelims Only

  • Innovations in Sciences, IT, Computers, Robotics and Nanotechnology

    Scientists discover new ‘Quasicrystals’

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Quasicrystals

    Mains level: NA

    quasicrystals

    Scientists have discovered a new type of quasicrystal, one with 12-fold symmetry, in the Sand Hills of north central Nebraska, USA.

    What is a Quasicrystal?

    • Quasicrystal is essentially a crystal-like substance.
    • However, unlike a crystal, in which atoms are arranged in a repeating pattern, a quasicrystal consists of atoms that are arranged in a pattern that doesn’t repeat itself regularly.
    • For the longest time, physicists believed every crystalline arrangement of atoms must have a pattern that repeats itself perfectly over and over again.
    • However, this changed in 1982, when material scientist Dan Shechtman discovered crystal structures that are mathematically regular, but that do not repeat themselves.

    How are they formed?

    • Electrical discharge triggered quasicrystal formation in the recent finding.
    • It’s also the first time that researchers have found a quasicrystal somewhere other than meteorites or the debris from nuclear blasts.

    Applications of quasicrystals

    • There is no major commercial applications yet exploit properties of the quasicrystalline state directly.
    • Quasicrystals form in compounds noted for their high strength and light weight, suggesting potential applications in aerospace and other industries.
    • They can be used in surgical instruments, LED lights and non-stick frying pans.

     

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  • ISRO Missions and Discoveries

    In news: Agasthyarkoodam Observatory

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Agasthyarkoodam Observatory

    Mains level: NA

    agasthyarkoodam

    Agasthyarkoodam was once home to a forgotten and long-lost 19th-century observatory established by Scottish meteorologist John Allan Broun.

    Agasthyarkoodam Observatory

    • The Agasthyarkoodam Observatory is an astronomical research observatory located in the state of Kerala.
    • The observatory is situated at an altitude of 1600 meters above sea level and is owned and operated by the Indian Institute of Astrophysics (IIA).
    • The observatory is equipped with a 1-meter optical telescope and various other instruments for studying the night sky.
    • The observatory is used for research and educational purposes and is open to the public for viewing night-sky objects.

    Why in news?

    • Agasthyarkoodam in the Western Ghats once housed a magnetic observatory that was established by Scottish meteorologist John Allan Broun.
    • Broun used it to record magnetic and meteorological observations in tandem with the Thiruvananthapuram astronomical observatory.
    • Broun’s astronomical research in India began after he was invited by the ruler of the erstwhile Travancore Uthram Tirunal Marthanda Varma to helm the Thiruvananthapuram observatory following the death of its first director John Caldecott in 1849.
    • The observatory started recording observations in July 1855.
    • However, it was closed in 1881 by the then Madras Governor Sir William Denison.

    What are magnetic observatories?

    • Magnetic observatories continuously measure and record Earth’s magnetic field at a number of locations.
    • In an observatory of this sort, magnetized needles with reflecting mirrors are suspended by quartz fibres.
    • Light beams reflected from the mirrors are imaged on a photographic negative mounted on a rotating drum.
    • Variations in the field cause corresponding deflections on the negative.
    • Their magnetograms are photographed on microfilm and submitted to world data centres, where they are available for scientific or practical use.

     

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  • International Space Agencies – Missions and Discoveries

    What is Solar Prominence?

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Solar Prominence

    Mains level: Not Much

    solar

    Recently, the sun puzzled many scientists with a large prominence near its north pole.

    What is Solar Prominence?

    • A solar prominence (also known as a filament when viewed against the solar disk) is a large, bright feature extending outward from the Sun’s surface.
    • Prominences are anchored to the Sun’s surface in the photosphere, and extend outwards into the Sun’s hot outer atmosphere, called the corona.
    • A prominence forms over timescales of about a day, and stable prominences may persist in the corona for several months, looping hundreds of thousands of miles into space.

    How are they formed?

    • Scientists are still researching how and why prominences are formed.
    • The red-glowing looped material is plasma, a hot gas comprised of electrically charged hydrogen and helium.
    • The prominence plasma flows along a tangled and twisted structure of magnetic fields generated by the sun’s internal dynamo.
    • An erupting prominence occurs when such a structure becomes unstable and bursts outward, releasing the plasma.

     

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  • Roads, Highways, Cargo, Air-Cargo and Logistics infrastructure – Bharatmala, LEEP, SetuBharatam, etc.

    In news: Delhi-Mumbai Expressway

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Delhi-Mumbai Expressway

    Mains level: Road infrastructure

    delhi

    Photos of the soon-to-be-inaugurated Delhi-Mumbai Expressway have gone viral, receiving widespread appreciation online.

    Delhi-Mumbai Expressway

    • The Delhi-Mumbai Expressway is a proposed 1380 km expressway that will link the capital city of Delhi to Mumbai, India.
    • The expressway is being planned as a six-lane expressway and will pass through the states of Uttar Pradesh, Rajasthan, Madhya Pradesh and Maharashtra.
    • Started in 2018, the project is set to be completed by the end of 2023.
    • The expressway is expected to reduce the travel time between Delhi and Mumbai by up to 12 hours.
    • The expressway will also have several rest stops and will be equipped with advanced technology such as electronic toll collection, smart traffic management and surveillance systems.
    • The expressway will be built in a Public-Private Partnership (PPP) model.

    Some basic details

    • The expressway is being constructed with an initial budget of INR 98,000 crore.
    • According to claims by the Ministry of Road Transport and Highways, it will reduce the distance between Delhi and Mumbai by 180 km (from 1424 km to 1242 km).
    • Depending on the volume of traffic the expressway sees, there are plans in place to expand it to a 12-lane expressway in the future.
    • The reduction in distance and travel time is set to result in annual fuel savings of more than 320 million litres and reduce CO2 emissions by 850 million kg.

    Some unique features

    • Importantly, the Delhi-Mumbai Expressway is set to introduce certain features seldom seen in road construction in India.
    • According to claims from the Ministry of Road Transport and Highways, the expressway will boast of a state-of-art traffic management system.
    • There will also be a dedicated three metre wide corridor for laying utility lines including fibre optic cables, pipelines as well as solar power generation.
    • The expressway will also have provisions for rain water harvesting at intervals of 500 m, with over 2000+ water recharge points.

    Provisions for wildlife conservation

    • A crucial feature of the project will be its provisions for “wildlife conservation”.
    • The expressway is the first in Asia and only the second in the world to feature animal overpasses and underpasses to facilitate unrestricted movement of wildlife.
    • Furthermore, the expressway has been aligned in a way to minimize the destruction of protected forests.
    • Two iconic 8-lane tunnels will also be built, one through Mukundra sanctuary without disturbing the endangered fauna in the region and the second through the Matheran eco-sensitive zone.
    • A 3 ft tall boundary wall and sound barriers will also be constructed in sections prone to wildlife.

     

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  • Modern Indian History-Events and Personalities

    Today in History: Treaty of Alinagar

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Treaty of Alinagar

    Mains level: Not Much

    alinagar

    Signed on February 9, 1757, the Treaty of Alinagar between the Nawab of Bengal and the East India Company raised the curtains for British colonial expansion in India.

    Treaty of Alinagar, 1757

    • Signed on February 9, 1757, the Treaty of Alinagar was signed between Robert Clive of the East India Company and Mirza Muhammad Siraj Ud Daula, then Nawab of Bengal.
    • It is said to be one of the key events leading up to the Battle of Plassey later that year.
    • Plassey was where the English laid a significant blow, defeating the nawab. It paved the way for the East India Company’s takeover of Bengal.
    • The name Alinagar was a short-lived reference to modern-day Kolkata, and the treaty came about after the nawab was faced with both the British and Afghan forces.
    • He compromised with the former; however, the peace was short-lived.

    British advent in India: A quick backgrounder

    • After the Anglo-Mughal War which took place between 1686 and 1690, the British began consolidating their presence in the subcontinent.
    • It had established the Fort St. George in what was Madras, Fort William in then Calcutta and Bombay Castle by the beginning of the 18th century.
    • The British initially helped local princes and nawabs quell uprisings or revolts and they, in turn, gave them concessions.

    Course of the treaty

    • In January 1757, the British attacked the town of Hooghly, close to then Calcutta, with over 700 men.
    • The Nawab of Bengal, Siraj-ud-daulah, who had just come to power a year earlier in his early 20s, mobilised forces.
    • His troops would overpower the British and reach Calcutta on January 10, 1757, having lost over 600 men.
    • However, the losses sustained in the war had resulted in the nawab losing confidence.
    • He signed what came to be known as the Treaty of Alinagar with Robert Clive – who became the first British Governor of the Bengal Presidency – on February 9, 1757.
    • Siraj-ud-daulah agreed to the restoration of the company’s factories and allowed for the fortification of Calcutta.

    Aftermath of the battle

    • The British then moved on to wrest the remaining territories in Bengal from the French, laying siege to Chandannagar.
    • However, the move did not go down well with the nawab.
    • But, Daulah was also wary of Afghan forces under Ahmad Shah Durrani and the Marathas.
    • Traders in his kingdom were already wary of him and there was a conspiracy led by the likes of his military general, Mir Jafar.
    • Events would later culminate in the Battle of Plassey on June 23, 1757.
    • It resulted in the East India Company gaining hold of Bengal and was a significant event in its rise to power in the subcontinent.

    Try this question.

    Q.For most Indians, the history of British colonial rule in India begins in Plassey. However, the roots of it were sown long back. Discuss. (250W)

     

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  • Russian Invasion of Ukraine: Global Implications

    US bombed Nord Stream Gas Pipeline

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Nord Stream Pipelines

    Mains level: Not Much

    nord

    An American investigative journalist has claimed that the September 2022 bombing of the undersea Nord Stream gas pipelines was carried out by the US Central Intelligence Agency (CIA).

    What is Nord Stream Pipeline?

    (1) Nord Stream 1:

    • Nord Stream 1 is the biggest pipeline transporting natural gas between Russia and Europe via Germany.
    • It is a system of offshore natural gas pipelines running under the Baltic Sea from Russia to Germany.
    • Nord Stream 1 is a 1,224 km underwater gas pipeline that runs from Vyborg in northwest Russia to Lubmin in northeastern Germany via the Baltic Sea.

    (2) Nord Stream 2:

    • Russian threats to choke this gas supply to Europe present an economic threat to Germany.
    • To expand options and double the supply from Russia, Germany decided to build Nord Stream 2.
    • The construction of the $11 billion-worth Nord Stream 2 was completed in 2021 but never began commercial operations.

    Why the Nord Stream pipeline is so much in news?

    • For Germany: Energy prices in Germany, Europe’s largest economy, are among the lowest in the continent because of the cheap gas supplies via Nord Stream 1. This also makes German manufactured goods more competitive in the international market.
    • For European Union: In 2021, Russia supplied nearly 40 per cent of the EU’s natural gas needs through this pipeline. The flows through Nord Stream play a vital role in filling up the national storage tanks of EU. It is crucial to provide the required heating in the upcoming winter.
    • For Russia: Russia is using the supplies via the crucial pipeline as a bargain to navigate its economy through sanctions from the western countries.

    What is the current status of Nord Stream Pipeline?

    • Nord stream pipeline is the largest single supply route for Russian gas to Europe. The Russian state owned gas company Gazprom has a majority ownership in the pipeline.
    • While it was running at just 20% of its capacity since the Russia-Ukraine conflict began, the company, in early September fully cut gas flows from the pipeline on the pretext of maintenance.
    • According to Bloomberg, while 40% of Europe’s pipeline gas came from Russia before Russia Ukraine the war, the number now stands at just 9%.
    • Even though both pipelines were not running commercially, they had millions of cubic metres of gas stored in them.

     

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  • ISRO Missions and Discoveries

    ISRO’s SSLV-D2 launched successfully

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: PSLV, SSLV, GSLV

    Mains level: Not Much

    sslv

    The Indian Space Research Organisation (ISRO) will undertake the second development flight of the Small Satellite Launch Vehicle (SSLV –D2).

    Payload details

    The SSLV-D2 is intended to inject ISRO’s EOS-07, U.S.-based firm Antaris’ Janus-1 and Chennai-based space start-up Space Kidz’s AzaadiSAT-2 satellites into a 450-km circular orbit in its 15 minutes flight.

    • EOS-07: is a 156.3 kg satellite designed, developed and realized by the ISRO. Its mission objective is to design and develop payload instruments compatible with microsatellite buses and new technologies that are required for future operational satellites.
    • Janus-1: Weighing around 10.2 kg, Janus-1 is a technology demonstrator, smart satellite mission based on Antaris software platform.
    • AzaadiSAT-2: A 8.7-kg satellite, AzaadiSAT-2 is a combined effort of about 750 girl students across India guided by Space Kidz India, Chennai.

    What is SSLV?

    • The SSLV is a small-lift launch vehicle being developed by the ISRO with payload capacity to deliver:
    1. 600 kg to Low Earth Orbit (500 km) or
    2. 300 kg to Sun-synchronous Orbit (500 km)
    • It would help launching small satellites, with the capability to support multiple orbital drop-offs.
    • In future a dedicated launch pad in Sriharikota called Small Satellite Launch Complex (SSLC) will be set up.
    • A new spaceport, under development, near Kulasekharapatnam in Tamil Nadu will handle SSLV launches when complete.
    • After entering the operational phase, the vehicle’s production and launch operations will be done by a consortium of Indian firms along with NewSpace India Limited (NSIL).

    Vehicle details

    (A) Dimensions

    • Height: 34 meters
    • Diameter: 2 meters
    • Mass: 120 tonnes

    (B) Propulsion

    • It will be a four stage launching vehicle.
    • The first three stages will use Hydroxyl-terminated polybutadiene (HTPB) based solid propellant, with a fourth terminal stage being a Velocity-Trimming Module (VTM).

    SSLV vs. PSLV: A comparison

    • The SSLV was developed with the aim of launching small satellites commercially at drastically reduced price and higher launch rate as compared to Polar SLV (PSLV).
    • The projected high launch rate relies on largely autonomous launch operation and on overall simple logistics.
    • To compare, a PSLV launch involves 600 officials while SSLV launch operations would be managed by a small team of about six people.
    • The launch readiness period of the SSLV is expected to be less than a week instead of months.
    • The SSLV can carry satellites weighing up to 500 kg to a low earth orbit while the tried and tested PSLV can launch satellites weighing in the range of 1000 kg.
    • The entire job will be done in a very short time and the cost will be only around Rs 30 crore for SSLV.

    Significance of SSLV

    • SSLV is perfectly suited for launching multiple microsatellites at a time and supports multiple orbital drop-offs.
    • The development and manufacture of the SSLV are expected to create greater synergy between the space sector and private Indian industries – a key aim of the space ministry.

     

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  • Parliament – Sessions, Procedures, Motions, Committees etc

    Lack of Quorum in Lok Sabha

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Quorum

    Mains level: Features of parliamentary democracy

    The Lok Sabha began a discussion on the general Budget but the House had to be adjourned before the scheduled time due to lack of quorum.

    What is Quorum?

    • Quorum is the minimum number of members of a deliberative assembly necessary to conduct the business of that assembly.
    • Article 100 of the Indian Constitution states that the quorum to constitute a meeting of either House of Parliament shall be one-tenth of the total number of members of that House.
    • This means that the quorum of Lok Sabha (Lower House) is 55 and that of Rajya Sabha (Upper House) is 25.

    Who decides the Quorum?

    • The quorum is usually decided at the beginning of the session and if it is not present when a vote is taken, the vote is invalid.
    • In the event of inadequate quorum, the Speaker or the Chairman can adjourn the House or suspend the sitting till the quorum is present.

    Challenging a Quorum

    • Furthermore, the quorum can be challenged by any member of the House.
    • In the event that the quorum is challenged, the Speaker or the Chairman can direct that a count of the members present be taken.
    • If the quorum is not present, the House is adjourned. However, if the quorum is present, the business of the House is resumed.

     

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  • RBI Notifications

    RBI announces pilot for QR code-based Coin Vending Machine

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: QR coin vending

    Mains level: Not Much

    qr

    To improve the distribution of coins among members of the public, the Reserve Bank of India (RBI) is preparing a pilot project on QR code-based Coin Vending Machine (QCVM) in collaboration with a few leading banks.

    QR code-based Coin Vending Machine (QCVM)

    • The QCVM is a cashless coin dispensation machine which would dispense coins against a debit to the customer’s bank account using Unified Payments Interface (UPI).
    • Unlike cash-based traditional Coin Vending Machine, the QCVM would eliminate the need for physical tendering of banknotes and their authentication.
    • Customers will also have the option to withdraw coins in the required quantity and denominations in QCVMs.

    When will it be launched?

    • The pilot project is planned to be initially rolled out at 19 locations in 12 cities across the country.
    • Machines will be installed at public places such as railway stations, shopping malls, marketplaces to enhance ease and accessibility.
    • Based on the learnings from the pilot tests, guidelines would be issued to banks to promote better distribution of coins using QCVMs.

     

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  • Tribes in News

    Sarna Religion of the Tribals

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Sarna Religion

    Mains level: Tribal assertiveness

    sarna

    West Bengal Assembly has tabled a motion to recognize Sarna Religion of the tribals and have a Sarna Code.

    Sarna Religion

    • The followers of Sarna faith believe pray to nature.
    • The holy grail of the faith is “Jal (water), Jungle (forest), Zameen (land)” and its followers pray to the trees and hills while believing in protecting the forest areas.
    • Jharkhand has 32 tribal groups of which eight are from Particularly Vulnerable Tribal Groups.
    • While many follow Hindu religion, some have converted to Christianity — this has become one of the planks of demanding a separate code “to save religious identity”— as various tribal organisations put it.

    Demand for Sarna Code

    • Tribal groups in the region have long demanded the Sarna code, a separate religious classification in the census, recognising their status as independent religious communities.
    • It is believed that 50 lakhs tribal in the entire country put their religion as ‘Sarna’ in the 2011 census, although it was not a code.
    • The resolution will seek a special column for followers of the Sarna religion in the Census, 2021.
    • At present, they are not classified as a separate entity.

    Politics around the tribe

    • Many of the tribals who follow this faith have later converted to Christianity—the state has more than 4% Christians most of whom are tribals.
    • Some who still follow the Sarna faith believe the converted tribals are taking the benefits of reservation as a minority, as well as the benefits, are given to Schedule Tribes.
    • They also believe that benefits should be given specifically to them and not to those who have converted.

    What sense does a separate code make?

    • The protection of their language and history is an important aspect of tribals.
    • Between 1871 and 1951, the tribals had a different code. However, it was changed around 1961-62.
    • Experts argue that when today the entire world is focusing on reducing pollution and protecting the environment, it is prudent that Sarna becomes a religious code as the soul of this religion is to protect nature and the environment.

     

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