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

Civilsdaily

Login

Type: Prelims Only

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

    Fluorescent Nano-Diamonds (FND)

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Fluorescent Nano-Diamonds (FND)

    Why in the News?

    Scientists at Purdue University have figured out how to levitate and spin Fluorescent Nanodiamonds (FNDs) in a vacuum.

    What are FNDs?

    • Fluorescent Nanodiamonds (FNDs) are stable, non-toxic carbon nanoparticles that emit consistent fluorescence, have a lifespan over 10 nanoseconds, and can be levitated and spun for advanced quantum research applications.

    What are their Applications?

    • Medical Diagnostics: FNDs are used for high-resolution imaging and tracking cells over extended periods due to their non-toxic nature.
    • Temperature Sensing: FNDs can measure temperatures at the microscale, making them useful for scientific experiments.
    • Correlative Microscopy: Their fluorescent properties make them ideal for combining different types of imaging techniques.
    • Sensor Technologies: Due to their sensitivity to acceleration and electric fields, FNDs can be used in industry sensors and gyroscopes for rotation sensing.
    • Quantum Computing: FNDs doped with nitrogen can be used for quantum superposition experiments and future quantum computing applications.

    PYQ:

    [2022] Which one of the following is the context in which the term “qubit” is mentioned?

    (a) Cloud Services

    (b) Quantum Computing

    (c) Visible Light Communication Technologies

    (d) Wireless Communication Technologies

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Capital Markets: Challenges and Developments

    F&O: How will Sebi’s new rules affect traders and brokers?

    Prelims Only | Economics | Mains Paper 3: Effects Of Liberalization On The Economy, Changes In Industrial Policy and their effects on Industrial Growth

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: FandO Trading

    Why in the News?

    SEBI has introduced a six-step framework to protect investors and curb speculative trading, specifically targeting futures and options (F&O) trading by reducing volumes on expiry days and limiting retail participation.

    What are the Future and Options (F&O)?

    • Futures are contracts to buy or sell an asset (like stocks, indexes, or commodities) at a predetermined price on a future date.
    • Options give the right, but not the obligation, to buy or sell an asset at a set price before a certain date.

    SEBI’s Six-Step F&O Framework (Effective November 2024 – April 2025):

    In response to concerns about rising speculative trading, SEBI has outlined six key measures aimed at reducing retail interest in F&O trading:

    1. Upfront collection of options premiums
    2. Intraday monitoring of position limits
    3. Removing calendar spread benefits on expiry day
    4. Increasing the contract size for index derivatives
    5. Rationalizing weekly index derivatives to one benchmark per exchange
    6. Enhancing margin requirements on options expiry days

    Key Changes for Retail Investors:

    • Upfront Collection of Options Premiums: Retail investors must now pay the full premium upfront, limiting their ability to use high leverage in options trading.
    • Increased Contract Size: The minimum contract size for index derivatives is raised to ₹15 lakhs, reducing speculative retail participation by making it costlier to enter.
    • Rationalization of Weekly Expiries: Only one benchmark index per exchange can have weekly expiries, lowering speculative trading opportunities and intraday volatility.
    • Removal of Calendar Spread Benefits: Calendar spreads are no longer allowed on expiry days, discouraging aggressive trading strategies.

    Impact on Brokers and Revenue:

    • Decline in Trading Volumes: Brokers reliant on F&O trading will see reduced volumes due to fewer retail participants and higher barriers to entry.
    • Revenue Drop in Options Trading: Firms like Zerodha may face a 30-50% revenue drop as retail participation in options decreases.
    • Shift to Equity Trading: Retail investors may move towards equity trading, causing brokers to adapt their offerings.
    • Adaptation for Brokers: Brokers with a balanced mix of cash and derivatives will be less impacted, while those focused on F&O need to shift strategies.

    PYQ:

    [2021] With reference to India, consider the following statements:​

    1. Retail investors through demat account can invest in ‘Treasury Bills’ and ‘Government of India Debt Bonds’ in primary market.​

    2. The ‘Negotiated Dealing System-Order Matching’ is a government securities trading platform of the Reserve Bank of India. ​

    3. The ‘Central Depository Services Ltd.’ Is jointly promoted by the Reserve Bank of India and the Bombay Stock Exchange. ​

    Which of the statements given above is/are correct?​

    (a) 1 only ​

    (b) 1 and 2 only ​

    (c) 3 only ​

    (d) 2 and 3 only ​

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Panchayati Raj Institutions: Issues and Challenges

    Special Gram Sabhas on Gandhi Jayanti

    Prelims Only | Polity | Mains Paper 2: Panchayats & Local Bodies

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Gram Sabha

    Why in the News?

    The Ministry of Panchayati Raj is organizing special Gram Sabhas across 750 Gram Panchayats on 2nd October 2024, marking Gandhi Jayanti.

    Vision to Achieve Gram Swaraj Through People’s Participation

    • These special Gram Sabhas will embody Mahatma Gandhi’s vision of Gram Swaraj—a vision of self-reliant villages driven by people’s participation in decision-making.
    • It emphasizes community-led governance, where elders, women, and youth collaborate to develop Gram Panchayat Development Plans (GPDP).

    Lal Bahadur Shastri’s Legacy

    • The event also coincides with the birth anniversary of Lal Bahadur Shastri, India’s second Prime Minister.
    • Shastri championed the values of simplicity, self-reliance, and community development.
    • Shastri’s slogan, “Jai Jawan, Jai Kisan,” emphasized the strength of India’s rural economy and its farmers, making his vision a key component of this grassroots initiative.

    About Gram Sabha

    Details
    Role and Significance • Centerpiece of the Panchayati Raj system
    • Responsible for village development and local governance
    Constitutional Provision • Defined under Article 243(b) of the Indian Constitution
    • Primary body in the Panchayati Raj system
    • A permanent body
    Members • Individuals above 18 years of age
    • Must be residing in the village
    • Listed in the electoral rolls
    Meetings • Must meet 2 to 4 times annually as per State Panchayat Raj Acts
    • Common meeting dates:
    1. Republic Day (26th Jan)
    2. Labour Day (1st May)
    3. Independence Day (15th Aug)
    4. Gandhi Jayanti (2nd Oct)
    • Panchayats may choose other dates for meetings
    Organizing Body • Organized by the Panchayat Secretary (Gram Sevak)
    • Done with approval of the Sarpanch
    Conditions for Convening • 10% of members or 50 people (whichever is greater) can request a meeting
    • A written request must be submitted 5 days prior to the meeting
    Decision-Making Process • All decisions of the Panchayat require the approval and validation of the Gram Sabha
    Purpose • Discuss local governance and development issues
    • Make need-based plans for the village

     

    PYQ:

    [2012] In the areas covered under the Panchayat (Extension to the Scheduled Areas) Act, 1996, what is the role/power of Gram Sabha?

    1. Gram Sabha has the power to prevent alienation of land in the Scheduled Areas.
    2. Gram Sabha has the ownership of minor forest produce.
    3. Recommendation of Gram Sabha is required for granting prospecting licence or mining lease for any mineral in the Scheduled Areas.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 1 and 2 only

    (c) 2 and 3 only

    (d) 1, 2 and 3

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Innovations in Biotechnology and Medical Sciences

    BRCA Testing

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: BRCA1Testing

    Why in the News?

    Angelina Jolie’s case highlighted hereditary breast and ovarian cancer (HBOC) after she underwent preventive surgeries due to a BRCA1 gene mutation.

    What is BRCA Testing?

    • BRCA testing is a genetic test that looks for mutations in the BRCA1 and BRCA2 genes.
    • These genes normally help repair DNA, but when they are mutated, they increase a person’s risk of developing certain cancers, particularly breast and ovarian cancers.
    • BRCA testing identifies whether a person has inherited these mutations, which can lead to Hereditary Breast and Ovarian Cancer (HBOC) and other cancers.
    • The test is done using a blood or saliva sample, which is collected and sent to a laboratory for analysis.
    • In the lab, next-generation DNA sequencing or other genetic analysis methods are used to examine the BRCA1 and BRCA2 genes for harmful mutations.
    • The test results can show whether a person has inherited a harmful mutation in these genes.
      • If the result is positive, it means they are at a higher risk for developing certain cancers.

    Issues with BRCA Testing

    • BRCA testing in India is expensive, costing between ₹15,000 to ₹30,000, which makes it unaffordable for many, particularly in lower-income populations.
    • Testing is often only offered to individuals with a family history of cancer, which misses about 50% of people who may have the mutations but no known family history.

    Significance for India

    • Breast cancer is the most common cancer among women in India, accounting for 27% of all cancer cases.
    • Women with BRCA mutations have up to a 72% risk of developing breast cancer.
      • Early identification allows for preventive measures, such as regular screenings or surgeries, which can reduce cancer incidence by up to 100%.
    • By increasing access to population-wide BRCA testing, India can improve early detection and reduce the burden of cancer on its healthcare system.
      • Early identification can also lower treatment costs and improve outcomes.

    PYQ:

    [2019] ‘RNA interference (RNAi)’ technology has gained popularity in the last few years. Why?

    1. It is used in developing gene silencing therapies.
    2. It can be used in developing therapies for the treatment of cancer.
    3. It can be used to develop hormone replacement therapies.
    4. It can be used to produce crop plants that are resistant to viral pathogens.

    Select the correct answer using the codes given below:

    (a) 1, 2 and 4

    (b) 2 and 3

    (c) 1 and 3

    (d) 1 and 4 only

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Global Geological And Climatic Events

    In news: Arun River 

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Arun River, Isostatic Rebound

    Why in the News?

    The Arun River, which flows across Nepal and Tibet, is eroding rock and soil in its basin, leading to the rise of Mount Everest by up to 2 mm a year.

    How is Arun River making the Everest taller?

    The Arun River is contributing to the rise of Mount Everest through a process called isostatic rebound. Here’s how it works:

    1. River Incision:

    • The Arun River, which flows about 75 km from Mount Everest, is eroding large amounts of rock and soil from the surrounding landscape.
    • This process of erosion reduces the weight on the Earth’s crust in the Arun River basin.
    • A study by UCL suggests that the Arun River’s ability to carve out large amounts of rock and other materials may be due to it capturing another river or water system in Tibet.
    • This process is known as River Incision, where the river cuts downward into its bed, deepening its channel.
    • The erosion began to accelerate around 89,000 years ago when the Arun River merged with the Kosi River, removing large amounts of landmass and further reducing the weight on the region’s crust.

    2. Isostatic Rebound:

    • When the weight of the land (due to rocks, soil, or even ice) decreases, the Earth’s crust rises to balance the change.
    • This is similar to how a boat rises in water when heavy cargo is removed.
    • The removal of landmass in the Arun River basin allows the crust underneath Mount Everest to rise.

    About Arun River 

    • The Arun River originates in the Tibet Autonomous Region of China, where it is known as Phung Chu or Bum-chu in Tibetan.
    • It flows into Nepal and confluences with the Sun Koshi and Tamur River at Tribenighat, forming the Sapta Koshi River.
    • Tributaries:
      • Left tributaries: Yeru Tsanpo, Trakar-chu.
      • Right tributary: Barun River.
    • At the Nepal border, the Arun River is approximately 3,500 meters (11,500 ft) above sea level.
    • The river drains into the Koshi River, significantly contributing to the Sapta Koshi River system in Nepal.
    • It is the largest trans-Himalayan river in Nepal, playing a crucial role in supporting the region’s hydrology and ecosystems.
    • It provides around 37% of the total water in the Sapta Koshi system, following the Sun Koshi which contributes 44%.
    • Recently, the Arun-III Hydro Power Project (900 MW), which constructed with $6.95b Indian assistance, achieved a milestone with a tunnel breakthrough.

    PYQ:

    [2017] With reference to river Teesta, consider the following statements:

    1. The source of river Teesta is the same as that of Brahmaputra but it flows through Sikkim.

    2. River Rangeet originates in Sikkim and it is a tributary of river Teesta.

    3. River Teesta falls into Bay of Bengal at the border of India and Bangladesh.

    Which of the statements given above is/are correct?

    (a) 1 and 3 only

    (b) 2 only

    (c) 2 and 3 only

    (d) 1, 2 and 3

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Global Geological And Climatic Events

    Annular Solar Eclipse

    Prelims Only | Enviro & Biodiversity | Mains Paper 1: Salient Features Of World’S Physical Geography

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Physical Geography (Annular Solar Eclipse)

    Why in the News?

    An annular solar eclipse will be visible in parts of South America on October 2, 2023.  It, however, will not be visible from India.

    What is a Solar Eclipse?

    • A solar eclipse occurs when the Moon moves between the Earth and the Sun, blocking the Sun’s light either fully or partially, casting a shadow on certain parts of the Earth.
    • There are four types of solar eclipses:
      1. Total Solar Eclipse: When the Moon completely blocks the Sun, turning the sky dark. People in the path of a total solar eclipse can witness the Sun’s corona (its outer atmosphere), which is normally hidden by the bright sunlight.
      2. Annular Solar Eclipse: Occurs when the Moon is at or near its farthest point from Earth. The Moon does not fully cover the Sun, leaving a visible ring of fire around the Moon. This is what people in parts of South America will witness on October 2, 2023.
      3. Partial Solar Eclipse: Happens when the Moon blocks only a part of the Sun, giving it a crescent shape. During both partial and annular eclipses, areas outside the Moon’s umbra (the darkest part of its shadow) experience a partial eclipse. It is the most common type of solar eclipse.
      4. Hybrid Solar Eclipse: The rarest type, where the eclipse shifts between total and annular as the Moon’s shadow moves across the Earth. Some places see a total solar eclipse, while others see an annular one.

    Frequency of Solar Eclipses

    • A solar eclipse can only occur during the new moon, when the Moon and Sun are aligned on the same side of the Earth.
    • A new moon happens approximately every 29.5 days because that is the time it takes for the Moon to orbit the Earth.
    • However, solar eclipses don’t happen every month. They occur two to five times annually, but not every new moon results in an eclipse.
    • Why don’t they occur every month:
      • The Moon’s orbit around the Earth is tilted by about 5 degrees compared to the Earth’s orbit around the Sun.
      • This means the Moon’s shadow usually misses the Earth.
      • A solar eclipse only occur when the Moon crosses specific points in its orbit, called nodes, where the Moon’s orbit intersects the plane of Earth’s orbit around the Sun.
      • When a new moon occurs at one of these nodes, a solar eclipse is possible.

    PYQ:

    [2019] On 21st June, the Sun

    (a) does not set below the horizon at the Arctic Circle

    (b) does not set below the horizon at Antarctic Circle

    (c) shines vertically overhead at noon on the Equator

    (d) shines vertically overhead at the Tropic of Capricorn

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Festivals, Dances, Theatre, Literature, Art in News

    Dadasaheb Phalke Award

    Prelims Only | History | Mains Paper 1: Arts & Culture

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Dadasaheb Phalke Award

    Why in the News?

    Veteran actor Mithun Chakraborty will be conferred with the 2022 Dadasaheb Phalke Award.

    Mithun Chakraborty to Receive Dadasaheb Phalke Award 

    • Mithun Chakraborty has played a wide range of roles throughout his career, from a tribal in ‘Mrigayaa’ (1976) to an action hero and a dancing star, becoming one of the most versatile actors in Indian cinema.
    • His performance in ‘Disco Dancer’ (1982) made him an international sensation, with the movie being a massive hit across Asia, then Soviet Union, Eastern Europe, and other regions after Raj Kapoor.
    • He has worked in more than 350 films across multiple Indian languages, including Hindi, Bengali, Odia, Bhojpuri, Tamil, and Punjabi, demonstrating his wide-ranging influence.
    • Mithun has won three National Film Awards for his outstanding performances in films like ‘Mrigayaa’ (1976), ‘Tahader Katha’ (1992), and ‘Swami Vivekananda’ (1998).
    • He was awarded the Padma Bhushan, India’s third-highest civilian honor, in 2023, recognizing his contributions to the arts.
    • As the chairperson of the Film Studios Setting & Allied Mazdoor Union (FSSAMU) for three decades, Mithun has been actively involved in improving the welfare of film industry workers.

     

    About Dadasaheb Phalke Award

    Details
    Organized by
    • Directorate of Film Festivals, Ministry of Information and Broadcasting.
    • Presented by the President of India.
    First Presented 1969
    Purpose To honor individuals (filmmakers, actors, singers etc.) for their “great and outstanding contribution to the growth and development of Indian cinema”
    Named After
    • Dadasaheb (Dhundiraj Govind) Phalke, “Father of Indian Cinema”.
    • He directed and produced India’s first full-length feature film, Raja Harishchandra, in 1913.
    • This landmark film is considered the starting point of the Indian cinema.
    Notable Recipients Devika Rani (1969), Prithviraj Kapoor (1971), Satyajit Ray (1985), Raj Kapoor (1987), Lata Mangeshkar (1989), Asha Bhosle (2000), Yash Chopra (2001), Rajinikanth (2019), Amitabh Bachchan (2018) , Waheeda Rehman (2021).
    Components of the Award
    • ₹1,000,000 (US$12,000) cash prize;
    • Swarna Kamal (Golden Lotus) medallion, a shawl.
    Selection Criteria Awarded to individuals for their “great and outstanding contribution to the growth and development of Indian cinema”.
    Selection Committee A committee consisting of eminent personalities from the Indian film industry.

     

    PYQ:

    [2014] What do understand by the concept “freedom of speech and expression”? Does it cover hate speech also? Why do the films in India stand on a slightly different plane from other forms of expression? Discuss.

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Indian Army Updates

    [pib] Exercise KAZIND-2024

    Prelims Only | Security Issues | Mains Paper 3: Various Security Forces, Agencies & Their Mandates

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Exercise KAZIND

    Why in the News?

    The 8th edition of Exercise KAZIND-2024 has commenced in Uttarakhand.

    About Exercise KAZIND-2024

    • Exercise KAZIND is an annual joint military exercise between India and Kazakhstan.
    • It was first initiated as Exercise PRABAL DOSTYK in 2016 and later renamed Exercise KAZIND after the second edition.
    • The exercise involves Army contingents from both countries and, since 2023, also includes Air Force personnel, making it a Bi-service Exercise.
    • Focus Areas:
      • It focuses on Counter Terrorism operations in sub-conventional environments under the United Nations mandate.
      • Tactical drills practiced include Raid, Search and Destroy Operations, Small Team Insertion and Extraction, and Counter Unmanned Aerial System Operations.
    • Significance:
      • The exercise aims to develop skills, resilience, and coordination for joint military operations in semi-urban and urban environments.
      • It allows both countries to share best practices, enhance mutual cooperation, and strengthen military ties.

    PYQ:

    [2024] Which of the following statements about the Exercise Mitra Shakti-2023 is/ are correct?

    1. This was a joint military exercise between India and Bangladesh.
    2. It commenced in Aundh (Pune).
    3. Joint response during counter-terrorism operations was a goal of this operation.
    4. Indian Air Force was a part of this exercise.

    Select the answer using the code given below:

    (a) 1, 2 and 3

    (b) 1 and 4

    (c) 1 and 4

    (d) 2, 3 and 4

    Get an IAS/IPS ranker as your 1: 1 personal mentor

  • Citizenship and Related Issues

    Who is an Overseas Citizen of India (OCI)?

    Prelims Only | Polity | Mains Paper 2: Indian Constitution – historical underpinnings, evolution, features, amendments, significant provisions and basic structure

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Overseas Citizen of India (OCI)

    Why in the News?

    Following complaints from Overseas Citizen of India (OCI) card holders about being reclassified as “foreigners,” the Ministry of External Affairs clarified, that no changes have been made to the rules governing OCI status.

    About Overseas Citizen of India (OCI)

    Details
    About
    • OCI scheme, introduced in August 2005, allows Persons of Indian Origin (PIOs) who were citizens of India after January 26, 1950 or were eligible for Indian citizenship on that date, to register for OCI status.
    • Serves as a form of dual citizenship for the Indian diaspora.
    • The Ministry of Home Affairs defines an OCI.
    OCI Card Benefits OCI cardholders receive a multiple-entry, life-long visa to visit India and are exempt from registering with local authorities for extended stays.
    Population (as of 2023) USA: 16.8 lakh > UK: 9.34 lakh > Australia: 4.94 lakh> Canada: 4.18 lakh
    Recent Rules (2021 Notification)
    • OCI card holders need permission to visit protected, restricted, or prohibited areas.
    • Special permits are also required for activities such as conducting research, undertaking missionary or journalistic work, and visiting areas like Jammu & Kashmir.
    OCI vs NRI Rights Under the Foreign Exchange Management Act (FEMA) 2003, OCI card holders are now on par with foreign nationals regarding economic, financial, and educational rights, reversing earlier parity with NRIs.
    Significant Changes to OCI Rules
    • 2005: Lifelong visas and exemption from FRRO registration
    • 2007: Parity with NRIs for inter-country adoption and domestic airfare
    • 2009: Parity with NRIs for entry fees to monuments and professions like doctors and architects
    Eligibility Restrictions
    • Individuals with parents or grandparents from Pakistan or Bangladesh cannot apply for an OCI card.
    • Foreign military personnel (retired or active) are also not eligible.
    Spouse Eligibility Spouses of Indian citizens or OCI card holders, whose marriage has been registered for at least two years, can apply for an OCI card.
    OCI Card Restrictions
    • OCI card holders cannot vote, hold constitutional positions, or be elected as a members of Parliament or Legislative Assembly.
    • They are also restricted from holding government employment in India.

     

    PYQ:

    [2021] With reference to India, consider the following statements: (2021)

    1. There is only one citizenship and one domicile.
    2. A citizen by birth only can become the Head of State.
    3. A foreigner once granted citizenship cannot be deprived of it under any circumstances.

    Which of the statements given above is/are correct?

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

    Get an IAS/IPS ranker as your 1: 1 personal mentor

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

    Neutrino Fog

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Neutrino Fog

    Why in the News?

    The LUX-ZEPLIN (LZ) experiment revealed that as we continue to push the boundaries of dark matter detection, the issue of neutrino fog becomes increasingly significant.

    What is the LUX-ZEPLIN (LZ) Experiment?

    • The LUX-ZEPLIN (LZ) experiment is a cutting-edge dark matter detection project located deep underground at the Sanford Underground Research Facility in South Dakota, USA.
    • It is one of the most sensitive experiments in the world designed to detect dark matter particles, which are believed to make up about 85% of the matter in the universe but have not yet been directly observed.
    • The heart of the LZ experiment is a tank filled with 10 tonnes of liquid xenon, a very dense and pure material.
    • The idea is that if a dark matter particle collides with a xenon atom, it will produce a tiny burst of light and free electrons.
    • These interactions are then detected by sensitive equipment surrounding the xenon.
    • The experiment is located 1.5 km below the Earth’s surface.

    What is Neutrino Fog?

    • Neutrinos, often referred to as “ghost particles,” are subatomic particles with nearly zero mass and no electric charge. 
    • “Neutrino Fog” refers to the interference caused by neutrinos—subatomic particles that rarely interact with matter—in dark matter detection experiments.
    • Neutrinos are produced naturally in the Sun’s core, supernovae, and even Earth’s atmosphere.
    • Though they pass through most matter undetected, their weak interactions can cause small disturbances in highly sensitive detectors.
    • As dark matter detectors become larger and more sensitive, they are more likely to detect neutrinos, leading to a “fog” of signals that can obscure or mimic potential dark matter interactions.

    PYQ:

    [2015] In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news:

    1. It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice.

    2. It is a powerful telescope to search for dark matter

    3. It is buried deep in the ice.

    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 only

    Get an IAS/IPS ranker as your 1: 1 personal mentor