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Type: Prelims Only

  • Cyber Security – CERTs, Policy, etc

    Back in news: Pegasus Spyware

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Pegasus

    Mains level: Whatsapp snooping

    Telephone numbers of some noted Indian journalists were successfully snooped upon by an unidentified agency using Pegasus software.

    Pegasus Spyware

    • All spyware do what the name suggests — they spy on people through their phones.
    • Pegasus works by sending an exploit link, and if the target user clicks on the link, the malware or the code that allows the surveillance is installed on the user’s phone.
    • A presumably newer version of the malware does not even require a target user to click a link.
    • Once Pegasus is installed, the attacker has complete access to the target user’s phone.
    • The first reports on Pegasus’s spyware operations emerged in 2016, when Ahmed Mansoor, a human rights activist in the UAE, was targeted with an SMS link on his iPhone 6.

    What is the new threat?

    • Pegasus has evolved from its earlier spear-phishing methods using text links or messages to ‘zero-click’ attacks which do not require any action from the phone’s user.
    • This had made what was without a doubt the most powerful spyware out there, more potent and almost impossible to detect or stop.

    How do zero-click attacks work?

    • A zero-click attack helps spyware like Pegasus gain control over a device without human interaction or human error.
    • Zero-click attacks are hard to detect given their nature and hence even harder to prevent.
    • Detection becomes even harder in encrypted environments where there is no visibility on the data packets being sent or received.
    • Most of these attacks exploit software that receive data even before it can determine whether what is coming in is trustworthy or not, like an email client.

    Answer this PYQ from CSP 2018:

    Q.The terms ‘WannaCry, Petya, Eternal Blue’ sometimes mentioned news recently are related to

    (a) Exoplanets

    (b) Crypto currency

    (c) Cyber attacks

    (d) Mini satellites

  • Modern Indian History-Events and Personalities

    When were Tilak and Gandhi tried under the Sedition Law?

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Sedition in colonial times

    Mains level: Not Much

    Recently, Chief Justice of India N V Ramana observed that the “colonial law” was used by the British to silence Mahatma Gandhi and Bal Gangadhar Tilak.

    Must read:

    Sedition Law and its discontents

    Use of sedition law through history

    • According to the LOC blog, the first known instance of the application of the law was the trial of newspaper editor Jogendra Chandra Bose in 1891.
    • Other prominent examples of the application of the law include the trials of Tilak and Gandhi.
    • Apart from this, Jawaharlal Nehru, Abul Kalam Azad and Vinayak Damodar Savarkar were also charged with sedition.

    When was sedition law used against Gandhi and Tilak?

    • In 1922, Gandhi was arrested on charges of sedition in Bombay for taking part in protests against the colonial government.
    • He was sentenced to six years in prison but was released after two years because of medical reasons.
    • Before Gandhi, Tilak faced three trials in cases related to sedition and was imprisoned twice.
    • He was charged with sedition in 1897 for writing an article in his weekly publication called Kesari and was sentenced to 12 months imprisonment.
    • He has tried again in 1908 and was represented by MA Jinnah. But his application for bail was rejected and he was sentenced to six years.
    • The second time he was tried was also because of his writings, one of which referred to the murder of European women in Muzzafarpur when bombs were thrown by Bengali revolutionaries.
    • Interestingly, the judge who announced Tilak’s sentence in the second trial, Justice DD Davar, had represented him in his first trial in 1897.
  • Climate Change Impact on India and World – International Reports, Key Observations, etc.

    Why the Amazon forests are no longer acting as a carbon sink

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Amazon forests

    Mains level: Climate Change

    The Amazon forests in South America, which are the largest tropical forests in the world, have started emitting carbon dioxide (CO2) instead of absorbing carbon emissions.

    Note the countries bordered by the Amazon forests.

    Amazon forests

    • The Amazon rainforest is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America.
    • This basin encompasses 7,000,000 sq km of which 5,500,000 sq km are covered by the rainforest.
    • The majority of the forest is contained within Brazil, with 60% of the rainforest, followed by Peru with 13%, Colombia with 10%, and with minor amounts in Bolivia, Ecuador, French Guiana, Guyana, Suriname, and Venezuela.
    • It represents over half of the planet’s remaining rainforests and comprises the largest and most biodiverse tract of tropical rainforest in the world.

    Why in news?

    • A significant amount of deforestation in eastern and southeastern Brazil has turned the forest into a source of CO2 that has the ability to warm the planet.
    • Not only the Amazon rainforests, some forests in Southeast Asia have also turned into carbon sources in the last few years as a result of the formation of plantations and fires.

    What have the researchers found?

    • Over the years as fossil-fuel emissions across the world have increased, the Amazon forests have absorbed CO2 from the atmosphere, helping to moderate the global climate.
    • But researchers are not saying that because of significant levels of deforestation (over the course of 40 years) there has been a long-term decrease in rainfall and increase in temperatures during the dry season.
    • Because of these reasons the eastern Amazon forests are no longer carbon sinks, whereas the more intact and wetter forests in the central and western parts are neither carbon sinks nor are they emitters.
    • Another reason for the eastern region not being able to absorb as much CO2 as it did previously is the conversion of forests into agricultural land.
  • Innovations in Sciences, IT, Computers, Robotics and Nanotechnology

    What are Doppler Radars?

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Doppler Radar

    Mains level: Not Much

    The India Meteorological Department’s (IMD) Doppler Radar in Mumbai, which surveys weather patterns and forecasts, stopped working after heavy rainfalls.

    How does a Doppler radar work?

    • In radars, a beam of energy– called radio waves– is emitted from an antenna.
    • When this beam strikes an object in the atmosphere, the energy scatters in all directions, with some reflecting directly back to the radar.
    • The larger the object deflecting the beam, the greater is the amount of energy that the radar receives in return.
    • Observing the time required for the beam to be transmitted and returned to the radar allows weather forecasting departments to “see” raindrops in the atmosphere, and measure their distance from the radar.

    What makes a Doppler radar special?

    • It can provide information on both the position of targets as well as their movement.
    • It does this by tracking the ‘phase’ of transmitted radio wave pulses; phase meaning the shape, position, and form of those pulses.
    • As computers measure the shift in phase between the original pulse and the received echo, the movement of raindrops can be calculated.
    • Thus it is possible to tell whether the precipitation is moving toward or away from the radar.

    Types of Doppler radar

    • In India, Doppler radars of varying frequencies — S-band, C-band and X-band — are commonly used.
    • They help track the movement of weather systems and cloud bands and gauge rainfall over its coverage area of about 500 km.
    • The radars guide meteorologists, particularly in times of extreme weather events like cyclones and associated heavy rainfall.
    • An X-band radar is used to detect thunderstorms and lightning whereas C-band guides in cyclone tracking.

    Why are they called ‘Doppler’ radars?

    • The phase shift in these radars works on the same lines as the “Doppler effect” observed in sound waves.
    • It tells that the sound pitch of an object approaching the observer is higher due to the compression of sound waves (a change in their phase).
    • As this object moves away from the observer, the sound waves stretch, resulting in lower frequency.
    • This effect explains why an approaching train’s whistle sounds louder than the whistle when the train moves away.
    • The discovery of the phenomenon is attributed to Christian Doppler, a 19th-century Austrian physicist.
  • Civil Services Reforms

    Dismissal of govt employees: What the Constitution says

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Article 311

    Mains level: Civil services reforms

    Lt Governor has dismissed 11 Jammu and Kashmir government employees for alleged terror links under provisions of Article 311(2)(c) of the Constitution.

    What is Article 311?

    • Article 311 of the Constitution deals with ‘Dismissal, removal or reduction in rank of persons employed in civil capacities under the Union or a State’.
    • Under Article 311(2), no civil servant can be “dismissed or removed or reduced in rank except after an inquiry in which he has been informed of the charges and given a reasonable opportunity of being heard in respect of those charges’’.
    • Subsection (c) of the provision, however, says this clause shall not apply “where the President or the Governor, as the case may be, is satisfied that in the interest of the security of the State it is not expedient to hold such inquiry”.

    Remedy available

    • The only available remedy to a terminated employee is to challenge the government’s decision in the High Court.
  • Digital India Initiatives

    Bhutan becomes first neighbor to use BHIM UPI

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: BHIM, UPI, IMPS

    Mains level: Mobile banking facilities in India

    Bhutan becomes the first country, in India’s immediate neighbourhood, to use the BHIM app for mobile-based payments and “to adopt UPI standards for its QR deployment”.

    Bharat Interface for Money (BHIM)

    • BHIM is an Indian mobile payment App developed by the National Payments Corporation of India (NPCI), based on the Unified Payments Interface (UPI).
    • Named after B. R. Ambedkar and launched on 30 December 2016 it is intended to facilitate e-payments directly through banks and encourage cashless transactions.
    • The application supports all Indian banks which use UPI, which is built over the Immediate Payment Service (IMPS) infrastructure and allows the user to instantly transfer money between bank accounts of any two parties.
    • It can be used on all mobile devices.

    Note: Bhutan has become the first country to adopt India’s Unified Payment Interface (UPI) standards for its quick response (QR) code. It is also the second country after Singapore to have BHIM-UPI acceptance at merchant locations, NPCI International Payments Ltd (NIPL).

    What is UPI?

    • Unified Payments Interface (UPI) is an instant real-time payment system developed by NPCI facilitating inter-bank transactions.
    • The interface is regulated by the Reserve Bank of India and works by instantly transferring funds between two bank accounts on a mobile platform.

    Answer this PYQ in the comment box:

    Q. With reference to digital payments, consider the following statements:

    1. BHIM app allows the user to transfer money to anyone with a UPI-enabled bank account.
    2. While a chip-pin debit card has four factors of authentication, BHIM app has only two factors of authentication.

    Which of the statements given above is/ are correct? (CSP 2018)

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2


    You can use our popular TIKDAM Technique to solve such tricky questions:

    Tikdam Technique – How our Prime Test Series 2020 gives you an edge

  • Zoonotic Diseases: Medical Sciences Involved & Preventive Measures

    What is UV-C technology?

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: UV technology for disinfection

    Mains level: Not Much

    The Union Ministry for Science and Technology has informed that Ultraviolet-C or UV-C Disinfection Technology will soon be installed in Parliament for the mitigation of airborne transmission of SARS-COV-2.

    UV-C air duct disinfection system

    • The UV-C air duct disinfection system was developed by CSIR-CSIO (Central Scientific Instruments Organisation).
    • The system is designed to fit into any existing air-ducts and the virucidal dosages using UV-C intensity and residence time can be optimized according to the existing space.
    • The release adds that the virus is deactivated in any aerosol particles by the calibrated levels of UV-C light. It can be used in auditoriums, malls, educational Institutions, AC buses, and railways.

    What is Ultraviolet (UV)?

    • Ultraviolet (UV) is a type of light or radiation naturally emitted by the Sun. It covers a wavelength range of 100-400 nm. The human visible light ranges from 380–700 nm.
    • UV is divided into three bands: UV-C (100-280 nm), UV-B (280-315 nm) and UV-A (315-400 nm).
    • UV-A and UV-B rays from the Sun are transmitted through our atmosphere and all UV-C is filtered by the ozone layer.
    • UV-B rays can only reach the outer layer of our skin or epidermis and can cause sunburns and are also associated with skin cancer.
    • UV-A rays can penetrate the middle layer of your skin or the dermis and can cause ageing of skin cells and indirect damage to cells’ DNA.
    • UV-C radiation from man-made sources has been known to cause skin burns and eye injuries.

    So, can UV-C kill coronavirus?

    • UV-C radiation (wavelength around 254 nm) has been used for decades to disinfect the air in hospitals, laboratories, and also in water treatment.
    • But these conventional germicidal treatments are done in unoccupied rooms as they can cause health problems.
    • It can destroy the outer protein coating of the SARS-Coronavirus.

    Is it safe for humans?

    • The device is specifically developed to disinfect non-living things.
    • UV-C radiation used in this device could be harmful to the skin and eyes of living beings.

    Answer this PYQ in the comment box:

    Q.What is the role of ultraviolet (UV) radiation in the water purification systems?

    1. It inactivates/kills the harmful microorganisms in water.
    2. It removes all the undesirable odours from the water.
    3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.

    Which of the statements given above is/are correct? (CSP 2010)

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

  • Monsoon Updates

    What is lightning, and how does it strike?

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Lightening and Thunderstorms

    Mains level: Not Much

    With the monsoon making a slow revival over several parts of India, except the northwest region, there is a rise in lightning-linked deaths.

    What is lightning?

    • Lightning is a very rapid — and massive — discharge of electricity in the atmosphere, some of which is directed towards the Earth’s surface.
    • These discharges are generated in giant moisture-bearing clouds that are 10-12 km tall.
    • The base of these clouds typically lies within 1-2 km of the Earth’s surface, while their top is 12-13 km away.
    • Temperatures towards the top of these clouds are in the range of minus 35 to minus 45 degrees Celsius.

    How does it strike?

    • As water vapour moves upward in the cloud, the falling temperature causes it to condense.
    • Heat is generated in the process, which pushes the molecules of water further up.
    • As they move to temperatures below zero degrees Celsius, the water droplets change into small ice crystals. They continue to move up, gathering mass — until they are so heavy that they start to fall to Earth.
    • This leads to a system in which, simultaneously, smaller ice crystals are moving up and bigger crystals are coming down.
    • Collisions follow and trigger the release of electrons — a process that is very similar to the generation of sparks of electricity.
    • As the moving free electrons cause more collisions and more electrons, a chain reaction ensues.
    • This process results in a situation in which the top layer of the cloud gets positively charged, while the middle layer is negatively charged.

    Making of the thunder

    • The electrical potential difference between the two layers is huge — of the order of a billion to 10 billion volts.
    • In very little time, a massive current, of the order of 100,000 to a million amperes, starts to flow between the layers.
    • An enormous amount of heat is produced, and this leads to the heating of the air column between the two layers of the cloud.
    • This heat gives the air column a reddish appearance during lightning. As the heated air column expands, it produces shock waves that result in thunder.

    How does this current reach the Earth from the cloud?

    • While the Earth is a good conductor of electricity, it is electrically neutral.
    • However, in comparison to the middle layer of the cloud, it becomes positively charged.
    • As a result, about 15%-20% of the current gets directed towards the Earth as well.
    • It is this flow of current that results in damage to life and property on Earth.
    • There is a greater probability of lightning striking tall objects such as trees, towers or buildings.
    • Once it is about 80-100 m from the surface, lightning tends to change course towards these taller objects.
    • This happens because air is a poor conductor of electricity, and electrons that are travelling through air seek both a better conductor and the shortest route to the relatively positively charged Earth’s surface.

    What precautions should be taken against lightning?

    • Lightning rarely hits people directly — but such strikes are almost always fatal.
    • People are most commonly struck by what are called “ground currents”.
    • The electrical energy, after hitting a large object (such as a tree) on Earth, spreads laterally on the ground for some distance, and people in this area receive electrical shocks.
    • It becomes more dangerous if the ground is wet (which it frequently is because of the accompanying rain), or if there is metal or other conducting material on it.
    • Water is a conductor, and many people are struck by lightning while standing in flooded paddy fields.
    • For the reasons given above, taking shelter under a tree is dangerous. Lying flat on the ground too can increase risks.
    • People should move indoors in a storm; however, even indoors, they should avoid touching electrical fittings, wires, metal, and water.

    Answer this PYQ in the comment box:

    Q.During a thunderstorm, the thunder in the skies is produced by the:

    1. meeting of cumulonimbus clouds in the sky
    2. lightning that separates the nimbus clouds
    3. violent upward movement of air and water particles

    Select the correct option using the codes given below (CSP 2011):

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) None of the above

  • Blockchain Technology: Prospects and Challenges

    What is a Bitcoin Hardware Wallet and how it works?

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Cryptocurrencies

    Mains level: Issues with Cryptocurrencies

    Last week, Twitter CEO announced his payments firm Square would soon build a hardware wallet to store bitcoin.

    Bitcoin Hardware Wallet

    • The wallet will be a type of plug-in device, much like a USB pen drive that stores, manages and secures a user’s crypto assets.
    • Each digital asset is linked to a cryptographic password called a ‘private key’ to allow users to access it.
    • This key safeguards cryptocurrencies from theft and unauthorized access.
    • The asset owner, with the help of a secure hardware wallet, can access the private key to buy and sell crypto assets from anywhere.
    • Most hardware wallets allow users to manage multiple accounts; some even allow users to connect to their Google or Facebook accounts.
    • Popular hardware wallets include Trezor, Ledger, KeepKey and Prokey.

    How is it different from a software wallet?

    • Cryptocurrency keys can be stored in two kinds of wallets – software and hardware.
    • Software wallets are like smartphone apps that digitally store private keys.
    • Most software wallets don’t charge users to store private keys but may collect a commission for trading via the app.
    • These wallets can be vulnerable to malware.
    • Hardware wallets and physical devices act like cold storage for confidential keys. The passwords are protected by a PIN, making it difficult for hackers to extract private keys as the information is not exposed to the Internet.

    The upsides of a hardware wallet

    • Hardware wallets are said to be convenient as they can be connected to trading exchanges to complete transactions.
    • Hardware wallets are often stored in a protected microcontroller and cannot be transferred out of the device, making them secure.
    • Their isolation from the Internet also mitigates the risk of the assets being compromised. Moreover, it does not rely on any third-party app.

    Limitations

    • Since the wallet is in physical form, the device could be stolen or destroyed.
    • They could be used by malicious actors to steal confidential data.
    • The device can also be expensive as compared to software wallets.
    • Some hardware wallets can also have complex features, making it difficult for first-timers to understand.

    Answer this PYQ in the comment box:

    Q.With reference to “Blockchain Technology”, consider the following statements:

    1. It is a public ledger that everyone can inspect but which no single user controls.
    2. The structure and design of block chain is such that all the data in it are about crypto currency only.
    3. Applications that depend on basic features of blockchain can be developed without anybody’s permission.

    Which of the statement given above is/are correct?

    (a) 1 only

    (b) 2 only

    (b) 1 and 2 only

    (d) 1 and 3


    Back2Basics: Cryptocurrencies

    • A cryptocurrency is a digital asset designed to work as a medium of exchange wherein individual coin ownership records are stored in a ledger existing in a form of a computerized database.
    • It uses strong cryptography to secure transaction records, control the creation of additional coins, and verify the transfer of coin ownership.
    • It typically does not exist in physical form (like paper money) and is typically not issued by a central authority.
    • Cryptocurrencies typically use decentralized control as opposed to centralized digital currency and central banking systems.
  • RBI Notifications

    Retail Direct Scheme for G-Secs

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: G-Secs

    Mains level: Not Much

    The RBI has announced a scheme under which retail investors will be allowed to open retail direct gilt accounts (RDG) directly with the central bank.

    Retail Direct Scheme

    • The scheme is a one-stop solution to facilitate investment in government securities (G-secs) by individual investors.
    • Under RDG schemes, accounts can be opened through a dedicated online portal, which will provide registered users access to primary issuance of government securities and to NDS-OM.

    What is a gilt account?

    • A “Gilt Account” means an account opened and maintained for holding Government securities, by an entity or a person including ‘a person resident outside India’ with a “Custodian” permitted by the RBI.

    About Government Securities

    • These are debt instruments issued by the government to borrow money.
    • The two key categories are:
    1. Treasury bills (T-Bills) – short-term instruments which mature in 91 days, 182 days, or 364 days, and
    2. Dated securities – long-term instruments, which mature anywhere between 5 years and 40 years

    Note: T-Bills are issued only by the central government, and the interest on them is determined by market forces.

    Why G-Secs?

    • Like bank fixed deposits, g-secs are not tax-free.
    • They are generally considered the safest form of investment because they are backed by the government. So, the risk of default is almost nil.
    • However, they are not completely risk-free, since they are subject to fluctuations in interest rates.
    • Bank fixed deposits, on the other hand, are guaranteed only to the extent of Rs 5 lakh by the Deposit Insurance and Credit Guarantee Corporation (DICGC).

    Retail investors and G-Secs

    • Small investors can invest indirectly in g-secs by buying mutual funds or through certain policies issued by life insurance firms.
    • To encourage direct investment, the government and RBI have taken several steps in recent years.
    • Retail investors are allowed to place non-competitive bids in auctions of government bonds through their Demat accounts.
    • Stock exchanges act as aggregators and facilitators of retail bids.