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Science Current Affairs Quiz - July 2019

Home > Current Affairs > Science Current Affairs Quiz - July 2019

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1. A rare snail species called ‘Scaly-Foot Snail’ (also known as Sea Pangolin) found at only three spots on Indian Ocean floor near Madagascar has become the 1st species to be officially declared threatened due to deep-sea mining.

  1. IUCN added over 7000 species to its endangered Red List, which now has over ___________ species listed as facing extinction. More than 500 deep-sea bony fish and molluscs have been added to list for 1st time.
None of These

2. A ‘smart agri copter’ has been developed by Researchers at Indian Institute of Technology (IIT) ____________________ to eliminate manual spraying of pesticides in agricultural fields, allowing spraying pesticides 10 times faster with 100% accuracy than manual spraying. It can carry 15 liters of pesticide, fitted with advanced multispectral imaging camera that helps to identify crop health by using imaging camera.

None of These

3. Indian Researchers at Aryabhatta Research Institute of Observational Sciences (ARIES) in Nainital (___________________) discovered 28 new variable stars in Milky Way galaxy, using 3.6-meter powerful Devasthal Optical Telescope (DOT). This is the first time variable stars have been found in NGC 4147, in the constellation of Coma Berenices.

  1. NASA’s Transiting Exoplanet Survey Satellite (TESS) discovered new dwarf star and planetary system named as TOI 270, located about 73 light years away from Earth, and in the constellation Pictor.
Himachal Pradesh
None of These

4. Indian Space Research Organisation launched Chandrayaan 2 from Satish Dhawan Space Center at Sriharikota (Andhra Pradesh), onboad GSLV MkIII-M1 Vehicle.

  • Geosynchronous Satellite Launch Vehicle GSLV MkIII-M1 successfully launched _______________ kg Chandrayaan-2 spacecraft into earth orbit. Spacecraft is revolving round earth with a perigee (nearest point to Earth) of 169.7 km and apogee (farthest point to Earth) of 45475 km.
  • Chandrayaan 2 will land at a place near South Pole of Moon, to carry out scientific experiments to explore the unexplored terriroty on Moon.
  • Now, several orbit manoeuvres will be carried out using Chandrayaan-2’s onboard propulsion system. This will raise spacecraft orbit in steps and then place it in Lunar Transfer Trajectory to enable spacecraft to travel to vicinity of Moon.
  • GSLV Mk III is a three-stage launch vehicle developed by ISRO. The vehicle has two solid strap-ons, a core liquid booster and a cryogenic upper stage. The vehicle is designed to carry 4 ton class of satellites into Geosynchronous Transfer Orbit (GTO) or about 10 tons to Low Earth Orbit (LEO).
  • Chandrayaan-2 is India's second mission to the moon. It comprises a fully indigenous Orbiter, Lander (Vikram) and Rover (Pragyan). The Rover Pragyan is housed inside Vikram lander.
  • After leaving earth orbit and on entering Moon's sphere of influence, the on-board propulsion system of Chandrayaan-2 will be fired to slow down spacecraft. This will enable it to be captured into a preliminary orbit around Moon. Later, orbit of Chandrayaan-2 around moon will be circularised at 100 km height from lunar surface.
  • Lander will separate from Orbiter and enter into a 100 km X 30 km orbit around Moon. Then, it will perform a series of complex braking manoeuvers to soft land in South polar region of Moon on September 7, 2019.
  • Rover will roll out from lander and carry out experiments on lunar surface for a period of 1 lunar day, which is equal to 14 Earth days. The mission life of lander is 1 lunar day. Orbiter will continue its mission for 1 year.
  • Orbiter ha a lift-off weight of about 2,369 kg, while lander and rover weighed 1,477 kg and 26 kg respectively. Rover can travel up to 500 m and relies on electric power generated by its solar panel for functioning.
  • Mission cost is approx 978 Crores INR.
  • ISRO will next launch its first solar mission Aditya-L1 in first half of 2020, as first dedicated scientific mission to study Sun’s corona. It aims to put Aditya-L1 satellite (800-kg) into a halo orbit around Lagrangian point L1 of Sun and Earth system. The L1 point is situated at a distance of about 1.5 million km from earth.
    1. Satellite will carry 7 payloads including the main payload Visible Emission Line Coronagraph (VELC). It will study dynamic nature of sun’s outer most layers, corona, and chromosphere and collect data about Coronal Mass Ejections (CME).

5. _____________ Aerospace Exploration Agency's asteroid-exploring unmanned spacecraft Hayabusa2 made second touchdown on Asteroid Ryugu, 300 mn km (185m miles) from Earth. Its for final sample collection which will could shed light on evolution of solar system.

  1. Hayabusa2 Mission was launched in December 2014, with project cost around $270 million. It is scheduled to return to Earth with its samples in 2020.
None of These

6. Reseachers from University of Glasgow (__________________) captured photo of a strong form of quantum entanglement called Bell entanglement, as visual evidence of an elusive phenomenon which Albert Einstein once called “spooky action at a distance”.

  1. Photo points out two photons interacting and sharing physical states for a brief instant – an event that occurs regardless of the actual distance between particles.
None of These

7. Researchers at _______________ Nuclear Research Centre discovered a new way of predicting the monsoon two months in advance, by measuring how much Beryllium-7 (Be-7, an isotope of Beryllium) is present in the air. With this, Indian monsoon can be predicted 52 days in advance with a margin of error of three days.

None of These

8. Researchers discovered Dracaena cambodiana, a dragon tree species in Dongka Sarpo area of West Karbi Anglong District in ________________. This is 1st time a dragon tree species has been reported from India, which yields dragon’s blood- a bright red resin. The plant resin is used since ancient times as medicine, varnish, body oil, incense and dye.

None of These

9. Researchers from Indian Institute of Science (IISc) _______________ discovered Proahaetulla antiqua, a new vine snake species. This is an ancient species which is endemic to southern Western Ghats is thought to have evolved around 26 million years ago during mid-Oligocene. Vine Snakes get their names due to their slender bodies and vine-like appearances.

None of These

10. Researchers from Indian Institute of Technology (IIT) _____________________ developed a Dye-Sensitised Solar Cell (DSSC) which is based on New Fuchsin (NF) dye with aqueous electrolyte and platinum-free counter electrodes.

  1. Currently, most familiar solar cells today are made up of Silicon (Si) and can be seen in various overhead panels and other places. However, this technology is limited by huge fabrication costs as Si processing is very expensive and involves very high temperature methods that leave a large carbon footprint.
  2. To get around limitations of using Si, IIT Hyderabad team started working on solar cells based on organic materials for photovoltaic technology, which were supposedly inexpensive and easy to fabricate.
  3. New Fuchsin is an inexpensive dye available off-shelf in most supermarkets in India, and in its purest form costs $2 per gramme.
None of These

11. Researchers from Tata Institute of Fundamental Research (TIFR) ________________ have developed a new material called ‘black gold’, by rearranging size and gaps of gold nanoparticles to develop new material that can absorb light and carbon dioxide. It can be used for applications that range from harvesting solar energy to desalinating seawater.

None of These

12. Researchers from Technion - _______________ Institute of Technology have created an algorithm rather than a machine called Ramanujan Machine to honor prominent Indian mathematician Srinivasa Ramanujan. Machine attempts to automatically generate conjectures in the form of mathematical formulas that we can analyze, and hopefully, prove to be true mathematically.

  1. Conjectures are a major step in the process of making new discoveries in any branch of science, particularly mathematics.
  2. Typically, people provide the input and the algorithm finds the solution. The Ramanujan Machine reverses the process. So if a constant such as π is fed into the machine, it will generate a series whose value would lead towards π (pi).
  3. Shr. Ramanujan was born in 1887 in Chennai. He independently compiled almost 3,900 identities and equations.
None of These

13. Scientists from University of Queensland in ___________________ and a team of Indian researchers led by R Thara discovered a new gene directly linked to schizophrenia. They identified a gene called NAPRT1 which encodes an enzyme involved in vitamin B3 metabolism. Schizophrenia is a chronic and severe mental disorder that affects how a person thinks, feels, and behaves.


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