Prelims Exam
Short Notes
Science and Tech.
1. ISRO’s Achievement in Minimizing Orbital Debris
Space Debris Explained
- Inoperative man-made objects in Earth orbit.
- Kessler Syndrome: Cascading collisions creating more debris, hindering space use.
International Agreements
- Space Liability Convention (1972): Defines liability for damage from space objects.
- No law against debris re-entering Earth’s atmosphere.
ISRO’s Mission
- PSLV-C58/XPoSat mission (Jan 2024) left minimal debris.
- Achieved by transforming the used stage into a stabilized platform (POEM-3).
- POEM-3 deorbited for early re-entry into Earth’s atmosphere.
Significance
- Minimizes orbital debris and potential collisions.
- POEM-3 offers a cost-effective platform for space experiments.
Project NETRA
- ISRO’s early warning system for detecting space hazards.
- Aims to provide India with its own Space Situational Awareness (SSA) capability.
- SSA helps predict threats to Indian satellites from space debris.
Defence
2. Angara Rocket (GS3/Science and Technology)
- Russia successfully test-launched its Angara-A5 space rocket.
- Features:
- 3-stage rocket, 42.7 meters tall, weighing 773 tonnes.
- Carrying capacity: 24.5 tonnes to space.
- Purpose: Successor to Proton M as Russia’s heavy-lift rocket.
- Background:
- Developed after the Soviet Union’s collapse to ensure space access independent of Kazakhstan’s Baikonur Cosmodrome.
- First test flight in 2014, followed by another in 2020 (both from Plesetsk, northern Russia).
- Partial test failure in 2021.
Environment
3. Sustainable Hydrogel for Microplastics Removal
- IISc researchers design a sustainable hydrogel to remove microplastics from water.
- Features:
- Unique intertwined polymer network for binding and degrading contaminants using UV light irradiation.
- Three polymer layers (chitosan, polyvinyl alcohol, polyaniline) forming an interpenetrating polymer network (IPN).
- Nanoclusters of copper substitute polyoxometalate (Cu-POM) for UV-light-induced degradation.
- Efficiency: Removes about 95% and 93% of two different microplastics in near-neutral pH water.
Microplastics (Background)
- Tiny plastic pieces less than 5 millimeters long, harmful to oceans and aquatic life.
- Threat to human health – enter bodies through water, increasing illness risk.
- Environmental hazard – found in remote areas like polar ice caps and deep ocean trenches, endangering ecosystems.
4. Water Rationing in Bogota
- Bogota, Colombia’s capital city, implements water rationing due to scarcity.
- Water Rationing: Limiting everyday water use during resource shortage.
- Bogota:
- Sprawling, high-altitude capital of Colombia.
- Located on the Andean plateau known as Altiplano Cundiboyacense.
Health
5. Whooping Cough
- Highly contagious respiratory illness (pertussis) caused by Bordetella pertussis bacteria.
- Named for the “whooping” sound during coughing fits.
- Particularly severe in infants, with complications like pneumonia and even death.
- Spread: Through droplets from coughs or sneezes of infected people.
- Symptoms: Begin with cold-like symptoms and low-grade fever. Progress to severe coughing with a “whooping” sound, leading to vomiting.
- Vaccination: DTaP and Tdap vaccines protect children against whooping cough.
Geography
6. Volcanic Vortex Rings
Mount Etna erupting near-perfect rings of smoke called “volcanic vortex rings.”
- Formation: Rapid gas (mainly water vapor) release through a circular vent in the crater.
- Similar to smoke rings blown by humans.
- First observed at Mount Etna and Vesuvius (Italy) in 1724.
- Significance: Provides insights into volcanic activity and gas emissions (helps predict eruptions).
About Mount Etna
- Active volcano on Sicily’s east coast (Mediterranean’s largest island).
- Europe’s tallest volcano south of the Alps and one of the most active.
- Five summit craters responsible for most eruptions.
- Additional “flank” eruptions from vents on the mountain’s slopes.
- Almost constant activity with over 60 flank eruptions and many more summit eruptions since 1600.
- UNESCO World Heritage Site since 2013.
Polity
7. Corrupt Practices under Representation of the People Act, 1951 (RPA)
- Section 123: Includes bribery, undue influence, false information, promotion of enmity/hatred for electoral gain.
- Section 123(2): Undue influence – interferences with free exercise of electoral rights (threats, social ostracism, caste/community expulsion).
- Section 100(1)(b): Election can be declared void if a returned candidate or their agent commits corrupt practices.
- Sections 100(1)(d)(i) & (iv): Election results can be declared materially affected if there’s improper acceptance of nomination or non-compliance with relevant provisions.
8. Declaration of Movable Assets
- Supreme Court judgement clarifies declaration of movable assets by election candidates.
- Key takeaway: Not mandatory to declare every item (clothes, furniture, etc.) unless it’s a sizable asset or reflects lifestyle relevant to the candidacy.
- Voters don’t have an absolute right to all details of a candidate’s private life.