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Practice high-yield UPSC Prelims General Science PYQs (2013–2026). Interactive drill with instant explanations covering biology, biotechnology, physics & chemistry.
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Category: General Science
[UPSC CSE 2026]Which of the following statements with regard to the National Quantum Mission (NQM) is/are correct?1. It aims at developing intermediate-scale quantum computers with 50-1000 physical qubits.2. Its implementation includes setting up of four Thematic Hubs (T-Hubs) in academic and national R&D institutes across India.
Select the answer using the code given below:
• Quantum Scale Objectives: The mission aims to develop intermediate-scale quantum computers with 50–1000 physical qubits within an 8-year timeframe using superconducting and photonic platforms.• Thematic Hubs: Four dedicated Thematic Hubs (T-Hubs) are being established across premier national research institutions covering Quantum Computing, Quantum Communication, Quantum Sensing & Metrology, and Quantum Materials & Devices.
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[UPSC CSE 2026]Consider the following statements with regard to GenomeIndia Project:1. It is a part of the Human Genome Project.2. The project is funded by the Department of Biotechnology (DBT), Government of India.3. Its primary aim is to build a catalogue of genetic diversity of the Indian population.
Which of the statements given above is/are correct?
• Statement 1 is incorrect: GenomeIndia is an independent indigenous project; it is not part of the international Human Genome Project which concluded in 2003.• Statements 2 and 3 are correct: It is funded by the Department of Biotechnology (DBT) and executed with IISc, aiming to sequence 10,000 genomes to catalogue Indian genetic diversity.
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[UPSC CSE 2026]Which of the following statements with regard to drone swarms is/are correct?1. They use Terahertz band of frequency to communicate with the command centre.2. Individual drones in the swarm can communicate with other drones in the swarm.3. GPS Spoofing is a commonly used technique to counter drone swarm attack.
• Statement 1 is incorrect: Drone swarms use standard tactical RF bands (UHF/VHF/ISM); Terahertz frequencies are not used in practical swarm operations.• Statements 2 and 3 are correct: Drones communicate peer-to-peer within the swarm for decentralized coordination, and GPS spoofing is a common counter-drone attack technique.
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[UPSC CSE 2026]Which of the following statements with regard to involvement of private entities in India’s space programme:1. The Indian National Space Promotion and Authorisation Centre (IN-SPACe) is an autonomous agency formed to facilitate participation of private entities.2. Agnikul Cosmos launched the world’s first flight using 3D-printed rocket engine.3. Skyroot Aerospace has developed liquid fuel for GSLV.
• Statements 1 and 2 are correct: IN-SPACe is the autonomous nodal body to facilitate private space entities, and Agnikul Cosmos launched Agnibaan SOrTeD using a single-piece 3D-printed engine.• Statement 3 is incorrect: Skyroot built the solid-propulsion Vikram-S rocket; GSLV fuel systems are built by ISRO.
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[UPSC CSE 2026]Which of the following statements with regard to Green Hydrogen is/are correct?1. It is decarbonized hydrogen obtained from natural gas reforming combined with carbon capture and storage (CCS).2. It is produced using electrolysis of water with electricity generated by renewable energy.3. National Green Hydrogen Mission of India aims for abatement of nearly 50 MMT of annual greenhouse gas emissions by 2030.
• Statement 1 is incorrect: Natural gas reforming with CCS produces Blue Hydrogen, not Green.• Statements 2 and 3 are correct: Green hydrogen is produced via electrolysis powered entirely by renewable energy, with a mission target to abate nearly 50 MMT of annual GHG emissions by 2030.
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[UPSC CSE 2026]Which of the following statements with regard to stealth technology is/are correct?1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material.2. Stealth objects can be detected using specific frequencies.3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation.
• Statements 1 and 2 are correct: Stealth relies on low radar cross-section (RCS) and Radar Absorbing Materials (RAM), and lower frequency radars can detect them.• Statement 3 is incorrect: Metamaterials are used to absorb or deflect signals away, not to increase scattering towards radar systems.
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[UPSC CSE 2026]Which of the following statements with regard to Large Language Models (LLMs) used in machine learning is/are correct?1. LLMs assign probabilities to the next possible words and then pick the one with the highest probability.2. LLMs process data through mathematical optimization to minimise prediction errors.3. LLMs produce unbiased outputs.
• Statements 1 and 2 are correct: Autoregressive language models assign probability distributions to predict subsequent tokens, and training uses mathematical optimization (gradient descent) to minimize cross-entropy loss.• Statement 3 is incorrect: LLMs inherit and reflect biases present in their web training data, so their outputs are not inherently unbiased.
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[UPSC CSE 2026]Which of the following statements with regard to genetic medicine is/are correct?1. Genetic medicines correct/compensate for the faulty genes responsible for disease.2. Engineered viruses and lipid nanoparticles are used as carriers of the genetic medicine.3. Genetic medicines alter the entire DNA sequence.
• Statements 1 and 2 are correct: Genetic medicines compensate for faulty genes and use engineered viruses or lipid nanoparticles (LNPs) as delivery carriers.• Statement 3 is incorrect: Genetic therapies do not alter the entire genomic DNA sequence.
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[UPSC CSE 2026]Which of the following statements regarding the features of blockchain technology are correct?1. Records stored in the database may be made visible to relevant stakeholders without risk of alteration.2. Copies of the entire database are stored on multiple computers on a network, syncing within seconds.3. Consortium blockchain is a blend of public and private blockchains allowing selective data access.4. Mathematical algorithms make it impossible to change or delete any data once recorded and accepted.
• Transparency & Tamper-Proofing: Records stored on a blockchain remain accessible to designated network participants while cryptography and consensus mechanisms eliminate the risk of unauthorized alteration.• Distributed Node Synchronization: Every participating computer (node) maintains a replicated copy of the entire ledger, synchronizing data across the network in real time.• Cryptographic Immutability: Each block carries a cryptographic hash linking it to previous entries, making accepted data mathematically impossible to forge or delete without corrupting the entire chain.• Note: A blend of public and private ledgers is termed a hybrid blockchain; a consortium blockchain is governed by a predetermined group of organizations.
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[UPSC CSE 2026]Which of the following statements about DHRUV64 is/are correct?1. It is the third chip fabricated under the DIR-V Programme with an overall aim to enable the creation of microprocessors for India.2. It is India’s first homegrown 1.0 GHz, 64-bit dual-core microprocessor.
• DIR-V Initiative: DHRUV64 is the third major chip taped out under the Digital India RISC-V (DIR-V) Programme, conceptualized to achieve silicon and microprocessor self-reliance in India.• Architecture & Specifications: It is officially recognized as India’s first homegrown 1.0 GHz, 64-bit dual-core microprocessor designed by the SHAKTI processor team at IIT Madras.• Applications: Built for commercial embedded devices, IoT hardware, and sovereign secure communication systems.
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[UPSC CSE 2025]Consider the following statements:I. No virus can survive in ocean waters.II. No virus can infect bacteria.III. No virus can change the cellular transcriptional activity in host cells.
How many of the statements given above are correct?
Correct Answer: (d) None
• Statement I is incorrect: Oceans contain over 10³⁰ viruses, primarily bacteriophages that regulate microbial populations and global carbon cycling.• Statement II is incorrect: Bacteriophages specifically infect and replicate within bacteria (used in phage therapy).• Statement III is incorrect: Viruses alter and manipulate host cellular transcriptional activity to promote viral gene expression.
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[UPSC CSE 2024]Which one of the following is synthesised in the human body that dilates blood vessels and increases blood flow?
Correct Answer: (a) Nitric oxide
• Nitric oxide (NO) is synthesized from L-arginine by the enzyme nitric oxide synthase in the endothelial lining of blood vessels.• It causes vasodilation by relaxing vascular smooth muscles, promoting blood flow.
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[UPSC CSE 2022]Consider the following statements in respect of probiotics:1. Probiotics are made of both bacteria and yeast.2. The organisms in probiotics are found in foods we ingest but they do not naturally occur in our gut.3. Probiotics help in the digestion of milk sugars.
Correct Answer: (c) 1 and 3
• Statement 1 is correct: Probiotics comprise live beneficial bacteria (e.g., Lactobacillus) as well as yeasts (e.g., Saccharomyces boulardii).• Statement 2 is incorrect: Probiotic microbes naturally colonize and inhabit the human gut flora.• Statement 3 is correct: Certain strains contain β-galactosidase, aiding the breakdown of lactose (milk sugar).
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[UPSC CSE 2022]Which one of the following statements best describes the role of B cells and T cells in the human body?
Correct Answer: (d)
• T lymphocytes (T cells): Directly identify and destroy infected/cancerous cells and regulate immune response.• B lymphocytes (B cells): Synthesize specialized defensive proteins called antibodies to neutralize pathogens.
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[UPSC CSE 2022]Certain species of which one of the following organisms are well known as cultivators of fungi?
Correct Answer: (a) Ant
• Leafcutter ants (Attini tribe) cut fresh vegetation to cultivate specialised fungal gardens inside their colonies as their primary nutritional source.
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[UPSC CSE 2021]Which of the following have species that can establish a symbiotic relationship with other organisms?1. Cnidarians2. Fungi3. Protozoa
Select the correct answer using the code given below:
Correct Answer: (d) 1, 2 and 3
• Cnidarians: Form symbiosis with dinoflagellate algae (Zooxanthellae in corals).• Fungi: Form Mycorrhizae with plant roots and Lichens with algae/cyanobacteria.• Protozoa: Flagellated protozoans live symbiotically inside termite guts to digest wood cellulose.
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[UPSC CSE 2021]Consider the following:1. Bacteria2. Fungi3. Virus
Which of the above can be cultured in artificial/synthetic medium?
Correct Answer: (a) 1 and 2 only
• Bacteria and Fungi synthesize their own metabolic energy and can readily grow on synthetic nutrient agar.• Viruses are obligate intracellular parasites; they lack independent metabolic machinery and cannot reproduce without living host cells.
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[UPSC CSE 2021]In nature, which of the following is/are most likely to be found surviving on a surface without soil?1. Fern2. Lichen3. Moss4. Mushroom
Correct Answer: (c) 2 and 3 only
• Lichens and Mosses are pioneer organisms capable of colonizing bare rock surfaces and masonry without true root systems or soil substrate.• Ferns require moist rooting soil; Mushrooms require rich decaying organic substrate.
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[UPSC CSE 2021]In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?1. Area of the hole in the lid2. Temperature of the flame3. Weight of the lid
Correct Answer: (c) 1 and 3 only
• The boiling point of water inside increases with the internal steam pressure.• Pressure is governed by the weight of the lid and the vent hole area.• The flame temperature only alters the rate of boiling, not the maximum achievable cooking temperature.
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[UPSC CSE 2021]With reference to furnace oil, consider the following statements:1. It is a product of oil refineries.2. Some industries use it to generate power.3. Its use causes sulphur emissions into the environment.
Which of the statements given above are correct?
• Furnace oil is a heavy bottom residue obtained from refinery crude distillation units.• Extensively burned in industrial boilers and thermal power plants.• Contains high sulphur concentrations, leading to SO₂ pollution and acid precipitation.
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[UPSC CSE 2021]Why is there a concern about copper smelting plants?1. They may release lethal quantities of carbon monoxide into the environment.2. The copper slag can cause the leaching of heavy metals into the environment.3. They may release sulphur dioxide as a pollutant.
Correct Answer: (b) 2 and 3 only
• Statement 1 is incorrect: Copper smelters do not emit lethal levels of carbon monoxide.• Statement 2 is correct: Slag byproducts contain heavy metals (arsenic, cadmium, lead) that leach into soil/groundwater.• Statement 3 is correct: Smelting sulphide ores (chalcopyrite) releases massive volumes of sulphur dioxide gas.
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[UPSC CSE 2021]Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
Correct Answer: (b) Polycarbonate
• Bisphenol A (BPA) is an industrial endocrine-disrupting chemical widely utilized in manufacturing hard, clear polycarbonate plastics and epoxy resins.
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[UPSC CSE 2021]Water can dissolve more substances than any other liquid because:
Correct Answer: (a) It is dipolar in nature
• Water possesses a high dipole moment and high dielectric constant. The unequal sharing of electrons creates partial positive and negative poles that dissociate ionic lattice structures.
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[UPSC CSE 2021]Which one of the following is a reason why astronomical distances are measured in light-years?
Correct Answer: (d) Speed of light is always same
• Under the laws of physics, the speed of light in vacuum ($c$) is invariant and constant across the universe, providing an immutable baseline for cosmological measurements.
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[UPSC CSE 2020]Which of the following statements are correct regarding the general difference between plant and animal cells?1. Plant cells have cellulose cell walls while animal cells do not.2. Plant cells do not have plasma membrane unlike animal cells which do.3. Mature plant cells have one large vacuole whilst animal cells have many small vacuoles.
• Statement 1 is correct: Plant cells possess a rigid outer cellulose wall.• Statement 2 is incorrect: Both plant and animal cells possess a functional plasma (cell) membrane.• Statement 3 is correct: Plant cells develop a prominent central vacuole taking up to 90% volume.
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[UPSC CSE 2020]Steel slag can be the material for which of the following?1. Construction of base road2. Improvement of agricultural soil3. Production of cement
• Slag aggregates provide structural stability for road sub-bases.• High lime/calcium content makes it effective for neutralizing acidic soils.• Used as raw material in blast-furnace Portland slag cement manufacture.
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[UPSC CSE 2019]The word Denisovan is sometimes mentioned in media in reference to:
Correct Answer: (b) an early human species
• Denisovans are an extinct subspecies of archaic hominins identified from bone fragments in the Denisova Cave in Siberia, coexisting with Neanderthals.
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[UPSC CSE 2019]Which one of the following statements is not correct regarding Hepatitis?
Correct Answer: (b)
• Highly effective preventative vaccines exist for Hepatitis B, while no widely available preventive vaccine currently exists for Hepatitis C.
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[UPSC CSE 2018]Which of the following are predictions of Albert Einstein’s General Theory of Relativity?1. Light is affected by gravity.2. The Universe is constantly expanding.3. Matter warps its surrounding space-time.
• General relativity formulated gravitational lensing (light deflection by massive objects), the dynamic curvature of space-time fabric, and provided the cosmological basis for cosmic expansion.
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[UPSC CSE 2017]Consider the following pairs of commonly consumed materials and controversial chemicals:1. Lipstick — Lead2. Soft Drinks — Brominated vegetable oils3. Chinese fast food — Monosodium glutamate (MSG)
Which of the pairs given above is/are correctly matched?
• Lead is a known trace contaminant in lip cosmetics.• Brominated vegetable oil (BVO) acts as an emulsifier in citrus soft drinks.• MSG (Ajinomoto) is an umami flavour enhancer in Asian fast food.
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[UPSC CSE 2018]What is the reason for Non-Metals to be a bad conductor of electricity?
Correct Answer: (c) Absence of readily available free electrons
• Electrical conduction occurs through the movement of delocalized electrons.• In non-metals, outer electrons are held tightly by the nucleus in localized covalent or ionic bonds, resulting in the absence of free mobile electrons.
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[UPSC CSE 2016]Which of the following statements is/are correct?Viruses can infect:1. bacteria2. fungi3. plants
• Bacteriophages infect bacteria.• Mycoviruses infect fungi.• Numerous plant viruses (like Tobacco Mosaic Virus) infect and cause pathology in flora.
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[UPSC CSE 2014]Consider the following pairs of Vitamins and their Deficiency diseases:1. Vitamin C — Scurvy2. Vitamin D — Rickets3. Vitamin E — Night blindness
• Pair 1 is correctly matched: Vitamin C deficiency causes Scurvy.• Pair 2 is correctly matched: Vitamin D deficiency causes Rickets in children.• Pair 3 is incorrect: Night blindness is caused by Vitamin A deficiency (Vitamin E deficiency results in neurological deficits and impaired reproduction).
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[UPSC CSE 2014]Which of the following is/are example(s) of chemical change?1. Crystallization of sodium chloride2. Melting of ice3. Souring of milk
Correct Answer: (b) 3 only
• Crystallization and Melting of ice are reversible physical phase changes where molecular composition remains identical.• Souring of milk is an irreversible chemical process wherein bacteria convert lactose into lactic acid.
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[UPSC CSE 2014]Lichens, which are capable of initiating ecological succession even on a bare rock, are actually a symbiotic association of:
Correct Answer: (b) Algae and fungi
• Lichens represent a mutualistic partnership between a photosynthetic partner (alga/cyanobacterium providing carbohydrates) and a structural partner (fungus providing shelter, water, and minerals).
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[UPSC CSE 2014]Which one of the following is the core energy transformation involved in photosynthesis?
• Solar energy (radiant/free kinetic energy) is trapped by chlorophyll pigments and converted into stable chemical potential energy stored within the bonds of glucose molecules.
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[UPSC CSE 2014]Among the following organisms, which one does not belong to the class of the other three?
Correct Answer: (a) Crab
• Mite, Scorpion, and Spider belong to the class Arachnida (characterized by 8 legs and lack of antennae).• Crab belongs to the class Crustacea (typically 10 jointed legs and 2 pairs of antennae).
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[UPSC CSE 2014]Which of the following statements is/are correct regarding vegetative propagation of plants?1. Vegetative propagation produces clonal population.2. Vegetative propagation helps in eliminating the virus.3. Vegetative propagation can be practiced most of the year.
• Statement 1 is correct: Offspring are genetically identical clones of the parent plant.• Statement 2 is incorrect: Viral infections present in systemic tissues are readily transmitted to vegetative propagules.• Statement 3 is correct: Can be implemented throughout majority periods under controlled horticulture.
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[UPSC CSE 2013]Fruits stored in a cold chamber exhibit longer storage life because:
Correct Answer: (c) rate of respiration is decreased
• Cold temperatures significantly lower the enzymatic activity responsible for plant respiration and metabolic degradation, suppressing ethylene production and slowing senescence.
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[UPSC CSE 2013]Many transplanted seedlings do not survive because:
Correct Answer: (c) most of the root hairs are lost during transplantation
• Microscopic root hairs are delicate single-cell extensions responsible for absorbing water and dissolved minerals; uprooting shears them off, inducing severe transplant shock.
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[UPSC CSE 2013]Which of the following statements is/are correct regarding viruses?1. Viruses lack enzymes necessary for the generation of energy.2. Viruses can be cultured in any synthetic medium.3. Viruses are transmitted from one organism to another by biological vectors only.
Select the correct answer using the codes given below:
Correct Answer: (a) 1 only
• Statement 1 is correct: Viruses lack ATP-generating metabolic enzymes and mitochondria.• Statement 2 is incorrect: They cannot propagate in synthetic nutrient media; they require living host cells.• Statement 3 is incorrect: Can also be transmitted through air, water, direct contact, and mechanical vectors.
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[UPSC CSE 2013]Ball bearings are used in bicycles, automobiles, etc., because:
Correct Answer: (c)
• By replacing sliding friction with rolling friction, ball bearings dramatically diminish the effective contact surface area between the moving wheel and stationary axle, mitigating frictional wear and resistance.
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[UPSC CSE 2013]With reference to the four fundamental forces of nature (gravity, electromagnetism, weak nuclear, strong nuclear), which one of the following statements is not correct?
Correct Answer: (a) Gravity is the strongest of the four
• Gravity is actually the weakest fundamental force in the cosmos (Strong nuclear force is the strongest, approximately 10³⁸ times stronger than gravity).
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[UPSC CSE 2013]A rainbow is produced when sunlight falls on droplets of rain. Which of the following physical phenomena are responsible for this?1. Dispersion2. Refraction3. Internal reflection
Select the correct answer using the codes below:
• When light penetrates a spherical raindrop, it experiences refraction upon entry, breaks into its component spectrum through dispersion, undergoes internal reflection at the rear boundary, and refracts again upon exit.
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[UPSC CSE 2013]Consider the following phenomena:1. Size of the sun at dusk.2. Color of the sun at dawn.3. Moon being visible at dawn.4. Twinkle of stars in the sky.5. Polestar being visible in the sky.
Which of the above are optical illusions?
Correct Answer: (c) 1, 2 and 4
• Size of the sun at dusk: Apparent enlargement is an optical/psychological illusion.• Color of sun at dawn & Twinkling of stars: Result from atmospheric scattering and refractive turbulence.• Moon and Polestar positions are physical celestial locations, not illusions.
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[UPSC CSE 2013]Consider the following minerals:1. Calcium2. Iron3. Sodium
Which of the minerals given above is/are required by the human body for the contraction of muscles?
• Calcium: Directly triggers actin-myosin binding in muscle fibers.• Sodium: Generates action potentials across muscular membranes.• Iron: Essential constituent of myoglobin delivering oxygen required for muscular contractions.
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[UPSC CSE 2013]Consider the following animals:1. Sea cow2. Seahorse3. Sea lion
Which of the above is/are mammal(s)?
Correct Answer: (b) 1 and 3 only
• Sea cow (Dugong/Manatee): Herbivorous marine mammal (order Sirenia).• Sea lion: Pinniped marine mammal.• Seahorse: Syngnathid bony fish (not a mammal).
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[UPSC CSE 2013]What is/are the importance of discovering the Higgs boson particle?1. It will help us to understand why elementary particles have mass.2. It will enable us to transfer matter without traversing physical space.3. It will enable us to create better fuel for nuclear fission.
• Statement 1 is correct: Confirms the existence of the Higgs field, explaining how gauge bosons acquire mass in the Standard Model.• Statements 2 & 3 are fictitious and unrelated to Higgs field physics.
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[UPSC CSE 2019]With reference to recent developments in science, which one of the following statements is not correct?
Correct Answer: (a)
• Creating functional artificial chromosomes entirely by splicing DNA segments between completely different species remains technologically unviable.• Laboratory artificial DNA synthesis and cell division in petri dishes have been achieved.
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