Science – True/False – GK Questions

Alluvial soil (deposited by rivers) covers ~40% of India, especially Indo-Gangetic plains. Fertile, rich in potash, supports intensive agriculture. Important for geography and agriculture. [[ICAR Reports, NCERT Geography Class 11]]

Benzene's delocalized π-electrons attract electrophiles. Substitution preserves aromatic stability; addition would break resonance. Nitration, halogenation, sulfonation are classic examples. [[NCERT Chemistry Class 11]]

BMI = weight (kg) / height (m)². Categories: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30). Simple screening tool for weight-related health risks. [[WHO, MoHFW Guidelines]]

Higher temperature increases molecular kinetic energy, reducing intermolecular forces and internal friction. Hence, honey flows faster when heated. Opposite trend for gases. [[NCERT Physics Class 11]]

This chaining via hashes ensures immutability: altering one block changes its hash, breaking the chain. Combined with consensus mechanisms, it provides security and transparency. [[NITI Aayog Reports]]

SHE is the reference electrode with E° = 0.00 V at 298K, 1 atm, 1M H⁺. All other electrode potentials are measured relative to SHE. Fundamental for electrochemical series. [[NCERT Chemistry Class 12]]

Homologous structures (e.g., human arm, bat wing, whale flipper) share similar bone structure but different functions, indicating divergent evolution from common ancestor. Key evidence for evolution. [[NCERT Biology Class 12]]

Fleming's left-hand rule: for motors (force on current-carrying conductor). Right-hand rule: for generators (induced current). Mnemonic: 'Left for Motor, Right for Generator'. [[NCERT Physics Class 10]]

Colligative properties (vapor pressure lowering, boiling point elevation, etc.) depend only on number of solute particles, not their identity. Important for solution chemistry. [[NCERT Chemistry Class 12]]

Conservation of angular momentum: if τ_ext = 0, L = constant. Explains ice-skater spin, planetary motion, gyroscopes. Fundamental rotational dynamics principle. [[NCERT Physics Class 11]]

Food chains start with producers (autotrophs like plants) that convert solar energy to chemical energy. Herbivores are primary consumers. Understanding trophic levels is fundamental. [[NCERT Biology Class 12]]

UMANG (Unified Mobile Application for New-age Governance) is a single-window platform for 1,200+ services (Aadhaar, PAN, EPFO, etc.). Part of Digital India for citizen convenience. [[MeitY Reports]]

Pi bonds in C=C are weaker and more reactive than sigma bonds, allowing addition of H₂, X₂, HX, etc. Alkanes (only sigma bonds) undergo substitution. Core organic reaction mechanism. [[NCERT Chemistry Class 11]]

Adiabatic process: Q=0, so ΔU = -W. Temperature changes due to work done. Applies to rapid compression/expansion (e.g., diesel engine, atmospheric phenomena). [[NCERT Physics Class 11]]

Test cross determines genotype of dominant phenotype: if any recessive offspring appear, the parent is heterozygous. Fundamental tool in Mendelian genetics. [[NCERT Biology Class 12]]

Kaziranga (inscribed 1985) hosts ~70% of world's greater one-horned rhinos. It also protects tigers, elephants, and wetland biodiversity. Important for environment and geography exams. [[UNESCO, MoEFCC Reports]]

2FA combines something you know (password) with something you have (OTP/app) or something you are (biometric). This layered approach significantly reduces unauthorized access risks. [[CERT-In Guidelines, NCERT Computer Science]]

Modulation (AM/FM) enables efficient transmission of audio/video signals over long distances by shifting them to higher frequencies suitable for antenna radiation. Core concept in telecommunications. [[NCERT Physics Class 12]]

Bryophytes (mosses, liverworts) need water for sperm to swim to egg during fertilization, though they live on land. This dual dependency earns them the 'amphibians' title. Key concept in plant evolution. [[NCERT Biology Class 11]]

Work W = F·d·cosθ. If θ=90°, cos90°=0, so W=0. Example: centripetal force does no work in circular motion. Key concept in mechanics. [[NCERT Physics Class 11]]