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True or False: Alluvial soil is the most widespread soil type in India.
- True
- False
Answer: True
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]]
True or False: Benzene undergoes electrophilic substitution reactions readily.
- True
- False
Answer: True
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]]
True or False: BMI stands for Body Mass Index.
- True
- False
Answer: True
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]]
True or False: Viscosity of liquids decreases with increase in temperature.
- True
- False
Answer: True
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]]
True or False: In blockchain, each block contains a cryptographic hash of the previous block.
- True
- False
Answer: True
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]]
True or False: The standard hydrogen electrode (SHE) has a potential of 0 V by definition.
- True
- False
Answer: True
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]]
True or False: Homologous organs indicate common ancestry.
- True
- False
Answer: True
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]]
True or False: Fleming's left-hand rule is used to find the direction of induced current.
- True
- False
Answer: False
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]]
True or False: Colligative properties depend on the nature of solute particles.
- True
- False
Answer: False
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]]
True or False: Angular momentum is conserved when net external torque is zero.
- True
- False
Answer: True
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]]
True or False: A food chain always starts with herbivores.
- True
- False
Answer: False
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]]
True or False: UMANG app provides access to multiple central and state government services.
- True
- False
Answer: True
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]]
True or False: Alkenes undergo addition reactions due to the presence of pi bonds.
- True
- False
Answer: True
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]]
True or False: In an adiabatic process, heat exchange with surroundings is zero.
- True
- False
Answer: True
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]]
True or False: A test cross is performed between a dominant phenotype individual and a homozygous recessive individual.
- True
- False
Answer: True
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]]
True or False: Kaziranga National Park in Assam is a UNESCO World Heritage Site primarily for the Indian one-horned rhinoceros.
- True
- False
Answer: True
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]]
True or False: Two-factor authentication (2FA) enhances security by requiring two different types of credentials.
- True
- False
Answer: True
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]]
True or False: Modulation is the process of superimposing a low-frequency signal onto a high-frequency carrier wave.
- True
- False
Answer: True
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]]
True or False: Bryophytes are known as amphibians of the plant kingdom because they require water for fertilization.
- True
- False
Answer: True
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]]
True or False: Work done by a force is zero if displacement is perpendicular to force.
- True
- False
Answer: True
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]]