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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]]
True or False: 5G networks operate only on high-frequency millimeter waves.
- True
- False
Answer: False
5G uses three spectrum bands: low-band (<1 GHz), mid-band (1-6 GHz), and high-band mmWave (24-47 GHz). Each offers different coverage/speed trade-offs. Important for tech awareness. [[TRAI Reports, NITI Aayog]]
True or False: Oxidation involves gain of electrons.
- True
- False
Answer: False
Oxidation is loss of electrons (OIL: Oxidation Is Loss); reduction is gain of electrons (RIG). Mnemonic helps avoid confusion in redox reactions. [[NCERT Chemistry Class 11]]
True or False: All mammals are viviparous.
- True
- False
Answer: False
Most mammals are viviparous (live birth), but monotremes like platypus and echidna are oviparous (egg-laying). Exceptions are important for taxonomy questions. [[NCERT Biology Class 11]]
True or False: Displacement can be greater than distance traveled.
- True
- False
Answer: False
Displacement (shortest path) is always ≤ distance traveled (actual path). They are equal only for straight-line motion without direction change. Fundamental kinematics concept. [[NCERT Physics Class 11]]
True or False: The safe limit for continuous noise exposure is 85 decibels for 8 hours.
- True
- False
Answer: True
As per WHO and CPCB, prolonged exposure above 85 dB can cause hearing damage. Noise pollution regulations limit industrial/residential noise levels. Important for environmental awareness. [[CPCB Guidelines, NCERT Geography Class 11]]