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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]]
True or False: At equilibrium, the forward and reverse reaction rates are zero.
- True
- False
Answer: False
At dynamic equilibrium, forward and reverse rates are equal (not zero), so concentrations remain constant. Reactions continue but with no net change. Key concept in chemical kinetics. [[NCERT Chemistry Class 11]]
True or False: Meiosis results in four genetically identical daughter cells.
- True
- False
Answer: False
Meiosis produces four genetically unique haploid cells (gametes) due to crossing over and independent assortment. Mitosis produces two identical diploid cells. Critical for genetics. [[NCERT Biology Class 11]]
True or False: The pitch of sound depends on its amplitude.
- True
- False
Answer: False
Pitch depends on frequency (higher frequency = higher pitch). Amplitude determines loudness. Confusing these is a common exam trap. [[NCERT Physics Class 9]]
True or False: Blockchain technology is primarily used for cryptocurrency transactions only.
- True
- False
Answer: False
While Bitcoin popularized blockchain, its applications include supply chain tracking, voting systems, healthcare records, and smart contracts. Decentralized ledger technology has broad utility. [[NITI Aayog Reports]]
True or False: EDTA is a monodentate ligand.
- True
- False
Answer: False
EDTA (ethylenediaminetetraacetate) is a hexadentate ligand, forming six coordinate bonds with metal ions. Used in chelation therapy and water softening. Important for advanced chemistry. [[NCERT Chemistry Class 12]]
True or False: Oxygen released during photosynthesis comes from water molecules.
- True
- False
Answer: True
In light-dependent reactions, water photolysis splits H₂O into O₂, protons, and electrons. The O₂ is released as byproduct. Confirmed by isotopic labeling experiments. [[NCERT Biology Class 11]]
True or False: Bernoulli's principle states that pressure increases with increase in fluid speed.
- True
- False
Answer: False
Bernoulli's principle: in a flowing fluid, pressure decreases as speed increases (conservation of energy). Explains airplane lift, venturi effect. Common misconception in exams. [[NCERT Physics Class 11]]
True or False: PM2.5 refers to particulate matter with diameter less than 2.5 micrometers.
- True
- False
Answer: True
PM2.5 particles are fine inhalable particles (≤2.5 μm) that penetrate deep into lungs, causing respiratory/cardiovascular issues. Monitored under National Air Quality Index. [[CPCB Reports, NCERT Geography Class 11]]
True or False: In a galvanic cell, oxidation occurs at the cathode.
- True
- False
Answer: False
In galvanic (voltaic) cells: oxidation at anode (loss of e⁻), reduction at cathode (gain of e⁻). Mnemonic: 'AnOx RedCat'. Critical for electrochemistry problems. [[NCERT Chemistry Class 12]]
True or False: Darwin's theory of natural selection states that organisms with advantageous traits are more likely to survive and reproduce.
- True
- False
Answer: True
Natural selection is the mechanism of evolution where heritable traits enhancing survival/reproduction become more common over generations. Foundational concept in biology. [[NCERT Biology Class 12]]
True or False: Nuclear fusion powers the Sun and stars.
- True
- False
Answer: True
In stellar cores, hydrogen nuclei fuse into helium under extreme temperature/pressure, releasing vast energy (E=mc²). Fusion differs from fission (splitting heavy nuclei). Key astrophysics concept. [[NCERT Physics Class 12]]
True or False: Phishing is a type of malware that encrypts files for ransom.
- True
- False
Answer: False
Phishing is social engineering (fraudulent emails) to steal credentials. Ransomware encrypts files for payment. Distinguishing cyber threats is important for digital literacy sections. [[CERT-In Guidelines, NCERT Computer Science]]
True or False: Catalysts increase the activation energy of a chemical reaction.
- True
- False
Answer: False
Catalysts lower activation energy, speeding up reactions without being consumed. They provide alternative pathways. Enzymes are biological catalysts. Key concept in chemical kinetics. [[NCERT Chemistry Class 12]]
True or False: Antibiotics are effective against viral infections like common cold.
- True
- False
Answer: False
Antibiotics target bacterial cell structures/processes. Viruses lack these targets and require antivirals or vaccines. Misuse of antibiotics causes resistance—a major public health issue. [[NCERT Biology Class 12, WHO Guidelines]]
True or False: Like magnetic poles attract each other.
- True
- False
Answer: False
Like poles (N-N or S-S) repel; unlike poles (N-S) attract. This fundamental law of magnetism applies to bar magnets, electromagnets, and Earth's magnetic field. [[NCERT Physics Class 10]]