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For a spontaneous process at constant T and P, the Gibbs free energy change (ΔG) must be ________.
- Positive
- Negative
- Zero
- Infinite
Answer: Negative
ΔG = ΔH - TΔS. If ΔG < 0, process is spontaneous; ΔG > 0, non-spontaneous; ΔG = 0, equilibrium. Unifies enthalpy and entropy for predicting reaction feasibility. [[NCERT Chemistry Class 11]]
The vascular bundles in dicot stems are arranged in a ________ pattern.
- Scattered
- Ring
- Radial
- Concentric
Answer: Ring
Dicot stems have vascular bundles in a ring (eustele), enabling secondary growth. Monocots have scattered bundles (atactostele). Key difference in plant anatomy. [[NCERT Biology Class 11]]
The SI unit of magnetic flux is ________.
- Tesla
- Weber
- Henry
- Gauss
Answer: Weber
Weber (Wb) = magnetic flux; Tesla (T) = magnetic flux density (B = Φ/A). 1 Wb = 1 T·m². Important for electromagnetism problems. [[NCERT Physics Class 12]]
The 3R principle for waste management stands for Reduce, Reuse, and ________.
- Recycle
- Refuse
- Rot
- Repair
Answer: Recycle
3Rs promote sustainable consumption: Reduce waste generation, Reuse items, Recycle materials into new products. Core concept in environmental education and policy. [[MoEFCC Guidelines, NCERT Geography Class 11]]
The inert pair effect is most prominent in the ________ group of p-block elements.
- 13
- 14
- 15
- 16
Answer: 13
In Group 13 (B, Al, Ga, In, Tl), ns² electrons resist participation in bonding down the group. Tl⁺ is more stable than Tl³⁺ due to inert pair effect. Important for periodic trends. [[NCERT Chemistry Class 11]]
The hormone that triggers ovulation in human females is ________.
- FSH
- LH
- Estrogen
- Progesterone
Answer: LH
LH (Luteinizing Hormone) surge from pituitary triggers release of mature ovum from Graafian follicle (~day 14 of menstrual cycle). Critical for reproductive physiology. [[NCERT Biology Class 12]]
The de Broglie wavelength of a particle is inversely proportional to its ________.
- Energy
- Momentum
- Mass
- Velocity
Answer: Momentum
de Broglie hypothesis: λ = h/p, where p = momentum. Establishes wave-particle duality for matter. Verified by electron diffraction experiments. Foundational quantum mechanics. [[NCERT Physics Class 12]]
For a zero-order reaction, the unit of rate constant is ________.
- s⁻¹
- mol L⁻¹ s⁻¹
- L mol⁻¹ s⁻¹
- mol² L⁻² s⁻¹
Answer: mol L⁻¹ s⁻¹
Zero-order: rate = k, so k has same units as rate (concentration/time). First-order: s⁻¹; Second-order: L mol⁻¹ s⁻¹. Unit analysis helps identify reaction order. [[NCERT Chemistry Class 12]]
El Niño is a climate pattern associated with warming of waters in the ________ Ocean.
- Atlantic
- Indian
- Pacific
- Arctic
Answer: Pacific
El Niño involves unusual warming of central/eastern tropical Pacific, disrupting global weather (monsoons, droughts, floods). La Niña is the cooling phase. Important for geography. [[IMD Reports, NCERT Geography Class 11]]
The pacemaker of the human heart is the ________ node.
- AV
- SA
- Bundle of His
- Purkinje
Answer: SA
SA (sinoatrial) node in right atrium generates electrical impulses initiating heartbeat (~72/min). AV node delays signal for atrial contraction. Critical for circulatory system understanding. [[NCERT Biology Class 11]]
The National Air Quality Index (NAQI) in India uses ________ color codes to represent air quality levels.
- 5
- 6
- 7
- 8
Answer: 6
NAQI has six categories: Good (Green), Satisfactory (Light Green), Moderately Polluted (Yellow), Poor (Orange), Very Poor (Red), Severe (Maroon). Helps public understand pollution levels. [[CPCB Guidelines]]
The coordination number of cobalt in [Co(NH₃)₆]Cl₃ is ________.
- 3
- 4
- 5
- 6
Answer: 6
Coordination number = number of ligand donor atoms bonded to central metal. Here, six NH₃ molecules coordinate to Co³⁺, giving octahedral geometry. Key concept in Werner's theory. [[NCERT Chemistry Class 12]]
A device that converts AC to DC is called a ________.
- Transformer
- Rectifier
- Inverter
- Amplifier
Answer: Rectifier
Rectifiers (using diodes) convert alternating current to direct current. Half-wave and full-wave rectifiers are basic power supply components. Essential for electronics fundamentals. [[NCERT Physics Class 12]]
The hormone that promotes fruit ripening in plants is ________.
- Auxin
- Gibberellin
- Cytokinin
- Ethylene
Answer: Ethylene
Ethylene is a gaseous plant hormone triggering ripening, senescence, and abscission. Commercially used for artificial ripening of bananas, mangoes. Important for agriculture questions. [[NCERT Biology Class 11]]
ISRO's launch vehicle that uses cryogenic engines in its upper stage is ________.
- PSLV
- GSLV
- SSLV
- ASLV
Answer: GSLV
GSLV (Geosynchronous Satellite Launch Vehicle) uses indigenous cryogenic upper stage (CE-7.5/CE-20) for launching heavy satellites to GTO. PSLV uses solid/liquid stages. Key for space tech awareness. [[ISRO Reports]]
In volumetric analysis, the point at which the reaction is just complete is called the ________ point.
- End
- Equivalence
- Neutralization
- Titration
Answer: Equivalence
Equivalence point: stoichiometric completion of reaction. End point: indicator color change (ideally matches equivalence). Distinction is critical for accurate titrations. [[NCERT Chemistry Class 11]]
The spectral series of hydrogen lying in the visible region is called ________ series.
- Lyman
- Balmer
- Paschen
- Brackett
Answer: Balmer
Balmer series (n=2 to higher levels) produces visible lines (Hα, Hβ, etc.). Lyman is UV, Paschen/Brackett are IR. Understanding spectral series is key for atomic structure questions. [[NCERT Physics Class 12]]
Jaundice is characterized by yellowing of skin and eyes due to accumulation of ________.
- Urea
- Bilirubin
- Creatinine
- Uric acid
Answer: Bilirubin
Bilirubin, a yellow pigment from hemoglobin breakdown, accumulates in blood due to liver dysfunction, bile duct obstruction, or excessive RBC destruction. Key diagnostic indicator in medicine. [[NCERT Biology Class 11]]
The Contact Process is used for the industrial production of ________ acid.
- Nitric
- Hydrochloric
- Sulfuric
- Phosphoric
Answer: Sulfuric
Contact Process oxidizes SO₂ to SO₃ using V₂O₅ catalyst, then absorbs in H₂SO₄ to form oleum. Sulfuric acid is vital for fertilizers, batteries, and chemicals. Important industrial chemistry. [[NCERT Chemistry Class 12]]
Project Tiger was launched in India in the year ________.
- 1971
- 1973
- 1980
- 1992
Answer: 1973
Project Tiger launched on April 1, 1973, to conserve Bengal tigers and their habitats. India now has over 3,000 tigers (2022 census). Landmark conservation initiative. [[NTCA Reports, NCERT Biology Class 12]]