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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]]
The general formula for alkanes is ________.
- CₙH₂ₙ
- CₙH₂ₙ₊₂
- CₙH₂ₙ₋₂
- CₙHₙ
Answer: CₙH₂ₙ₊₂
Alkanes are saturated hydrocarbons with single bonds: CₙH₂ₙ₊₂ (e.g., methane CH₄, ethane C₂H₆). Alkenes: CₙH₂ₙ; Alkynes: CₙH₂ₙ₋₂. Foundational organic chemistry. [[NCERT Chemistry Class 11]]
Yeast used in baking and brewing belongs to the kingdom ________.
- Monera
- Protista
- Fungi
- Plantae
Answer: Fungi
Yeast (Saccharomyces cerevisiae) is a unicellular fungus. It ferments sugars to produce CO₂ (leavens bread) and ethanol (in brewing). Important for applied biology. [[NCERT Biology Class 11]]
Which electromagnetic wave has the longest wavelength?
- Gamma rays
- X-rays
- Visible light
- Radio waves
Answer: Radio waves
EM spectrum order (longest to shortest wavelength): Radio > Microwave > IR > Visible > UV > X-ray > Gamma. Radio waves used in communication; gamma rays in cancer treatment. [[NCERT Physics Class 12]]
Aadhaar is a ________-digit unique identity number issued by UIDAI.
- 10
- 12
- 14
- 16
Answer: 12
Aadhaar is a 12-digit biometric ID for Indian residents, enabling access to subsidies and services. Part of Digital India initiative for inclusive governance. [[UIDAI Reports, NCERT Computer Science]]
Adsorption of gases on solid surfaces is an ________ process.
- Endothermic
- Exothermic
- Isothermal
- Adiabatic
Answer: Exothermic
Adsorption releases heat (ΔH < 0) as gas molecules lose freedom on surface. Desorption is endothermic. Important for catalysis and purification processes. [[NCERT Chemistry Class 12]]
The longest bone in the human body is the ________.
- Humerus
- Femur
- Tibia
- Fibula
Answer: Femur
Femur (thigh bone) is the longest and strongest bone, supporting body weight and enabling movement. Critical for anatomy questions in exams. [[NCERT Biology Class 11]]
Ohm's law states that V = I × ________.
- Power
- Resistance
- Capacitance
- Inductance
Answer: Resistance
Ohm's Law: Voltage (V) = Current (I) × Resistance (R). Valid for ohmic conductors at constant temperature. Foundation for circuit analysis. [[NCERT Physics Class 10]]
Planting trees in rows to reduce wind speed and prevent soil erosion is called ________.
- Contour ploughing
- Terracing
- Shelter belts
- Crop rotation
Answer: Shelter belts
Shelter belts (windbreaks) are rows of trees/shrubs that reduce wind erosion, conserve moisture, and protect crops. Part of sustainable agriculture practices. [[NCERT Geography Class 11, MoA Reports]]
The element responsible for the hardness of diamond is ________.
- Silicon
- Carbon
- Boron
- Nitrogen
Answer: Carbon
Diamond is an allotrope of carbon with tetrahedral sp³ hybridization, forming a rigid 3D network. This structure gives extreme hardness. Graphite is another carbon allotrope with different properties. [[NCERT Chemistry Class 11]]
The hormone insulin is secreted by the ________ of pancreas.
- Alpha cells
- Beta cells
- Delta cells
- Acinar cells
Answer: Beta cells
Pancreatic beta cells (in Islets of Langerhans) secrete insulin, which lowers blood glucose by facilitating cellular uptake. Deficiency causes diabetes mellitus. Key physiology concept. [[NCERT Biology Class 11]]