General Q&A for Class 12 · Page 111
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Sunderban Delta
The Sundarbans (also spelled Sunderban) is the world's largest mangrove forest and river delta, formed where the Ganges, Brahmaputra, and Meghna rivers converge before emptying into the Bay of Bengal, spanning approximately 10,000 square kilometers across India (West Bengal) and Bangladesh. The name "Sundarbans" possibly derives from "Sundari" (Heritiera fomes), a mangrove species abundant in the region, or from "Sundarbans" meaning "beautiful forest" in Bengali. This vast, complex ecosystem
- GeneralClass 12All
How to Make Black Coffee
Making black coffee (coffee without milk, cream, or sugar) can be done through various methods, each producing different flavor profiles. The basic principle involves extracting soluble compounds from roasted, ground coffee beans using hot water. Here are common methods: (1) Drip/Filter Coffee Maker: Add coffee grounds (about 1-2 tablespoons per 6 oz water, adjust to taste) to filter basket, pour cold water into reservoir, turn on machine, and wait for brewing to complete—simple, consis
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Quintal to KG
One quintal equals 100 kilograms. The quintal (symbol: q) is a unit of mass used in several countries, particularly in agriculture and trade for measuring crops, produce, and bulk commodities. The term derives from Latin "centum" (hundred), with "quintal" reflecting its value as a hundredweight. In the metric system, the conversion is straightforward: 1 quintal = 100 kg, making calculations simple since it's based on base-10 system. The quintal is commonly used in: agriculture (crop y
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Value of Cos 180
The value of cos 180° equals -1. This is a standard trigonometric value that students memorize along with other important angles. Understanding why cos 180° = -1 can be visualized using the unit circle—a circle with radius 1 centered at the origin. In this representation, the cosine of an angle represents the x-coordinate of the point where the angle's terminal side intersects the unit circle. At 180° (or π radians), the terminal side points directly to the left along the
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POSCO Full Form
POSCO stands for Protection of Children from Sexual Offences, specifically referring to the Protection of Children from Sexual Offences Act, 2012 (POSCO Act), a comprehensive law in India enacted to protect children from sexual abuse, exploitation, and pornography. The act was passed by Parliament and came into force on November 14, 2012, establishing India's first specific legal framework addressing sexual crimes against children with child-friendly procedures and stringent punishments. A "c
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Wizard
A wizard is traditionally defined as a person, typically male (the female equivalent often being witch or sorceress), who practices magic or possesses supernatural powers, appearing prominently in mythology, folklore, fantasy literature, and popular culture. Wizards are typically depicted as wise, knowledgeable individuals who have studied arcane arts, cast spells, create potions, and manipulate natural forces through magical means. Famous literary wizards include Merlin from Arthurian legend
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PAC Full Form
PAC has multiple meanings depending on context. In Indian law enforcement, PAC stands for Provincial Armed Constabulary, a state-level paramilitary force, with the most prominent being Uttar Pradesh Provincial Armed Constabulary, established in 1948 as a reserve armed police force for maintaining law and order, assisting civil police, handling riots and civil disturbances, crowd control during major events, and providing security during elections or VIP movements. The UP PAC, one of India's l
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Biosphere Reserves in India
India has 18 biosphere reserves as of 2024, designated to conserve biodiversity, promote sustainable development, and provide sites for research and environmental education. Biosphere reserves are areas of terrestrial and coastal ecosystems promoting solutions reconciling conservation of biodiversity with its sustainable use, recognized under UNESCO's Man and the Biosphere (MAB) Programme. Each reserve typically comprises three zones: core zone (legally protected area with minimal human inter
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Total Population of World
The world's population reached approximately 8 billion people in November 2022, according to United Nations estimates, marking a historic milestone in human demographic history. As of 2024-2025, the global population stands at approximately 8.1 billion and continues growing, though at a slowing rate compared to previous decades. The distribution is highly uneven: Asia contains about 60% of world population (approximately 4.7-4.8 billion), Africa about 18% (approximately 1.4-1.5 billion), Euro
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How Many Inches in 1 Feet
One foot equals 12 inches. This is a fundamental conversion in the imperial or US customary measurement system, where the foot and inch are standard units for measuring length and distance. The relationship is defined: 1 foot (ft) = 12 inches (in), making inches one-twelfth of a foot. Understanding this conversion is essential for working with measurements in countries using imperial units (primarily the United States) and for converting between metric and imperial systems. The conver
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Capital of Lakshadweep
Kavaratti is the capital of Lakshadweep, India's smallest union territory located in the Arabian Sea, approximately 200-440 kilometers off the Kerala coast. Kavaratti island, covering about 4.22 square kilometers, serves as the administrative headquarters of Lakshadweep, housing the territory's administrative offices, including the residence of the Administrator (appointed by the President of India), Secretariat, and other government departments. The island is also the most developed in the a
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Linear Equations
Linear equations are algebraic equations where the highest power of the variable(s) is one, graphically representing straight lines in coordinate geometry. The simplest form of a linear equation in one variable is: ax + b = 0, where a and b are constants and a ≠ 0, solved by isolating x: x = -b/a. For example, 3x + 6 = 0 gives x = -2. Linear equations in two variables have the form: ax + by + c = 0 or y = mx + c (slope-intercept form), where m is the slope and c is the y-intercept, represe
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Smallest Bone in Human Body
The stapes (also called stirrup bone due to its stirrup shape) is the smallest bone in the human body, located in the middle ear. Measuring approximately 2.5-3.3 millimeters in length and weighing about 2-4.3 milligrams, the stapes is one of three tiny bones (ossicles) in the middle ear, along with the malleus (hammer) and incus (anvil). These three bones form a chain connecting the eardrum (tympanic membrane) to the inner ear (oval window of the cochlea), playing a crucial role in hearing by
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Active Mass of 2 Mol of NaCl
Active mass (also called molar concentration) in chemistry refers to the concentration of a substance expressed in moles per liter (mol/L or M), essentially synonymous with molarity in the context of chemical equilibrium and rate equations. However, the question "active mass of 2 mol of NaCl" is incomplete without specifying the volume of solution. Active mass cannot be determined from moles alone—you need both the amount of substance (moles) and the volume of solution containing it. If
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Prime Minister of India Salary
The Prime Minister of India's official salary is currently ₹2,00,000 (two lakh rupees) per month as per the parliamentary salary structure, though this comprises only the direct monetary salary. The total compensation package includes numerous allowances and benefits: daily allowance when Parliament is in session (₹2,000 per day), constituency allowance (₹70,000 per month for maintaining offices in constituency), office expense allowance (₹60,000 per month), secretarial assistance (₹40,000 pe
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3E Means in Train
3E in Indian Railways refers to Third AC Economy class, a category introduced to provide air-conditioned travel at prices more affordable than regular 3AC (Third AC) class while still maintaining basic AC comfort. The 3E class is positioned between standard 3AC and Sleeper class in terms of both pricing and amenities, making AC travel accessible to more passengers by offering tickets approximately 10-15% cheaper than regular 3AC while providing the essential benefit of air-conditioning.
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Tyndall Effect
The Tyndall effect is the phenomenon where light is scattered by particles in a colloid or very fine suspension, making the light beam visible when it passes through the medium. Named after 19th-century physicist John Tyndall who extensively studied it, this effect occurs when light encounters particles larger than individual molecules but smaller than what can be seen with the naked eye (typically 1-1000 nanometers in diameter). The scattering makes the path of the light beam visible, which
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BDO Full Form
BDO stands for Block Development Officer, a senior administrative position in Indian rural development administration responsible for implementing government development programs at the block level (a subdivision between district and village, typically covering 100-200 villages with 100,000-200,000 population). The BDO serves as the chief executive of the Block Panchayat (rural local government), coordinating various government departments, implementing schemes, overseeing development project
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PCR Full Form
PCR stands for Polymerase Chain Reaction, a revolutionary molecular biology technique developed by Kary Mullis in 1983 (earning him the Nobel Prize in Chemistry in 1993) that allows amplification of specific DNA sequences, creating millions or billions of copies from a tiny initial sample. This technique has transformed biology, medicine, forensics, and research by enabling DNA analysis from minimal starting material—even a single cell can provide enough DNA for PCR amplification and su
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Potential Energy
Potential energy is the energy possessed by an object due to its position, configuration, or state, representing stored energy that has the potential to be converted into other forms (typically kinetic energy, heat, or other energy types). Unlike kinetic energy which depends on motion, potential energy depends on an object's position relative to other objects or its internal configuration. The most common types are gravitational potential energy and elastic potential energy, though other form