General Q&A for Class 12 · Page 120
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Ethyl Bromide Prepared from Ethyl Alcohol
Ethyl bromide (bromoethane) can be prepared from ethyl alcohol (ethanol) through a substitution reaction using phosphorus tribromide (PBr₃) or hydrobromic acid (HBr) in the presence of sulfuric acid. The most common laboratory method involves treating ethanol with red phosphorus and bromine, where the red phosphorus combines with bromine to generate phosphorus tribromide in situ, which then reacts with ethanol to produce ethyl bromide, phosphorous acid, and water. The reaction can be represen
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NASA Full Form
NASA stands for National Aeronautics and Space Administration, the independent United States federal agency responsible for the civilian space program, aeronautics research, and space exploration. Established in 1958 in response to the Soviet Union's launch of Sputnik, NASA has been at the forefront of humanity's ventures beyond Earth, achieving historic milestones including the Apollo moon landings (with Neil Armstrong and Buzz Aldrin becoming the first humans on the moon in 1969), launching
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Sunrise
Sunrise is the moment when the upper edge of the sun becomes visible above the horizon in the morning, marking the beginning of daylight and the transition from night to day. This daily phenomenon occurs due to Earth's rotation on its axis—as Earth spins eastward at approximately 1,670 kilometers per hour at the equator, different parts of the planet gradually turn toward the sun, creating the appearance of the sun "rising" in the east. The exact time and position of sunrise vary throug
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PM Scholarship
The Prime Minister's Scholarship Scheme (PMSS) is a central government initiative that provides financial assistance to children and widows of deceased or disabled armed forces personnel, paramilitary forces, railway employees, and coast guard members who have sacrificed their lives or sustained injuries in service to the nation. The scholarship provides substantial financial support—currently up to ₹3,000 per month for boys and girls pursuing professional courses, enabling these studen
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Chess Game
Chess is a strategic board game played between two opponents on an 8×8 checkered board with 64 squares, where each player begins with 16 pieces: one king, one queen, two rooks, two bishops, two knights, and eight pawns. The objective is to checkmate the opponent's king, which means placing it under an inescapable threat of capture. Originating in India around the 6th century as chaturanga, chess has evolved into a globally recognized intellectual sport with standardized rules establishe
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IIT Madras
Indian Institute of Technology Madras (IIT Madras) is one of India's most prestigious technical and engineering institutes, consistently ranked as the top engineering college in India by the National Institutional Ranking Framework (NIRF) for multiple consecutive years. Established in 1959 with technical and financial assistance from the erstwhile government of West Germany, IIT Madras is located in Chennai, Tamil Nadu, and operates from a sprawling 600-acre campus that includes extensive aca
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IAS Full Form
IAS stands for Indian Administrative Service, which is the premier civil service of India and forms part of the All India Services along with the Indian Police Service (IPS) and Indian Forest Service (IFoS). IAS officers occupy top administrative positions in the Indian government, serving as district collectors, divisional commissioners, secretaries in central and state governments, and in various policymaking roles that shape governance across the nation. Entry into the IAS is through the h
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MBBS Full Form
MBBS stands for Bachelor of Medicine and Bachelor of Surgery, which is the primary undergraduate degree for aspiring medical doctors in countries following the British medical education system, including India, UK, Australia, and many other nations. Despite being called a "bachelor's" degree, MBBS is actually a professional medical qualification that typically requires 5.5 years to complete in India (5 years of academic study plus 1 year of compulsory rotating internship), equipping graduates
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To Pour Water on Calcium Oxide
Pouring water on calcium oxide (quicklime or CaO) produces a vigorous exothermic reaction that generates calcium hydroxide (slaked lime) and releases substantial heat, sometimes enough to cause the water to boil and produce steam. The chemical equation is: CaO + H₂O → Ca(OH)₂ + Heat. This reaction is highly exothermic, releasing approximately 65 kilojoules of energy per mole of calcium oxide, which means even small amounts can produce noticeable heat. The process is called slaking, and t
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Nagarjuna
Nagarjuna was an influential Indian Buddhist philosopher and monk who lived approximately between 150-250 CE, though exact dates remain debated among historians. He is considered one of the most important figures in Mahayana Buddhism and is credited with founding the Madhyamaka (Middle Way) school of Buddhist philosophy. His most famous work, the Mūlamadhyamakakārikā (Fundamental Verses on the Middle Way), explores the concept of śūnyatā (emptiness), arguing that all phenomena lack inherent e
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How Many States in India
India has 28 states and 8 union territories as of 2024, following the reorganization that created Ladakh and Jammu & Kashmir as separate union territories in 2019. The most recent additions to India's states were Telangana in 2014 (carved out of Andhra Pradesh) and the earlier creation of Uttarakhand, Jharkhand, and Chhattisgarh in 2000. Each state has its own elected government with a Chief Minister and legislative assembly, giving states significant autonomy in matters like education, h
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NDA Party Full Form
The National Democratic Alliance (NDA) is a coalition of political parties in India, with the Bharatiya Janata Party (BJP) serving as its principal constituent and leading force. Formed in 1998 under the leadership of Atal Bihari Vajpayee, the NDA represents a center-right to right-wing political alliance that has governed India for multiple terms, including the current administration. The coalition brings together regional and national parties that share broadly similar ideological positions
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JEE Advanced
JEE Advanced is the second and final stage of the Joint Entrance Examination conducted annually in India for admission to the prestigious Indian Institutes of Technology (IITs) and a few other top engineering institutions. Only the top 250,000 candidates who qualify in JEE Main are eligible to appear for JEE Advanced, making it one of the most competitive and challenging entrance examinations in the world. The exam tests deep conceptual understanding and problem-solving abilities in Physics,
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Kurnool
Kurnool is a historic city in Andhra Pradesh, India, situated on the banks of the Tungabhadra River and serving as the headquarters of Kurnool district. Once the capital of Andhra State from 1953 to 1956 before the formation of Andhra Pradesh, Kurnool holds significant historical and administrative importance in the region. The city lies approximately 200 kilometers from Hyderabad and serves as a major commercial and educational hub in the Rayalaseema region, known for its cotton production,
- GeneralClass 12All
Which One of the Following is a Weak Acid
Weak acids are substances that only partially dissociate or ionize when dissolved in water, releasing fewer hydrogen ions compared to strong acids. Common examples include acetic acid (found in vinegar), carbonic acid (in carbonated beverages), citric acid (in citrus fruits), formic acid, and phosphoric acid. In contrast, strong acids like hydrochloric acid, sulfuric acid, and nitric acid completely dissociate in aqueous solutions. The degree of dissociation is measured by the acid dissociati
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Why Cannot Each Metal React to Its Own Salt
A metal cannot displace itself from its own salt solution because displacement reactions are driven by differences in reactivity between metals—a more reactive metal can displace a less reactive metal from its compound, but a metal cannot be more reactive than itself. This principle is fundamental to understanding the reactivity series and redox chemistry. When you place a metal in a solution of its own salt, both the metal atoms and the metal ions in solution are at chemical equilibriu
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CNG
Compressed Natural Gas (CNG) is natural gas stored under high pressure (typically 200-250 bar) to reduce its volume, making it a practical and cleaner-burning alternative fuel for vehicles and other applications. Composed primarily of methane, CNG produces significantly fewer pollutants than conventional gasoline or diesel—emitting up to 30% less carbon dioxide, 80% fewer carbon monoxide emissions, and virtually no particulate matter. This environmental advantage has driven its adoption
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How Many Calories in an Apple
A medium-sized apple (approximately 182 grams) contains around 95 calories, making it an excellent low-calorie snack choice for weight management and healthy eating. The calorie content varies slightly depending on the apple variety and size—a small apple may have about 77 calories, while a large one can contain up to 116 calories. The natural sugars in apples provide quick energy, while the fiber content (about 4 grams per medium apple) helps you feel satisfied longer, which is why app
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Identify the Correct Statement from the Following
When encountering a multiple-choice question that asks you to identify the correct statement, you're being tested on your ability to distinguish factual accuracy from misleading or false information. This question format appears frequently in competitive exams, educational assessments, and standardized tests where critical thinking and knowledge verification are essential. The key to answering successfully lies in carefully evaluating each statement against established facts, scientific princ
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How many sample papers should be solved before boards?
Students should ideally solve 10 to 15 sample papers per subject before board exams.Sample papers help improve time management and exam confidence.Analyzing mistakes after solving papers is crucial.Quality practice is more important than quantity.