General Q&A for Class 12 · Page 17
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Why gold price is increasing?
The price of gold is influenced by a variety of factors, and its value can fluctuate based on global economic conditions, geopolitical events, and market sentiment. Several reasons can contribute to an increase in the price of gold: Safe-Haven Demand: Gold is often considered a safe-haven asset, and investors tend to turn to gold during times of economic uncertainty, geopolitical tensions, or financial market volatility. The demand for gold as a store of value tends to increase during
- GeneralClass 12All
Why am I coughing so much but not sick?
Frequent coughing without other symptoms of illness can have various causes. Some common reasons for persistent coughing even when you're not sick include: Postnasal Drip: Excess mucus dripping down the back of your throat (postnasal drip) can irritate the throat and trigger coughing. This can be caused by allergies, sinusitis, or irritants in the environment. Gastroesophageal Reflux Disease (GERD): Stomach acid flowing back into the esophagus (acid reflux) can irritate the throat and lead to
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Why blood comes from the nose?
Nosebleeds, also known as epistaxis, can occur for various reasons, and they are usually not a cause for serious concern. The nose contains a rich network of blood vessels that are close to the surface of the nasal lining. Common causes of nosebleeds include: Dry Air: Dry air, especially during the winter months or in dry climates, can cause the nasal lining to become dry and more prone to bleeding. Heating systems and air conditioning can contribute to this dryness. Nasal Tra
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Why am I sleeping too much all of a sudden?
Experiencing a sudden increase in the amount of sleep can be attributed to various factors, and it's important to consider both lifestyle and health-related factors. While occasional variations in sleep patterns are normal, persistent changes may be indicative of an underlying issue. Here are some possible reasons why you might be sleeping too much all of a sudden: Changes in Lifestyle or Routine: A shift in your daily schedule, such as changes in work hours, travel, or daily activiti
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Why farmers are protesting in India?
As of my last knowledge update in January 2022, farmers in India were protesting primarily against three farm laws that were enacted by the government in September 2020. These laws aimed to bring reforms to the agricultural sector by allowing farmers to sell their produce directly to private buyers and enter into contract farming agreements. However, the laws also led to concerns among farmers about the potential dismantling of the traditional agricultural support system and the impact on the
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Why has India a rich heritage of flora and fauna?
ndia has a rich heritage of flora and fauna due to its diverse topography, varied climate, and the presence of different ecosystems. Several factors contribute to the exceptional biodiversity found in India: Geographical Diversity: India is characterized by a diverse range of geographical features, including the Himalayan mountain range in the north, fertile plains, coastal regions, deserts, and plateaus. Each of these regions supports unique ecosystems, fostering a wide variety of pl
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Why are some substances biodegradable and some non biodegradable?
The biodegradability of substances is influenced by their chemical composition and structural characteristics. Whether a substance is biodegradable or non-biodegradable depends on its ability to be broken down by microorganisms (such as bacteria, fungi, and enzymes) into simpler, natural substances over time. Here are key factors that influence the biodegradability of substances: Chemical Structure: The chemical structure of a substance plays a significant role in its biodegradability
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Why do we need to conserve mineral resources?
Conserving mineral resources is crucial for a variety of reasons, encompassing environmental, economic, and societal considerations. Here are some key reasons why the conservation of mineral resources is important: Sustainability: Many mineral resources are finite and non-renewable, meaning they cannot be replaced within human timescales. Conserving these resources ensures their availability for future generations and helps prevent depletion. Economic Stability: Minerals are e
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Why land is considered an important resource?
Land is considered an important resource for various reasons, encompassing economic, environmental, social, and cultural aspects. The significance of land as a resource lies in its multifaceted role and the essential services it provides to human societies. Here are some key reasons why land is considered important: Basis for Agriculture: Land is the fundamental resource for agriculture, providing the space and soil necessary for growing crops and raising livestock. Agricultural land
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Why are forests affected by wars?
Forests are often affected by wars due to various direct and indirect consequences of armed conflicts. The impacts of wars on forests can be severe and wide-ranging, affecting both the environment and the people who depend on forests for their livelihoods. Here are some reasons why forests are affected by wars: Deforestation for Resources: In times of conflict, forests may be exploited for valuable resources, including timber, minerals, and fuelwood. The demand for these resources can
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Why are manure and fertilizers used in fields?
Manure and fertilizers are used in fields to enhance soil fertility, provide essential nutrients to crops, and promote optimal plant growth. Both manure and fertilizers serve as sources of nutrients that may be deficient in the soil, ensuring that crops receive the necessary elements for their development. Here are the reasons why manure and fertilizers are commonly used in agriculture: Nutrient Supply: Manure and fertilizers are rich sources of essential nutrients that plants need fo
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Why sound waves are called mechanical waves?
Sound waves are called mechanical waves because they require a material medium (such as air, water, or solids) to propagate. Mechanical waves are waves that rely on the physical displacement of particles within a medium to transport energy from one location to another. Sound, being a mechanical wave, exhibits the following characteristics: Medium Requirement: Sound waves cannot travel through a vacuum because they need particles to transmit energy. In contrast to electromagnetic waves
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Why sea water is salty?
Seawater is salty primarily due to the dissolved salts it contains, which are derived from various geological and environmental processes. The key contributors to the salinity of seawater include: Weathering of Rocks: The Earth's crust is rich in minerals, and weathering processes break down rocks over time. Rainwater and other forms of precipitation leach minerals from rocks, carrying dissolved ions into rivers and eventually into the oceans. The primary ions contributing to the sali
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Why is water called the universal solvent?
Water is often referred to as the "universal solvent" because of its unique ability to dissolve a wide variety of substances. This exceptional solvent properties of water are attributed to its molecular structure and the way water molecules interact with other molecules. Here are key reasons why water is called the universal solvent: Polarity of Water Molecules: Water molecules are polar, meaning they have a positive and a negative end due to the unequal sharing of electrons between o
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Why mercury is used in thermometers?
Mercury is used in thermometers for several practical reasons: High Thermal Conductivity: Mercury is an excellent conductor of heat. This property allows it to quickly and efficiently respond to temperature changes, providing a rapid and accurate indication of the temperature. The high thermal conductivity of mercury makes it well-suited for applications where a quick response time is essential, such as in thermometers. Wide Temperature Range: Mercury remains in a liquid state
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Why are sound waves called mechanical waves?
Sound waves are classified as mechanical waves because they require a medium (substance) to travel through. Mechanical waves are waves that propagate through a material medium, transferring energy from one point to another by causing particles in the medium to oscillate or vibrate. In the case of sound waves: Medium Requirement: Sound waves cannot travel through a vacuum because they rely on the particles of a material medium to transmit energy. The medium can be a solid, liqu
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Why arteries are thick and elastic?
Arteries are thick and elastic to perform several essential functions in the cardiovascular system, including the efficient transport of blood, maintenance of blood pressure, and distribution of oxygen and nutrients to tissues. The structural characteristics of arteries contribute to their ability to withstand the pressure generated by the pumping action of the heart and to regulate blood flow. Here are the main reasons why arteries are thick and elastic: Pressure Reservoir: Arteries
- GeneralClass 12All
Why do we yawn?
Yawning is a common physiological behavior that is observed in humans and many other vertebrate animals. While the exact cause of yawning is not fully understood, several theories attempt to explain this behavior. Here are some proposed explanations for why we yawn: Oxygen and Carbon Dioxide Regulation: One traditional theory suggests that yawning helps regulate the levels of oxygen and carbon dioxide in the blood. Yawning may facilitate the intake of more oxygen and the removal of ex
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Why are rivers important for the country's economy?
Rivers play a crucial role in a country's economy for a variety of reasons, contributing to economic development, livelihoods, and overall well-being. Here are some key ways in which rivers are important for a country's economy: Water Supply for Agriculture: Rivers serve as a vital source of water for irrigation in agriculture. Many agricultural regions rely on river water to irrigate crops, enabling increased agricultural productivity and supporting food security. Hydropower
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Why do ionic compounds have high melting points?
Ionic compounds generally have high melting points due to the strong electrostatic forces of attraction between positively and negatively charged ions within their crystal lattice structure. Ionic compounds are composed of positively charged ions (cations) and negatively charged ions (anions) held together by electrostatic forces known as ionic bonds. Here are the key factors contributing to the high melting points of ionic compounds: Strong Electrostatic Forces: The attractio