General Q&A for Class 12 · Page 16
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Why jute is known as golden fibre?
Jute is often referred to as the "golden fiber" because of its golden brown color and its importance as a cash crop. The name highlights its economic significance and the valuable fiber it produces. Here are a few reasons why jute is called the golden fiber: Natural Color: Jute fibers have a natural golden to brownish color, giving them a distinct and appealing appearance. This color contributes to the nickname "golden fiber." Economic Importance: Jute is a major cash crop in several countrie
- GeneralClass 12All
why is calcium sulphate hemihydrate called plaster of Paris?
Calcium sulfate hemihydrate is commonly known as plaster of Paris due to its historical association with the large deposits of gypsum found near Paris, France. The name "plaster of Paris" has been in use for centuries and is rooted in the historical use of this material in the field of art and construction. The process of making plaster of Paris involves heating gypsum (calcium sulfate dihydrate) to a certain temperature. When gypsum is heated, it undergoes a chemical reaction in whic
- GeneralClass 12All
Why corona cases are increasing in India?
As of my last knowledge update in January 2023, I don't have real-time information on the current situation of COVID-19 in India. The factors influencing the increase in COVID-19 cases are complex and can vary over time. It's important to check the latest updates from reliable sources such as health authorities, government statements, or reputable news outlets for the most recent information. However, there are several general factors that can contribute to an increase in COVID-19 cas
- GeneralClass 12All
Why is milk white?
Milk appears white because of its composition and the way it interacts with light. The color of milk is influenced by the scattering of light and the presence of various compounds in the liquid. Here are the main reasons why milk appears white: Light Scattering: Milk is an emulsion of fat globules dispersed in water, along with dissolved proteins, lactose (milk sugar), minerals, and other components. The fat globules and the particles in milk are similar in size to the wavelen
- GeneralClass 12All
Why H2O is liquid and h2S is gas?
The difference in physical states (liquid or gas) between water (H₂O) and hydrogen sulfide (H₂S) at room temperature and pressure can be attributed to the differences in the strength and type of intermolecular forces acting between their molecules. Hydrogen Bonding: Water (H₂O) is a polar molecule with a bent molecular geometry. The oxygen atom is more electronegative than the hydrogen atoms, creating a partial negative charge on the oxygen and partial positive charges on the hydrogens. This
- GeneralClass 12All
Why steel is more elastic than rubber?
The elastic properties of materials, such as steel and rubber, are determined by their ability to deform under stress and return to their original shape when the stress is removed. Elasticity is often quantified by the material's modulus of elasticity or Young's modulus. While steel is generally considered more elastic than rubber, it's important to note that the nature of their elasticity differs due to the distinct molecular and structural characteristics of each material. Atomic an
- GeneralClass 12All
Why is cheap and affordable credit important for a country's development?
Cheap and affordable credit is crucial for a country's development for several reasons. Access to credit enables individuals, businesses, and governments to invest in various economic activities, fostering growth, innovation, and poverty reduction. Here are key reasons why cheap and affordable credit is important for a country's development: Investment in Productive Activities: Affordable credit allows businesses to invest in productive activities such as expanding operations,
- GeneralClass 12All
Why migraine occurs?
Migraines are a type of headache disorder characterized by recurrent, intense headaches that are often accompanied by other symptoms such as nausea, vomiting, sensitivity to light, and sensitivity to sound. The exact cause of migraines is not fully understood, and they likely result from a combination of genetic, environmental, and neurological factors. Here are some key factors associated with the occurrence of migraines: Genetic Predisposition: There is a strong genetic comp
- GeneralClass 12All
Why is the atmosphere essential for life?
The atmosphere is essential for life on Earth due to its critical roles in providing a habitable environment for living organisms. It is a dynamic and complex mixture of gases that surrounds the planet, and its composition and properties contribute to several key factors that support life. Here are some reasons why the atmosphere is essential for life: Oxygen Supply: The atmosphere contains oxygen, a vital element for the respiration of many organisms, including humans. Oxygen is essential fo
- GeneralClass 12All
Why is mitosis called equational division?
Mitosis is often referred to as "equational division" because the number of chromosomes in the daughter cells is the same as in the parent cell. The term "equational" emphasizes that the genetic material is equally distributed between the daughter cells, and each daughter cell receives a complete and identical set of chromosomes. This is in contrast to meiosis, which is referred to as "reductional division" because it reduces the chromosome number in half. Here's a brief overview of w
- GeneralClass 12All
Why water is liquid at room temperature?
Water is liquid at room temperature (around 20-25 degrees Celsius or 68-77 degrees Fahrenheit) because of its unique molecular structure and the presence of hydrogen bonding. The key factors contributing to the liquid state of water at typical room temperatures include: Polarity of Water Molecules: A water molecule (H₂O) is a polar molecule, meaning it has a partial negative charge near the oxygen atom and partial positive charges near the hydrogen atoms. This polarity results from the unequa
- GeneralClass 12All
Why is the biosphere important for living organisms?
The biosphere is critically important for living organisms because it represents the sum total of all ecosystems on Earth, where life exists and interacts with the physical environment. It encompasses the entire zone of Earth where living organisms are found, including the atmosphere, hydrosphere (water bodies), lithosphere (solid Earth), and the interconnected web of life. The importance of the biosphere for living organisms can be understood through several key factors: Sustaining L
- GeneralClass 12All
Why solid carbon dioxide is called dry ice?
Solid carbon dioxide is commonly known as "dry ice" because it undergoes a unique process called sublimation. Unlike regular ice, which melts into a liquid form at temperatures above its melting point, solid carbon dioxide transitions directly from a solid to a gas without passing through the liquid phase. This sublimation process is what makes it "dry." Here's why solid carbon dioxide is called dry ice: Sublimation: Sublimation is a phase transition in which a substan
- GeneralClass 12All
Why blood is called connective tissue?
Blood is considered a connective tissue due to its structural and functional characteristics that align with the definition of connective tissues. Connective tissues are a diverse group of tissues that provide structural support, connection, and metabolic support to various organs and systems in the body. Blood, although liquid in nature, fits the criteria for a connective tissue. Here's why blood is classified as a connective tissue: Cells Suspended in Matrix: Connective tiss
- GeneralClass 12All
Why does ice float on water?
ce floats on water because it is less dense than liquid water. This property is a result of the unique molecular structure of water and the way water molecules arrange themselves in different states. Molecular Structure of Water: A water molecule (H₂O) consists of two hydrogen atoms and one oxygen atom. The arrangement of these atoms leads to a bent or V-shaped molecular structure. The oxygen atom is more electronegative than hydrogen, creating a polar molecule. This p
- GeneralClass 12All
Why is a sound wave called a longitudinal wave?
A sound wave is called a longitudinal wave because the particles of the medium through which the sound travels oscillate parallel to the direction of the wave propagation. In other words, the displacement of particles in a longitudinal wave is along the same line or axis as the direction of the wave. Here's a breakdown of the characteristics of longitudinal waves, including sound waves: Particle Oscillation: In a longitudinal wave, the particles of the medium (solid, liquid, or gas) move back
- GeneralClass 12All
Why is solid carbon dioxide known as dry ice?
Solid carbon dioxide (CO2) is commonly known as "dry ice" due to its unique physical properties and behavior. The name "dry ice" reflects the fact that, unlike regular ice (frozen water), solid carbon dioxide does not melt into a liquid state at standard atmospheric pressure. Instead, it undergoes a process called sublimation, transitioning directly from a solid to a gas. Here are the key reasons why solid carbon dioxide is called dry ice: Sublimation: Dry ice sublimes, which
- GeneralClass 12All
Why is the ozone layer important?
The ozone layer is crucial for several reasons, and its importance lies in the protection it provides for life on Earth. The ozone layer, located in the Earth's stratosphere, contains a higher concentration of ozone (O₃) molecules compared to other parts of the atmosphere. Here are some key reasons why the ozone layer is important: Ultraviolet (UV) Radiation Absorption: The primary function of the ozone layer is to absorb the majority of the Sun's harmful ultraviolet (UV) radi
- GeneralClass 12All
Why is the pituitary gland called the master gland?
The pituitary gland is often referred to as the "master gland" because it plays a central and crucial role in regulating various physiological processes and controlling the functions of other endocrine glands in the body. It is located at the base of the brain, just below the hypothalamus, and is a key component of the endocrine system. The pituitary gland consists of two main parts: the anterior pituitary (adenohypophysis) and the posterior pituitary (neurohypophysis). Here are some
- GeneralClass 12All
Which solution showed the greatest change in ph why?
It seems like the context or specific solutions you're referring to is missing in your question. The change in pH of a solution can be influenced by various factors, such as the addition of acids, bases, or other chemicals. Without specific information about the solutions and the changes applied, it's challenging to identify which solution showed the greatest change in pH. If you have information about the specific solutions and the substances added to them, you can calculate the chan