General Q&A for Class 12 · Page 26
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
How to find the adjoint of a matrix?
The adjoint of a matrix, also known as the adjugate, is a matrix that is related to the original matrix and is used in various mathematical operations, including finding the inverse of a matrix. To find the adjoint of a matrix, you can follow these steps: Determine the Matrix of Cofactors: Start by finding the cofactor matrix of the given matrix. To do this, calculate the cofactor of each element in the original matrix. The cofactor of an element in the i-th row and j
- GeneralClass 12All
What is responsible for the present degradation of individual development?
The present degradation of individual development can be attributed to a combination of complex and interconnected factors that vary by context and region. It's important to note that this is a multifaceted issue, and different societies and individuals may experience these factors differently. Here are some key factors that contribute to the degradation of individual development: Economic Inequality: Economic disparities within and between countries can limit access
- GeneralClass 12All
What is PCV in a blood test?
PCV stands for "Packed Cell Volume," and it is a parameter measured in a standard blood test, often included in a complete blood count (CBC) or hematocrit test. PCV is also referred to as hematocrit (Hct) in some regions. PCV represents the volume or proportion of a person's blood that consists of red blood cells (RBCs), expressed as a percentage of the total blood volume. In a blood test, PCV is determined by centrifuging a blood sample in a special tube called a hematocrit tube. The
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What is the role of the brain in reflex action?
The brain plays a crucial role in reflex actions by coordinating and regulating these rapid, involuntary responses to external stimuli. Reflex actions are protective mechanisms that help an organism react quickly to potentially harmful or dangerous situations without requiring conscious thought or decision-making. Here's how the brain is involved in the process: Sensory Input: Reflex actions begin with the detection of a stimulus by sensory receptors in the body, such
- GeneralClass 12All
What is vegetative reproduction?
Vegetative reproduction is a type of asexual reproduction in plants where new individuals or "offspring" are produced from specialized vegetative structures of the parent plant, such as stems, roots, or leaves. Unlike sexual reproduction, which involves the fusion of male and female reproductive cells (gametes) and genetic variation, vegetative reproduction results in offspring that are genetically identical to the parent plant. This process is also known as clonal reproduction. There
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What is shifting cultivation?
Shifting cultivation, also known as slash-and-burn agriculture or swidden farming, is an agricultural practice that has been used by many indigenous and traditional farming communities around the world. It involves a cyclical process of clearing land, planting crops, and then moving to a new plot of land once the soil's fertility has declined. Here are the key steps and characteristics of shifting cultivation: Clearing: The process begins with the clearing of a patch of forest or vege
- GeneralClass 12All
What is cloud computing?
loud computing refers to the delivery of computing services, including storage, processing, networking, databases, analytics, and more, over the internet. Instead of relying on local hardware and software to perform various computing tasks, individuals and organizations can access and use these services via remote servers hosted in data centers operated by cloud service providers. These services are typically paid for on a subscription or pay-as-you-go basis, providing flexibility and scalabi
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What is artificial intelligence?
Artificial Intelligence (AI) refers to the simulation of human intelligence in computers and other machines. It is a broad field of computer science that focuses on creating systems or algorithms that can perform tasks that typically require human intelligence. These tasks include: Reasoning: AI systems can use logic and problem-solving algorithms to make decisions and draw conclusions. Learning: AI algorithms can learn from data and improve their performance over time without
- GeneralClass 12All
What is global warming?
Global warming refers to the long-term increase in Earth's average surface temperature due to human activities, primarily the emission of greenhouse gases into the atmosphere. These greenhouse gases, such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), trap heat from the sun within the Earth's atmosphere, leading to a gradual rise in global temperatures. This phenomenon is often associated with climate change, which encompasses various shifts in climate patterns and weather e
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What is rainwater harvesting?
Rainwater harvesting is a sustainable practice of collecting and storing rainwater for various uses, rather than allowing it to runoff or be wasted. It involves the collection, conveyance, and storage of rainwater from rooftops, land surfaces, or other areas, typically with the goal of using the collected water for irrigation, landscape maintenance, toilet flushing, and other non-potable (non-drinking) purposes. In some cases, rainwater can also be treated and used for potable (drinking) purp
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How to find the inverse of a matrix?
Finding the inverse of a matrix is a fundamental operation in linear algebra. The inverse of a square matrix A, denoted as A⁻¹, is a matrix that, when multiplied by A, results in the identity matrix I (where I is a square matrix with ones on the main diagonal and zeros elsewhere). In other words, if A is invertible, then A * A⁻¹ = I. Here are the steps to find the inverse of a square matrix: Step 1: Check if the Matrix is Invertible (Non-Singular): B
- GeneralClass 12All
How to increase the WBC count?
White blood cell (WBC) count is an essential component of the immune system, and having an appropriate WBC count is crucial for maintaining good health. If your WBC count is low (a condition known as leukopenia), it's essential to identify and address the underlying cause with the guidance of a healthcare professional. Increasing the WBC count often involves treating the root cause of leukopenia. Here are some general tips: Treat Infections: If an infection is the cau
- GeneralClass 12All
How is soil formed?
Soil formation, also known as pedogenesis, is a complex process that occurs over a long period of time, often taking thousands to millions of years. It results from the interaction of various geological, climatic, biological, and chemical factors acting on parent materials (rock or sediment) on the Earth's surface. Here are the key processes and factors involved in soil formation: Weathering: Weathering is the initial step in soil formation. It involves the physical a
- GeneralClass 12All
How many teeth does an adult human have?
An adult human typically has 32 teeth. These teeth can be categorized into four types based on their location and function: Incisors: There are eight incisors in total, four in the upper jaw (maxillary incisors) and four in the lower jaw (mandibular incisors). Incisors are located at the front of the mouth and are used for cutting and biting food. Canines: Adults have four canines, two in the upper jaw (maxillary canines) and two in the lower
- GeneralClass 12All
How far can the human eye see?
The distance that the human eye can see, or the range of human vision, depends on several factors, including the size of the object being observed, lighting conditions, and the visual acuity of the individual. Here are some general guidelines: Visual Acuity: Visual acuity refers to the sharpness or clarity of vision. A person with normal visual acuity (20/20 vision) can typically see small details at a distance of about 20 feet (6 meters). However, this is just a stan
- GeneralClass 12All
How many liver in human body?
The human body has only one liver. The liver is a vital organ located in the upper right side of the abdomen, just below the diaphragm. Despite its singular nature, the liver is a large and complex organ that performs numerous essential functions in the body, including metabolizing nutrients, detoxifying harmful substances, producing bile for digestion, and storing glycogen for energy. Its unique structure and functions make it a crucial organ for maintaining overall health and well-being.</p
- GeneralClass 12All
How to find IQ level?
IQ (Intelligence Quotient) is typically assessed through standardized IQ tests administered by trained professionals, such as psychologists. These tests are designed to measure a person's cognitive abilities, problem-solving skills, logical reasoning, and other aspects of intellectual functioning. Scoring on these tests provides an estimate of an individual's intellectual ability relative to the general population. Here are some key points on how IQ levels are typically determined:</p
- GeneralClass 12All
How to measure height?
Measuring height accurately is important for various purposes, such as tracking growth, determining clothing size, or assessing health. Here are the steps to measure height properly: Equipment Needed: A measuring tape or a ruler (with metric or imperial units, depending on your preference). A flat, level surface against a wall. A pencil or pen to mark the measurement. Steps: Prepare the Area:</p
- GeneralClass 12All
How many litres of blood in the human body?
The average volume of blood in the human body is approximately 4.5 to 6 liters (about 9.5 to 12.5 pints) for adults. However, the total blood volume can vary depending on factors such as a person's age, sex, body size, and overall health. For example: Adult males typically have a higher blood volume than adult females. Infants and children have smaller blood volumes relative to their body size. Blood volume tends to increase with body weight. The blood
- GeneralClass 12All
conjunctivitis how does it spread?
Conjunctivitis, commonly known as "pink eye," can spread through various means, depending on the type of conjunctivitis and the infectious agent involved. There are three primary types of conjunctivitis: viral, bacterial, and allergic. Here's how each type can spread: Viral Conjunctivitis: Viral conjunctivitis is often caused by viruses, such as adenoviruses (the most common cause), enteroviruses, or herpes simplex viruses. It is highly contagious and