General Q&A for Class 12 · Page 30
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What are the difference between economic growth and development?
Economic growth and economic development are related concepts, but they refer to different aspects of a country's progress. Here are the key differences between economic growth and economic development: Definition: Economic Growth: Economic growth refers to the increase in a country's output of goods and services over time, typically measured by the growth in Gross Domestic Product (GDP). It focuses on the quantitative expansion of a
- GeneralClass 12All
What are the applications of UV spectroscopy?
UV spectroscopy, or ultraviolet-visible spectroscopy, is a widely used technique in various fields for analyzing and characterizing chemical substances. Some of the key applications of UV spectroscopy include: Quantitative Analysis: UV spectroscopy is commonly used for quantitative analysis of substances. It can be employed to determine the concentration of a particular compound in a sample by measuring the absorbance of light at a specific wavelength. <l
- GeneralClass 12All
what is contact force examples?
Contact forces are forces that occur when objects physically come into contact with each other. These forces result from direct interaction between the surfaces of two objects. Here are some common examples of contact forces: Normal Force: The normal force is the force exerted by a surface to support the weight of an object resting on it. For example, when a book is placed on a table, the table exerts an upward normal force on the book.
- GeneralClass 12All
what is the difference between a conductor and an insulator?
Conductors and insulators are two types of materials that differ in their ability to conduct electrical current. The key distinction between them lies in the way they allow or resist the flow of electric charge: Conductor: Definition: A conductor is a material that allows the free flow of electric charge (electrons). Characteristics: Conductors typically have a high density of free electrons that
- GeneralClass 12All
what is non reducing sugar?
Non-reducing sugars are carbohydrates that do not have a free aldehyde or ketone functional group and, therefore, cannot act as reducing agents. In reducing sugars, the presence of a free aldehyde or ketone group allows them to participate in redox reactions, reducing other substances by donating electrons. Non-reducing sugars typically include disaccharides and polysaccharides that lack free aldehyde or ketone groups. Common examples of non-reducing sugars include sucrose and trehalo
- GeneralClass 12All
what is electric flux definition
Electric flux is a concept in electromagnetism that describes the flow of electric field lines through a surface. It is a measure of the electric field's effect on that surface. The electric flux (Φ�ΦE) through a given surface is defined as the product of the electric field (�E) and the component of the surface area (�A) perpendicular to the field. Mathematically, it is expressed as: Φ�=�⋅�⋅cos(�)ΦE=E&sdot
- GeneralClass 12All
what is the powers of the president?
The powers of a president vary depending on the form of government (presidential, parliamentary, etc.) and the specific constitutional provisions of the country in question. In a presidential system, such as that of the United States, the president is the head of state and head of government, and their powers are outlined in the constitution. Here are some common powers associated with the office of a president in a presidential system: Executive Powers:
- GeneralClass 12All
what are the causes of unemployment?
Unemployment can result from various factors, and it is often influenced by a combination of economic, social, and individual factors. Here are some common causes of unemployment: Cyclical Unemployment: Economic downturns or recessions can lead to a decrease in demand for goods and services. As businesses reduce production and cut costs, they may lay off workers, leading to cyclical unemployment. Structural Unemploymen
- GeneralClass 12All
what is log 4 value?
The logarithm of a number is the exponent to which another fixed value, the base, must be raised to produce that number. The logarithm is denoted by "log." If you're referring to the logarithm base 10 (common logarithm), the log base 10 of 4 is written as: log104log104 This means that 10 raised to the power of what gives you 4? Mathematically, it can be expressed as: 10log104=410log104=4 To find the numerical value, you can use a calculator. In this ca
- GeneralClass 12All
what is life span of platelets?
Platelets, also known as thrombocytes, are small cell fragments that play a crucial role in blood clotting (hemostasis). The lifespan of platelets is relatively short compared to many other blood cells. On average, the normal lifespan of platelets is about 8 to 10 days. After this period, they are removed from circulation. The process of platelet production is known as thrombopoiesis, and it occurs in the bone marrow. Platelets are continually produced to maintain a steady supply in t
- GeneralClass 12All
what is fick's law?
Fick's law is a mathematical equation that describes the diffusion of solutes (particles or molecules) through a stationary medium, such as a gas or a liquid. It was first formulated by Adolf Fick, a German physiologist, in the 19th century. Fick's law is fundamental in understanding how substances move from areas of higher concentration to areas of lower concentration. The one-dimensional form of Fick's law is often written as: �=−�����J=−D&d
- GeneralClass 12All
What is CSA of the cube (Curved Surface Area)
The Curved Surface Area (CSA) of a cube refers to the total surface area of its six faces, excluding the areas of the top and bottom faces. Since a cube has all its faces as squares, each face has the same area. The formula for the Curved Surface Area (CSA) of a cube is given by: CSA=4×side CSA=4×side2 where: CSACSA is the curved surface area, sideside is the length of one side of the cube. The factor of 4 in
- GeneralClass 12All
what is saytzeff rule?
Saytzeff's rule, also known as Zaitsev's rule, is a principle in organic chemistry that helps predict the preferred regiochemistry (the position of chemical bonds in relation to atoms in a molecule) of elimination reactions, particularly in alkene formation. The rule is named after the Russian chemist Aleksandr Zaitsev (also spelled Saytzeff or Saytzev), who formulated it in the 19th century. Saytzeff's rule states that, in an elimination reaction (such as dehydrohalogenation), the mo
- GeneralClass 12All
what is a Hindu Temple? name a few famous Hindu Temples.
A Hindu temple is a place of worship dedicated to one or more deities in Hinduism. These temples serve as spiritual and cultural centers for the Hindu community and are designed to facilitate various religious rituals, prayers, and ceremonies. Hindu temples vary in architectural styles, reflecting regional, historical, and cultural influences. Here are a few famous Hindu temples: Angkor Wat (Cambodia): Originally built as a Hindu temple in the 12th cent
- GeneralClass 12All
what is organs systems?
An organ system is a group of organs that work together to perform specific functions and maintain homeostasis within an organism. In multicellular organisms, organ systems are a higher level of organization that allows different organs to collaborate and carry out complex tasks necessary for the survival and functioning of the organism. Here are some key points about organ systems: Organs: An organ is a collection of tissues that work togeth
- GeneralClass 12All
what is interphase?
Interphase is a significant stage in the cell cycle during which a cell prepares for cell division. It is the longest phase of the cell cycle and is not a part of the actual cell division process (mitosis or meiosis). Instead, interphase is a period of cell growth, metabolic activity, and preparation for the upcoming cell division. Interphase can be further divided into three sub-stages: G1 Phase (Gap 1): The cell undergoes rapid growth and m
- GeneralClass 12All
what is Cytokinesis?
Cytokinesis is the process in the cell cycle during which the cytoplasm of a parental cell is divided into two daughter cells. It is the final stage of cell division, following the processes of mitosis (in eukaryotic cells) or meiosis. While mitosis and meiosis are responsible for the division of the nucleus, cytokinesis specifically involves the division of the cellular cytoplasm and other organelles. Key points about cytokinesis include: Timing: Cytok
- GeneralClass 12All
What is Light ? and what are the characteristics of Light?
Nature of Light: Light is a form of electromagnetic radiation that is visible to the human eye. It travels in straight lines and can be represented by rays. Speed of Light: The speed of light in a vacuum is approximately 3 x 10^8 meters per second (m/s). Light travels at different speeds through different media, such as air, water, or glass. Reflection: Reflection is the bo
- GeneralClass 12All
what is probe in biology
Probe in context of biology could mean two different things. A probe could be a sequence of nucleotide, DNA or RNA which could be used to detect the presence of a DNA or an RNA molecule in our sample. In the latest such exercise, we have the COVID RT PCR test which analyses for the presence of DNA corresponding to the viral RNA to detect the presence of virus in the sample. The SARS CoV 2 (being an RNA Virus) RNA is reverse transcribed into a string of DNA. This DNA will have complementarity,
- GeneralClass 12All
what is a synapse in biology
Synapse is the junction between two neurons. Neurons have an expanded part called Cyton. This contains the nucleus and thin projections called dendrites. It is these dendrites that receive the signal. From cyton appears a slender long branch caled axon. At the junction of cyton and axon, the message (changes in the cyton) transforms into biochemical changes across the axon membrane, creating a voltage change. This voltage change is the signal that transcends across the axon to reach the find