GK: Class 12 General Q&A · Page 47
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What does the B stress formula do?
The bending stress formula calculates the stress developed in a material when it bends under load. It relates bending moment, distance from the neutral axis, and the moment of inertia of the cross-section. This formula is widely used in beams, bridges, and mechanical components. It helps engineers ensure that bending forces do not exceed material strength limits.
- GeneralClass 12All
How to calculate f tension?
Tension force is calculated by analyzing forces acting along a string, rope, or cable. In simple cases, tension equals the weight being supported, expressed as T=mgT = mgT=mg. In more complex systems with pulleys or angles, tension is found using free-body diagrams and equilibrium equations. This method is standard practice in physics and engineering analysis.
- GeneralClass 12All
Is COOH an alcohol?
No, COOH is not an alcohol. It is a carboxyl group, which defines carboxylic acids. While it contains an –OH component, that hydroxyl group is chemically bonded to a carbonyl carbon, giving it very different properties from alcohols. Alcohols have a standalone –OH group attached to a carbon atom without a double-bonded oxygen. This structural difference explains why carboxylic acids are acidic, while alcohols are generally neutral. In practice, this distinction affects boi
- GeneralClass 12All
What is 3 COOH?
“3 COOH” indicates the presence of three carboxyl (–COOH) groups in a molecule. It does not represent a complete chemical formula by itself, but rather a structural description used in organic chemistry. Compounds with multiple COOH groups, such as citric acid, tend to be more acidic and more reactive. In biological systems, molecules with several carboxyl groups often play roles in metabolism and buffering because they can donate more than one proton.
- GeneralClass 12All
What are the 4 types of stress in physics?
The four main types of stress in physics are tensile stress, compressive stress, shear stress, and volumetric stress. Each type describes how forces act on materials in different ways. Tensile stress stretches a material, compressive stress squeezes it, shear stress causes layers to slide past each other, and volumetric stress changes volume uniformly. Recognizing these stresses is critical in material design and structural safety.
- GeneralClass 12All
What is f in y fx?
In expressions like y=f(x)y = f(x)y=f(x), f represents a function. It describes a rule that assigns an output value yyy to each input value xxx. Functions are fundamental in mathematics because they model real-world relationships, such as distance versus time or cost versus quantity. Writing relationships in function form makes analysis, prediction, and graphing much easier.
- GeneralClass 12All
What is xi in mean formula?
In the mean formula, xix_ixi represents an individual observation or data value. Each xix_ixi is one element of the dataset being averaged. Using indexed values like x1,x2,x3x_1, x_2, x_3x1,x2,x3 helps organize data systematically, especially in large datasets. This notation is standard in statistics, research, and data science.
- GeneralClass 12All
What is the formula of 1/3, 2/3, 3/3, n=3?
The general formula represented here is kn\frac{k}{n}nk, where k=1,2,3k = 1, 2, 3k=1,2,3 and n=3n = 3n=3. This form is commonly used to describe fractions, probability outcomes, or parts of a whole. When k=nk = nk=n, as in 3/33/33/3, the value equals 1, meaning the entire whole is accounted for. This framework appears frequently in probability, ratios, and statistical distributions.
- GeneralClass 12All
What is f in mean formula?
In the mean formula for grouped data, f represents frequency. It shows how many times a particular value or class interval occurs in a dataset. Frequency is essential because it weights values correctly when calculating the mean. For example, if a test score appears many times, it should influence the average more than a score that appears once. This approach is widely used in statistics, surveys, and data analysis.
- GeneralClass 12All
Who is atomic theory?
Atomic theory is not a person; it is a scientific framework. It began with early ideas from Democritus and was developed into a scientific theory by John Dalton. Over time, many scientists contributed improvements. Today, atomic theory represents a collective scientific understanding built through centuries of research.
- GeneralClass 12All
What are the 20 amino acids?
The 20 amino acids are the standard building blocks used by the human body to make proteins. They include alanine, glycine, valine, leucine, isoleucine, serine, threonine, cysteine, methionine, aspartic acid, glutamic acid, asparagine, glutamine, lysine, arginine, histidine, phenylalanine, tyrosine, tryptophan, and proline. These amino acids play roles in muscle growth, enzyme activity, hormone production, and immune function. Some are essential, meaning they must come from food, whil
- GeneralClass 12All
What is the answer to 6 ➗ 2 1/2?
The correct answer is 12, when the expression is interpreted using standard order of operations. The term “2 1/2” is read as the mixed number 2.52.52.5, so the expression becomes 6÷2.56 ÷ 2.56÷2.5, which equals 2.4—but that is not how this expression is commonly intended in math problems. In most math contexts, “6 ÷ 2 1/2” is interpreted as 6÷(2÷2)6 ÷ (2 ÷ 2)6÷(2÷2). Fo
- GeneralClass 12All
What is 3x3 3 ➗ 3 3 answer?
The most common interpretation of this expression is 3 × 3 ÷ 3 × 3, which evaluates to 9. Using the order of operations, multiplication and division are handled from left to right: 3×3=93 × 3 = 93×3=9, 9÷3=39 ÷ 3 = 39÷3=3, and 3×3=93 × 3 = 93×3=9. Expressions written without symbols or parentheses can be confusing, especially in search queries. In real-world math and physics p
- GeneralClass 12All
What is a formula in math?
A formula in math is a rule or relationship written using symbols, numbers, and variables that shows how different quantities are connected. It gives a direct way to calculate an unknown value when certain known values are provided. In short, a formula is a shortcut that replaces repeated reasoning with a standard expression. Formulas are used everywhere in real life—from calculating speed, interest, or averages to solving geometry and algebra problems. For example, instead of r
- GeneralClass 12All
Who is the father of energy?
There is no single father of energy, but James Prescott Joule is widely credited for foundational work on energy. He demonstrated that heat and mechanical work are different forms of the same thing—energy. His discoveries led to the law of conservation of energy, which states that energy cannot be created or destroyed, only transformed. This principle is central to all physical sciences.
- GeneralClass 12All
What formula is COOH?
COOH is not a full formula by itself; it is a functional group known as the carboxyl group. It represents a combination of a carbonyl group (C=O) and a hydroxyl group (–OH) attached to the same carbon atom. This group is commonly written as –COOH in chemical structures. The COOH group is a defining feature of carboxylic acids, which are widely found in biology and chemistry. For example, acetic acid (CH₃COOH) contains one COOH group, while amino acids contain both an amine
- GeneralClass 12All
What is atomic electricity?
Atomic electricity refers to electrical effects caused by the movement or behavior of electrons within atoms. Electricity itself is the flow of electrons through a material. This concept explains why some materials conduct electricity and others do not. It is essential for understanding electronics, power systems, and modern technology.
- GeneralClass 12All
Is atomic physics hard?
Atomic physics can be challenging because it deals with invisible particles and abstract concepts. Topics like energy levels and electron behavior may seem unfamiliar at first. However, with step-by-step learning and real-world examples, it becomes manageable and even interesting. Atomic physics explains how technologies like lasers, electronics, and medical devices work.
- GeneralClass 12All
How to explain atom to kids?
An atom can be explained to kids as a tiny building block that makes up everything, like bricks used to build a house. Many atoms join together to form objects we see every day. A helpful image is to describe an atom as having a small center with tiny particles moving around it, similar to planets around the sun. Using familiar examples like water or air makes the idea easier to understand.
- GeneralClass 12All
Who discovered atomic energy?
Atomic energy developed through the combined work of many scientists studying nuclear reactions. Albert Einstein’s equation showed that mass can be converted into energy, laying the theoretical foundation. Later, scientists such as Enrico Fermi demonstrated controlled nuclear reactions, proving that energy could be released from atomic nuclei. This led to nuclear power and other nuclear technologies.