myclass24
myclass24your class. your pace.
Q&A BANK

every question.
answered.

1,924 answers across CBSE, ICSE, and State boards - Class 1 to 12, every subject.

CBSEICSEState
SUBJECT
CLASS

Filtered results

1,924 TOTAL
MathematicsClass 10CBSE

Why is the number zero so different and mysterious from other numbers?

Zero is the only number that breaks standard mathematical rules in multiple ways:Division by zero is undefined: 5/0 has no valid answer. If 5/0 = x, then 0 × x = 5 — but 0 times anything is always 0, never 5. The operation is a logical impossibility.Zero is neither positive nor negative: Every other number belongs to one category. Z

MathematicsClass 10CBSE

Why does 0 exist if it is nothing?

Zero exists precisely because "nothing" needs to be represented and that representation is not nothing at all.Historical context:Ancient Egypt, Rome, and Greece had no symbol for zero creating enormous problems in calculationThe concept of zero as a number was formally developed in India by Brahmagupta in the 7th century CE, then transmi

MathematicsClass 10CBSE

What is the most uncommon number between 1 and 100?

This has both a psychological and a mathematical answer.Psychologically: When asked to pick a "random" number between 1 and 100, people avoid obvious choices like 1, 10, 50, and 100. Research shows 37 and 73 are the most commonly chosen "random" numbers. This means the truly uncommon choices are the ones people overlook as "too obvious": 1, 2, 99, 100.Mathematically (most distinctive numbers near 100):<li data-list-item-id="e8f9ecf406c4e

MathematicsClass 10CBSE

How do you define a number in mathematics?

A number is a mathematical object used to count, measure, and label. It is an abstract concept representing quantity or position.The major types of numbers (hierarchy from simple to complex):TypeDescriptionExamplesNatural numbers (N)Counting numbers starting from 11, 2, 3, 4, 5...Whole numbers (W)Natural numbers including 0</td

ChemistryClass 10CBSE

What is a chemical reaction?

A chemical reaction is a process in which one or more reactants are converted into one or more products through the breaking and forming of chemical bonds. No atoms are created or destroyed (Law of Conservation of Mass).Reactants → Products Example: 2H₂ + O₂ → 2H₂O (Hydrogen + Oxygen → Water) Types of chemical reactions:TypeDescriptionExample<

ChemistryClass 10CBSE

What is chemistry?

Chemistry is the branch of science that studies matter what it is made of, how its properties arise, how it changes, and how it interacts with other matter and energy.Core branches:BranchFocusOrganic chemistryCarbon-containing compounds; basis of life and pharmaceuticalsInorganic chemistryElements and compounds not primarily based on carbon

BiologyClass 10CBSE

What is photosynthesis, and how does it work?

Photosynthesis is the process by which green plants, algae, and some bacteria use sunlight, water, and carbon dioxide to produce glucose (food) and release oxygen as a byproduct. It is the foundation of almost all food chains on Earth.The overall equation:6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂ Carbon dioxide + Water + Sunlight → Glucose + Oxygen Where it happens: In the chloroplas

BiologyClass 10CBSE

What are cells? What is their structure? What are different types of cells and organelles?

A cell is the smallest structural and functional unit of all living organisms. Robert Hooke first observed cells in 1665 using cork under a microscope.Two fundamental cell types:FeatureProkaryoticEukaryoticNucleusNo membrane-bound nucleusHas a true nucleusSize1–10 micrometers10–100 micrometersOrganism

PhysicsClass 10CBSE

What is light? What are sources of light?

Light is a form of electromagnetic radiation visible to the human eye. It travels in waves and also behaves as particles called photons (wave-particle duality).Properties:Speed: 299,792,458 m/s (≈3 × 10⁸ m/s) in vacuum — the fastest speed in the universeVisible wavelength range: 380 nm (violet) to 700 nm (red)<li data-list-item-id="edbe8

ChemistryClass 10CBSE

What is acid? Give an example of two locally available acidic substances.

An acid is a substance that donates hydrogen ions (H⁺) when dissolved in water, producing a solution with a pH below 7.Properties of acids:Sour taste (safe, dilute acids only)pH less than 7 (neutral water = pH 7)Turns blue litmus paper red<li data-list-item-id="eb0eebebe

PhysicsClass 10CBSE

What is friction?

Friction is the force that resists relative motion between two surfaces in contact. It always acts in the direction opposite to motion or intended motion.Types of friction:TypeDescriptionExampleStatic frictionOpposes motion before an object starts movingPushing a heavy box that does not yet moveKinetic (sliding) frictionActs wh

BiologyClass 10CBSE

What is semen?

Semen is the biological fluid produced by the male reproductive system, released during ejaculation. It serves as the transport medium for sperm cells.Composition:ComponentSourceProportionFunctionSperm cellsTestes2–5%Carry genetic material to fertilize an eggSeminal fluidSeminal vesicles~60–65%<t

BiologyClass 10CBSE

What is tissue?

In biology, a tissue is a group of similar cells that work together to perform a specific function.Cells are the building blocks tissues are the walls built from those blocks.Four main types of animal tissue:Tissue TypeFunctionExamplesEpithelial tissueCovers body surfaces, lines organs, forms glandsSkin, stomach lining, lung lining<t

BiologyClass 10CBSE

What are living things?

Living things (organisms) share seven defining characteristics that distinguish them from non-living matter:Organization: Made of cells; ordered complex structures from molecular to organism levelMetabolism: Carry out chemical reactions to obtain and use energyGr

BiologyClass 10CBSE

What is the order of most important to least important organs in the digestive system?

Ranked by how severely and immediately failure affects survival:RankOrganWhy1Small intestineResponsible for 90%+ of all nutrient absorption; without it, the body starves2LiverProcesses absorbed nutrients, detoxifies blood, produces bile; failure is rapidly fatal3StomachBegins protein digestion and kills pat

BiologyClass 10CBSE

How does the human digestive system work, and what are its main organs?

The digestive system breaks food into molecules small enough for the body to absorb. It uses two types of digestion:Mechanical: Physical breakdown chewing, churningChemical: Enzyme and acid breakdown of proteins, carbohydrates, and fatsThe journey of food:<li data-list-item-id="e54f6b3e1eeff4bc2

GeneralClass 10CBSE

What is a good example of a flowchart of the human digestive system?

FOOD INTAKE | v [MOUTH] - Teeth chew (mechanical digestion) - Saliva adds amylase (begins breaking down starch) | v [PHARYNX / THROAT] - Food swallowed; epiglottis closes the airway | v [ESOPHAGUS] - Muscular tube carries food via peristalsis (wave-like contractions) | v [STOMACH] - Gastric acid (HCl) + pepsin break down proteins - Churning turns food into semi-liquid chyme (2-4 hours) | v [SMALL

GeneralClass 10CBSE

What are the health benefits of frozen mulberry fruit?

Frozen mulberries retain most of the nutritional value of fresh ones freezing preserves nutrients without preservatives or heat processing.What freezing preserves:Vitamin C largely retained if frozen quickly after harvestAnthocyanins and antioxidants well preservedIron and potassi

GeneralClass 10CBSE

What are mulberry fruit's health benefits, usefulness, and its uses?

Mulberries come in black, red, and white varieties. They are among the most nutritionally complete fruits.Nutrients:Vitamin C immune supportIron one of the richest fruit sources of ironVitamin K1 bone health and blood clotting<li data-list-item-id="e491d4a8999a29623338dd36cde

BiologyClass 10CBSE

How many different species of monkey are there? What are the differences between monkeys and humans?

Species count: Approximately 334 (see above).Differences between monkeys and humans:FeatureMonkeysHumansBrain sizeSmaller relative to bodyMuch larger relative to bodyBipedalismWalk on all foursWalk upright on two legsTailMost have tailsNo tailLangua

STILL STUCK?

Get a tutor for just your question.

One-on-one help, verified tutors. Matched within 24 hours.

Get Started →