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GeneralClass 10CBSE

What is factorial?

Factorial multiplies a positive whole number by every positive whole number below it, down to 1. Written with an exclamation mark: n!Examples:5! = 5 × 4 × 3 × 2 × 1 = 1204! = 4 × 3 × 2 × 1 = 243! = 3 × 2 × 1 = 61! =&nbsp

GeneralClass 10CBSE

What is an irrational number?

An irrational number cannot be expressed as a fraction of two whole numbers. As a decimal, it goes on forever without repeating any pattern.Contrast with rational numbers: 1/3 = 0.333... goes on forever but repeats (the 3 repeats) making it rational. An irrational number neither terminates nor repeats.Famous examples:Pi (π) = 3.14159265358979... the ra

GeneralClass 10CBSE

What is the notice period? Is it necessary to serve it?

A notice period is the amount of time an employee must continue working after formally resigning, or the time an employer must give before terminating employment. It is a transitional period for both sides.For employees: when you resign, your employment contract typically requires you to continue working for a fixed period (commonly two weeks, one month, or three months) before your last day. You hand over work, train a replacement, and ensure continuity.<strong

GeneralClass 10CBSE

What is the purpose of having a motherboard instead of one large circuit board?

The answer is about flexibility, repairability, upgradeability, and manufacturing practicality.If every component were permanently soldered onto one board:Upgradeability: want a faster processor? You throw away perfectly good RAM, storage, and everything else. Modular sockets let you replace only what you need.Repairability:

GeneralClass 10CBSE

What is the definition of vector graphics?

Vector graphics are images defined by mathematical equations (paths, curves, geometric shapes) rather than a grid of coloured pixels.When you zoom in on a regular photograph (raster/bitmap), you eventually see individual square pixels and the image blurs because a bitmap is a fixed grid.A vector image stores instructions: "draw a circle of radius 50 at position (100, 100) in red." No matter how large you scale it, the computer recalculates and draws a perfect, sharp circle. No p

GeneralClass 10CBSE

If I block someone's number, does it still ring on their end when they call?

Yes on most networks and devices, when you call someone who has blocked you, the call rings briefly on your (the caller's) end before being redirected. You are not told you have been blocked.On iPhone: caller hears one ring, then goes directly to voicemail. The blocked caller can still leave a voicemail, but it goes into a separate "Blocked Messages" folder the recipient never sees unless they choose to look. The recipient gets no notification of the call.<stron

GeneralClass 10CBSE

What is a notarized letter?

A notarized letter is a document certified by a notary public an officially appointed officer whose job is to verify the identity of people signing documents and witness the signing.When you get a letter notarized, the notary:Checks your identity (government-issued photo ID)Watches you sign the document<li data-list-item-id="e32c35057407b2916a3659dd4e471

GeneralClass 10CBSE

As a professional photographer, how have you learnt photography?

Professional photographers universally describe a common path:Shot constantly: Volume builds intuition. The people who improve fastest shoot every single day, even mundane things.Studied deliberately: Not just taking pictures, but analysing them: why does this image work? They studied great photographers Henri Cartier-Bresson, Ansel

GeneralClass 10CBSE

What should be the basic objects to shoot for a beginner photographer?

The best subjects for beginners are ones that do not move, do not require special access, and teach core compositional skills.Still life objects: arrange items on a table fruit, books, a cup, flowers. You control the scene completely and can experiment without time pressure. Teaches you to see light and shadows deliberately.Natural textures

GeneralClass 10CBSE

My laptop has a black horizontal line. How do I fix it?

Step 1Diagnose hardware vs software: connect your laptop to an external monitor.Line appears on external monitor too → problem is with graphics card or driver, not the screenExternal monitor is clear → problem is the laptop's screen, cable, or connectionStep 2If it is a screen/cabl

GeneralClass 10CBSE

What is an index fund?

An index fund tracks a specific market index by holding the same stocks in the same proportions as that index.The S&P 500 is a list of the 500 largest publicly traded US companies, weighted by size. An S&P 500 index fund buys shares in all 500 in the same proportions. When Apple is 7% of the index, the fund holds Apple at 7%.When the index rises, the fund rises by the same amount. The fund does not try to beat the market it matches it. This is called passive investing.</

GeneralClass 10CBSE

What are index funds and why are they a better investment than stocks?

An index fund automatically holds all (or most) stocks in a specific market index like the S&P 500 (500 largest US companies). When those companies grow, the fund grows.Why index funds outperform most stock pickers:Diversification: your money spreads across hundreds or thousands of companies. One failure barely affects you. Individual stocks tie your fate to one company.<li data

GeneralClass 10CBSE

What is a catalytic converter?

A catalytic converter is a device in a vehicle's exhaust system that chemically converts harmful exhaust gases into less harmful substances before they exit the tailpipe.Vehicle engines produce three particularly harmful gases:Carbon monoxide (CO) — poisonousNitrogen oxides (NOx) — contribute to smog and acid rain</

GeneralClass 10CBSE

What does a catalytic converter convert and where does it go?

Input (harmful)Output (less harmful)Carbon monoxide (CO)Carbon dioxide (CO₂)Hydrocarbons (HC)CO₂ + Water (H₂O)Nitrogen oxides (NOx)Nitrogen (N₂) + Oxygen (O₂)Location: sits in the exhaust pipe between the engine and the muffler, positioned close to the engine because it needs to reach ~400°C to

GeneralClass 10CBSE

What is a derivative?

A derivative tells you how fast something is changing at any specific moment.Simple idea: if a car travels 100 km in 2 hours, average speed = 50 km/h. But at some moments it was slower, others faster. A derivative gives the exact speed at any single instant, not just the average.Formally, the derivative of a function f(x) measures the rate of change of f with respect to x. Geometrically, it gives you the slope of the curve at any single point.Posit

GeneralClass 10CBSE

What is torque and horsepower?

Two different but related measurements of engine performance:Torque is the rotational (twisting) force an engine produces measured in Newton-metres (Nm) or pound-feet (lb-ft). High torque means the engine can apply a strong rotational push. Essential for towing heavy loads, accelerating from rest, or driving uphill. Diesel truck engines produce enormous torque.Horsepower is the rate at which the engine delivers that torque how quickly it does work.

GeneralClass 10CBSE

What is entropy?

Entropy is a measure of disorder more precisely, the number of possible arrangements a system can be in.Simple example: imagine all air molecules in a box packed into one corner. That is one very specific arrangement. Release them and they spread through the whole box there are astronomically more ways for molecules to be spread out. The spread-out state has higher entropy.Second Law of Thermodynamics: in any isolated system, entropy naturally i

GeneralClass 10CBSE

What is temperature?

Temperature measures the average kinetic energy of particles (atoms or molecules) in a substance in other words, how fast the particles inside something are moving or vibrating.When you heat a substance, particles get more energy and move faster. Temperature captures that average speed.Three main scales:Celsius: water freezes at 0, boils at 100 used worldwide in daily life<li

GeneralClass 10CBSE

What is the boiling point of water? What is the temperature of superheated steam?

Boiling point of water: 100°C (212°F) at standard atmospheric pressure (1 atm)This changes with pressure: at the top of Mount Everest (~0.33 atm), water boils at ~70°C. In a pressure cooker (above 1 atm), water stays liquid above 100°C why food cooks faster.Superheated steam: steam heated above 100°C while remaining as gas (not allow

GeneralClass 10CBSE

What is time, and how is it defined?

Time is the sequence in which events occur and the measure of intervals between them.Scientific DefinitionThe SI system defines one second as exactly 9,192,631,770 oscillations of radiation from a caesium-133 atom the atomic clock definition.Einstein showed Newton was wrong: time is not absolute it is relative.Time passes more slowly when you move faster (time dil

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