Physics Some Natural Phenomena 1-Crust -The uppermost layer of the earth is called Crust. 2-Earth’s plates -The outermost layer of the earth is not in one place.It is fragmented.Each fragment is called a plate.These plates are known as earth’s plates. 3-Earthquake-An earthquake is sudden shaking or trembling of earth … Read more
Physics Stars and the Solar System 1-Sundial -A Clock based on shadows of an object due to Sunlight . 2-Celestial Bodies -The heavenly bodies are known as celestial bodies. 3-Local noon -The time when the shortest shadow occurs is called the local noon time at that place. 4-Dakshinayanam – When the Sun looks … Read more
Physics – Important Points * Colour Blindness was first discovered by Horner (1976) * 3D image is known as Hologram * Human eyes have convex lens * Raman effect is related to Scattering * Heat energy are transmitted as Infra Red Rays * Speed of Light is maximum in Vaccum * Focal Distance of lens … Read more
ATOM Atoms are very small, they are smaller than anything that we can imagine or compare with. Relative Sizes Radii (in m) Example 10–1 Watermelon 10–2 Ant 10–10 Atom of hydrogen 10–8 Molecule of haemoglobin 10–4 Grain of sand 10–9 Molecule of water Dalton was the first scientist to use the symbols for elements in … Read more
Matter – Solution – Important Points , Concept 1- Early Indian philosophers classified matter in the form of five basic elements – the ‘Panch Tatva’– air, earth, fire, sky and water 2-Kelvin is the SI unit of temperature, 00 C =273.16 K. For convenience, we take 00 C = 273 K after rounding off the … Read more
Physics -Concept – Important One Liners * One mega watt hour (MWH) is equal to 3.6 × 109 joule * The Element of an electric heater is made of Nichrome * At – 40o Celsius temperature are the temperature on Celsius and Fahrenheit scales equal * When water is heated from 0o Celsius to 100o … Read more
Important Physics Terminology Ammeter: It is a device used to measure current. Atom: It is the smallest unit of matter that can take part in a chemical reaction and which cannot be broken down chemically into anything simpler. Buoyancy: It is the effect of the upward force (upthrust) on an objective in a fluid. Ballistics: … Read more
Physics 1-Boyle Law holds good for any gas at Low temperature and high pressures 2- The plastic material commonly used for making gear wheels is Nylons 3-When the Barometer reading suddenly dips, it is an indication of Storm 4-The substance which conducts current in the solid state is graphite 5-Holography is a technique of recording … Read more
Physics -Important Terminology A- Heat Heat is a form of energy which flows from hot body to cold body. Units :- 1. Joule (J) (in S.I system) 2. Calorie(cal) (in C.G.S system) B-Specific Heat(S) 1. The specific heat of a substance is the amount of heat required to raise the temperature of unit mass … Read more
Physics -Fundamental Concepts Work, Power and Energy- Its Units and Dimensions Work and Energy are measured in the same units. Power, being the rate at which work is done, is measured in a different unit Quantity and Units/Dimensions Work (Energy) Power Gravitational MKS kg-m Kg-m/sec FPS … Read more