CBSE Physics Solved Board Question Papers 2008, 2009, 2010 & 2011 – All versions

Download CBSE Physics Solved Board Question Papers 2008, 2009, 2010 & 2011 – All versions (Delhi, Outside Delhi & Foreign)

The question Papers are in PDF format, all question papers with solution in a single file. So, it may take some time for the download to finish.

CBSE Physics Class 12 Board Question Papers 2008 to 2011 all sets (SETS I, II & III) and versions (DELHI, FOREIGN, OUTSIDE DELHI)

What is the difference between centre of gravity,centroid and centre of mass ?

Centroid is the geometric centre of a plane figure or object

Centroid divides the shape into regions of equal moments.

Centre of mass is the mean location of all masses in a system

Centre of gravity is the point through which the weight of a body acts.

All these will coincide for a plane figure with uniform density and uniform distribution of mass

Where is electricity stored after it is generated but before it is supplied? (Chat Transcript from FaceBook)

Where is electricity stored after it is generated but before it is supplied?
• Mahesh Sable Electrical power cannot be stored and,therefore,power plants must produce power as and when demanded.power stations r connected in parallel hence load is equally distributed,electric Power can be adjusted with help of step up or step down transformers.

• Mathew Abraham Transformer does not increase power

• Chitraja Rajan The demand for electricity varies randomly within a day itself…so there should be something which should be adjusted according to the demand.

• Vishnu Mohan G huge capacitors? i think i read somewhere like this.

• Hi All, the question is very smart, i think electricity stored before generation is stored in Water(DAM), Uranium Rods(Nuclear), HydroCarbons(Coal, GAS). Electricity can only store when it is in Direct Current format like in Batteries, Capacitor(its a very small time to store/release) Well there are many source where we can store electricity. When electricity is in demand then Power generation takes place within huge Alternators, this powers generation takes places in terms of Phase Shift between all the power Houses across the country, if this phase shift is disturb then power grid fails. after this the transformers come into picture so as to reduce Resistance loses.

•
• Kannan Kannan Ps in my little knowledge electricity unable to store continuing process of generater get current
>________________________________

• Chitraja Rajan at the generation side electricity is high ac current ..if it is converted into dc then there should be large containers to store them and also need suitable convertors to convert it in either form every time

• Mathew Abraham In modern generators, there are equipment to control the rate of flow of water and in turn rate of rotation as well as the power generated. SO, it is quite right to say that electricity is generated as and when required. When you switch on a device power generation also increases until it reaches maximum capacity. Thereafter we will get less power. Remember the low voltage we suffer during the evening when the power consumption is maximum a few seconds ago · Like

Download the free suppliment to Physics WOrld online at the following link. This supplement focusses on the challenges in Vacuum and the solutions.

• Vacuum Technology : Basis for innovation and Process Optimization
• Testing Equipment for space
and more articles related to vacuum.

Physics Resources

Astrophysics Science Project: Integrating Research and Education (ASPIRE) offers lessons for learning about the atmosphere, force, gas particles, cosmic rays, kinetic energy, lunar phases, machines, momentum, the night sky, refraction demos (prisms and…  (National Science Foundation)
The Physics Front provides selected resources for teachers of high school physics. Hundreds of lessons, labs, and activities can be found in four categories: conceptual physics, algebra-based physics…  (National Science Foundation)

Physical Sciences Resource Center offers hundreds of annotated lessons, simulations, and resources for teaching topics in the physical sciences, including astronomy, classical mechanics, electricity and magnetism…  (National Science Foundation)

The Elegant Universe: It’s String Theory is a 3-hour miniseries exploring one of the most ambitious theories ever proposed: the “theory of everything.” String theory proposes that the fundamental ingredients of nature are…  (WGBH Educational Foundation, supported by Multiple Agencies)
Physics to Go is a collection of reviewed resources for teaching and learning about astronomy, electricity and magnetism, fluids, light, modern physics, motion and energy, quantum physics, and waves…  (American Physical Society, supported by National Science Foundation)

NSTA: Teaching Objects provides web-based science learning activities for teachers. Activities include simulations, questions, and students’ common misconceptions (with practical ideas for addressing them)…  (Multiple Agencies)
Matter provides video lesson, video clips, and interactive resources for learning about air, atoms, atomic basis of the properties of matter, atomic nucleus, chemical change, chemical…  (Teachers’ Domain, supported by Multiple Agencies)
Motions and Forces provides video clips and interactive resources for learning about electricity and magnetism, forces between objects, gravity, objects in motion, tension and compression, and velocity…  (Teachers’ Domain, supported by Multiple Agencies)

Searching for the Building Blocks of Matter looks at Fermilab’s search for the smallest building blocks of matter. It also describes the accelerator and detectors needed for the discovery of these building blocks (quarks…  (Multiple Agencies)
Windows to the Universe explores the Earth, planets of our solar system, and the universe. It includes images, animations, and data sets, and information about books, movies, scientists, and myths…  (National Aeronautics and Space Administration)
Origins lets us look over the shoulders of scientists and glimpse the often-unseen moments of investigation. Take “virtual field trips” to eight observatories — Arecibo, where…  (National Science Foundation)
CERN, the World’s Largest Particle Accelerator features scientists and machines that explore the universe’s tiniest particles. Follow a proton through the accelerator. Meet scientists at CERN. Hear why…  (National Science Foundation)

Project Links provides 7 web-based modules for teaching advanced math methods, probability and statistics, differential equations, discrete mathematics, linear systems, and calculus…  (Rensselaer Polytechnic Institute, supported by National Science Foundation)
National Science Digital Library provides access to resources in science, technology, engineering, and mathematics education and research. From video clips teaching cell division to simulations demonstrating plate…  (National Science Foundation)

The Particle Adventure introduces, through an interactive adventure tour, the theory of fundamental particles and forces. It also looks at why physicists want to go beyond the Standard Model theory. In…  (Multiple Agencies)

From Stargazers to Starships is a self-contained book-on-the-web course on basic astronomy, Newtonian mechanics, the sun (and associated physics), and spaceflight and spacecraft…  (National Aeronautics and Space Administration)
Citizen Kurchatov: Stalin’s Bombmaker tells the story of a complex, world-class physicist who became the driving force the Soviet Union’s race to develop the atomic and hydrogen bomb…  (Oregon Public Broadcasting, supported by National Endowment for the Humanities)
A Science Odyssey highlights some the most spectacular discoveries in science and technology during the 20th century. The site includes an Educator’s Guide with activities, discussion questions, and…  (WGBH, supported by National Science Foundation)
Decades of Discovery describes 100 important discoveries in energy sciences, nuclear and plasma physics, advanced computing research, and biological and environmental research. Topics include the world’s…  (Department of Energy)

Help for all those who prepare for Science projects.
http://clackhi.nclack.k12.or.us/physics/projects.html
http://www.all-science-fair-projects.com/category56.html
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/projects/proj.html
http://www.iolani.honolulu.hi.us/Departments/Science/Physics/Heyler/pages/projects.htm

Members are requested to post links and articles and your own project ideas as comments to this post. Remember, whatever you post will soon be reflected in twitter at http://twitter.com/cbsephysics

STUDY GUIDES

The following lists are Word files of study guides that describe each subsection of each topic at the Subsidiary Level for the new course. They describe the requirements as set out in the IB Physics Syllabus. Two paper sizes are available, A4 or Letter.

Click Here to go to Hyper Physics; an exclusively free content in Physics for all

Class XI Physics Notes

Students often search for online notes in Physics for Class XI and XII. The following sites will help you.