## CLASS XII – PHYSICS Sample Paper II

CLASS XII – PHYSICS Sample Paper Time allowed : 3 hours Max. Marks : 70 General Instructions: All questions are compulsory There are 30 questions in total. Questions 1 to 8 carry one mark each, 9 to 18 carry two marks each, 19 to 27 carry 3 marks each and 28 to 30 carry 5…… Continue reading CLASS XII – PHYSICS Sample Paper II

## Electric Current and flow of electrons

I have read that the FLOW OF ELECTRONS is called electricity. I wanna know that what is meant by flow of electrons? Pleaz answer me…. (Asked Kiruthika) Answer: Electric current is the flow of charges. (Measured as the rate of flow of charges). In conductors electric current is caused by the flow of free electrons. When a potential difference is…… Continue reading Electric Current and flow of electrons

## Potential Difference – misconception

What actually it means when we say “potential difference across..” ? Does it indicate that the somehow the energy level of electrons across it is less than on the other side or is it just the amount of energy consumption across it. If latter is true then in AC we’ve voltages which dont algebraically add […]

## What is the mechanical energy of a bird on top of a moving Ship?

A bird is at rest on d top of a stick of moving ship….!! what is the mechanical energy that exists in the bird ???” – This question was posted by Fatima Answer: The mechanical energy of the bird is both Potential and Kinetic as the bird is at a height with respect to ground …Read the full post

## Dimensions of angle, specific heat, heat, latent heat, frequency, charge, potential difference, resistance.

What are the dimensions of angle,specific heat,heat,latent heat,frequency,charge,potential difference,resistance? Angle does not have any dimension as it is a pure ratio Dimensions of Specific heat  = [M0L2T-2K-1] Heat has the same dimensional formula as that of energy [ML2T-2] Latent heat is the heat energy required to convert unit mass of a substance from one state…… Continue reading Dimensions of angle, specific heat, heat, latent heat, frequency, charge, potential difference, resistance.

## Potential Difference

Pawan Asked “What is meant by potential difference?” Answer: “Potential Difference between two points is the difference in Potential between the two points and is equal to the work done per unit charge ion carrying a positive test charge from one point to another against the electric field and without any acceleration”

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