Proportionality relation in electric power

Power is directly proportional as well as inversely proportional by two formulae.How does one justify? P=V2/R as well as p=I2 R.   Answer: This means that for a given current, (i.e, when current is kept constant) Power is directly proportional to resistance. eg, when a number of appliances are connected in series, the same current…… Continue reading Proportionality relation in electric power

An idea shared by Eddie on speed of light barrier

If 24 lights in a series around a circle are wired so that each one switches on as soon as it “sees” the one next to it go on, and switches off as soon as it “sees” the one next to it go off, will the pattern of lights revolve around the circle at a […]

A numerical problem on Drift velocity

Two conducting wires X and Y of same diameter but different materials are joined in series across a battery . if the number density of electrons in X is twice that in Y . Find the ratio of drift velocity of electrons in the two wires. (Adithya Singh asked this) Incoming search terms:i want to […]

Prepare for Science Quizzes online

We are starting a series of quizzes to enable the students to practice for online quizzes. Take the sample quiz below for getting an idea on how the quizzes will be coming. If you like it, let us know. Post your reactions as comment to this post. Based on the popularity, we will be adding […]

you are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.?

You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew Answer: If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. […]

MODEL QUESTION PAPER FOR AISSCE 2008

PHYSICS TIME 3 HRS                                    MAX MARKS: 70 GENERAL INSTRUCTIONS: All questions are compulsory. There are 30 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 18 carry 2 marks each, questions 19 to 27 carry 3 marks each and questions 28 to 30 carry 5 marks each. There is no…… Continue reading MODEL QUESTION PAPER FOR AISSCE 2008

Commonly asked questions for AISSE (CLASS X CBSE) Physics (Set – 1)

(Collected from Previous Board Question Papers and CBSE Sample Papers andGuess Papers made by experienced teachers) Where does centre of curvature of a spherical mirror lie? Name two important properties of a magnet. How is 1 ohm related to ampere and volt? Draw neat ray diagrams to illustrate the formation of images due to a beam of light incident…… Continue reading Commonly asked questions for AISSE (CLASS X CBSE) Physics (Set – 1)