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  • Strike while the iron is hot !
    AskPhysics Blog Feed Dear students, CBSE has given you more time for exams. We have approximately 7 days before the Physics exams. How to use this seven days effectively for a thorough revision is very important. 7-8 days of sleeping is a must. One hour of exercise 1 to 2 hours for break fast lunch […]
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    AskPhysics Blog Feed I was recently narrating the life story of a girl from Dindigul who got married to a police constable at the age of 14. She was not even reached class 10. She became the mother of two kids by the age of 18. During that time she had to accompany her husband […]
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    AskPhysics Blog Feed “The Philosophers who worked in search of the Philosophers’ stone and those set themselves dedicated to find the elixir of life”The works of those in search of the Philosopher’s stone didn’t go in vain, They made the beginning. The beginning itself was so wonderful that anyone who got touched by the idea […]
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    AskPhysics Blog Feed Doubt from AskPhysics.comI have heard the following statements-> 1. Quarks always exist in a group of 2 or 3, and can not stand alone. 2. Protons are made up of 2 up quarks, and 1 down quark. 3. Quantum mechanics allows us to entangle a particle by somehow dividing it into 2(For […]
  • Prepare for Physics oral test too during lockdown
    AskPhysics Blog Feed Plus Two Physics Oral Test series Many schools have started oral questioning also as part of diagnostic and formative assessment. The initiative was … Prepare for Physics oral test too during lockdown The post Prepare for Physics oral test too during lockdown appeared first on Ask Physics.
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    AskPhysics Blog Feed The basic concepts of relativity are explained in a very simplified way that are easy to understood by Mr. Vivek Sawhney in this YouTube Video… The video focuses upon the general discussion on Theory of Relativity….What is the theory of Relativity? What is time dilation and length contraction? SUBSCRIBE to the YouTube […]
  • A numerical problem from motion in 1 Dimension
    AskPhysics Blog Feed A boy plays with a ball on a field surrounded by a fence which has a height of 2.5m . He kicks the ball vertically up from a height of 0.4m with a speed of 14 ms−1. (a) What is the maximum height of the ball above the fence? (b) What is […]

Why don’t the birds perching on high power electric lines do not get an electric shock?

Electric Eel Shock @ Rockit 06

What is an electric shock? It’s a a sudden discharge of electricity through a part of the body.

For a sudden discharge of electricity, the prime need is a potential difference. When the bird perches on an electric line, it is at a high potential, but it is not subjected to a high potential difference between two parts of its body and hence it does not get a shock. The entire body is raised to the same potential as that of the electric line.

So, the electric potential difference is the VILLAIN.

 

 

 

The Exams are near! Start Smart Preparation (Not just hard work!)

Exam are near. CBSE Exams starts from 1 March. The candidates need to be on toes to score well.
Smart work is better than hardwork. Just burning midnight oil alone won’t work.
Nobody plans to fail, but fails to plan. A failure to plan well may result in ultimate failure. So planning the work based on your target is the essential step to start with. So, fix your targets depending upon your abilities.

 

As per the current trend, a student can get 100% score in any subject – even in languages and subjects under humanities.

 

Don’t worry even if you were scoring low marks throughout the year. Start now!
Have a look at the syllabus and previous question papers. Understand the pattern of question paper. Make a plan to score the MAXIMUM. Take guidance from your teachers (or the experts in the field).
Make a time table as per the guidance and stick to the time table.

 

DSC00352

 

Work smart and score well.
All the best!

 

 

 

Questions received via “Ask a Question” section

How to make a radio? Asked Amritansh prasad

 

How many time constant will be elapsed before the power delivered to the battery drops to half of its maximum value? Asked Mrityunjoy

 

Nucleus of an atom consists of neutral neutrons and positively charged protrons… then why do protons not attract neutrons and share charges with them? (+ve charges are supposed to attract neutral & -ve charges,aren’t they? and once they are in contact they share charges!) Asked sree

 

English: Schematic representation of a nucleus...
English: Schematic representation of a nucleus as an ensemble of neutrons and protons (Photo credit: Wikipedia)

 

 

How was your CBSE Class 12 Physics Exam 2013?

How was the Physics Exam today?

Were there questions beyond your comprehension?

Were there questions out of Syllabus?

Post your responses Now!

Quick Revision Study Materials for Class XII

Electrostatics
Current Electricity
Thermoelectricity
Electromagnetics
Electromagnetic Induction
AC Circuits

Magnetism

Ray Optics
Physical Optics
Atomic Physics
Nuclear Physics
Semiconductor Devices
Communication System

 

Electrostatics – One mark and two marks questions for practice

So far we were concentrating on 3 and five marks questions only. Now I think that concentrating on one and two marks questions will further increase the chance of scoring better.

It’s true that just by concentrating on the three marks and five marks questions one can easily score greater than 60% marks. But it is not enough. When you CAN SCORE MORE why should you compromise for less?

Often the one and two marks questions are tricky and twisted. But, when the questions are tricky, there is a greater chance to score. All you need is to apply your commonsense (often complained that it is not so common!) and logical reasoning. The basic facts remain the same however the question maker twist them. So, believe that whatever question asked are based on what you have learnt. But beware!, whatever conclusions you draw must satisfy your commonsense as well as that of the examiner.

So, here are a collection of one mark and two marks questions from ELECTROSTATICS. The straight – forward questions are intentionally avoided.

(more…)

A Problem from Optics – Reflection of light

Convex and concave mirrors have same radii of curvature R. The distance between the mirrors is 2R. At what point on the common optical axis of the mirrors should a point source of light A be placed for the rays to converge at the point A after being reflected first on the convex and then on the concave mirror?

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