H.C. Verma is a common name among all those preparing for IIT, especially for Physics.
Who is H.C. Verma?
Dr. Harish Chandra Verma joined the Department of Physics, IIT Kanpur in 1994. He obtained his doctoral degree at the Indian Institute of Technology (I.I.T.) Kanpur, working under the supervision of Prof. G.N. Rao. Subsequently he worked as Lecturer and then Reader at Patna University, India.
He is a Nuclear Experimental physicist, whose chief interest lies in Condensed Matter and Materials Applications. Currently, he is working on Nanocrystalline Magnetic Materials and Alloys Systems. Dr. Verma is also interested in Earth Science problems such as meteorites and extinction boundaries. He has authored several books including Concepts of Physics at introductory college level and Quantum Physics at college level. He is presently working on a book on Electromechanics.
A Lecture by Dr. H.C. Verma
Know more about H.C. Verma
As you all know, CBSE has reintroduced investigatory projects in Physics and it will be part of evaluation in Practical exams this year onwards. Here, we would like to answer some of the frequently asked queries. If you have any query please post them as comments to this post.
Q. Will the viva-voce contain questions related to the investigatory project?
A. Yes. The external examiners are instructed to ask questions related to investigatory projects also so as to ascertain the genuineness of the project. The marks assigned to project are mainly based on how you answer the questions related to the project.
Q. Can I do some construction of electronic gadgets as my investigatory project?
A. As the name suggests, the project must be investigatory, ie, you must investigate on some properties or phenomena. Please see the sample projects given by CBSE.
SUGGESTED INVESTIGATORY PROJECTS
1 To study various factors on which the internal resistance/emf of a cell depends.
2. To study the variations, in current flowing, in a circuit containing a LDR, because of a variation.
(a) in the power of the incandescent lamp, used to ‘illuminate’ the LDR. (Keeping all the lamps at a fixed distance).
(b) in the distance of a incandescent lamp, (of fixed power), used to ‘illuminate’ the LDR.
3. To find the refractive indices of (a) water (b) oil (transparent) using a plane mirror, a equiconvex lens, (made from a glass of known refractive index) and an adjustable object needle.
4. To design an appropriate logic gate combinatin for a given truth table.
5. To investigate the relation between the ratio of (i) output and input voltage and
(ii) number of turns in the secondary coil and primary coil of a self designed transformer.
6. To investigate the dependence, of the angle of deviation, on the angle of incidence, using a hollow prism filled, one by one, with different transparent fluids.
7. To estimate the charge induced on each one of the two identical styro foam (or pith) balls suspended in a vertical plane by making use of Coulomb’s law.
8. To set up a common base transistor circuit and to study its input and output characteristic and to calculate its current gain.
9. To study the factor, on which the self inductance, of a coil, depends, by observing the effect of this coil, when put in series with a resistor/(bulb) in a circuit fed up by an a.c. source of adjustable frequency.
10. To construct a switch using a transistor and to draw the graph between the input and output voltage and mark the cut-off, saturation and active regions.
11. To study the earth’s magnetic field using a tangent galvanometer.
Here are some questions which are not properly answered by students during Viva.
- Name the Physical quantities to be kept constant for Ohm’s law to be true.
- State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)
- How can we increase the sensitivity of a potentiometer?
- Define figure of merit of a galvanometer.
- Which has more resistance – a galvanometer or a milliammeter?
- How does an LED emit light?
- What is the difference between an ordinary diode and an LED?
- Define principal axis of a convex lens?
- What happens to the focal length of a concave mirror if it is immersed in water?
- What are the factors affecting the intrernal resistance of a cell?
- What are the difference between primary and secondary cell?
- Why can’t we use a dry cell for starting a car?
- length, area of cross section,temperature
- The potential drop across any length of a conductor of uniform cross section and composition carrying a constant current is directly proportional to the length.
- increasing the length of potentiometer wire, decreasing the current, decreasing the potential gradient
- Current for unit deflection
- The energy released during recombination of electrons and holes across the junction is responsible for the release of light by LED
- In ordinary diode the energy emitted during recombination of electrons and holes is in the invisible region of the em spectrum but in the case of LED, the energy is in the visible region.
- Straight line joining the centres of curvature of the lens..
- The focal length of mirror does not change by changing the medium. Their is a pure geometrical relationship between the radius of curvature and focal length and the relation does not include any term depending on refractive index.
- the nature of electrolyte, the concentration of electrolyte, temperature, distance between electrodes, area of electrodes
- Primary cell cannot be recharged, secondary cells can be recharged; secondary cells have less internal resistance than primary cells.
- Due to the high internal resistance of a dry cell, it won’t be able to provide the current sufficient to start the car
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 and dinner
1 hour for daily routine
SO you can have upto 12 hours for dedicated studying.
“No one plans to fail, but fails to plan”
Since the seven days are for revision and not for first hand study, I am suggesting a DIVIDE AND LEARN policy
We have tom complete one round of revision in five days and the time left can be utilised for the second round or the final revision.
You might have already noted the important topics as per the syllabus already announced by CBSE and as guided by your teachers. If you have not done so far, I am posting it in the next article.
We divide the Physics curriculum into three
- Electricity and Magnetism (Electrostatics, Current electricity, magnetic effects of current, electromagnetic induction, Alternating current)
- Optics (Electromagnetic waves, Ray optics, Wave optics, Optical instruments)
- Modern Physics (Dual nature of matter and radiation, Atoms, Nuclei, Electronics)
Each chapter is to be divided into 1 mark, 2 marks, 3 marks, 4 marks and 5 marks questions.
Learn answers to all the 3 marks and five marks of the three sections in first three days. Divide the answers to questions as well known, difficult and very difficult. Add hints to remember, mnemonics etc along with the answers you prepared, Don’t forget to show the answers prepared by you to your teachers and get it corrected. Discuss the difficult and very difficult portions identified by you with your teacher. He/She may have an easy way to learn it.
Learn the answers to questions with 1 mark and 2 marks of the complete curriculum on the 4 th and fifth day.
The last two days to be used to revise well you what you know and revise the difficult ones. The very difficult ones to be taken up only if you are able to learn without much load to the brain.
Revise all the easy and average questions once again on the night before your exam day without worrying much about the extremely difficult ones.
Go to bed early and ensure that you get minimum 6 hours sleep.
Wake up early and keep cool. Go to exam with a confident mind.
Keep visiting the site.
I will be adding more tips and will be doing the work I suggested as above for your benefit. You can add more questions as comments to the post.
Please feel free to ask your questions in the “Ask a Question” session.
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 to a police parade. She was in the gallery watching the parade. AFter the parade, she was very much impressed. She asked her husband, “Who are those people whom you saluted?”The constable replied, “They are our senior Officers. They are IPS Officers”She said, “I also want IPS. I want to get this salute”Tell me, is this realistic or not? Was it within her reach or not?She went on telling, everyday, “I want that salute, the ceremonial one, in front of lakhs of people, I want IPS”Her husband tried to explain, “You have not even passed matriculation!””I will do anything, but i want that”Understanding the seriousness and the depth of her wishes and dreams, she was allowed to study privately for class 10 which she passed with good marks, then PUC and then degree too.The dreams and the strong determination guidend her.The it was time to prepare for the Civil Services. She was arranged accommodation as paying guest in Chennai. She started attending coaching classes and prepared well. When the time came, she wrote the exam but could not clear the prelims. She tried for the second time, she could not clear .She attempted again for the third time, She could not clear the prelims.Now the family and her husband told, you come back. There is no problem. We can do something else.She said, Give me one more chance. I want to attempt once more.And this was the turning point. She appeared for the fourth time. SHe cleared Prelims. Then the mains and performed well in the interview.And she is now DCP of Mumbai Zone 4N Ambika IPS.
I cite this as the best example of how our determination, our dreams and the incessant efforts to achieve it lead to the fulfilment of our dreams.Just the sight of a ceremonial salute and the strong wish to get it for herself changed everything.This is the type of conspiracy that the universe makes when someone has powerful dreams and becomes ready to put in all effort.
“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 got fascinated and this lead to a group of philosophers setting aside everything and did series of experiments. Though THEY were not successful if finding out a way or means to turn anything to gold, it helped the evolvement and enrichment of the Natural Philosophy. The Alchemists and the work which followed for years helped the development of the present day science, which is better than GOLD. The efforts also resulted in the discovery of many more precious metals other than Gold.
Which supports my theory “If you are not getting the one you are dreaming for, Better ones are awaiting you” The advancement in Science and Technology which capacitated the then philosophers the present scientists to work wonders, all started from the quest for the mysterious substance which could turn anything to Gold. I would like to say this was not a reverie, but it was a challenging and motivational beginning; unless for the sparkling of the GOLD involved in it, the alchemists wouldn’t have so many followers.Similar is the research on Elixir of life. Extensive research is going on REGENERATIVE REPROGRAMMING. We “grow old” and approach death mainly because of the system stops producing new cells. Now In Vivo reprogramming is under research and implementation on animals to increase the lifespan and combat the irreversibility of ageing.Though both the streams started with an apparently impossible concept, but what they resulted were worth more than what they actually wanted.To add, the amount of quality literature that resulted from the concept; aren’t they priceless? How well it is catching the attention and imagination of children and adult alike in Harry Porter etc(Let the discussions go on. Reflections and reactions welcomed)
Doubt from AskPhysics.com
I 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 example, if a proton’s energy is 5 joules, if we split into 2 then sum of both splitted particles will have energy sum of 5 joules.)
Aren’t the statements contradicting each other? Please tell me correct if anyone of my statement is incorrect. Thank You!
Answers invited from all
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 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?
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What is the theory of Relativity and where it’s concepts can be applied?(more…)
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 the time taken to reach the maximum height? (c) How long is the ball above the height of the fence? (d) What is the velocity of the falling ball at the height of the fence? (e) What the acceleration of the ball after 1s ?
v=0 m/s at max height(more…)