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Monthly Archives: December 2011

PhysicsWorld reports: Flowing water may exist on Mars!

Images from NASA’s Mars Reconnaissance Orbiter (MRO) reveal that dark, narrow, finger-like structures follow slopes in certain regions of the southern hemisphere of the planet during its summer months. The researchers believe that these could be caused by flowing salt water and say the finding raises the tantalizing prospect that there might be life on Mars.

Read more here
Also Read
Introducing the ‘antimagnet’
Photons tune in and shape up

 

A question from Gravitation.

Prince Patel Asked:

“Sun have high gravitational energy ,then why planets of solar system doesn’t colloid with sun?”

Answer:

“The planets are moving around the sun and the gravitational force is used in providing the necessary centripetal force (The force required by a body to move in a circular path). As long as the planets are in motion, they will not move towards the sun. A similar explanation hold good for moon going around earth also.”

Inspirational Quotes by Great Sceintists

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

Louis Pasteur

Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house.  ~Henri Poincaré,Science and Hypothesis, 1905

The whole of science is nothing more than a refinement of everyday thinking.

  ~Albert Einstein

KVPY 2011 RESULTS PUBLISHED – GET READY FOR INTERVIEW

Congratulations to all KVPY candidates shortlisted for interview for the Year 2011.

List of students shortlisted under Stream SA
List of students shortlisted under Stream SB
List of students shortlisted under Stream SX

 What Next?

The candidates after scrutiny of their documents will be called for interview. The interview will generally assess the candidates personality as well as the inclination towards taking up research as a career.

How to prepare for interview?

Try to be a master of what you say you have learnt; I mean, the portions of  class XI and XII. Give extra attention to the portions you like.

Choose some portions of Physics or Chemistry or Maths or Biology of which you are a fan. Collect as much details of that area including recent research in those fields. Reading the Science Research Publications such as Nature, Nature Physics, New Scientist, Physics Today and the like will help you in this. These magazines are generally available in Public libraries and British Libraries.

You should be able to explain well “Why you want to take up research?

Have more doubts? Your questions and doubts are always welcome.

Previous Question papers of KVPY

KVPY 2011 question papers (SA, SB/SX)

SA Part A (English Version)
SB/SX (English Version)

KVPY 2011 answer keys

SA, SB/SX

HOTS – HIGHER ORDER THINKING SKILL FREE DOWNLOAD

Study Material
 
Class X Study materials (HOTS) –  All Subjects


eng.pdf
hindi.pdf
sanskrit.pdf
sanskrit1.pdf
sanskrit_3.pdf
maths.pdf
science.pdf
sst.pdf

 
 
Class XII Study materials (HOTS) –  Science Subjects
PHYSIC
atomic nuclei-hots8f.pdf
communication.pdf
dual nature of matter.pdf
em wave-hots.pdf
semi-conductor.pdf
unit10-communication.pdf
unit1-electrostatics.pdf
unit2-current.pdf
unit3-mag.pdf
unit4-emi.pdf
unit5-emwave.pdf
unit6-optincs.pdf
unit7-dual.pdf
unit9-semiconductor.pdf
CHEMISTRY
chemistry.pdf
MATHEMATICS
ho-maths.pdf
COMP-Sc AND IP
HOTS-COMP-SCIENCE-XII.pdf
HOTS-XII-I.P.pdf
BIOLOGY
UNIT6.pdf
UNIT7.pdf
UNIT8.pdf
UNIT9.pdf
UNIT10.pdf

Relativity, Black Hole and some doubts

In the model of the big bang I would like to pose the following question. My understanding is that

1. The expansion of the universe is accelerating and

2. The radiation or shock wave to keep the analogy going is something we can measure.

My question is this. While we can rewind the clock to a single moment when the universe was infinity dense how do we know that this was a moment at all. Let me elaborate. As the universe expands could time or space time not also expand and if so than when the big bang occurred is something we cannot measure merely by rewinding the clock. If we are experiencing time at a given rate when the universe is at its current size would time not be being effected by the expansion also and if so would that mean the there was simply no start and no end to the universe? Perhaps the big bang is not as accurate as we may wish and perhaps it is our ability to comprehend that is limited. I propose there is no start or end to the universe it has always and will always be as it, and we, cannot exist without time and as such these two objects or things form a symbiotic relationship with each other. While the universe expands so does time and its effects are reduced in line with its expansion. Does this sound plausible and if not why?

Physics Sample Papers for AISSCE (CBSE Class XII)

You can find more than 50 Sample Papers at http://physics.2lv.in

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