Problems-Questions-Chemistry,Maths,Physics, Feb 15

Chemistry
Alkane

A single substitution of H atom in an alkane of molar mass 72 g mol‾ ¹ by chlorine produces only one product.

a. 2-methylbutane
b. 2,2-dimethylpropane
c. n-pentane
d. n-butane



Mathematics

Chapter: Solutions of Triangles

If in a triangle ABC, sin A, sin B, and sin C are in arithmetic progression, then

a. the altitudes are in A.P.
b. the altitudes in G.P
c. altitudes are in H.P.
d. the altitudes are equal



Physics
Friction

A fireman weighing 80 kg slides down a pole.If the resisting force of friction is a constant 720 N, his acceleration measured in m/sec² is:

a. 0.0
b. 1
c. 0.01
d. 0.11

Questions-Problems - Chemistry - Physics- Mathematics - Feb 15

Chemistry – Chemical equilibrium

The pK_a of acetylsaliclic acd (aspirin) is 3.5. the pH of of gastric juice in the human stomach is about 2 to 3 and the pH in the small intestine is about 8. Aspirin will be

a. unionized in the small intestine and in he stomach.
b. completely ionized in the small intestine and in the stomach.
d. ionized in the stomach and unionized in the small intestine.
d. ionized in the small intestine and almost unionized in the stomach

For answer visit
http://www.orkut.co.in/Main#CommMsgs.aspx?cmm=39291603&tid=5302730322104261825

Physics

Physics Newton’s Laws

A body weighs 8 gm when placed in one pan and 18 gm when placed on the other pan of a false balance. If the beam is horizontal when both the pans are empty, the true weight of the body is

a. 12 gm
b 13 gm
c. 15 gm
d. 15.5

Desire, Determination and Tenacity

Desire the root of all action. Unless there is desire there can be no action.

But to yield results, desire must be translated into determination. A commitment to achieve the desired result must be explicit. In the endeavour there will enough testing moments. One gets tired, exhausted and bored. There has to be generous spirit which will rejuvenate you after every tiresome day. One has to be tenacious and tough. Whether the endeavour stretches or compresses you, you have to be ready to come back to normal state quickly and restart your action.

Come what may, you should not let go of your dreams. don't give up till the last minute of an opportunity.

Source:
Will to Change, by Devdutt Pattnaik, Corporate Dossier, Economic Times, 6 February, 2009, Page 3

February 2009 Study Plan - IIT JEE 2010

Concentrate on board examination revision. Plan to do board examinations exceptionally well. That will give you confidence to prepare well for JEE. Study well and plan to remember things for a long time. You are not studying just for a day of examination. You are studying to remember it for one more year. You have to keep on reminding yourself that point.

It will be good to spare half an hour every day to remember things studied any where from one year back till yesterday randomly. Such an exercise might improve the capability of brain to recollect things in the examination hall suddenly when you have to answer a question.

By April End you must complete study of full XI portion for JEE examination. You must have solved all the problems in H C Verma, R D Sharma and Chemistry Book. Any shortfalls, take up the subjects immediately after school examinations and finish all the problems by April end.

Take up study of XII class portion from May 2009. Wiil give you 8 months to complete the XII portion and related JEE portion. From January 2010 you should be in revision mode for board examination and JEE examination.

Revision for the Board Examinations - From last week of January

Today (24 Jan 2009) Mint paper carried an article titled Tricks from Tutors.
You may find it on www.livemint.com

Some suggestions

If you are academically bright student, the next couple of weeks is the time for you to concentrate on concepts that you have not revised earlier. Don't waste time revisiting waht you alread know.

Weaker students have to revise what they know and perfect that.

If you have to appear for competitive examinations, devote 20% of time to prepare for these examinations until mid-February.

5 R's for success: Reorganize, Revise, Rest, Relax and Reassure

Reorganize: Collect and organize you study material for each retrieval.


Connect the course content to everyday ideas to have a greater recall. Try acronyms, mnemonics, rhymes that associate with the concepts.

I personally advocate somebody in the family asking some questions everyday. When you are not able to answer, revise the topic and natural association between that event and the topic will be there.

First understand and then memorize. If you memorize without understanding, examination anxiety may prevent you from recollecting it.

Practice writing answers and attempt some mock tests. It will tell you how much time you are taking to write answers.

Have a timetable for a day, but be flexible around it. Don't get stressed. You may stretch on a day or slightly relax on another day. Stay refreshed and start everyday with enthusiasm.

IIT JEE 2010 Januar 2009 Study Plan

Chemistry
No new chapter. Revise the old chapters and prepare for board examinations. Study more detailed chemistry books. Dr. Jauhar etc.

Master some chapters in this month. Do JEE questions from old papers.



Mathematics
Integration (Some portion)



Physics

35. Magnetic effect of electric current
36. Permanent magnets
37. Electromagnetic waves

Jan 1 to 10
35. Magnetic effect of electric current

Jan 11 to 20
36. Permanent magnets

Jan 21 to 30
37. Electromagnetic waves

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