Mechanism Behind The Tide Formation
Post on 07,July 2012   7:39 PM
By - Miss. Ankita Jaiswal
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Tides refer to the phenomenon of regular rise and fall of the level of water in the seas and oceans. Water in the oceans and seas rises and falls twice in day. The successive high tides are observed about 12.30 hrs apart. In between the two high tides occur two low tides when the level of water in these water bodies becomes lower. Tides are primarily a result of attraction of the moon. This force is more effective upon water since the mass involved is water and can easily rise under the gravitational pull exerted by the moon.


The tide producing force and the tides themselves vary a great deal in magnitude. In fact it is not only the moon, but the sun also exerts a pull force upon the earth and thus is responsible for the occurrence of tides. However, the tide producing force exerted by moon is far greater owing to its nearness to the earth. High tides are of greater magnitude than normal when the tide producing forces of moon and the sun are acting in such a way that they complement each other. Such tide of higher magnitude is called spring tides. A spring tide occurs of the days of full moon and new moon, when sun earth and moon comes in straight line.Conversly when the tides producing forces of the sun and the moon acts in such a manner that they neutralize each other, the tidal range is much lower than normal. Such tide of lower range is called neap tides. Neap tides are absorbed at the time of the first and the last quarters of the moon when the sun and the moon forms three corners of the triangle and the tide producing forces of the sun and the moon acts at the right angle to each other. Also, the tides can be between 15 and 20 per cent greater or lesser than the average depending upon weather the moon is in perigee or apogee. These are known as perigean or apogean tides. Due to the shorter moon at the time of perigean, the perigean tides are shorter than the apogean tides.

The tide range not only varies time to time but also from place to place. Generally a higher tidal range is observed in the narrow bays and gulfs were large amount water can be pushed into a narrow area by tidal waves originating in the open seas. The large amount of water thus pushed into a narrow inlet or a bay causes a very high tidal range in such areas. Bay and Fundy has the highest tidal range in the world. The Head of the Bay of Bengal and Gulf of Katchch have higher tidal range long the Indian cost. Location experiencing high tidal range is ideal for generating tidal energy.


Moreover, tides also affect the water level of rivers, estuaries, etc. Sometimes the rising water of the seas and oceans may advance upstream in the rivers as a nearly vertical wall several feet high. This is known a tidal bore. The mouth of the river hoogly is wet Bengal is well known for this phenomenon. Although tides simply only a rhythmic rise and fall of water sometimes tides give rise to tidal currents also which carry flow of water from one place to another. This causes stream like flow into or out of the bays and gulfs, especially where the bays etc are connected to the open sea by very narrow inlets.


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by BPSC Examinee

Respected sir i want to know complete syallabus for cdpo

by Prakash Kumar

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by Prania

No change needed B the kind of indians we are from years.mug up ur books clear exams no need to upgrade urself.protest every positive change.be the same not able to cope up with other countries no aptitude no attitude no intellect no english who needs all this to run any country ? indian civil servants needs only theoritical knowledges chapters written in books..dont us ur brains dont change urself.be what ur from many a decades..remove csat hum to ratta maar k hi padenge dimag ka use nahi karernge chahe koi samne aajye hum apni matra bhasa me hi baat karenge.jisko indian languages nahi ati plzz hamare desh me any k pehle sari languages sikh kar aye..kyuki hamare yaha k next any waly sary bueaucrats ko english se parhez hai..angrejo ne bharat chod diya ab angreji bharat chodo....hogai desh ki tarrakki badh gaya desh agy...sary protesters civil servant aspirant jab aap log civil servant ban jaye to ek ek english to hindi translater rakh lena...jarurat to padegi hi kyuki english to ap pad samaj paoge nahi.upsc aap k saath koi nainsaafi nahi hone dega csat hat k rahega...aap karo protest.hum tumhary saath h.hum desh ko apni bhasa me chala k dikhayenge bhale dusry desho se piche choot jaye apni bhasa ko piche nahi chutne denge jai hind jai bharat

by Sushma

Removing the CSAT as its not favaouring some students is not fair. A civil servent irrespective of background should atleast know basics of english which is tested by CSAT.

by Madhavi

Removal of CSAT shall be unfair for garduates from enginnering, medical and management backgrounds. The Humanities people study the UPSC core subjects for their entire graduation period and thereafter as well during preparations, while the rest of the lot hardly studies them after Class X. CSAT was a good way of normalising the trade off between the factual learning by humanities people against aptitude of science graduates.

by Prachi

at ther core of the problem lies the fact that UPSC has also reorieneted its questions towards being more contemporary and analytical. To gain such insights, one has to refer to many sources, most of which are found only in newspapers like The Hindu or from a plethora of websites - all of whcich are in English

Any current topic also is covered in english first; add to that availability of foreign writers' books for theory part of optional subject

In these conditions, even if they remove the CSAT paper 2, i doubt it will benefit vernacul;ar students; also the tendency to mug up is very high in Hindi medium students, but this simply is not working since 2008 as UPSC is now not asking factual questions

by Gaurav

UPSC always keeps in mind that for Civil Services candidates appear from core areas from India. CSAT being an advantage for MBAians, IITians, Engineering students and many more who are good in english and have already prepared for such aptitude exams
found easy to score, as core area candidates are not much familiar with English so they find it diffcult to clear the paper. So, it is good step forward and candidates those who are preparing for exams will get more time to study and revise the topics.

by Karan Jaiswal

i don't understand why regional language people are so worried about CSAT.....English in CSAT is minimum required for being a civil servent.its just of 10th STD.why they are making mess.although its marks is not added in rank ..and aptitude shows your capability and credentials for analytic thoughts....they are just hampering exam ..instead of preparing they they are doing fast and striks....whats wrong with them yar ....:(

by Abhishek

if removed it will be highly unfair for engg. background students, as it will bring in advantage to arts side student who studies subject papers for more than 5 yrs from 11th std. and still engg. students who came new to all these score high as they are intellectual, having good grasping power and aptitude, required for nation to support clan beaurocracy.

by Jai
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