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Written as per the revised syllabus prescribed by the Maharashtra State Board. of Secondary and Higher Secondary Education Pune,STD XII Sci. Salient Features, Concise coverage of syllabus in Question Answer Format. Covers answers to all Textual Questions and Intext Questions. Includes Solved and Practice Numericals,Includes solved Board Questions from 2013 to 2018. Includes Board Question Papers of 2017 and 2018, Exercise Multiple Choice Questions and Topic test at the end of each. chapter for effective preparation,Printed at Repro Knowledgecast Ltd Mumbai.
Target Publications Pvt Ltd, No part of this book may be reproduced or transmitted in any form or by any means C D ROM Audio Video Cassettes or electronic mechanical. including photocopying recording or by any information storage and retrieval system without permission in writing from the Publisher. P O No 135288,TEID 12885 JUP, In the case of good books the point is not how many of them you can get through but rather how many can get. through to you, Std XII Sci PRECISE PHYSICS I is a compact yet complete guide designed to boost students. confidence and prepare them to face the conspicuous Std XII final exam. This book is specifically aimed at Maharashtra Board students The content of the book is framed in accordance with. Maharashtra State board syllabus and collates each and every important concept in question and answer format. This book has been developed on certain key features as detailed below. Question and Answer are represented in Tabular format wherever needed to correlate between two. concepts Stepwise explanation for specific questions makes it easier to understand. Solved Examples provide step wise solution to various numerical problems This helps students to. understand the application of different concepts and formulae. Solutions to Board Questions along with marking scheme wherever relevant have been included. Notes cover additional bits of relevant information about discussed topic. Formulae are provided in every chapter which are the main tools to tackle numericals. Exercise helps the students to gain insight on the various levels of theory and numercial based questions. Board Questions section contains questions of past board question papers which fall under the new. Multiple Choice Questions and Topic Test assess the students on their range of preparation and the. amount of knowledge of each topic O, The journey to create a complete book is strewn with triumphs failures and near misses If you think we ve. nearly missed something or want to applaud us for our triumphs we d love to hear from you. Please write to us on mail targetpublications org, A book affects eternity one can never tell where its influence stops.
Best of luck to all the aspirants,Yours faithfully. Edition Second,Disclaimer, This reference book is transformative work based on textual contents published by Bureau of Textbook We the publishers are making this reference book which constitutes as fair. use of textual contents which are transformed by adding and elaborating with a view to simplify the same to enable the students to understand memorize and reproduce the same. in examinations, This work is purely inspired upon the course work as prescribed by the Maharashtra State Board of Secondary and Higher Secondary Education Pune Every care has been taken. in the publication of this reference book by the Authors while creating the contents The Authors and the Publishers shall not be responsible for any loss or damages caused to any. person on account of errors or omissions which might have crept in or disagreement of any third party on the point of view expressed in the reference book. reserved with the Publisher for all the contents created by our Authors. No copyright is claimed in the textual contents which are presented as part of fair dealing with a view to provide best supplementary study material for the benefit of students. PAPER PATTERN, There will be one single paper of 70 Marks in Physics. Duration of the paper will be 3 hours,Section A 8 Marks.
This section will contain Multiple Choice Questions and Very Short Answer VSA type of questions. There will be 4 MCQs and 4 VSA type of questions each carrying one mark. Students will have to attempt all these questions,Section B 14 Marks. This section will contain 7 Short Answer SA I type of questions each carrying 2 marks. Internal choice is provided for only one question,Section C 33 Marks. This section will contain 11 Short Answer SA II type of questions each carrying 3 marks. Internal choice is provided for only one question,Section D O. This section will contain 3 Long Answer LA type of questions each carrying 5 marks. Internal choice is provided for each question, Distribution of Marks According to Type of Questions. Type of Questions,MCQ 1 Mark each 4 Marks,VSA 1 Mark each 4 Marks.
SA I 2 Marks each 14 Marks,SA II 3 Marks each 33 Marks. LA 5 Marks each 15 Marks,Sr No Chapter Marks Page No. 1 Circular Motion 04 1,2 Gravitation 03 38,3 Rotational Motion 04 66. 4 Oscillations 05 95,5 Elasticity 03 123,6 Surface Tension 04 150. 7 Wave Motion 03 173,8 Stationary Waves 05 195,9 Kinetic Theory of Gases and Radiation 04 221.
Board Question Paper March 2017 259,Board Question Paper July 2017. Board Question Paper March 2018,Board Question Paper July 2018 265. Note All the Textual questions are represented by mark. All the Intext questions are represented by mark,06 Surface Tension. 6 1 Surface tension on the basis of molecular 6 5 Capillarity and capillary action. theory 6 6 Effect of impurities and temperature on. 6 2 Surface energy surface tension of liquid,6 3 Surface tension. 6 4 Angle of contact, 6 1 Surface tension on the basis of molecular This force is more in solids less in liquids and.
least in gases,Properties, The force of attraction or repulsion acting i These forces do not obey inverse square law. between the molecules of substances is called ii It is a force of very short range about 10 9 m. intermolecular force,Q 1 Define cohesive force,O Q 2 Define adhesive force. What do you mean by cohesive force What do you mean by adhesive force. Feb 13 old course Feb 13 old course, i The force of attraction between two molecules of i The force of attraction between two molecules of. the same substance is called cohesive force This different substances is called adhesive force. property is called cohesion This property of substance is called adhesion. ii It exists in all substances strongest in solids The ii It exists at the liquid solid liquid gas interface. definite shape and rigidity of a solid body is due iii It is weaker than cohesive force. to cohesion iv Examples Sticking of paint on the wall chalk. iii It is stronger than adhesive force particles on blackboard water to the container. iv Examples Force of attraction between two water etc Mark. molecules force of attraction between two,bromine molecules in a container Mark. Q 3 Define the following terms It is of the order of 10 9 m in solids and. i Range of molecular attraction liquids so it is called short range force. Feb 13 old course,ii Sphere of influence, ii Sphere of influence An imaginary sphere drawn with given.
Feb 13 old course molecule as centre and radius equal to. Ans i Range of molecular attraction the molecular range is called the sphere. The maximum distance between two of influence,The molecule is attracted by other. molecules upto which the intermolecular,molecule within a range of sphere of. forces are effective is called the range of influence otherwise it is negligible. molecular attraction 1 Mark,Chapter 06 Surface Tension. Q 4 Define surface film and free surface of surface But number of air molecules in. liquid sphere of influence is very small as,Ans Surface film compared to liquid molecules. A layer of surface of liquid whose thickness is Therefore the resultant cohesive force. equal to molecular range of attraction is acting on the molecule C is maximum in. called surface film downward direction, All the molecules located inside the surface vi Thus all molecules lying within a.
film experience inward attractive force surface film experience a net inward. Free surface of liquid pull which depends upon the relative. Surface of liquid which is in contact with air is number of molecules between lower. called free surface of liquid and upper halves of sphere of. The free surface of liquid behaves as a influence, stretched elastic membrane A free surface vii The surface area is proportional to the. always tries to minimise its surface area number of molecules on the surface To. Q 5 Explain surface tension on the basis of increase the surface area molecules. molecular theory must be brought to the surface from. Ans Molecular theory of surface tension within the liquid For this work must. i Let PQRS Surface film of liquid in a be done against the cohesive forces. This work is stored in the form of,container containing liquid. PQ SR Molecular range potential energy which increases with. ii Now consider three molecules A B and increase in area Liquid has a tendency. C in a liquid in a vessel such that the to have minimum potential energy To. molecule B within R is just below the,molecule A is well inside the liquid the. free surface of liquid and molecule C is,attain minimum potential energy it. tries to reduce the number of molecules,on the surface so as to have minimum.
surface area Thus liquid behaves like,on the free surface as shown in the. figure a stretched elastic membrane,6 2 Surface energy. Q 6 Define and explain the concept of surface,energy State its unit and dimensions. Ans Definition,The extra energy that a liquid surface holds. under isothermal condition is called surface, iii The sphere of influence of the molecule energy.
A is entirely inside the liquid and the Explanation. molecule is surrounded by its nearest i A molecule well within the liquid is. neighbours on all sides Hence A is surrounded by the similar liquid. equally attracted from all sides so that molecules from all sides and hence there. the resultant cohesive force acting on the is no resultant force acting on it. molecule A is zero The molecule A is ii A molecule within surface film is. free to move anywhere within the liquid surrounded by similar liquid molecules. iv For the molecule B a part of its sphere only on one side of the surface. of influence is outside surface This part iii On the other side it may be surrounded. contains air molecules whose number is by air molecules or molecules of the. negligible compared to the number of vapour of the liquid whose density is. molecules in an equal volume of the much less as compared to density of. liquid Therefore the molecule B liquid molecules, experiences a net cohesive force iv Thus there is a resultant inward force. downward on a molecule in the surface film This, v For the molecule C the upper half of the force tries to pull the molecule into the. sphere of influence is outside the liquid liquid,Std XII Sci Precise Physics I. v Molecules are pulled from the surface If F is the force acting on the imaginary line of. layer to the interior of liquid and new length l then surface tension T is given by. molecules from the interior go towards F,the surface film to the empty space T. vi When a molecule is taken from the Explanation, inside to the surface layer work is done i Consider a free surface of liquid in a.
against the inward resultant force This beaker which acts like a stretched. work is stored in the surface of liquid in membrane All the molecules on the. the form of potential energy surface experience a stretching force. vii Potential energy is greater for molecule ii Imagine a straight line AB drawn on the. at the surface film as compared to a free surface of the liquid Molecules of. molecule well inside the liquid liquid along this line will be acted upon. viii This extra potential energy is called the by a force F on each side due to surface. surface energy tension This force per unit length of the. ix Unit J in SI system and erg in C G S line AB measures surface tension. system iii The direction of surface tension is,perpendicular to AB and tangential to. x Dimensions M1L2T 2,liquid surface,Q 7 Define surface energy per unit area State. its units and dimensions,Ans i Potential energy per unit area of the. is called surface energy per unit area,Unit J m2 in SI system and erg cm2 in. CGS system 1 J m2 103 erg cm2,liquid surface under isothermal condition B F.
iii Dimensions M1L0T 2 iv Unit N m or J m2 in SI system and. dyne cm or erg cm2 in CGS system,Q 8 Why do molecules of a liquid lying in the. 1 N m 103 dyne cm,surface film possess extra energy. v Dimensions M1L0T 2,Ans i Molecules lying in the surface film are. surrounded by liquid molecules as well Q 10 Obtain the dimensions of surface tension. as air molecules Force F,Ans i Surface tension T, ii Thus there is a resultant downward force Length l. of cohesion which increases as we move Dimension of force. from bottom to the top of surface film Dimensions of T. Dimension of length,iii To take molecule into surface film from.
anywhere below it some work is to be M1L1T 2,done against the downward force of L. cohesion M1L0T 2, iv This work is stored in the form of P E ii Also surface tension is numerically. The journey to create a complete book is strewn with triumphs failures and near misses If you think we ve nearly missed something or want to applaud us for our triumphs we d love to hear from you Please write to us on mail targetpublications org A book affects eternity one can never tell where its influence stops Best of luck to all the aspirants Yours faithfully Publisher

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