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Combined Defence Service


About CDS I and II

Combined Defence Services I  and II are no two different tiers of exam.UPSC conducts CDS exam twice in an year.CDS I is conducted during the start of the year and and CDS II is usually conducted  to the end of the year.

CDS Notification

Combined Defence Services notifications are usually released one to two month prior to the exam date. Notifications are published by UPSC site during the months of November and August every year.

CDS Application mode

Applications are invited from candidates online through the UPSC site. Candidates must log on to the UPSC site to apply online for Combined Defense Exam.

CDS Age Limit

Age limits for Combined Defence Services are :-

  •  Indian Military Academy(IMA)-19-23 yrs
  •  Indian Naval Academy(INA)-19-22yrs
  • Air Force Academy(AFA)-19-23 yrs
  • Officer’s Training Academy(SSC Course for Men)-19 -25yrs
  • Officer’s Training  Academy(SSC Course for Women, Non-Technical Course)-19-25 yrs

Combined Defence Service Educational Qualification

  • Indian Military Academy-   Degree from a recognized University
  • Indian Naval Academy-Bachelor of Engineering
  • Air Force Academy- Degree from a recognized university with Physics and Mathematics at 10+2 level or Bachelor of Engineering
  • Officer’s Training Academy(SSC Course for men)-Degree from a recognized university
  • Officer’s Training Academy(SSC Course for women)-Degree from a recognized University

Combined Defence Service  Exam Fee

Candidates (excepting Female/SC/ST candidates who are exempted from payment of fee) are required to pay a fee of Rs. 200/- (Rupees Two Hundred Only) either by paying using the Challan or by using online payment.

Combined Defence Service Dates 2017(CDS II)

Date for release of notification

9TH August,2017

Last date for submission of applications

8th September,2017(Friday)till 6:00pm

Date of Examination:

19th November,2017

Combined Defence Service Exam pattern

For admission to the Indian Military Academy, Indian Naval Academy and Airforce Academy:-



Max Marks




General Knowledge







For admission to the Officer’s Training Academy:-



Max marks




General Knowledge



 Combined Defence Service Exam Syllabus 


The question paper will be designed to test the candidate’s understanding of English and workman like use of words.

General Knowledge

General Knowledge including knowledge of current events and of such matters of everyday observation and experience in their scientific aspects as may be expected of an educated person who has not made a special duty of any scientific subject.

Elementary Mathematics

Arithmetic:- Number System—Natural numbers, Integers, Rational and Real numbers. Fundamental operations, addition, substraction, multiplication, division, Square roots, Decimal fractions. Unitary method, time and distance, time and work, percentages, applications to simple and compound interest, profit and loss, ratio and proportion, variation. Elementary Number Theory—Division algorithm. Prime and composite numbers. Tests of divisibility by 2, 3, 4, 5, 9 and 11. Multiples and factors. Factorisation Theorem. H.C.F. and L.C.M. Euclidean algorithm. Logarithms to base 10, laws of logarithms, use of logarithmic tables.

Algebra:-Basic operations,remainder theorem,simple factors,LCM,HCF,Theory of Polynomials,solutions of quadratic operations,relation between its roots and coefficients (only real roots to be considered.)Simultaneous linear equations   in two unknowns –analytical and graphical solutions. Simultaneous linear equations in two variables and solutions.Practical problems leading to two simultaneous linear equations or in equations in two variables or quadratic equations in one variable and their solutions .Set language and set notations ,rational expressions and conditional identities,Laws of indices.


Sine ×, cosine ×, Tangent × when 0° < × < 90° Values of sin ×, cos × and tan ×, for × = 0°, 30°, 45°, 60° and 90°

Simple trigonometric identities ,use of trigonometric tables ,simple cases of heights and distance


Lines and Angles,Plane and plane figures. Theorems on i)Properties at angles on a point ii)Parallel Lines iii)sides and angles of a triangle iv)Congruency of triangles v)Similar Triangles)Concurrence of median and altitude vii)Properties of angles, sides and diagonals of a parallelogram ,rectangle and square viii)Circles and its properties including tangents and normals ix)loci


Areas of squares,rectangles,parallelograms,triangle and circle.Areas of figures which can be split into figures (Field Book),surface area and volume of cuboids ,lateral surface and volume of right circular cones and cylinders ,surface area and volume of spheres.


Collection and Tabulation of statistical data,graphical representation frequency polygons,histograms,barcharts,pie charts etc.  Measures of central tendency.

CDS Intelligence and Personality Test

After the written exam candidates are made to appear for a Intelligence and Personality test .The test are conducted as follows:-

i)Stage I comprises of Officer Intelligence Rating(OIR) tests are picture perception description test (PP&DT).The candidates will be short listed based on combination of performance in OIR test and PP&DT.

II)Stage II comprises of interview,group testing officer tasks,psychology tests and the conference .These tests are conducted over 4 days.

The personality of candidate is assessed by three different assessors the interviewing officer ,group testing officer and the psychologist.

 Centers of Examination

Agartala, Ahemadabad, Aizwal, Allahabad, Bengaluru, Bhopal, Bareeilly, Chandigarh, Chennai, Cuttack, Dehradun, Delhi, Darwad, Dispur, Gangtok, Hyderabad, Imphal, Itanagar, Jaipur, Jammu, Jorhat, Kochi, Kohima, Kolakatta, Lucknow, Madurai, Mumbai, Nagpur, Panaji(Goa), Patna, PortBlair, Raipur, Ranchi, Sambalpur, Shillong, Shimla, Srinagar, Trivandrum, Tirupati, Udaipur and Vishakhapatnam.