Syllabus /

# Mathematics

### Mathematics

Paper-I

Section-A

**Linear Algebra**

Vector, space, linear dependence and independence, subspaces, bases, dimensions. Finite dimensional vector spaces. Matrices, Cayley-Hamiliton theorem, Eigen values and Eigenvectors, matrix of linear transformation, row and column reduction, Echelon form, equivalence, congruence and similarity, reduction to canonical form, rank, orthogonal, symmetrical, skew symmetrical, unitary, hermitian, skew-hermitian forms their Eigen values. Orthogonal and unitary reduction of quadratic and hermitian forms, positive definite quadratic forms.

**Calculus**

Real numbers, limits, continuity, differentiability, mean-value theorems, Taylor’s theorem with remainders, indeterminate forms, maxima and minima, asymptotes. Functions of several variables: continuity, differentiability, partial derivatives, maxima and minima, Lagrange’s method of multipliers, Jacobian. Riemann’s definition of definite integrals, indefinite integrals, infinite and improper integrals, beta and gamma functions. Double and triple integrals (evaluation techniques only). Areas, surface and volumes, centre of gravity.

**Analytic Geometry :**

Cartesian and polar coordinates in two and three dimensions, second degree equations in two and three dimensions, reduction to canonical forms, straight lines, shortest distance between two skew lines, plane, sphere, cone, cylinder, paraboloid, ellipsoid, hyperboloid of one and two sheets and their properties.

#### Section-B

**Ordinary Differential Equations :**

Formulation of differential equations, order and degree, equations of first order and first degree, integrating factor, equations of first order but not of first degree, Clariaut’s equation, singular solution. Higher order linear equations, with constant coefficients, complementary function and particular integral, general solution, EulerCauchy equation. Second order linear equations with variable coefficients, determination of complete solution when one solution is known, method of variation of parameters.

**Dynamics, Statics and Hydrostatics :**

Degree of freedom and constraints, rectilinear motion, simple harmonic motion, motion in a plane, projectiles, constrained motion, work and energy, conservation of energy, motion under impulsive forces, Kepler’s laws, orbits under central forces, motion of varying mass, motion under resistance. Equilibrium of a system of particles, work and potential energy, friction, common

catenary, principle of virtual work, stability of equilibrium, equilibrium of forces in three dimensions. Pressure of heavy fluids, equilibrium of fluids under given system of forces Bernoulli’s equation, centre of pressure, thrust on curved surfaces, equilibrium of floating bodies, stability of equilibrium, metacentre, pressure of gases.

**Vector Analysis :**

Scalar and vector fields, triple, products, differentiation of vector function of a scalar variable, gradient, divergence and curl in cartesian, cylindrical and spherical coordinates and their physical interpretations. Higher order derivatives, vector identities and vector equations. Application to Geometry: Curves in space, curvature and torsion. Serret-Frenet’s formulae, Gauss and Stokes’ theorems, Green’s identities.

#### Paper-II

Section-A

**Algebra:**

Groups, subgroups, normal subgroups, homomorphism of groups quotient groups basic isomorphism theorems, Sylow’s group, permutation groups, Cayley theorem. Rings and ideals, principal ideal domains, unique factorization domains and Euclidean domains. Field extensions, finite fields.

**Real Analysis :**

Real number system, ordered sets, bounds, ordered field, real number system as an ordered field with least upper bound property, Cauchy sequence, completeness, Continuity and uniform continuity of functions, properties of continuous functions on compact sets. Riemann integral, improper integrals, absolute and conditional convergence of series of real and complex terms, rearrangement of series. Uniform convergence, continuity, differentiability and integrability for sequences and series of functions. Differentiation of functions of several variables, change in the order of partial derivatives, implicit function theorem, maxima and minima. Multiple integrals.

**Complex Analysis :**

Analytic function, Cauchy-Riemann equations, Cauchy’s theorem, Cauchy’s integral formula, power series, Taylor’s series, Laurent’s Series, Singularities, Cauchy’s residue theorem, contour integration. Conformal mapping, bilinear transformations.

**Linear Programming :**

Linear programming problems, basic solution, basic feasible solution and optimal solution, graphical method and Simplex method of solutions. Duality. Transportation and assignment problems. Travelling salesman problems.

#### Section-B

**Partial differential equations:**

Curves and surfaces in three dimensions, formulation of partial differential equations, solutions of equations of type dx/p=dy/q=dz/r; orthogonal trajectories, Pfaffian differential equations; partial differential equations of the first order, solution by Cauchy’s method of characteristics; Charpit’s method of solutions, linear partial differential equations of the second order with constant coefficients, equations of vibrating string, heat equation, laplace equation.

**Numerical Analysis and Computer programming:**

Numerical methods: Solution of algebraic and transcendental equations of one variable by bisection, Regula-Falsi and Newton-Raphson methods, solution of system of linear equations by Gaussian elimination and Gauss-Jordan (direct) methods, Gauss-Seidel(iterative) method. Newton’s (Forward and backward) and Lagrange’s method of interpolation.

**Numerical integration:** Simpson’s one-third rule, trapezoidal rule, Gaussian quadrature formula. Numerical solution of ordinary differential equations: Euler and Runge Kuttamethods.

**Computer Programming:** Storage of numbers in Computers, bits, bytes and words, binary system. arithmetic and logical operations on numbers. Bitwise operations. AND, OR , XOR, NOT, and shift/rotate operators. Octal and Hexadecimal Systems. Conversion to and Form decimal Systems. Representation of unsigned integers, signed integers and reals, double precision reals and long integers. Algorithms and flow charts for solving numerical analysis problems. Developing simple programs in Basic for problems involving techniques covered in the numerical analysis.

**Mechanics and Fluid Dynamics :**

Generalised coordinates, constraints, holonomic and non-holonomic, systems. D’Alembert’s principle and Lagrange’ equations, Hamilton equations, moment of intertia, motion of rigid bodies in two dimensions. Equation of continuity, Euler’s equation of motion for inviscid flow, stream-lines, path of a particle, potential flow, two-dimensional and axisymetric motion, sources and sinks, vortex motion, flow past a cylinder and a sphere, method of images. NavierStokes equation for a viscous fluid

Papers III, IV, V and VI.—Any two subjects to be selected from the list of the optional subjects below. Each subject will have two papers.— 200 marks for each paper.

IFoS Preliminary Exam Date – 27th June, 2021 rescheduled to 10th October, 2021-IFoS Main Exam – November, 2021 ( Tentative )

For both writing and marking answers in the OMR sheet [Answer Sheet], candidates must use black ball pen

only.

Download e-Admit card-No Admit Card will be sent by post-Preliminary and Main exam e-Admit card can be downloaded

Indian Forest Service Preliminary exam Fee is Rs.100/ -Main Exam Fee is Rs.100/-Female/SC/ST/Persons with Benchmark Disability Candidates are exempted from paying the exam fee.

Allotment of Centres will be on the “first‐apply‐first allot” basis, and once the capacity of a particular Centre is attained, the same will be frozen. The candidates should note that no request for change of Centre will be entertained.

Paper I General Studies ( Compulsory ) – 100 Questions-Objective Type – multiple choice questions – 200 Marks (2 Hours duration )-Negative Marking-0.33 Marks will be deducted

Civil Services (Preliminary) Examination, separate lists will be prepared for the candidates eligible to appear in the Civil Service (Main)-based on the criterion of minimum qualifying marks of 33% in General Studies Paper-II of Civil Services (Preliminary) Examination

Indian Forest Service Vacancies – 110 (approximately)

Age Limits-Educational Qualification-Number of attempts-Restricted Candidates-Medical and Physical Standards

Last date for filling online Application is 24th March, 2021-withdraw Application-IFoS Main Exam Application form will be called in the month of August, 2021 (Tentative)