## Thursday, April 27, 2017

### Dibrugarh University (BA - 2nd Semester) Question Papers - Mathematics Major (May'2014)

2014
(May)
MATHEMATICS
(Major)
Course: 201
(Matrices, Ordinary Differential Equations, Numerical Analysis)
Full Marks: 80
Pass Marks: 32
Time: 3 hours
The figures in the margin indicate full marks for the questions

1. (a) State True or False: Ifis a non-zero matrix, then rank. 1
(b) Define elementary matrix. Also find the rank of the matrixconsidering. 2
(c) Find the rank of the following matrix reducing it into normal form: 5
Reduce the following matrixto Echelon form and hence finds its rank:
2. (a) Write down the condition under which the system of equationspossesses a unique solution.    1
(b) Show that a characteristic vector of a matrix cannot correspond to more than one characteristic value of.     2
(c) Show that the only real value offor which the following equations have non-zero solution is 6:     3
(d) Show that the following system of equations is consistent and solve them completely: 2+4=6
State Cayley-Hamilton theorem. Show that the matrix
Satisfies Cayley-Hamilton theorem. 1+5=6

(B) Ordinary Differential Equations
(Marks: 30)
3. (a) Write True or False:
“The singular solution of a differential equation in Clairaut’s from contains only one arbitrary constant.” 1
(b) Find the integrating factor of the differential equation. 2
(c) Solve any one: 3
1. , where
(d) Use Wronskian to show that the functionsare linearly independent. Determine the differential equation with these as independent solutions. 4
Or
Show that the Wronskian of the functionsand is non-zero. Can these functions be independent solutions of an ordinary differential equation? If so, determine this differential equation.
4. (a) What is the auxiliary equation of the differential equation. 1
Whereand are constant?
(b) Define linear homogeneous equation. 1
(c) Solve any two: 4x2=8
(d) Solve any two: 5x2=10
(By removing 1st order derivative)
(By changing the independent variable)
(By the method of variation of parameters)

(C) Numerical Analysis
(Marks: 30)
5. (a) State True or False: The bisection method always converges. 1
(b) Write the basic difference between the bisection method and method of false position. 1
(c) Explain the geometrical interpretation of the Newton-Raphson method for solving an algebraic equation.     3