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2025 101202

B.Tech 2nd Semester Examination, 2025 (Old Course)

Time 03 Hours
Full Marks 70
Instructions:
  • The marks are indicated in the right-hand margin.
  • There are NINE questions in this paper.
  • Attempt FIVE questions in all.
  • Question No. 1 is compulsory.

Q.1 Choose the correct option/answer the following (Any seven question only):

Q1.1

For the differential equation, $ (x-1) \frac{d^2y}{dx^2} + \cot(\pi x) \frac{dy}{dx} + ( cosec^2 \pi x)y = 0 $ which of the following statement is true?

a)

0 is regular and 1 is irregular

b)

0 is irregular and 1 is regular

c)

Both 0 and 1 are regular

d)

Both 0 and 1 are irregular

Q1.2

Let $ P_n(x) $ be the Legendre polynomial of degree $ n \ge 0 $. Then $ \int_{-1}^{1} P_n(x) dx = 2 $ if n is

a)

0

b)

1

c)

2

d)

None of these

Q1.3

$ \int_{0}^{\pi/2} \sqrt{\pi x} J_{1/2}(2x) dx = k $ then k is

a)

0

b)

1

c)

2

d)

π\sqrt{\pi}

Q1.4

The solution of $ p+q=z $ is

a)

f(xy,ylogz)=0f(xy, y \log z) = 0

b)

f(x+y,y+logz)=0f(x+y, y+\log z) = 0

c)

f(xy,ylogz)=0f(x-y, y-\log z) = 0

d)

f(x/y,y/logz)=0f(x/y, y/\log z) = 0

Q1.5

The complementary function of $ \frac{\partial^2 z}{\partial x^2} - 4 \frac{\partial^2 z}{\partial x \partial y} + 4 \frac{\partial^2 z}{\partial y^2} = x+y $ is

a)

f(y+2x)+xg(y+2x)f(y+2x) + xg(y+2x)

b)

f(y2x)+xg(y2x)f(y-2x) + xg(y-2x)

c)

xf(y+2x)+yg(y+2x)x f(y+2x) + y g(y+2x)

d)

xf(y+2x)yg(y+2x)x f(y+2x) - y g(y+2x)

Q1.6

The transformation $ w = \sin z $ is conformal

a)

at all points

b)

at all points except z=nπ+π2z = n\pi + \frac{\pi}{2}, $ n=0, \pm 1, \pm 2, \dots $

c)

at all points except z=nπ+π2z = n\pi + \frac{\pi}{2}, n=0,1,2,n=0, 1, 2, \dots

d)

at all points except z=nπ+π2z = n\pi + \frac{\pi}{2}, n=1,2,3,n=1, 2, 3, \dots

Q1.7

The value of $ \int_C \frac{3z^2 + 7z + 1}{z-4} dz $, where C is $ 9x^2 + 4y^2 = 36 $ is

a)

2πi2\pi i

b)

0

c)

3πi3\pi i

d)

4πi4\pi i

Q1.8

Newton's iterative formula to find the value of $ \sqrt{N} $ is

a)

xn+1=12(xnN/xn)x_{n+1} = \frac{1}{2} (x_n - N/x_n)

b)

xn+1=12(xnNxn)x_{n+1} = \frac{1}{2} (x_n - Nx_n)

c)

xn+1=12(xn+N/xn)x_{n+1} = \frac{1}{2} (x_n + N/x_n)

d)

xn+1=12(xn+Nxn)x_{n+1} = \frac{1}{2} (x_n + Nx_n)

Q1.9

While applying Simpson's 3/8 rule the number of sub intervals should be

a)

Odd

b)

8

c)

Even

d)

Multiple of 3

Q1.10

In the geometrical meaning of Euler's algorithm, the curve is approximated as a

a)

Straight line

b)

Circle

c)

Parabola

d)

Ellipse

Q.2 Solve both questions :

Q2.1

Solve $ y = 2px + y^2 p^3 $.

Q2.2

Solve $ (px-y)(py+x) = a^2 p $.

Q.3 Solve both questions :

Q3.1

Find the solution of the differential equation $ x^2 y'' - 4xy' + 6y = x^4 \cos x $, $ y(\pi)=0, y'(\pi)=1 $.

Q3.2

State and prove the orthogonal property of Legendre polynomial.

Q.4 Solve both questions :

Q4.1

Find the solution of the following partial differential equation: $ (x^2-yz)p + (y^2-zx)q = z^2-xy $

Q4.2

Find the solution of the following partial differential equation: $ 2z + p^2 + qy + 2y^2 = 0 $

Q.5 Solve both questions :

Q5.1

Find the solution of the partial differential equation $ (D - 5D' - 6)z = 6e^{6x} \log(y+5x) $.

Q5.2

Show that the function $ f(z) = \sqrt{|xy|} $ is not analytic at the origin even though C.R. equations are satisfied thereof.

Q.6 Solve both questions :

Q6.1

Find the Taylor series expansion of the function $ f(z) = \sin z $. Also find the values of $ f^{(2n)}(0) $ and $ f^{(2n-1)}(0) $.

Q6.2

Write the statement of Cauchy Integral formula. Hence, evaluate the integral $ \int_C \frac{z-1}{(z+1)^2(z-2)} dz $ where C is the circle $ |z-i|=2 $.

Q.7 Solve both questions :

Q7.1

Find the value of the integral $ \int_{0}^{\infty} \frac{\cos ax - \cos bx}{x^2} dx $ where $ a, b > 0 $.

Q7.2

Discuss the rate of convergence of Bisection method.

Q.8 Solve both questions :

Q8.1

A third degree polynomial passes through the points (0,1), (1, 1), (2, 1) and (3, -2). Find the polynomial.

Q8.2

Evaluate $ \int_{4}^{5/2} \log x \, dx $ by Simpson's 1/3 rule and Simpson's 3/8 rule, by dividing the range into 6 parts.

Q.9 Solve this question :

Q9.1

Using Euler's modified method, find numerical solution of the differential equation $ \frac{dy}{dx} = x + |\sqrt{y}| $ with $ y(0)=1 $ for $ 0 \le x \le 0.6 $, in steps of 0.2.


2025 OLD 101202

B.Tech 2nd Semester Examination, 2025 (Old Course)

Time 03 Hours
Full Marks 70
Instructions:
  • The marks are indicated in the right-hand margin.
  • There are NINE questions in this paper.
  • Attempt FIVE questions in all.
  • Question No. 1 is compulsory.

Q.1 Choose the correct option/answer the following (Any seven question only):

Q1.1

For the differential equation, $ (x-1) \frac{d^2y}{dx^2} + \cot(\pi x) \frac{dy}{dx} + ( cosec^2 \pi x)y = 0 $ which of the following statement is true?

a)

0 is regular and 1 is irregular

b)

0 is irregular and 1 is regular

c)

Both 0 and 1 are regular

d)

Both 0 and 1 are irregular

Q1.2

Let $ P_n(x) $ be the Legendre polynomial of degree $ n \ge 0 $. Then $ \int_{-1}^{1} P_n(x) dx = 2 $ if n is

a)

0

b)

1

c)

2

d)

None of these

Q1.3

$ \int_{0}^{\pi/2} \sqrt{\pi x} J_{1/2}(2x) dx = k $ then k is

a)

0

b)

1

c)

2

d)

π\sqrt{\pi}

Q1.4

The solution of $ p+q=z $ is

a)

f(xy,ylogz)=0f(xy, y \log z) = 0

b)

f(x+y,y+logz)=0f(x+y, y+\log z) = 0

c)

f(xy,ylogz)=0f(x-y, y-\log z) = 0

d)

f(x/y,y/logz)=0f(x/y, y/\log z) = 0

Q1.5

The complementary function of $ \frac{\partial^2 z}{\partial x^2} - 4 \frac{\partial^2 z}{\partial x \partial y} + 4 \frac{\partial^2 z}{\partial y^2} = x+y $ is

a)

f(y+2x)+xg(y+2x)f(y+2x) + xg(y+2x)

b)

f(y2x)+xg(y2x)f(y-2x) + xg(y-2x)

c)

xf(y+2x)+yg(y+2x)x f(y+2x) + y g(y+2x)

d)

xf(y+2x)yg(y+2x)x f(y+2x) - y g(y+2x)

Q1.6

The transformation $ w = \sin z $ is conformal

a)

at all points

b)

at all points except z=nπ+π2z = n\pi + \frac{\pi}{2}, $ n=0, \pm 1, \pm 2, \dots $

c)

at all points except z=nπ+π2z = n\pi + \frac{\pi}{2}, n=0,1,2,n=0, 1, 2, \dots

d)

at all points except z=nπ+π2z = n\pi + \frac{\pi}{2}, n=1,2,3,n=1, 2, 3, \dots

Q1.7

The value of $ \int_C \frac{3z^2 + 7z + 1}{z-4} dz $, where C is $ 9x^2 + 4y^2 = 36 $ is

a)

2πi2\pi i

b)

0

c)

3πi3\pi i

d)

4πi4\pi i

Q1.8

Newton's iterative formula to find the value of $ \sqrt{N} $ is

a)

xn+1=12(xnN/xn)x_{n+1} = \frac{1}{2} (x_n - N/x_n)

b)

xn+1=12(xnNxn)x_{n+1} = \frac{1}{2} (x_n - Nx_n)

c)

xn+1=12(xn+N/xn)x_{n+1} = \frac{1}{2} (x_n + N/x_n)

d)

xn+1=12(xn+Nxn)x_{n+1} = \frac{1}{2} (x_n + Nx_n)

Q1.9

While applying Simpson's 3/8 rule the number of sub intervals should be

a)

Odd

b)

8

c)

Even

d)

Multiple of 3

Q1.10

In the geometrical meaning of Euler's algorithm, the curve is approximated as a

a)

Straight line

b)

Circle

c)

Parabola

d)

Ellipse

Q.2 Solve both questions :

Q2.1

Solve $ y = 2px + y^2 p^3 $.

Q2.2

Solve $ (px-y)(py+x) = a^2 p $.

Q.3 Solve both questions :

Q3.1

Find the solution of the differential equation $ x^2 y'' - 4xy' + 6y = x^4 \cos x $, $ y(\pi)=0, y'(\pi)=1 $.

Q3.2

State and prove the orthogonal property of Legendre polynomial.

Q.4 Solve both questions :

Q4.1

Find the solution of the following partial differential equation: $ (x^2-yz)p + (y^2-zx)q = z^2-xy $

Q4.2

Find the solution of the following partial differential equation: $ 2z + p^2 + qy + 2y^2 = 0 $

Q.5 Solve both questions :

Q5.1

Find the solution of the partial differential equation $ (D - 5D' - 6)z = 6e^{6x} \log(y+5x) $.

Q5.2

Show that the function $ f(z) = \sqrt{|xy|} $ is not analytic at the origin even though C.R. equations are satisfied thereof.

Q.6 Solve both questions :

Q6.1

Find the Taylor series expansion of the function $ f(z) = \sin z $. Also find the values of $ f^{(2n)}(0) $ and $ f^{(2n-1)}(0) $.

Q6.2

Write the statement of Cauchy Integral formula. Hence, evaluate the integral $ \int_C \frac{z-1}{(z+1)^2(z-2)} dz $ where C is the circle $ |z-i|=2 $.

Q.7 Solve both questions :

Q7.1

Find the value of the integral $ \int_{0}^{\infty} \frac{\cos ax - \cos bx}{x^2} dx $ where $ a, b > 0 $.

Q7.2

Discuss the rate of convergence of Bisection method.

Q.8 Solve both questions :

Q8.1

A third degree polynomial passes through the points (0,1), (1, 1), (2, 1) and (3, -2). Find the polynomial.

Q8.2

Evaluate $ \int_{4}^{5/2} \log x \, dx $ by Simpson's 1/3 rule and Simpson's 3/8 rule, by dividing the range into 6 parts.

Q.9 Solve this question :

Q9.1

Using Euler's modified method, find numerical solution of the differential equation $ \frac{dy}{dx} = x + |\sqrt{y}| $ with $ y(0)=1 $ for $ 0 \le x \le 0.6 $, in steps of 0.2.


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