2021 102102

B.Tech 1st Semester Exam., 2021

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 answer (any seven) :

Q1.1

If $ Y = \int_0^a t^4 e^{-2t^2} dt $, then the value of $ Y $ is

a)

2π64\frac{\sqrt{2\pi}}{64}

b)

3π64\frac{3\sqrt{\pi}}{64}

c)

52π64\frac{5\sqrt{2\pi}}{64}

d)

32π64\frac{3\sqrt{2\pi}}{64}

Q1.2

The maximum area of a sector whose perimeter is $ k $ is given by

a)

k216\frac{k^2}{16}

b)

k28\frac{k^2}{8}

c)

k24\frac{k^2}{4}

d)

k21\frac{k^2}{1}

Q1.3

The function $ f(x) = \begin{cases} x^2, & 0 \leq x \leq \frac{1}{2} \\ x, & \frac{1}{2} < x \leq 1 \end{cases} $, then $ \lim_{x \to \frac{1}{2}} f(x) $

a)

has the value 12\frac{1}{2}

b)

has the value 1

c)

has the value 2

d)

does not exist

Q1.4

If $ \alpha, \beta $ are the roots of the equation $ ax^2 + bx + c = 0 $, then $ \lim_{x \to \alpha} \frac{1 - \cos(\alpha x^2 + bx + c)}{(x - \alpha)^2} $ is equal to

a)

a22(αβ)2\frac{a^2}{2} (\alpha - \beta)^2

b)

a22(αβ)2-\frac{a^2}{2} (\alpha - \beta)^2

c)

a22(αβ)2\frac{a^2}{2} (\alpha - \beta)^2

d)

0

Q1.5

The series $ x - \frac{x^2}{2} + \frac{x^3}{3} - \frac{x^4}{4} + ... $ converges for

a)

(-1 &lt; x \leq 1)

b)

|x| &lt; 1 only

c)

x1|x| \leq 1

d)

all real values of xx

Q1.6

If $ u_n = \sqrt{n+1} - \sqrt{n}, \quad v_n = \sqrt{n^4 + 1} - n^2 $, then

a)

n=1un\sum_{n=1}^{\infty} u_n converges but n=1vn\sum_{n=1}^{\infty} v_n diverges

b)

n=1un\sum_{n=1}^{\infty} u_n diverges but n=1vn\sum_{n=1}^{\infty} v_n converges

c)

n=1un\sum_{n=1}^{\infty} u_n and n=1vn\sum_{n=1}^{\infty} v_n both converge

d)

n=1un\sum_{n=1}^{\infty} u_n and n=1vn\sum_{n=1}^{\infty} v_n both diverge

Q1.7

$ \lim_{(x, y) \to (0, 0)} \frac{1 - x - y}{x^2 + y^2} $ is

a)

0

b)

1

c)

-1

d)

Does not exist

Q1.8

The gradient of the function $ f(x, y, z) = \log (x^2 + y^2 + z^2) $ at $ (3, -4, 5) $ is

a)

13(i+j+k)\frac{1}{\sqrt{3}} (i + j + k)

b)

13(i+j+k)\frac{1}{3} (i + j + k)

c)

125(3i24j+5k)\frac{1}{25} (3i^2 - 4j + 5k)

d)

125(3i2+4j+5k)\frac{1}{25} (3i^2 + 4j + 5k)

Q1.9

If $ A $ and $ B $ are any two square matrices of order $ 2 \times 2 $, then $ (A + B)^2 $ is equal to

a)

A2+2AB+B2A^2 + 2AB + B^2

b)

A2+ABBA+B2A^2 + AB - BA + B^2

c)

A2+AB+BA+B2A^2 + AB + BA + B^2

d)

A2+2BA+B2A^2 + 2BA + B^2

Q1.10

The system of equations $ x - y + 3z = 4, x + z = 2, x + y - z = 0 $ has

a)

infinitely many solutions

b)

finitely many solutions

c)

a unique solution

d)

no solution

Q.2 Solve both questions :

Q2.1

Evaluate $ \int_{0}^{\infty} x^{m} e^{-ax^n} dx $.

Q2.2

Find the surface of the solid formed by the revolution about the axis of $ y $, of the part of the curve $ ay^2 = x^3 $ from $ x = 0 $ to $ x = 4a $, which is above the $ x $-axis.

Q.3 Solve both questions :

Q3.1

Verify the Rolle's theorem for the function $ f(x) = 2x^3 + x^2 - 4x - 2 $.

Q3.2

Find $ \lim_{x \to \frac{\pi}{2}} (\sin x)^{\tan x} $.

Q.4 Solve both questions :

Q4.1

Discuss the convergence of the sequence whose $ n $ th term is $ a_n = \frac{1}{\log n} $.

Q4.2

Test the convergence of the following series : $ 1 + \frac{x}{1} + \frac{1}{2} \cdot \frac{x^3}{3} + \frac{1 \cdot 3 \cdot x^5}{2 \cdot 4 \cdot 5} + \frac{1 \cdot 3 \cdot 5 \cdot x^7}{2 \cdot 4 \cdot 5 \cdot 6 \cdot 7} + \cdots $

Q.5 Solve both questions :

Q5.1

Find the Fourier series expansion of the function $ f(x) = \{ \pi + x \}, -\pi \leq x \leq \pi $. Hence deduce that $ \frac{\pi}{4} = 1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \cdots $

Q5.2

Find the Fourier cosine series and Fourier sine series of the following function in given interval : $ f(x) = \{ x + x^2 \}, 0 < x < 1 $

Q.6 Solve both questions :

Q6.1

Discuss continuity of the following function at the point $ (-1, c) $ : $ f(x, y) = \begin{cases} \frac{x^2 y}{(1 + x)}, & x \neq -1 \\ y, & (x, y) = (-1, c) \end{cases} $

Q6.2

Find the extreme value of $ xyz $, when $ x + y + z = a, a > 0 $.

Q.7 Solve both questions :

Q7.1

Find the maximum value of the function $ f(x) = \frac{1}{x} $.

Q7.2

Find the equation of the tangent plane to the surface $ xy + yz + zx = -1 $, at the point $ (1, -1, 2) $.

Q.8 Solve this question :

Q8.1

Find the eigenvalues and eigenvectors of the following matrix : $ \begin{bmatrix} -2 & 2 & -3 \\ 2 & 1 & -6 \\ -1 & -2 & 0 \end{bmatrix} $

Q.9 Solve both questions :

Q9.1

Verify Cayley-Hamilton theorem for the matrix $ \begin{bmatrix} 0 & c & b \\ -c & 0 & a \\ b & -a & 0 \end{bmatrix} $

Q9.2

Determine the range of the following linear transformation. Also find the rank of $ T $, where it exists, $ T: V_3 \rightarrow V_3 $, defined by $ T(x_1, x_2, x_3) = \left( \frac{1}{2} x_1 + x_2 + x_3, \, x_1 - \frac{1}{3} x_2, \, x_3 \right) $


2021 V4 102102

B.Tech 1st Semester Exam., 2021

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 answer (any seven) :

Q1.1

If $ Y = \int_0^a t^4 e^{-2t^2} dt $, then the value of $ Y $ is

a)

2π64\frac{\sqrt{2\pi}}{64}

b)

3π64\frac{3\sqrt{\pi}}{64}

c)

52π64\frac{5\sqrt{2\pi}}{64}

d)

32π64\frac{3\sqrt{2\pi}}{64}

Q1.2

The maximum area of a sector whose perimeter is $ k $ is given by

a)

k216\frac{k^2}{16}

b)

k28\frac{k^2}{8}

c)

k24\frac{k^2}{4}

d)

k21\frac{k^2}{1}

Q1.3

The function $ f(x) = \begin{cases} x^2, & 0 \leq x \leq \frac{1}{2} \\ x, & \frac{1}{2} < x \leq 1 \end{cases} $, then $ \lim_{x \to \frac{1}{2}} f(x) $

a)

has the value 12\frac{1}{2}

b)

has the value 1

c)

has the value 2

d)

does not exist

Q1.4

If $ \alpha, \beta $ are the roots of the equation $ ax^2 + bx + c = 0 $, then $ \lim_{x \to \alpha} \frac{1 - \cos(\alpha x^2 + bx + c)}{(x - \alpha)^2} $ is equal to

a)

a22(αβ)2\frac{a^2}{2} (\alpha - \beta)^2

b)

a22(αβ)2-\frac{a^2}{2} (\alpha - \beta)^2

c)

a22(αβ)2\frac{a^2}{2} (\alpha - \beta)^2

d)

0

Q1.5

The series $ x - \frac{x^2}{2} + \frac{x^3}{3} - \frac{x^4}{4} + ... $ converges for

a)

(-1 &lt; x \leq 1)

b)

|x| &lt; 1 only

c)

x1|x| \leq 1

d)

all real values of xx

Q1.6

If $ u_n = \sqrt{n+1} - \sqrt{n}, \quad v_n = \sqrt{n^4 + 1} - n^2 $, then

a)

n=1un\sum_{n=1}^{\infty} u_n converges but n=1vn\sum_{n=1}^{\infty} v_n diverges

b)

n=1un\sum_{n=1}^{\infty} u_n diverges but n=1vn\sum_{n=1}^{\infty} v_n converges

c)

n=1un\sum_{n=1}^{\infty} u_n and n=1vn\sum_{n=1}^{\infty} v_n both converge

d)

n=1un\sum_{n=1}^{\infty} u_n and n=1vn\sum_{n=1}^{\infty} v_n both diverge

Q1.7

$ \lim_{(x, y) \to (0, 0)} \frac{1 - x - y}{x^2 + y^2} $ is

a)

0

b)

1

c)

-1

d)

Does not exist

Q1.8

The gradient of the function $ f(x, y, z) = \log (x^2 + y^2 + z^2) $ at $ (3, -4, 5) $ is

a)

13(i+j+k)\frac{1}{\sqrt{3}} (i + j + k)

b)

13(i+j+k)\frac{1}{3} (i + j + k)

c)

125(3i24j+5k)\frac{1}{25} (3i^2 - 4j + 5k)

d)

125(3i2+4j+5k)\frac{1}{25} (3i^2 + 4j + 5k)

Q1.9

If $ A $ and $ B $ are any two square matrices of order $ 2 \times 2 $, then $ (A + B)^2 $ is equal to

a)

A2+2AB+B2A^2 + 2AB + B^2

b)

A2+ABBA+B2A^2 + AB - BA + B^2

c)

A2+AB+BA+B2A^2 + AB + BA + B^2

d)

A2+2BA+B2A^2 + 2BA + B^2

Q1.10

The system of equations $ x - y + 3z = 4, x + z = 2, x + y - z = 0 $ has

a)

infinitely many solutions

b)

finitely many solutions

c)

a unique solution

d)

no solution

Q.2 Solve both questions :

Q2.1

Evaluate $ \int_{0}^{\infty} x^{m} e^{-ax^n} dx $.

Q2.2

Find the surface of the solid formed by the revolution about the axis of $ y $, of the part of the curve $ ay^2 = x^3 $ from $ x = 0 $ to $ x = 4a $, which is above the $ x $-axis.

Q.3 Solve both questions :

Q3.1

Verify the Rolle's theorem for the function $ f(x) = 2x^3 + x^2 - 4x - 2 $.

Q3.2

Find $ \lim_{x \to \frac{\pi}{2}} (\sin x)^{\tan x} $.

Q.4 Solve both questions :

Q4.1

Discuss the convergence of the sequence whose $ n $ th term is $ a_n = \frac{1}{\log n} $.

Q4.2

Test the convergence of the following series : $ 1 + \frac{x}{1} + \frac{1}{2} \cdot \frac{x^3}{3} + \frac{1 \cdot 3 \cdot x^5}{2 \cdot 4 \cdot 5} + \frac{1 \cdot 3 \cdot 5 \cdot x^7}{2 \cdot 4 \cdot 5 \cdot 6 \cdot 7} + \cdots $

Q.5 Solve both questions :

Q5.1

Find the Fourier series expansion of the function $ f(x) = \{ \pi + x \}, -\pi \leq x \leq \pi $. Hence deduce that $ \frac{\pi}{4} = 1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \cdots $

Q5.2

Find the Fourier cosine series and Fourier sine series of the following function in given interval : $ f(x) = \{ x + x^2 \}, 0 < x < 1 $

Q.6 Solve both questions :

Q6.1

Discuss continuity of the following function at the point $ (-1, c) $ : $ f(x, y) = \begin{cases} \frac{x^2 y}{(1 + x)}, & x \neq -1 \\ y, & (x, y) = (-1, c) \end{cases} $

Q6.2

Find the extreme value of $ xyz $, when $ x + y + z = a, a > 0 $.

Q.7 Solve both questions :

Q7.1

Find the maximum value of the function $ f(x) = \frac{1}{x} $.

Q7.2

Find the equation of the tangent plane to the surface $ xy + yz + zx = -1 $, at the point $ (1, -1, 2) $.

Q.8 Solve this question :

Q8.1

Find the eigenvalues and eigenvectors of the following matrix : $ \begin{bmatrix} -2 & 2 & -3 \\ 2 & 1 & -6 \\ -1 & -2 & 0 \end{bmatrix} $

Q.9 Solve both questions :

Q9.1

Verify Cayley-Hamilton theorem for the matrix $ \begin{bmatrix} 0 & c & b \\ -c & 0 & a \\ b & -a & 0 \end{bmatrix} $

Q9.2

Determine the range of the following linear transformation. Also find the rank of $ T $, where it exists, $ T: V_3 \rightarrow V_3 $, defined by $ T(x_1, x_2, x_3) = \left( \frac{1}{2} x_1 + x_2 + x_3, \, x_1 - \frac{1}{3} x_2, \, x_3 \right) $


2020 SPECIAL 102102/105102

B.Tech 1st Semester Special Exam., 2020

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 answer of the following (any seven) :

Q1.1

If $ Y = \int_0^{\infty} \frac{x^a}{a^x} \, dx, \, a > 1 $, then the value of $ Y $ is

a)

Γ(a)[logea]a\frac{\Gamma(a)}{[\log_e a]^a}

b)

Γ(a+1)[logea]a\frac{\Gamma(a + 1)}{[\log_e a]^a}

c)

Γ(a+1)[logea]a+1\frac{\Gamma(a + 1)}{[\log_e a]^{a+1}}

d)

Γ(a)[logea]a+1\frac{\Gamma(a)}{[\log_e a]^{a+1}}

Q1.2

The area bounded by the axis of $ x $, and the curve and ordinates $ y = \cosh \frac{x}{c} $ from $ x = 0 $ to $ x = a $ is

a)

coshac\cosh \frac{a}{c}

b)

sinhac\sinh \frac{a}{c}

c)

sinhac\sinh \frac{a}{c}

d)

None of the above

Q1.3

Consider the following functions :
1. $ y = x \sin \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
2. $ y = x^2 \sin \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
3. $ y = x^2 \cos \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
4. $ y = x \cos \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
The functions, differentiable at $ x = 0 $, are

a)

1 and 2

b)

2 and 3

c)

3 and 4

d)

1 and 4

Q1.4

For a positive term series $ \sum a_n $, the ratio test states that

a)

the series converges, if \lim_{n \to \infty} \frac{a_{n+1}}{a_n} &gt; 1

b)

the series converges, if \lim_{n \to \infty} \frac{a_{n+1}}{a_n} &lt; 1

c)

the series converges, if limnan+1an=1\lim_{n \to \infty} \frac{a_{n+1}}{a_n} = 1

d)

None of the above

Q1.5

If $ \lim_{x \to \infty} \frac{\sin 2x + a \sin x}{x^3} = b $ where $ b $ is finite, then the values of $ a $ and $ b $ respectively will be

a)

(-2, -1)

b)

(2, 1)

c)

(-2, 1)

d)

(2, -1)

Q1.6

The expansion of $ \tan x $ in powers of $ x $ by Maclaurin's theorem is valid in the interval

a)

(,)(-\infty, \infty)

b)

(3π2,3π2)\left(-\frac{3\pi}{2}, \frac{3\pi}{2}\right)

c)

(π,π)(-\pi, \pi)

d)

(π2,π2)\left(-\frac{\pi}{2}, \frac{\pi}{2}\right)

Q1.7

The value of $ \lim_{(x, y) \to (k, 0)} \left(1 + \frac{x}{y}\right)^y $ is

a)

1

b)

eke^{-k}

c)

eke^k

d)

Does not exist

Q1.8

The gradient of the function $ f(x, y, z) = \sin(xyz) $, at $ (1, -1, \pi) $, is

a)

π(ij+k)\pi(i - j + k)

b)

π(i+j+k)\pi(i + j + k)

c)

(i+j+k)(i + j + k)

d)

(πiπj+k)(\pi i - \pi j + k)

Q1.9

If det(A) = 7, where $ A = \begin{bmatrix} a & b & c \\ 1 & 1 & g \\ g & \omega & 1 \end{bmatrix} $, then det(2A)^{-1} is equal to

a)

1449\frac{14}{49}

b)

156\frac{1}{56}

c)

72\frac{7}{2}

Q1.10

If $ 3x + 2y + z = 0 $, $ x + 4y + z = 0 $ and $ 2x + y + 4z = 0 $ be a system of equations, then

a)

it is inconsistent

b)

it has only the trivial solution (0, 0, 0)

c)

it can be reduced to a single equation and so a solution does not exist

d)

the determinant of the matrix of coefficients is zero

Q.2 Solve both questions :

Q2.1

Evaluate $ \int_{0}^{\infty} \log \left( x + \frac{1}{x} \right) \frac{dx}{1 + x^2} $

Q2.2

Find the volume of the solid generated by rotating completely about the x-axis where the area enclosed between $ y^2 = x^3 + 5x $ and the line $ x = 2 $ and $ x = 4 $ about its major axis.

Q.3 Solve both questions :

Q3.1

Find the maximum value of the function $ f(x) = \frac{x}{1 + x \tan x} $

Q3.2

It is given that Rolle's theorem holds for the function $ f(x) = x^3 + bx^2 + cx $, $ 1 \leq x \leq 2 $ at the point $ x = \frac{4}{3} $. Find the values of b and c.

Q.4 Solve both questions :

Q4.1

Discuss the convergence of the sequence whose n-th term is $ \alpha_n = \frac{(-1)^n}{n} + 1 $

Q4.2

Test the convergence of the following series : $ x^2 + \frac{2^2 x^4}{3.4} + \frac{2^2 4^2 x^6}{3.4.5.6} + \frac{2^2 4^2 6^2 x^8}{3.4.5.6.7.8} ... $

Q.5 Solve both questions :

Q5.1

Find the Fourier series expansion of the function $ f(x) = \{x^2, -2 \leq x \leq 2\} $. Hence deduce that $ \frac{\pi^2}{6} = \frac{1}{1^2} + \frac{1}{2^2} + \frac{1}{3^2} + \frac{1}{4^2} + ... $

Q5.2

Find the Fourier cosine series and Fourier sine series of the following function in given interval : $ f(x) = \begin{cases} x, & 0 < x < 2 \\ 2, & 2 \leq x < 4 \end{cases} $

Q.6 Solve both questions :

Q6.1

Discuss continuity of the following function at the point $ (0, 0) $ : $ f(x, y) = \begin{cases} \frac{x^2 y^2}{\left( x^3 + y^3 \right)} , & (x, y) \neq (0, 0) \\ 0, & (x, y) = (0, 0) \end{cases} $

Q6.2

Find the maximum value of $ xyz $ under the constraints $ x^2 + z^2 = 1 $ and $ y - x = 0 $.

Q.7 Solve both questions :

Q7.1

Find the value of $ \lim_{x \to {\infty}} \left( \frac{x+4}{x+2} \right)^{x+3} $

Q7.2

Find the equation of the tangent plane to the surface $ x^2 - 3y^2 - z^2 = 2 $, at the point $ (3, 1, 2) $.

Q.8 Solve this question :

Q8.1

Find the eigenvalues and eigenvectors of the following matrix : $ \begin{bmatrix} 6 & -2 & 2 \\ -2 & 3 & -1 \\ 2 & -1 & 3 \end{bmatrix} $

Q.9 Solve both questions :

Q9.1

Verify Cayley-Hamilton theorem for the matrix $ \begin{bmatrix} 0 & 0 & 1 \\ 3 & 1 & 0 \\ -2 & 1 & 4 \end{bmatrix} $

Q9.2

Determine the range of the following linear transformation. Also find the rank of $ T $, where it exists. $ T: V_2 \to V_3 $ defined by $ T(x_1, x_2) = (x_1, x_1 + x_2, x_2) $


2020 102102/105102

B.Tech 1st Semester Special Exam., 2020

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 answer of the following (any seven) :

Q1.1

If $ Y = \int_0^{\infty} \frac{x^a}{a^x} \, dx, \, a > 1 $, then the value of $ Y $ is

a)

Γ(a)[logea]a\frac{\Gamma(a)}{[\log_e a]^a}

b)

Γ(a+1)[logea]a\frac{\Gamma(a + 1)}{[\log_e a]^a}

c)

Γ(a+1)[logea]a+1\frac{\Gamma(a + 1)}{[\log_e a]^{a+1}}

d)

Γ(a)[logea]a+1\frac{\Gamma(a)}{[\log_e a]^{a+1}}

Q1.2

The area bounded by the axis of $ x $, and the curve and ordinates $ y = \cosh \frac{x}{c} $ from $ x = 0 $ to $ x = a $ is

a)

coshac\cosh \frac{a}{c}

b)

sinhac\sinh \frac{a}{c}

c)

sinhac\sinh \frac{a}{c}

d)

None of the above

Q1.3

Consider the following functions :
1. $ y = x \sin \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
2. $ y = x^2 \sin \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
3. $ y = x^2 \cos \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
4. $ y = x \cos \frac{1}{x}, \, x \neq 0; \, \text{and } y = 0 \, \text{if } x = 0 $
The functions, differentiable at $ x = 0 $, are

a)

1 and 2

b)

2 and 3

c)

3 and 4

d)

1 and 4

Q1.4

For a positive term series $ \sum a_n $, the ratio test states that

a)

the series converges, if \lim_{n \to \infty} \frac{a_{n+1}}{a_n} &gt; 1

b)

the series converges, if \lim_{n \to \infty} \frac{a_{n+1}}{a_n} &lt; 1

c)

the series converges, if limnan+1an=1\lim_{n \to \infty} \frac{a_{n+1}}{a_n} = 1

d)

None of the above

Q1.5

If $ \lim_{x \to \infty} \frac{\sin 2x + a \sin x}{x^3} = b $ where $ b $ is finite, then the values of $ a $ and $ b $ respectively will be

a)

(-2, -1)

b)

(2, 1)

c)

(-2, 1)

d)

(2, -1)

Q1.6

The expansion of $ \tan x $ in powers of $ x $ by Maclaurin's theorem is valid in the interval

a)

(,)(-\infty, \infty)

b)

(3π2,3π2)\left(-\frac{3\pi}{2}, \frac{3\pi}{2}\right)

c)

(π,π)(-\pi, \pi)

d)

(π2,π2)\left(-\frac{\pi}{2}, \frac{\pi}{2}\right)

Q1.7

The value of $ \lim_{(x, y) \to (k, 0)} \left(1 + \frac{x}{y}\right)^y $ is

a)

1

b)

eke^{-k}

c)

eke^k

d)

Does not exist

Q1.8

The gradient of the function $ f(x, y, z) = \sin(xyz) $, at $ (1, -1, \pi) $, is

a)

π(ij+k)\pi(i - j + k)

b)

π(i+j+k)\pi(i + j + k)

c)

(i+j+k)(i + j + k)

d)

(πiπj+k)(\pi i - \pi j + k)

Q1.9

If det(A) = 7, where $ A = \begin{bmatrix} a & b & c \\ 1 & 1 & g \\ g & \omega & 1 \end{bmatrix} $, then det(2A)^{-1} is equal to

a)

1449\frac{14}{49}

b)

156\frac{1}{56}

c)

72\frac{7}{2}

Q1.10

If $ 3x + 2y + z = 0 $, $ x + 4y + z = 0 $ and $ 2x + y + 4z = 0 $ be a system of equations, then

a)

it is inconsistent

b)

it has only the trivial solution (0, 0, 0)

c)

it can be reduced to a single equation and so a solution does not exist

d)

the determinant of the matrix of coefficients is zero

Q.2 Solve both questions :

Q2.1

Evaluate $ \int_{0}^{\infty} \log \left( x + \frac{1}{x} \right) \frac{dx}{1 + x^2} $

Q2.2

Find the volume of the solid generated by rotating completely about the x-axis where the area enclosed between $ y^2 = x^3 + 5x $ and the line $ x = 2 $ and $ x = 4 $ about its major axis.

Q.3 Solve both questions :

Q3.1

Find the maximum value of the function $ f(x) = \frac{x}{1 + x \tan x} $

Q3.2

It is given that Rolle's theorem holds for the function $ f(x) = x^3 + bx^2 + cx $, $ 1 \leq x \leq 2 $ at the point $ x = \frac{4}{3} $. Find the values of b and c.

Q.4 Solve both questions :

Q4.1

Discuss the convergence of the sequence whose n-th term is $ \alpha_n = \frac{(-1)^n}{n} + 1 $

Q4.2

Test the convergence of the following series : $ x^2 + \frac{2^2 x^4}{3.4} + \frac{2^2 4^2 x^6}{3.4.5.6} + \frac{2^2 4^2 6^2 x^8}{3.4.5.6.7.8} ... $

Q.5 Solve both questions :

Q5.1

Find the Fourier series expansion of the function $ f(x) = \{x^2, -2 \leq x \leq 2\} $. Hence deduce that $ \frac{\pi^2}{6} = \frac{1}{1^2} + \frac{1}{2^2} + \frac{1}{3^2} + \frac{1}{4^2} + ... $

Q5.2

Find the Fourier cosine series and Fourier sine series of the following function in given interval : $ f(x) = \begin{cases} x, & 0 < x < 2 \\ 2, & 2 \leq x < 4 \end{cases} $

Q.6 Solve both questions :

Q6.1

Discuss continuity of the following function at the point $ (0, 0) $ : $ f(x, y) = \begin{cases} \frac{x^2 y^2}{\left( x^3 + y^3 \right)} , & (x, y) \neq (0, 0) \\ 0, & (x, y) = (0, 0) \end{cases} $

Q6.2

Find the maximum value of $ xyz $ under the constraints $ x^2 + z^2 = 1 $ and $ y - x = 0 $.

Q.7 Solve both questions :

Q7.1

Find the value of $ \lim_{x \to {\infty}} \left( \frac{x+4}{x+2} \right)^{x+3} $

Q7.2

Find the equation of the tangent plane to the surface $ x^2 - 3y^2 - z^2 = 2 $, at the point $ (3, 1, 2) $.

Q.8 Solve this question :

Q8.1

Find the eigenvalues and eigenvectors of the following matrix : $ \begin{bmatrix} 6 & -2 & 2 \\ -2 & 3 & -1 \\ 2 & -1 & 3 \end{bmatrix} $

Q.9 Solve both questions :

Q9.1

Verify Cayley-Hamilton theorem for the matrix $ \begin{bmatrix} 0 & 0 & 1 \\ 3 & 1 & 0 \\ -2 & 1 & 4 \end{bmatrix} $

Q9.2

Determine the range of the following linear transformation. Also find the rank of $ T $, where it exists. $ T: V_2 \to V_3 $ defined by $ T(x_1, x_2) = (x_1, x_1 + x_2, x_2) $


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