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## TN State Board 12th Maths Model Question Paper 5 English Medium

Instructions:

1.  The question paper comprises of four parts.
2.  You are to attempt all the parts. An internal choice of questions is provided wherever applicable.
3. questions of Part I, II. III and IV are to be attempted separately
4. Question numbers 1 to 20 in Part I are objective type questions of one -mark each. These are to be answered by choosing the most suitable answer from the given four alternatives and writing the option code and the corresponding answer
5. Question numbers 21 to 30 in Part II are two-marks questions. These are to be answered in about one or two sentences.
6. Question numbers 31 to 40 in Parr III are three-marks questions, These are to be answered in about three to five short sentences.
7. Question numbers 41 to 47 in Part IV are five-marks questions. These are to be answered) in detail. Draw diagrams wherever necessary.

Time: 3 Hours
Maximum Marks: 90

Part – I

I. Choose the correct answer. Answer all the questions. [20 × 1 = 20]

Question 1.
If | adj(adj A) | = |A|9, then the order of the square matrix A is _______.
(a) 3
(b) 4
(c) 2
(d) 5
(b) 4

Question 2.
If |z1| = 1, |z2| = 2, |z3| = 3 and |9z1z2 + 4z1z2 + z2z3| = 12, then the value of |z1 + z2+ z3| is ________.
(a) 1
(b) 2
(c) 3
(d) 4
(b) 2

Question 3.
The value of $$\left(\frac{1+\sqrt{3} i}{1-\sqrt{3} i}\right)^{10}$$ is ________. (a) cis $$\frac{2 \pi}{3}$$

Question 4.
If $$\cot ^{-1}(\sqrt{\sin \alpha})+\tan ^{-1}(\sqrt{\sin \alpha})=u$$, then cos 2u is equal to _____.
(a) tan2 α
(b) 0
(c) -1
(d) tan 2α
(c) -1 Question 5.
If $$\cot ^{-1} x=\frac{2 \pi}{5}$$ for some x∈R, the value of tan-1 x is _______. (c) $$\frac{\pi}{10}$$

Question 6.
The radius of the circle passing through the point (6, 2) two of whose diameter are x + y = 6 and x + 2y = 4 is ____.
(a) 10
(b) $$2 \sqrt{5}$$
(c) 6
(d) 4
(b) $$2 \sqrt{5}$$

Question 7.
The length of the L.R. of x2 = -4y is _______.
(a) 1
(b) 2
(c) 3
(d) 4
(d) 4

Question 8.
Distance from the origin to the plane 3x – 6y + 2z + 7 = 0 is ______.
(a) 0
(b) 1
(c) 2
(d) 3
(b) 1

Question 9.
The distance from the origin to the plane $$\vec{r} \cdot(2 \vec{i}-\vec{j}+5 \vec{k})=7$$ is _____. (a) $$\frac{7}{\sqrt{30}}$$ Question 10.
The number given by the Mean value theorem for the function $$\frac{1}{x}$$, x ∈ [1, 9] is ______.
(a) 2
(b) 2.5
(c) 3
(d) 3.5
(c) 3

Question 11.
f is a differentiable function defined on an interval I with positive derivative. Then f is ______.
(a) increasing on I
(b) decreasing on I
(c) strictly increasing on I
(d) strictly decreasing on I
(c) strictly increasing on I

Question 12.
If we measure the side of a cube to be 4 cm with an error of 0.1 cm, then the error in our calculation of the volume is ________.
(a) 0.4 cu.cm
(b) 0.45 cu.cm
(c) 2 cu.cm
(d) 4.8 cu.cm
(d) 4.8 cu.cm

Question 13.
If u(x, y) = $$e^{x^{2}+y^{2}}$$, then $$\frac{\partial u}{\partial x}$$ is equal to _______.
(a) $$e^{x^{2}+y^{2}}$$
(b) 2xu
(c) x2u
(d) y2u
(b) 2xu

Question 14.
The value of $$\int_{0}^{\infty} e^{-3 x} x^{2} d x$$ is _______.
(a) $$\frac{7}{27}$$
(b) $$\frac{5}{27}$$
(c) $$\frac{4}{27}$$
(d) $$\frac{2}{27}$$
(d) $$\frac{2}{27}$$ Question 15.
$$\int_{0}^{a} f(x) d x$$ is _____. (b) $$\int_{0}^{a} f(a-x) d x$$

Question 16.
The integrating factor of the differential equation $$\frac{d y}{d x}$$ + P(x) y = Q (x) is x, then P(x) ______.
(a) x
(b) $$\frac{x^{2}}{2}$$
(c) $$\frac{1}{x}$$
(d) $$\frac{1}{x^{2}}\frac{1}{x^{2}}$$
(c) $$\frac{1}{x}$$

Question 17.
The order and degree of the differential equation p$$\frac{d^{2} y}{d x^{2}}+\left(\frac{d y}{d x}\right)^{1 / 3}+x^{1 / 4}=0$$ are respectively _______.
(a) 2, 3
(b) 3, 3
(c) 2, 6
(d) 2, 4
(a) 2, 3

Question 18 .
Which of the following is a discrete random variable?
I. The number of cars crossing a particular signal in a day.
II. The number of customers in a queue to buy train tickets at a moment.
III. The time taken to complete a telephone call.
(a) I and II
(b) II only
(c) III only
(d) II and III
(a) I and II Question 19.
If p is true and q is false then which of the following is not true?
(a) p → q is false
(b)p ∨ q is true
(c)p ∧ q is false
(d) p ↔ q is true
(d) p ↔ q is true

Question 20.
The operation * defined by a*b = $$\frac{a b}{7}$$ is not a binary operation on ______.
(a) Q+
(b) Z
(c) R
(c) C
(b) Z

Part – II

II. Answer any seven questions. Question No. 30 is compulsory. [7 × 2 = 14]

Question 21.
Using elementary transformations find the inverse of the following matrix $$\left[\begin{array}{ll} 4 & 7 \\ 3 & 0 \end{array}\right]$$ Question 22.
If Z1 = 1 – 3i, z2 = -4i, and z3 = 5, show that (z1 + z2) + z3 = Z1 + (z2 + z3)
z1 = 1 – 3i, z2 = 4i, z3 = 5
(z1 + z2) + z3 = (1 – 3i – 4i) + 5(1 – 7i) + 5
= 6 – 7i …..(1)
z1 + (z2 + z3) = (1 – 3i) + (-4i + 5)
= 6 – 7i …..(2)
from(1)& (2)we get
∴ (z1 + z2) + z3 = z1 + (z2 + z3) Question 23.
Find a polynomial equation of minimum degree with rational coefficients, having 2+ $$\sqrt{3}$$ i as
a root.
Given roots is (2 + $$\sqrt{3}$$ i)
∴ The other root is (2 – $$\sqrt{3}$$ i), since the imaginary roots with real co-efficient occur as conjugate
pairs.
x2 – x(S.O.R) + P.O.R = 0 ⇒ x2 – x(4) + (4 + 3) = 0
x2 – 4x + 7 = 0.

Question 24.
Evaluate: $$\lim _{x \rightarrow \infty}\left(\frac{x^{2}+17 x+29}{x^{4}}\right)$$
This is an indeterminate of the form ($$\frac{\infty}{\infty}$$). To evaluate this limit, we apply l’Hôpital Rule. Question 25.
Let g(x, y) = 2y + x2, x = 2r – s, y = r2 + 2s, r, s ∈R. Find $$\frac{\partial g}{\partial r}, \frac{\partial g}{\partial s}$$. Question 26.
Evaluate: $$\int_{0}^{\frac{\pi}{2}}\left(\sin ^{2} x+\cos ^{4} x\right) d x$$ Question 27.
Find the differential equation corresponding to the family of curves represented by the equation y = Ae8x + Be-8x, where A and B are arbitrary constants.
y = Ae8x + Be-8x Where A and B are arbitrary constants.
Differentiate with respect to ‘x’  Question 28.
If F(x) = $$\frac{1}{\pi}\left(\frac{\pi}{2}+\tan ^{-1} x\right)$$ – ∞ < x < ∞ is a distribution function of a continuous variable X, find P (0 ≤ x ≤ 1). Question 29.
Show that p → q and q → p are not equivalent.
Truth table for p → q Truth table for q → p The entries in the column corresponding to p → q and q → p are not identical, hence they are not equivalent.

Question 30.
Show that the lines $$\frac{x-1}{4}=\frac{2-y}{6}=\frac{z-4}{12}$$ and $$\frac{x-3}{-2}=\frac{y-3}{3}=\frac{5-z}{6}$$ are parallel.
We observe that the straight line $$\frac{x-1}{4}=\frac{2-y}{6}=\frac{z-4}{12}$$ is parallel to the vector $$4 \hat{i}-6 \hat{j}+12 \hat{k}$$ and the straight line $$\frac{x-3}{-2}=\frac{y-3}{3}=\frac{5-z}{6}$$ is parallel to the vector $$-2 \hat{i}+3 \hat{j}-6 \hat{k}$$.
Since $$4 \hat{i}-6 \hat{j}+12 \hat{k}=-2(-2 \hat{i}+3 \hat{j}-6 \hat{k})$$ the two vectors are parallel, and hence the two straight lines are parallel.

Part – III

II. Answer any seven questions. Question No. 40 is compulsory. [7 × 3 = 21]

Question 31.
Using elementary transformations find the inverse of the matrix $$\left[\begin{array}{ccc} 1 & -1 & 1 \\ 2 & 1 & -3 \\ 1 & 1 & 1 \end{array}\right]$$

Question 32.
Find the square roots of – 15 – 8i Question 33.
Find the sum of the squares of the roots of ax4 + bx3 + cx2 + dx + e = 0, a ≠ 0

Question 34.
For what value of x, the inequality $$\frac{\pi}{2}$$ < cos-1 (3x – 1) < π holds?

Question 35.
Find the foot of the perpendicular drawn from the point (5, 4, 2) to the line $$\frac{x+1}{2}=\frac{y-3}{3}=\frac{z-1}{-1}$$. Also, find the equation of the perpendicular.

Question 36.
Evaluate $$\int_{0}^{\infty} \frac{x^{n}}{n^{x}} d x$$, where n is a positive integer ≥ 2.

Question 37.
The engine of a motor boat moving at 10 m/s is shut off. Given that the retardation at any subsequent time (after shutting off the engine) equal to die velocity at that time. Find the velocity after 2 seconds of switching off the engine.

Question 38.
The probability that Mr.Q hits a target at any trial is $$\frac{1}{4}$$. Suppose he tries at the target 10 times. Find the probability that he hits the target (i) exactly 4 times (ii) at least one time.

Question 39.
Consider the binary operation * defined on the set A = {a, b, c, d} by the following table: Is it commutative and associative? Question 40.
Evaluate the following limit, if necessary use l’Hopital Rule. $$\lim _{x \rightarrow \infty}\left(1+\frac{1}{x}\right)^{x}$$

Part – IV

IV. Answer all the questions. [7 × 5 = 35]

Question 41.
(a) Find the inverse of A = $$\left[\begin{array}{lll} 2 & 1 & 1 \\ 3 & 2 & 1 \\ 2 & 1 & 2 \end{array}\right]$$ by Gauss-Jordan method
[OR]
(b) Find the point of intersection of the lines $$\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}$$ and $$\frac{x-4}{5}=\frac{y-1}{2}=z$$.

Question 42.
(a) Suppose z1, z2 and z3 are the vertices of an equilateral triangle inscribed in the circle.
|z| = 2. If z1 = 1 + i$$\sqrt{3}$$, then find z2 and z3.
[OR]
(b) If A = $$\left[\begin{array}{cc} 5 & 3 \\ -1 & -2 \end{array}\right]$$ show that A2 – 3A – 7I2 = O2. Hence Find A-1. Question 43.
(a) Solve the equation 3x3 – 16x2 + 23x – 6 = 0 if the product of two roots is 1.
[OR]
(b) The mean and variance of a binomial variate X are respectively 2 and 1.5.
Find (i) P(X = 0) (ii) P(X = 1) (iii) P(X ≥ 1)

Question 44.
(a) Find the value of $$\cos \left(\sin ^{-1}\left(\frac{4}{5}\right)-\tan ^{-1}\left(\frac{3}{4}\right)\right)$$
[OR]
(b) Find, by integration, the volume of the solid generated by revolving about y-axis the region bounded between the curve y = $$\frac{3}{4} \sqrt{x^{2}-16}$$, x ≥ 4, the y-axis, and the lines y = 1 and y = 6.

Question 45.
(a) A semielliptical archway over a one-way road has a height of 3m and a width of 12m. The truck has a width of 3m and a height of 2.7m. Will the truck clear the opening of the archway?
[OR]
(b) For the function f(x, y) = $$\frac{3 x}{y+\sin x}$$ find the fx, fy, and show that fxy = fyx.

Question 46.
(a) Derive the equation of the plane in the intercept form.
[OR]
(b) Let A be Q\{1}. Define * on A by x * y = x +y – xy. Is * binary on A ? If so, examine the existence of identity, existence of inverse properties for the operation * on A . Question 47.
(a) Find the angle between the rectangular hyperbola xy = 2 and the parabola x2 + 4y = 0.
[OR]
(b) A pot of boiling water at 100° C is removed from a stove at time t = 0 and left to cool in the kitchen. After 5 minutes, the water temperature has decreased to 80° C, and another 5 minutes later it has dropped to 65° C. Determine the temperature of the kitchen.