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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

Published on: 20/10/2025
Download Tamil Nadu 12th Standard Maths question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
The proposition p ∧ (¬p ∨ q) is
a tautology
a contradiction
logically equivalent to p ∧ q
logically equivalent to p ∨ q
2.
3.
Which one of the following statements has truth value F?
Chennai is in India or \(\sqrt 2\) is an integer
Chennai is in India or \(\sqrt 2\) is an irrational number
Chennai is in China or \(\sqrt 2\) is an integer
Chennai is in China or \(\sqrt 2\) is an irrational number
4.
5.
The operation * defined by \(a * b =\frac{ab}{7}\) is not a binary operation on
Q+
Z
R
C
6.
Which one of the following is a binary operation on N?
Subtraction
Multiplication
Division
All the above
7.
A binary operation on a set S is a function from
S ⟶ S
(SxS) ⟶ S
S⟶ (SxS)
(SxS) ⟶ (SxS)
8.
The value of \(\int _{ -\frac { \pi }{ 2 } }^{ \frac { \pi }{ 2 } }{ { sin }^{ 2 }x\ cos \ x \ dx } \) is
\(\frac{3}{2}\)
\(\frac{1}{2}\)
0
\(\frac{2}{3}\)
9.
For any value of \(n \in \mathbb{Z}, \int_{0}^{\pi} e^{\cos ^{2} x} \cos ^{3}[(2 n+1) x] d x\) is
\(\frac{\pi}{2}\)
\(\pi\)
0
2
10.
\(\text { The value of } \int_{0}^{\frac{2}{3}} \frac{d x}{\sqrt{4-9 x^{2}}} \text { is }\)
\(\frac{\pi}{6}\)
\(\frac{\pi}{2}\)
\(\frac{\pi}{4}\)
\({\pi}\)
11.
The value of \(\int _{ 0 }^{ 1 }{ { ({ sin }^{ -1 }x) }^{ 2 } } dx\) is
\(\frac { { \pi }^{ 2 } }{ 4 } -1\)
\(\frac { { \pi }^{ 2 } }{ 4 } +2\)
\(\frac { { \pi }^{ 2 } }{ 4 } +1\)
\(\frac { { \pi }^{ 2 } }{ 4 } -2\)
12.
13.
The value of \(\int _{ 0 }^{ \infty }{ { e }^{ -3x }{ x }^{ 2 }dx } \) is
\(\frac{7}{27}\)
\(\frac{5}{27}\)
\(\frac{4}{27}\)
\(\frac{2}{27}\)
14.
The value of \(\int _{ 0 }^{ \pi }{ { sin }^{ 4 }xdx } \) is
\(\frac{3\pi}{10}\)
\(\frac{3\pi}{8}\)
\(\frac{3\pi}{4}\)
\(\frac{3\pi}{2}\)
15.
16.
If w (x, y, z) = x2 (y - z) + y2 (z - x) + z2(x - y), then \(\frac { { \partial }w }{ \partial x } +\frac { \partial w }{ \partial y } +\frac { \partial w }{ \partial z } \) is
xy + yz + zx
x(y + z)
y(z + x)
0
17.
The value of \(\int _{ 0 }^{ \frac { \pi }{ 6 } }{ { cos }^{ 3 }3x\ dx }\ is\)
\(\frac{2}{3}\)
\(\frac{2}{9}\)
\(\frac{1}{9}\)
\(\frac{1}{3}\)
18.
The area between y2 = 4x and its latus rectum is
\(\frac{2}{3}\)
\(\frac{4}{3}\)
\(\frac{8}{3}\)
\(\frac{5}{3}\)
19.
If \(f(x)=\int_{0}^{x} t \cos t d t, \text { then } \frac{d f}{d x}=\)
cos x - x sin x
sin x + x cos x
x cos x
x sin x
20.
The value of \(\int _{ -4 }^{ 4 }{ \left[ { tan }^{ -1 }\left( \frac { { x }^{ 2 } }{ { x }^{ 4 }+1 } \right) +{ tan }^{ -1 }\left( \frac { { x }^{ 4 }+1 }{ { x }^{ 2 } } \right) \right] dx } \) is
\(\pi\)
\(2\pi\)
\(3\pi\)
\(4\pi\)
21.
The approximate change in the volume V of a cube of side x metres caused by increasing the side by 1% is
0.3xdx m3
0.03x m3
0.03x2 m3
0.03x3 m3
22.
If w (x, y) = xy, x > 0, then \(\frac { \partial w }{ \partial x } \) is equal to
xy log x
y log x
yxy-1
x log y
23.
If \(u(x, y)=e^{x^{2}+y^{2}}\),then \(\frac { \partial u }{ \partial x } \) is equal to
\(e^{x^{2}+y^{2}}\)
2xu
x2u
y2u
24.
A circular template has a radius of 10 cm. The measurement of radius has an approximate error of 0.02 cm. Then the percentage error in calculating area of this template is
0.2%
0.4%
0.04%
0.08%
25.
26.
The probability mass function of a random variable is defined as:
| x | -2 | -1 | 0 | 1 | 2 |
| f(x) | k | 2k | 3k | 4k | 5k |
Then E(X ) is equal to:
\(\frac { 1 }{ 15 } \)
\(\frac { 1 }{ 10 } \)
\(\frac { 1 }{ 3 } \)
\(\frac { 2 }{ 3 } \)
27.
28.
The random variable X has the probability density function
\(f(x)=\left\{\begin{array}{lr}
a x+b & 0<x<1 \\
0 & \text { otherwise }
\end{array}\right.\) and \(E(X)=\frac { 7 }{ 12 } \), then a and b are respectively
1 and \(\frac { 1 }{ 2 } \)
\(\frac { 1 }{ 2 } \) and 1
2 and 1
1 and 2
29.
30.
Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed n times. Then the possible values of X are
i + 2n, i = 0,1,2... n
2i- n, i = 0,1,2... n
n - i, i = 0,1,2... n
2i + 2n, i = 0, 1, 2...n
31.
32.
Let X be random variable with probability density function
\(f(x)=\left\{\begin{array}{ll} \frac{2}{x^{3}} & x \geq 1 \\ 0 & x<1 \end{array}\right.\)
Which of the following statement is correct
both mean and variance exist
mean exists but variance does not exist
both mean and variance do not exist
variance exists but Mean does not exist
33.
34.
The population P in any year t is such that the rate of increase in the population is proportional to the population. Then
P=Cekt
P=Ce-kt
P=Ckt
P=C
35.
The number of arbitrary constants in the particular solution of a differential equation of third order is
3
2
1
0
36.
37.
The solution of the differential equation \(\frac { dy }{ dx } =2xy\) is
y = Cex2
y = 2x2 + C
y = Ce−x2 + C
y = x2 + C
38.
If p and q are the order and degree of the differential equation \(y=\frac { dy }{ dx } +{ x }^{ 3 }\left( \frac { { d }^{ 2 }y }{ { dx }^{ 2 } } \right) +xy=cosx,\) When
p < q
p = q
p > q
p exists and q does not exist
39.
40.
41.
The general solution of the differential equation \(\frac { dy }{ dx } =\frac { y }{ x } \) is
xy = k
y = k log x
y = kx
log y = kx
42.
43.
The differential equation representing the family of curves y = Acos(x + B), where A and B are parameters,is
\(\frac { { d }^{ 2 }y }{ { dx }^{ 2 } } -y=0\)
\(\frac { { d }^{ 2 }y }{ { dx }^{ 2 } }+y=0\)
\(\frac { { d }^{ 2 }y }{ { dx }^{ 2 } }=0\)
\(\frac { { d }^{ 2 }x }{ { dy }^{ 2 } }=0\)
44.
45.
The maximum product of two positive numbers, when their sum of the squares is 200, is
100
\(25\sqrt { 7 } \)
28
\(24\sqrt { 14 } \)
46.
The maximum slope of the tangent to the curve y = ex sin x, x ∈ [0, 2π] is at
\(x=\frac { \pi }{ 4 } \)
\(x=\frac { \pi }{ 2 } \)
\(x=\pi \)
\(x=\frac { 3\pi }{ 2 } \)
47.
The number given by the Rolle's theorem for the functlon x3 - 3x2, x ∈ [0, 3] is
1
\(\sqrt { 2 } \)
\(\frac { 3 }{ 2 } \)
2
48.
What is the value of the limit \(\lim _{x \rightarrow 0}\left(\cot x-\frac{1}{x}\right) \text { is }\)
0
1
2
∞
49.
The abscissa of the point on the curve \(f\left( x \right) =\sqrt { 8-2x } \) at which the slope of the tangent is -0.25 ?
-8
-4
-2
0
50.
The position of a particle moving along a horizontal line of any time t is given by s(t) = 3t2 -2t- 8. The time at which the particle is at rest is
t = 0
\(\\ \\ \\ t=\cfrac { 1 }{ 3 } \)
t =1
t = 3
1.
(c)
logically equivalent to p ∧ q
2.
(c)
3.
(c)
Chennai is in China or \(\sqrt 2\) is an integer
4.
(a)
5.
(b)
Z
6.
(b)
Multiplication
7.
(b)
(SxS) ⟶ S
8.
(d)
\(\frac{2}{3}\)
9.
(c)
0
10.
(a)
\(\frac{\pi}{6}\)
11.
(d)
\(\frac { { \pi }^{ 2 } }{ 4 } -2\)
12.
(d)
13.
(d)
\(\frac{2}{27}\)
14.
(b)
\(\frac{3\pi}{8}\)
15.
(b)
16.
(d)
0
17.
(b)
\(\frac{2}{9}\)
18.
(c)
\(\frac{8}{3}\)
19.
(c)
x cos x
20.
(d)
\(4\pi\)
21.
\({ f }_{ y }=\frac { 1 }{ 1+\frac { { x }^{ 2 } }{ { y }^{ 2 } } } \left( \frac { -x }{ { y }^{ 2 } } \right) =\frac { -\frac { x }{ { y }^{ 2 } } }{ \frac { { x }^{ 2 }+{ y }^{ 2 } }{ { { x }{ x }^{ 2 } } } } \)
= \(\frac { -x }{ { x }^{ 2 }+{ y }^{ 2 } } \)
\({ f }_{ x }=\frac { 1 }{ 1+\frac { { x }^{ 2 } }{ { { y }^{ 2 } } } } \left( \frac { 1 }{ y } \right) =\frac { \frac { 1 }{ y } }{ \frac { { x }^{ 2 }+{ y }^{ 2 } }{ { { y }^{ 2 } } } } \)
\(=\frac { y }{ { { x }^{ 2 }+{ y }^{ 2 } } } \)
\({ f }_{ xy }=\frac { \partial }{ \partial x } ({ f }_{ y })\)
\({ f }_{ xy }=-\left[ \frac { { (x }^{ 2 }+{ y }^{ 2 })(1)-x{ (2x) } }{ { ({ x }^{ 2 }+{ y }^{ 2 }) }^{ 2 } } \right] \)
\(=-\left[ \frac { { x }^{ 2 }+{ y }^{ 2 }-2{ x }^{ 2 } }{ { ({ x }^{ 2 }+{ y }^{ 2 }) }^{ 2 } } \right] \)
\(=-\left[ \frac { { y }^{ 2 }-{ x }^{ 2 } }{ { ({ x }^{ 2 }+{ y }^{ 2 }) }^{ 2 } } \right] \)
\(=\frac { x^{ 2 }-{ y }^{ 2 } }{ { ({ x }^{ 2 }+{ y }^{ 2 }) }^{ 2 } } \) ...(1)
\({ f }_{ xy }=\frac { \partial }{ \partial y } ({ f }_{ x })\)
\({ f }_{ xy }=\frac { ({ x }^{ 2 }+{ y }^{ 2 })(1)-y(2y) }{ ({ x }^{ 2 }+{ { y }^{ 2 }) }^{ 2 } } \)
\(=\frac { { x }^{ 2 }+{ y }^{ 2 }-2{ y }^{ 2 } }{ ({ x }^{ 2 }+{ { y }^{ 2 }) }^{ 2 } } \)
\(=\frac { { x }^{ 2 }-{ y }^{ 2 } }{ ({ x }^{ 2 }+{ { y }^{ 2 }) }^{ 2 } } \) ...(2)
∴ From (1) and (2), fxy = fyz
22.
(c)
yxy-1
23.
(b)
2xu
24.
(b)
0.4%
25.
(b)
26.
(d)
\(\frac { 2 }{ 3 } \)
27.
(b)
28.
(a)
1 and \(\frac { 1 }{ 2 } \)
29.
(a)
30.
(b)
2i- n, i = 0,1,2... n
31.
(d)
32.
(b)
mean exists but variance does not exist
33.
(b)
34.
(a)
P=Cekt
35.
(d)
0
36.
(c)
37.
(a)
y = Cex2
38.
(c)
p > q
39.
(d)
40.
(a)
41.
(c)
y = kx
42.
(a)
43.
(b)
\(\frac { { d }^{ 2 }y }{ { dx }^{ 2 } }+y=0\)
44.
(c)
45.
(a)
100
46.
(b)
\(x=\frac { \pi }{ 2 } \)
47.
(d)
2
48.
(a)
0
49.
(b)
-4
50.
(b)
\(\\ \\ \\ t=\cfrac { 1 }{ 3 } \)
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