CBSE Class 12 Mathematics Set 2- (65/5/2) Question Paper 2026 with Solution PDF

If \( A = \begin{bmatrix} \sin \theta & \cos \theta \\ -\cos \theta & \sin \theta \end{bmatrix} \) and \( A + A' = I \), then \( \theta \) is equal to :

• (A) \( 0 \)
  
• (B) \( \frac{\pi}{6} \)
  
• (C) \( \frac{\pi}{3} \)
  
• (D) \( \pi \)

If \( A \) is a symmetric matrix, then for any matrix \( B \) of order same as \( A \), \( BAB' \) is a/an :

• (A) Skew symmetric matrix
  
• (B) Identity matrix
  
• (C) Symmetric matrix
  
• (D) Null matrix

Let \( A = \begin{bmatrix} 0 & -3 & 4 \\ 1 & 0 & 2 \end{bmatrix} \) and \( B = \begin{bmatrix} -3 & 0 & 1 \\ 2 & 4 & 0 \end{bmatrix} \). If \( A + B + C = O \), then matrix \( C \) is :

• (A) \( \begin{bmatrix} -3 & -3 & 5\\ 3 & 4 & 2 \end{bmatrix} \)
  
• (B) \( \begin{bmatrix} 3 & 3 & 5 \\ -3 & -4 & -2 \end{bmatrix} \)
  
• (C) \( \begin{bmatrix} 3 & 3 & -5 \\ -3 & -4 & -2 \end{bmatrix} \)
  
• (D) \( \begin{bmatrix} -3 & -3 & -5 \\ 3 & 4 & 2 \end{bmatrix} \)

For the inverse trigonometric functions, which of the following Principal Value Branch is not correctly defined ?

• (A) \( \tan^{-1} : \mathbb{R} \to \left( -\frac{\pi}{2}, \frac{\pi}{2} \right) \)
  
• (B) \( \sec^{-1} : \mathbb{R} - (-1, 1) \to [0, \pi] - \left\{ \frac{\pi}{2} \right\} \)
  
• (C) \( \cot^{-1} : \mathbb{R} \to (0, \pi) \)
  
• (D) \( \text{cosec}^{-1} : \mathbb{R} - (-1, 1) \to \left[ -\frac{\pi}{2}, \frac{\pi}{2} \right] \)

If \[ f(x)= \begin{cases} \dfrac{x^2-4x-5}{x+1}, & x\neq -1 \\ k, & x=-1 \end{cases} \] is continuous at \(x=-1\), then the value of \(k\) is:

• (A) Any real value
  
• (B) \( 6 \)
  
• (C) \( -1 \)
  
• (D) \( -6 \)

If \( A \) is a non-singular matrix, then which of the following is not true ?

• (A) \( \text{adj } A \) is singular
  
• (B) \( (\text{adj } A)^{-1} = (\text{adj } A^{-1}) \)
  
• (C) \( |A| \neq 0 \)
  
• (D) \( A^{-1} \) exists

Absolute minimum value of \( f(x) = (x - 2)^2 + 5 \) in the interval \( [-3, 2] \) is :

• (A) \( -3 \)
  
• (B) \( 2 \)
  
• (C) \( 5 \)
  
• (D) \( 30 \)

If the area of \( \triangle ABC \) with vertices \( A(3, 1) \), \( B(-2, 1) \) and \( C(0, k) \) is 5 sq. units, then values of \( k \) are :

• (A) \( 3, 1 \)
  
• (B) \( -1, 3 \)
  
• (C) \( -1, 2 \)
  
• (D) \( 0, 2 \)

Derivative of \( \cos^{-1} \left( \frac{\sin x + \cos x}{\sqrt{2}} \right) \), \( -\frac{\pi}{4} < x < \frac{\pi}{4} \) with respect to \( x \) is :

• (A) \( -1 \)
  
• (B) \( 1 \)
  
• (C) \( \frac{\pi}{4} \)
  
• (D) \( -\frac{\pi}{4} \)

The integral \( \int \sqrt{\frac{1 - \cos 2x}{1 + \cos 2x}} \, dx \) is equal to :

• (A) \( \log |\sec^2 x| + C \)
  
• (B) \( \log |\cos x| + C \)
  
• (C) \( \log |1 + \cos 2x| + C \)
  
• (D) \( \log |\sec x| + C \)

The value of \( \int_{0}^{1} \frac{1}{3x - 4} \, dx \) is :

• (A) \( \frac{1}{3} \log 4 \)
  
• (B) \( -\frac{1}{3} \log 4 \)
  
• (C) \( \log (-4) \)
  
• (D) \( \log 4 \)

The general solution for the differential equation \( \frac{dy}{dx} = e^{3x-y} \) is :

• (A) \( 3e^y = e^{3x} + C \)
  
• (B) \( \log (3x - y) = C \)
  
• (C) \( e^{3x-y} = C \)
  
• (D) \( -e^y + 3e^{3x} = C \)

The order and degree of the differential equation \[ 1+\left(\frac{d^3y}{dx^3}\right)^3 = \lambda \frac{d^2y}{dx^2} \] is: 

• (A) Order = \( 3 \), Degree = \( 3 \)
  
• (B) Order = \( 2 \), Degree = \( 2 \)
  
• (C) Order = \( 3 \), Degree = \( 1 \)
  
• (D) Order = \( 2 \), Degree = \( 1 \)

An ant is observed crawling on a sheet of paper along a straight line given by equation \( y = 2x - 4 \). Area of the surface covered by the ant bounded by y-axis, x-axis and \( x = 1 \) is :

• (A) \( 1 \text{ sq. unit} \)
  
• (B) \( 3 \text{ sq. units} \)
  
• (C) \( 2 \text{ sq. units} \)
  
• (D) \( 4 \text{ sq. units} \)

If position vector \( \vec{p} \) of a point \( (24, n) \) is such that \( |\vec{p}| = 25 \), then the value of \( n \) is :

• (A) \( \pm 49 \)
  
• (B) \( \pm 5 \)
  
• (C) \( \pm 1 \)
  
• (D) \( \pm 7 \)

The corner points of the feasible region determined by the system of linear constraints are \( (0, 0) \), \( (0, 40) \), \( (20, 40) \), \( (60, 20) \) and \( (60, 0) \). If the objective function of an LPP is \( Z = 4x + 3y \), then the maximum value is :

• (A) \( 200 \)
  
• (B) \( 300 \)
  
• (C) \( 240 \)
  
• (D) \( 120 \)

If \[ 3P(A)=P(B)=\frac{3}{5} \] and \[ P(A|B)=\frac{2}{3}, \] then \(P(A\cup B)\) is: 

• (A) \( \frac{3}{5} \)
  
• (B) \( \frac{1}{5} \)
  
• (C) \( \frac{2}{15} \)
  
• (D) \( \frac{2}{5} \)

If vectors \( \vec{a} = 3\hat{i} + 2\hat{j} + \lambda\hat{k} \) and \( \vec{b} = 2\hat{i} - 4\hat{j} + 5\hat{k} \), represent the two strips of the Red Cross sign placed outside a doctor's clinic, then the value of \( \lambda \) is :

• (A) \( 1 \)
  
• (B) \( \frac{5}{2} \)
  
• (C) \( \frac{2}{5} \)
  
• (D) \( 0 \)

Assertion (A): A relation \(R\) on the set \(\{1,2,3\}\) defined as \[ R=\{(1,1),(1,2),(2,1),(2,2),(3,3)\} \] is an equivalence relation. 
 
Reason (R): A relation that is reflexive, symmetric and transitive is an equivalence relation.

• (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  
• (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  
• (C) Assertion (A) is true, but Reason (R) is false.
  
• (D) Assertion (A) is false, but Reason (R) is true.

Assertion (A) : Consider a Linear Programming Problem with minimise \( Z = x + 2y \) subject to constraints \( 2x + y \geq 3, x + 2y \geq 6, x, y \geq 0 \) which gives minimum \( Z \) at infinitely many points. The corner points of feasible region are \( (0, 3) \) and \( (6, 0) \).
Reason (R) : If two corner points produce the same minimum value of the objective function, then every point on the line segment joining the points will give the same minimum value.

• (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  
• (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  
• (C) Assertion (A) is true, but Reason (R) is false.
  
• (D) Assertion (A) is false, but Reason (R) is true.

Evaluate \(\sin\left[\cos^{-1}\left(\cos\dfrac{7\pi}{6}\right)\right]\).

Three honey bees were found flying along the vectors \( \vec{a} = 2\hat{i} - 3\hat{j} + \hat{k} \), \( \vec{b} = 4\hat{j} - 2\hat{k} \) and \( \vec{c} = 3\hat{i} + 2\hat{k} \) respectively. Find the value of \( \lambda \) such that the path for \( \vec{a} + \lambda \vec{b} \) is perpendicular to \( \vec{c} \).

If \( A, B \) and \( C \) be three non-collinear points such that \( \vec{AB} = \hat{i} + 2\hat{j} - \hat{k} \) and \( \vec{AC} = 2\hat{i} - 3\hat{j} \), then find the area of \( \triangle ABC \).

Determine the interval(s) in which \(f(x)=5x^{3/2}-3x^{5/2}\), \(x>0\) is increasing.

Find the angle between the following pair of lines : \( \frac{x-2}{3} = \frac{y+5}{2} = \frac{1-z}{-6} \) and \( \frac{x-7}{1} = \frac{y}{2} = \frac{6-z}{-2} \).

Differentiate \( x^x \) with respect to \( x \log x \).

If \( y = P \cos ux + Q \sin ux \), show that \( \frac{d^2y}{dx^2} + u^2y = 0 \).

A thin metallic wire in the shape of a circular ring has its enclosed area increasing at a uniform rate when heated. Show that the rate of change of circumference varies inversely as the radius.

Solve the following Linear Programming Problem graphically :
Maximize \( Z = \frac{2x}{5} + \frac{3y}{10} \)
subject to constraints
\( 2x + y \leq 1000 \)
\( x + y \leq 800 \)
\( x, y \geq 0 \).

Solve the differential equation \(y \, dx + (x - y^3) \, dy = 0\).

Find : \( \int \frac{x - \sin x}{1 - \cos x} \, dx \).

Evaluate : \( \int_0^2 \frac{1}{\sqrt{x^2 + 2x + 3}} \, dx \).

A die is rolled. Consider events : \( A = \{1, 2, 5\}, B = \{3, 5\}, C = \{2, 3, 4, 5\} \) and hence find : (i) \( P(A|C) \) and \( P(C|A) \) (ii) \( P(A \cap B | C) \) and \( P(A \cup B | C) \)

A box contains 6 cards numbered 1 to 6. A student is asked to pick up two cards, one by one after replacement and note down the numbers on the cards. Let A be the event of getting sum of the numbers on two cards as 10, and B, the event of a number other than 4 on the first card selected.
Find P(A and B) and find whether the events A and B are independent events or not.

Let three toys A, B and C be placed in the same straight line. If the position vectors of A, B and C are \( 55\hat{i} - 2\hat{j} \), \( 5\hat{i} + 8\hat{j} \) and \( a\hat{i} - 52\hat{j} \) respectively, find the value of ‘a’.

If \( \vec{a} \), \( \vec{b} \) and \( \vec{c} \) are unit vectors, then prove that \( |\vec{a} - \vec{b}|^2 + |\vec{b} - \vec{c}|^2 + |\vec{c} - \vec{a}|^2 \leq 9 \).

Find the cost (per kg) of each fertilizer A, B and C that a farmer needs to buy, such that 1 kg each of fertilizer A and C added to 2 kg of B costs him ₹ 400. Also, the cost of each kg of fertilizer B and C added together is equal to the cost of 1 kg of fertilizer A. However, the cost of 3 kg of fertilizer B added to ₹ 200 is the same as the cost of 1 kg of fertilizer A and C together. Use the matrix method to find the solution.

Find the foot of the perpendicular from the point \( (0, 2, 3) \) on the line \( \frac{x+3}{5} = \frac{y-1}{2} = \frac{z+4}{3} \) and hence find the length of the perpendicular.

Find the value of \( p \) if the shortest distance between the lines \( \vec{r} = (\hat{i} + 2\hat{j} + \hat{k}) + \lambda(\hat{i} - \hat{j} + \hat{k}) \) and \( \vec{r} = (p\hat{i} - \hat{j} - \hat{k}) + \mu(2\hat{i} + \hat{j} + 2\hat{k}) \) is \( \frac{3}{\sqrt{2}} \) units.

Sketch the curve described by the equation \(\{(x, y) : 9x^2 + 16y^2 = 144\}\) and find the exact total area of the closed region enclosed by it using definite integration.

If \[ y\sqrt{x^2+1}=\log\left(\sqrt{x^2+1}-x\right), \] show that \[ (x^2+1)\frac{dy}{dx}+xy+1=0. \] 

Find the differential of \( x^{\cot x} + \frac{2x^2-3}{2x^2-x+2} \) with respect to \( x \).

There are three types of vaccines \( A_1, A_2, A_3 \), available in the market to protect the population of the country from spread of certain infection. According to a survey conducted, it was found that 25% of the population was given Vaccine \( A_1 \), 35% of the population was given Vaccine \( A_2 \) and 40% of the population was given Vaccine \( A_3 \). The survey also stated that the probabilities that Vaccines \( A_1, A_2 \) and \( A_3 \) would protect against the infection were 60%, 55% and 50% respectively. Based on the above information, find the probability that:

A company produces cylindrical tumblers, open from the top. Since they want uniformity in the product, they fix the surface area of the tumblers produced. If for a tumbler, \( V \) is its volume, \( h \) the height and \( r \) the radius of the circular base, then:

A school wants the students of class XII to do a project on ‘Sustainability’ keeping the world environment in mind. They select the student participants on the basis of an essay writing competition.
7 students out of 80 are selected for the project and are categorized into two sets such that :
Girl students belong to Set A = \( A = \{G_1, G_2, G_3, G_4\} \) and
Boy students belong to Set B = \( B = \{B_1, B_2, B_3\} \) .