Read all CBSE class 12th maths answer key 2021 – 2022 with question paper.

- MATHEMATICS सत्र – I / Term – I
- निर्धारित समय – 90 मिनट Time allowed: 90 Minutes.
- अधिकतम अंक : 40 Maximum Marks : 40

**CBSE class 12 maths answers key: Board Exam Question Paper and Answers Key 2021-22 Table**

Table of Contents

Q1: 1 . Differential of log [ log ( log x5 ) ] w.r.t. x is

5 x log ( r ) log ( log ) ( c ) 5×4 log ( ) log ( log x³ ) ( b ) ( d ) x log ( logº ) 5×4 log log ( log x³ )

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**Q2: The number of all possible matrices of order 2 x 3 with each entry 1 or 2 is**

- 16
- 6
- 64
- 24

**(C) 64** is the correct answer.

**Q3: A function f : R → R is defined as f(x) = x3 + 1. Then the function has**

- (a) no minimum value
- (b) no maximum value
- (c) both maximum and minimum value
- (d) neither maximum value nor minimum value

**(d) neither maximum value nor minimum value** is the correct answer.

**Q4: If siny=xcos(a+y), then dx/dy is**

Answer: **(a)**

**Q5: The points on the curve x2/9 + y2/25 = 1, where tangenct is parallel to x-axis are**

- (a) (±5, 0)
- (b) (0, ±5)
- (c) (0, ±3)
- (d) (±3, 0)

Answer: **(a) (0, ±5)**.

**6. Three points P(2x, x + 3), Q(0, x) and R(x + 3, x + 6) are collinear, then x is equal to**

- (a) 0
- (b) 2
- (c) 3
- (d) 1

Answer: **(d) 1**

**Q9: If a matrix A is both symmetric and skew symmetric , then A is necessarily**

- ( a ) Diagonal matrix
- (b) Zero square matrix
- (c) Square matrix
- ( d ) Identity matrix

Answer: **(c) Square matrix.**

**Q10: Lat set X = (1. 2, 3) and a relation R is defined in X as : R = ((1, 3), (2, 2), ****(3. 2)), then minimum ordered pairs which ahould be added in relation R to make it reflexive and symmetric are**

- (a) {(1. 1). (2. 3). (1. 2)}
- (b) {(3, 3), (3. 1). 0, 2)}
- (c) {(1. 1), (3. 3). (3. 1). (2,3)}
- (d) {(1. 1). (3, 3), (3. 1), (1. 2)}

Answer: **(c) {(1. 1), (3. 3). (3. 1). (2,3)}**.

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