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CBSE Class 11 Maths Question of the Day: chapters 1–4

40 CBSE Class 11 Mathematics puzzles from the Question of the Day rotation, chapters 1–4. Each puzzle is three board-style questions on one chapter, shown as an image with the question text written out below it; the answers, hints and step-marked solutions are on the daily puzzle page.

Chapter 1: Sets

Chapter 1: Sets
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator.
1. The set x: x is a prime number less than 12 in roster form is Options: A) 2, 3, 5, 7, 11; B) 1, 2, 3, 5, 7, 11; C) 2, 3, 5, 7, 9, 11; D) 3, 5, 7, 11
2. Which of the following is the empty set? Options: A) x ∈ ℕ: x < 2; B) x ∈ ℤ: x² = 4; C) 0; D) x ∈ ℝ: x² = -1
3. Which of these sets is a subset of every set? Options: A) 0; B) φ; C) 1; D) ℕ
Chapter 1: Sets · Intervals
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator.
1. The number of integers in the interval [-2, 3) is Options: A) 6; B) 4; C) 3; D) 5
2. In interval notation, x: x ∈ ℝ, -1 < x ≤ 4 is Options: A) (-1, 4); B) (-1, 4]; C) [-1, 4); D) [-1, 4]
3. (2, 7) ∩ [5, 9] equals Options: A) [5, 7]; B) [5, 7); C) (5, 7]; D) (2, 9]
Chapter 1: Sets · Union, intersection and difference
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator. Let U = 1, 2, 3, …, 12, A = x ∈ U: x is a factor of 12 and B = x ∈ U: x is prime.
1. A ∩ B equals Options: A) 2, 3, 5; B) 2, 3, 4, 6; C) 2, 3; D) 1, 2, 3
2. A - B equals Options: A) 4, 6, 12; B) 5, 7, 11; C) 1, 4, 6, 8, 12; D) 1, 4, 6, 12
3. (A ∪ B)' equals Options: A) 8, 9, 10; B) 5, 7, 8, 9, 10, 11; C) 1, 8, 9, 10; D) 8, 10
Chapter 1: Sets · Complements and De Morgan's laws
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator. Let U = 1, 2, 3, …, 9, A = 1, 3, 5, 7 and B = 3, 4, 5, 6.
1. A' ∩ B' equals Options: A) 1, 2, 4, 6, 7, 8, 9; B) 2, 8; C) 3, 5; D) 2, 8, 9
2. A' ∪ B' equals Options: A) 2, 8, 9; B) 2, 4, 6, 8, 9; C) 1, 2, 4, 6, 7, 8; D) 1, 2, 4, 6, 7, 8, 9
3. Which set is equal to A - B (for these sets, and for any sets A, B)? Options: A) A ∪ B'; B) (A ∩ B)'; C) A ∩ B'; D) A' ∩ B
Chapter 1: Sets · Elements and subsets
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator. Let A = 1, 2, 3, 4.
1. Which statement is true? Options: A) 1, 2 ⊂ A; B) 2, 3 ∈ A; C) 2, 3 ⊂ A; D) 2 ∈ A
2. The number of elements of A is Options: A) 5; B) 3; C) 4; D) 2
3. Which of these is a subset of A? Options: A) 1, 2; B) 2, 3; C) 1, 4; D) 2, 3, 4
Chapter 1: Sets · Operations on intervals
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator. Let A = [-3, 5) and B = (1, 8] (subsets of ℝ).
1. A ∪ B equals Options: A) [-3, 8); B) (-3, 8]; C) [-3, 8]; D) (1, 5)
2. A ∩ B equals Options: A) [-3, 8]; B) (1, 5); C) [1, 5]; D) (1, 5]
3. A - B equals Options: A) [-3, 1); B) (5, 8]; C) [5, 8]; D) [-3, 1]
Chapter 1: Sets · Sets from equations and conditions
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator. Let A = x ∈ ℝ: x² - 5x + 6 = 0, B = x ∈ ℕ: x < 4 and C = x ∈ ℤ: |x| ≤ 1.
1. Which statement is true? Options: A) A ∩ B = φ; B) A ⊂ B; C) B ⊂ A; D) A = B
2. (B - A) ∪ C equals Options: A) -1, 0, 1; B) 1; C) -1, 0, 1, 2, 3; D) -1, 0
3. A ∩ C equals Options: A) φ; B) 1; C) 0; D) 1, 2, 3
Chapter 1: Sets · Set identities
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator.
1. For all sets A and B, A - (A - B) equals Options: A) A ∩ B; B) A - B; C) B; D) A ∪ B
2. For all sets A and B in a universal set U, (A ∪ B)' ∪ (A' ∩ B) equals Options: A) U; B) A'; C) B'; D) A' ∩ B
3. In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option. Assertion (A): If A ∪ B = A ∩ B, then A = B. Reason (R): A ∩ B ⊂ A ⊂ A ∪ B for all sets A and B. Options: A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).; B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).; C) Assertion (A) is true but Reason (R) is false.; D) Assertion (A) is false but Reason (R) is true.
Chapter 1: Sets · Kinds of sets
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator.
1. Which one of these sets has infinitely many elements? Options: A) x ∈ ℤ: x² ≤ 100; B) x ∈ ℕ: 2x + 1 < 15; C) x ∈ ℝ: 0 < x < 1; D) x ∈ ℕ: x is a factor of 1000
2. Which of these sets is empty? Options: A) x ∈ ℤ: x² = 9; B) x ∈ ℕ: x² = 9; C) x ∈ ℕ: 3 < x < 4; D) x ∈ ℝ: 3 < x < 4
3. The number of elements of x ∈ ℤ: -2 ≤ x < 7, x odd is Options: A) 4; B) 5; C) 3; D) 6
Chapter 1: Sets · Roster and set-builder form
Three board-style questions on Sets (CBSE Class 11 Mathematics). No calculator. Let A = x: x ∈ ℕ, x² < 30.
1. A in roster form is Options: A) 1, 2, 3, 4, 5; B) 0, 1, 2, 3, 4, 5; C) 1, 2, 3, 4, 5, 6; D) 1, 2, 3, 4
2. Which of these sets is equal to A? Options: A) x: x ∈ ℤ, 0 < x < 6; B) x: x ∈ ℕ, x < 5; C) x: x is a whole number, x ≤ 5; D) x: x ∈ ℕ, x is a factor of 30
3. The number of elements of B = x: x ∈ ℤ, x² < 30 is Options: A) 11; B) 10; C) 5; D) 6

Chapter 2: Relations and Functions

Chapter 2: Relations and Functions
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator.
1. If (x + 1, y - 2) = (3, 1), then (x, y) is Options: A) (3, 2); B) (4, -1); C) (2, -1); D) (2, 3)
2. If n(A) = 3 and n(B) = 4, the number of relations from A to B is Options: A) 12; B) 7; C) 2¹²; D) 2⁷
3. The domain of f(x) = 1/(x - 3) is Options: A) ℝ; B) ℝ - 3; C) (3, ∞); D) ℝ - 0
Chapter 2: Relations and Functions · A relation on a set
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let A = 1, 2, 3, 4, 5, 6 and let R = (a, b): a, b ∈ A, b = a + 2.
1. The number of ordered pairs in R is Options: A) 3; B) 4; C) 6; D) 5
2. The domain of R is Options: A) 3, 4, 5, 6; B) 1, 2, 3, 4, 5, 6; C) 1, 2; D) 1, 2, 3, 4
3. The range of R is Options: A) 1, 2, 3, 4; B) 1, 2, 3, 4, 5, 6; C) 5, 6; D) 3, 4, 5, 6
Chapter 2: Relations and Functions · Relations and functions
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let A = 1, 2, 3 and B = 4, 5.
1. The number of relations from A to B is Options: A) 32; B) 12; C) 64; D) 6
2. Which relation from A to B is a function? Options: A) (1, 5), (2, 4), (3, 4), (3, 5); B) (1, 4), (2, 4), (3, 5); C) (1, 4), (1, 5), (2, 4), (3, 5); D) (1, 4), (2, 5)
3. The number of functions from A to B is Options: A) 9; B) 6; C) 64; D) 8
Chapter 2: Relations and Functions · A rational function
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let f(x) = (2x + 1)/(x - 3) (a real function).
1. The domain of f is Options: A) ℝ - -12; B) ℝ; C) ℝ - 3; D) ℝ - -3
2. f(4) equals Options: A) 7; B) 9/7; C) -9; D) 9
3. The value of x for which f(x) = 3 is Options: A) 10; B) 8; C) -10; D) 4
Chapter 2: Relations and Functions · Modulus and signum functions
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let f(x) = |x - 2| and let g be the signum function, g(x) = 1 for x > 0, g(0) = 0, g(x) = -1 for x < 0.
1. f(-1) + g(-1) equals Options: A) 2; B) 4; C) 3; D) -4
2. The range of f is Options: A) [2, ∞); B) ℝ; C) [0, ∞); D) (0, ∞)
3. In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option. Assertion (A): g(x) · |x| = x for every real number x. Reason (R): g(x) = x/(|x|) for every real number x. Options: A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).; B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).; C) Assertion (A) is true but Reason (R) is false.; D) Assertion (A) is false but Reason (R) is true.
Chapter 2: Relations and Functions · The greatest integer function
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let f(x) = [x], the greatest integer less than or equal to x.
1. f(-2.5) equals Options: A) -3; B) -2; C) 2; D) - 5/2
2. f(1.7) + f(-1.7) equals Options: A) 1; B) -2; C) -1; D) 0
3. The range of f on the domain [0, 3) is Options: A) 0, 1, 2, 3; B) 1, 2, 3; C) [0, 3); D) 0, 1, 2
Chapter 2: Relations and Functions · Algebra of real functions
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let f(x) = x² and g(x) = 2x + 1 (real functions).
1. (f + g)(2) equals Options: A) 25; B) 9; C) 8; D) 13
2. (fg)(-1) equals Options: A) 3; B) -1; C) 1; D) -3
3. The domain of f/g is Options: A) ℝ - 0; B) ℝ - 12; C) ℝ; D) ℝ - -12
Chapter 2: Relations and Functions · Domains with square roots
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator.
1. The domain of f(x) = √(9 - x²) is Options: A) (-3, 3); B) [0, 3]; C) ℝ - -3, 3; D) [-3, 3]
2. The range of f(x) = √(9 - x²) is Options: A) [0, 9]; B) [0, ∞); C) [0, 3]; D) [-3, 3]
3. The domain of h(x) = 1/(√(x² - 4)) is Options: A) (-∞, -2] ∪ [2, ∞); B) (-2, 2); C) ℝ - 2; D) (-∞, -2) ∪ (2, ∞)
Chapter 2: Relations and Functions · Equal ordered pairs
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. The ordered pairs (x + 1, y - 2) and (3, 5) are equal.
1. x equals Options: A) 3; B) 4; C) -2; D) 2
2. y equals Options: A) 3; B) 5; C) -3; D) 7
3. xy equals Options: A) 21; B) 14; C) 9; D) 10
Chapter 2: Relations and Functions · Cartesian products
Three board-style questions on Relations and Functions (CBSE Class 11 Mathematics). No calculator. Let A = 1, 2 and B = 3, 4, 5.
1. n(A × B) equals Options: A) 6; B) 5; C) 8; D) 9
2. Which ordered pair belongs to A × B? Options: A) (5, 2); B) (3, 1); C) (1, 1); D) (2, 5)
3. n(A × A × B) equals Options: A) 7; B) 8; C) 18; D) 12

Chapter 3: Trigonometric Functions

Chapter 3: Trigonometric Functions
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. 240^∘ in radians is Options: A) (4π)/3; B) (2π)/3; C) (5π)/4; D) (3π)/2
2. If sin x < 0 and tan x > 0, then x lies in Options: A) quadrant I; B) quadrant II; C) quadrant III; D) quadrant IV
3. The value of sin(31π)/3 is Options: A) -(√3)/2; B) (√3)/2; C) 12; D) -12
Chapter 3: Trigonometric Functions · Compound angles
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. cos(π)/12 equals Options: A) (√3)/2; B) (√6 + √2)/4; C) (√6 - √2)/4; D) (√3 + 1)/2
2. tan(5π)/12 equals Options: A) 2 + √3; B) 2 - √3; C) √3 + 1; D) 1/(√3)
3. sin(π)/12cos(π)/12 equals Options: A) 1/8; B) 1/4; C) 1/2; D) (√3)/4
Chapter 3: Trigonometric Functions · Double-angle identities
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. cos²(π)/8 - sin²(π)/8 equals Options: A) 1/2; B) (√3)/2; C) (√2)/2; D) 1
2. 1 - 2sin²(π)/12 equals Options: A) (√2)/2; B) 3/4; C) (√3)/2; D) 1/2
3. (2tan(π)/8)/(1 - tan²(π)/8) equals Options: A) 1; B) √3; C) (√3)/3; D) √2
Chapter 3: Trigonometric Functions · Ranges of trigonometric functions
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. The range of f(x) = 3sin x + 2 is Options: A) [-3, 3]; B) [-1, 3]; C) [-1, 5]; D) [2, 5]
2. The maximum value of sin x cos x over all real x is Options: A) 1; B) (√2)/2; C) 2; D) 1/2
3. Which number is NOT a value of sec x for any real x? Options: A) -1; B) 2; C) -32; D) 12
Chapter 3: Trigonometric Functions · Triple-angle identities
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. 3sin(π)/18 - 4sin³(π)/18 equals Options: A) 1/6; B) 3/2; C) 1/2; D) (√3)/2
2. 4cos³(2π)/9 - 3cos(2π)/9 equals Options: A) 1/2; B) - (√3)/2; C) (√3)/2; D) - 1/2
3. (3tan(π)/12 - tan³(π)/12)/(1 - 3tan²(π)/12) equals Options: A) 2 - √3; B) 1; C) √3; D) (√3)/3
Chapter 3: Trigonometric Functions · Sum-to-product formulae
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. sin(5π)/12 + sin(π)/12 equals Options: A) 1; B) (√6)/2; C) (√2)/2; D) (√3)/2
2. cos(5π)/12 - cos(π)/12 equals Options: A) (√2)/2; B) - (√6)/2; C) - 1/2; D) - (√2)/2
3. (sin 3x + sin x)/(cos 3x + cos x) simplifies to Options: A) cot 2x; B) tan 4x; C) tan 2x; D) tan x
Chapter 3: Trigonometric Functions · Complementary angles and a bound
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. cos²(π)/12 + cos²(5π)/12 equals Options: A) 2; B) 1; C) 1/2; D) (√3)/2
2. tan(π)/12 + tan(5π)/12 equals Options: A) 4; B) 2 √3; C) 2; D) 4 √3
3. In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option. Assertion (A): sin x + cos x ≤ √2 for every real x. Reason (R): sin x + cos x = √2sin(x + (π)/4) for every real x. Options: A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).; B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).; C) Assertion (A) is true but Reason (R) is false.; D) Assertion (A) is false but Reason (R) is true.
Chapter 3: Trigonometric Functions · Degrees, radians and arcs
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. 150^∘ in radians is Options: A) (2 π)/3; B) (3 π)/4; C) (5 π)/3; D) (5 π)/6
2. (7π)/4 radians in degrees is Options: A) 300^∘; B) 330^∘; C) 225^∘; D) 315^∘
3. An arc of a circle of radius 9 cm subtends an angle of (π)/3 radians at the centre. Its length is Options: A) 6 π cm; B) 27 π cm; C) π cm; D) 3 π cm
Chapter 3: Trigonometric Functions · Signs and values
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator.
1. sin 300^∘ equals Options: A) (√3)/2; B) - 1/2; C) 1/2; D) - (√3)/2
2. tan (3π)/4 equals Options: A) - (√3)/3; B) -1; C) 1; D) - √3
3. If sinθ < 0 and tanθ > 0, then θ lies in the Options: A) first quadrant; B) second quadrant; C) third quadrant; D) fourth quadrant
Chapter 3: Trigonometric Functions · From one ratio to the others
Three board-style questions on Trigonometric Functions (CBSE Class 11 Mathematics). No calculator. cos x = -35 and x lies in the second quadrant.
1. sin x equals Options: A) - 3/4; B) 4/5; C) - 4/5; D) 3/4
2. tan x equals Options: A) 3/4; B) - 4/3; C) 4/3; D) - 3/4
3. sin 2x equals Options: A) 24/25; B) - 7/25; C) 7/25; D) - 24/25

Chapter 4: Complex Numbers and Quadratic Equations

Chapter 4: Complex Numbers and Quadratic Equations
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator.
1. The value of i³⁵ is Options: A) 1; B) -i; C) i; D) -1
2. The modulus of 3 - 4i is Options: A) 7; B) 25; C) -1; D) 5
3. (2 + 3i)(1 - i) equals Options: A) 5 + i; B) -1 + i; C) 5 - i; D) 2 - 3i
Chapter 4: Complex Numbers and Quadratic Equations · Equal complex numbers
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator. Real numbers x and y satisfy x(1 + i) + y(2 - i) = 4 + i.
1. x equals Options: A) 1; B) 3; C) -2; D) 2
2. y equals Options: A) 3; B) 1; C) 2; D) -1
3. |x + iy| equals Options: A) √3; B) √5; C) 5; D) 3
Chapter 4: Complex Numbers and Quadratic Equations · The Argand plane
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator. The complex number z = -3 + 4i is shown as a point in the Argand plane.
1. The point lies in the Options: A) first quadrant; B) second quadrant; C) third quadrant; D) fourth quadrant
2. The distance of the point from the origin is Options: A) 25; B) 5; C) 7; D) 1
3. The point representing z is the reflection of the point z in Options: A) the origin; B) the line y = x; C) the real axis; D) the imaginary axis
Chapter 4: Complex Numbers and Quadratic Equations · Conjugates of products and quotients
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator. Let z = 2 + 3i and w = 1 - i.
1. zw equals Options: A) 5 + i; B) -1 - 5 i; C) -1 + 5 i; D) 5 - i
2. z z equals Options: A) 4 - 9 i; B) 13; C) √13; D) -5
3. The real part of z/w is Options: A) - 1/2; B) 5/2; C) 1/2; D) -1
Chapter 4: Complex Numbers and Quadratic Equations · Purely real or purely imaginary
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator. Let z = (a + 2i)/(1 - i), where a is real.
1. z is purely imaginary when a equals Options: A) 2; B) -2; C) 0; D) 1
2. z is real when a equals Options: A) -1; B) -2; C) 2; D) 0
3. In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option. Assertion (A): For z = 1 + i, the number z² is purely imaginary. Reason (R): The square of every complex number is purely imaginary. Options: A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).; B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).; C) Assertion (A) is true but Reason (R) is false.; D) Assertion (A) is false but Reason (R) is true.
Chapter 4: Complex Numbers and Quadratic Equations · An equation in z and its conjugate
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator. The complex number z satisfies z + 2 z = 6 - i.
1. z equals Options: A) 3 + i; B) 2 + i; C) 2 - i; D) 6 - i
2. |z|² equals Options: A) √5; B) 25; C) 5; D) 3
3. z² equals Options: A) 5 + 4 i; B) 4 + 4 i; C) 3 - 4 i; D) 3 + 4 i
Chapter 4: Complex Numbers and Quadratic Equations · Powers of i
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator.
1. i⁴³ equals Options: A) - i; B) i; C) -1; D) 1
2. i¹⁰ + i¹¹ + i¹² + i¹³ equals Options: A) 1; B) -1 - i; C) 2 i; D) 0
3. (1 + i)² equals Options: A) 0; B) 2 + 2 i; C) 2 i; D) 2
Chapter 4: Complex Numbers and Quadratic Equations · Multiplying complex numbers
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator. Let z = (3 - 2i)(1 + 4i).
1. Re(z) equals Options: A) 3; B) 10; C) 11; D) -5
2. Im(z) equals Options: A) 14; B) 10 i; C) -10; D) 10
3. z equals Options: A) 11 - 10 i; B) -11 + 10 i; C) 11 + 10 i; D) -11 - 10 i
Chapter 4: Complex Numbers and Quadratic Equations · Division and inverses
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator.
1. (5 + i)/(2 - 3i) equals Options: A) 7/13 + (17 i)/13; B) 1 + i; C) 7/13 - (17 i)/13; D) 10/13 - (3 i)/13
2. The multiplicative inverse of 3 + 4i is Options: A) 3/5 - (4 i)/5; B) -3 - 4 i; C) 3/25 + (4 i)/25; D) 3/25 - (4 i)/25
3. The real part of 1/(1 - i) is Options: A) - 1/2; B) 0; C) 1/2; D) 1
Chapter 4: Complex Numbers and Quadratic Equations · Modulus
Three board-style questions on Complex Numbers and Quadratic Equations (CBSE Class 11 Mathematics). No calculator.
1. |6 - 8i| equals Options: A) 10; B) 14; C) 2; D) 100
2. |(3 + 4i)(5 - 12i)| equals Options: A) 18; B) 17; C) 63; D) 65
3. |(1 + 2i)/(2 - i)| equals Options: A) 5; B) 1/5; C) 1; D) √5

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