Practice Questions

Q76.Let the position vectors of the points 𝐴, 𝐵, 𝐶 and 𝐷 be 5 ^i + 5 ^j + 2λ ^k, ^i + 2 ^j + 3 ^k, - 2 ^i + λ ^j + 4 ^k and - ^i + 5 ^j + 6 ^k . Let the set 𝑆= {𝜆∈ℝ: the points 𝐴, 𝐵, 𝐶 and 𝐷 are coplanar } . The 2 ∑𝜆∈𝑆(𝜆+ ) 2 is equal to 37 (1) 25 (2) 2 (3) 14 (4) 41

Q76.For any vector →𝑎= 𝑎1 ^𝑖+ 𝑎2 ^𝑗+ 𝑎3 ^𝑘, with 10𝑎𝑖< 1, 𝑖= 1, 2, 3, consider the following statements: 𝐴 : max𝑎1, 𝑎2, 𝑎3 ≤ →𝑎 𝐵 : | →𝑎| ≤3max𝑎1, 𝑎2, 𝑎3 JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper (1) Only 𝐵 is true (2) Only 𝐴 is true (3) Both 𝐴 and 𝐵 are true (4) Neither 𝐴 nor 𝐵 is true

Q76.The domain of f(x) = e2 loge x−(2x+3) (1) R −{−1, 3} (2) (2, ∞) −{3} (3) (−1, ∞) −{3} (4) R −{3}

Q76.Let f : R →R be a function defined by f(x) = log√m {√2(sin −2}, for some the range of f is [0, 2]. Then the value of m is _____ . (1) 5 (2) 3 (3) 2 (4) 4

Q76.Let A be a 3 × 3 matrix such that |adj(adj(adj. A))| = 124 . Then A−1adj A is equal to (1) 2√3 (2) √6 (3) 12 (4) 1

Q77.Let A be a symmetric matrix such that |A| = 2 and [23 1 1 2 2 A is s , then βs is equal to _________. α2

Q77.Let two vertices of a triangle 𝐴𝐵𝐶 be 2, 4, 6 and 0, - 2, - 5, and its centroid be 2, 1, - 1. If the image of the third vertex in the plane 𝑥+ 2𝑦+ 4𝑧= 11 is 𝛼, 𝛽, 𝛾, then 𝛼𝛽+ 𝛽𝛾+ 𝛾𝛼 is equal to (1) 70 (2) 76 (3) 74 (4) 72

Q77.Let S be the set of all values of θ ∈[−π, π] for which the system of linear equations x + y + √3z = 0 −x + + √7z = 0 (tan θ)y x + y + (tan θ)z = 0 has non-trivial solution.Then 120 π ∑0∈S θ is equal to (1) 20 (2) 40 (3) 30 (4) 10 + (α, β) ∪(γ, δ), then 18(α2 + β2 + γ 2 + δ2)

Q77.Let S = {x in S then : (1) n(S) = 2 and only one element in S is less then (2) n(S) = 1 and the element in S is more than 21 1 2 (3) n(S) = 1 and the element in S is less then 12 (4) n(S) = 0

Q77.Let f : R →R be a function such that f(x) = x2+2x+1 . Then x2+1 (1) f(x) is many-one in (−∞, −1) (2) f(x) is many-one in (1, ∞) (3) f(x) is one-one in [1, ∞) but not in (−∞, ∞) (4) f(x) is one-one in (−∞, ∞) JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper

Q77.If →𝑎, 𝑏, →𝑐 are three non-zero vectors and ^𝑛 is a unit vector perpendicular to →𝑐 such that →𝑎= 𝛼 𝑏- ^𝑛, 𝛼≠0 and →𝑏· →𝑐= 12, then →𝑐× →𝑎× →𝑏 is equal to: (1) 15 (2) 9 (3) 12 (4) 6

Q77.Let f : (0, 1) →R be a function defined by f(x) = 1−e−x1 , and g(x) = (f(−x) −f(x)). Consider two statements (I) g is an increasing function in (0, 1) (II) g is one-one in (0, 1) Then, (1) Only (I) is true (2) Only (II) is true (3) Neither (I) nor (II) is true (4) Both (I) and (II) are true x−7

Q77.If the system of equations x + 2y + 3z = 3, 4x + 3y −4z = 4 and 8x + 4y −λz = 9 + μ has infinitely many solutions, then the ordered pair (λ, μ) is equal to (1) ( 725 , 215 ) (2) ( −725 , −215 ) (3) ( 725 , −215 ) (4) ( −725 , 215 )

Q77.The number of functions f : {1, 2, 3, 4} →{a ∈Z : |a| ≤8} satisfying f(n) + n1 f(n + 1) = 1, ∀ n ∈{1, 2, 3} is (1) 3 (2) 4 (3) 1 (4) 2 λ (1 + | cos x|)Q78. , 0 < x < π2 |cos x| ⎧ μ, x = π2 is continuous at x = π2 , then If the function f(x) = ⎨ cot 6x cot 4x ⎩ e , π2 < x < π 9λ + 6 logc μ + μ6 −e6λ is equal to (1) 11 (2) 8 (3) 2e4 + 8 (4) 10

Q77.Let ABCD be a quadrilateral. If E and F are the mid points of the diagonals AC and BD respectively and −−−−−→ → → → → − + = k FE , then k is equal to (AB BC) (AD −DC) (1) 4 (2) −2 (3) 2 (4) −4

Q77.Let D be the domain of the function f(x) = sin−1(log3x( 6+2−5xlog3 x )). If the range of the function defined by g(x) = x −[x], ( [x] is the greatest integer function), is (α, β), then α2 + β5 is equal to (1) 135 (2) 45 (3) 46 (4) 136

Q77. x + 1 x x If x x + λ x = 89 (103x + 81), then λ, λ3 are the roots of the equation x x x + λ2 (1) 4x2 + 24x −27 = 0 (2) 4x2 −24x −27 = 0 (3) 4x2 + 24x + 27 = 0 (4) 4x2 −24x + 27 = 0

Q77.For the system of equations x + y + z = 6 x + 2y + αz = 10 x + 3y + 5z = β, which one of the following is NOT true? (1) System has no solution for α = 3, β = 24 (2) System has a unique solution for α = −3, β = 14 (3) System has infinitely many solutions for (4) System has a unique solution for α = 3, β ≠14 α = 3, β = 14

Q77.The range of the function f(x) = √3 −x + √2 + x is (1) [√5, √10] (2) [2√2, √11] (3) [√5, √13] (4) [√2, √7]

Q77.Let →𝑎= 2 ^i + 3 ^j + 4 ^k, →𝑏= ^i - 2 ^j - 2 ^k and →𝑐= - ^i + 4 ^j + 3 ^k . If →𝑑 is a vector perpendicular to both →𝑏 and →𝑐, 2 is equal to and →𝑎· →𝑑= 18, then |→𝑎× →𝑑| JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper (1) 640 (2) 680 (3) 720 (4) 760

Q77.Let a differentiable function 𝑓 satisfy 𝑓𝑥+ ∫3 𝑡𝑑𝑡= √𝑥+ 1, 𝑥≥3. Then 12𝑓8 is equal to: (1) 34 (2) 19 (3) 17 (4) 1

Q77.If 𝑦= 𝑦𝑥 is the solution curve of the differential equation 𝑑𝑦 𝑦tan𝑥= 𝑥sec𝑥, 0 ≤𝑥≤ 𝜋 𝑦0 = 1, then 𝑑𝑥+ 3, 𝜋 𝑦 is equal to 6 (1) 𝜋 - √3 2 (2) 𝜋 + √3 2√3 12 2 log𝑒 𝑒√3 12 2 loge e (3) 𝜋 - √3 2√3 (4) 𝜋 + √3 2 12 2 loge e 12 2 loge e√3

Q77.If the points 𝑃 and 𝑄 are respectively the circumcenter and the orthocentre of a ∆𝐴𝐵𝐶, then →𝑃𝐴+ →𝑃𝐵+ →𝑃𝐶 is equal to _______ (1) 2→𝑄𝑃 (2) 2→𝑃𝑄 (3) →𝑃𝑄 (4) →𝑄𝑃

Q77.Let 𝑃𝑄𝑅 be a triangle. The points𝐴, 𝐵 and 𝐶 are on the sides 𝑄𝑅, 𝑅𝑃 and 𝑃𝑄 respectively such that 𝑄𝐴 𝑅𝐵 𝑃𝐶 1 Then Area∆𝑃𝑄𝑅 is equal to 𝐴𝑅= 𝐵𝑃= 𝐶𝑄= 2. Area∆𝐴𝐵𝐶 (1) 4 (2) 1 5 (3) 2 (4) 2

Q77.For the differentiable function f : R −{0} −R, let 3f(x) + 2f( x1 ) = x1 −10, then f(3) + f ′( 41 ) is equal to (1) 33 (2) 8 5 (3) 29 (4) 13 5 1 sin 3x} = 3 Q78. 0≤x≤π{xmax −2 sin x cos x + (1) π+2−3√3 (2) π 6 (3) 0 (4) 5π+2+3√3 6