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Download DUET Master 2018 DU MA MSc Mathematics Question Paper With Answer Key

Download DUET (Delhi University Entrance Test conducted by the NTA) 2018 DU MA MSc Mathematics Question Paper With Solution Key

This post was last modified on 29 January 2020

This download link is referred from the post: DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA


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DU MA MSc Mathematics

Topic:- DU_J18_MA_MATHS_Topic01

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  1. The complete integral of the partial differential equation xpq + yq² - 1 = 0 where p = dz/dx and q = dz/dy is

    1. (z + b)² = 4(ax + y).
    2. z + b = 2(ax + y).
    3. z + b = 4(ax + y)².
    4. z + b = 2(ax + y)².
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    (z + b)² = 4(ax + y).

  2. Let P be the set of all the polynomials with rational coefficients and S be the set of all sequences of natural numbers. Then which one of the following statements is true?

    1. S is countable but P is not.
    2. --- Content provided by FirstRanker.com ---

    3. Both the sets P and S are uncountable.
    4. Both the sets P and S are countable.
    5. P is countable but S is not.

    Correct Answer :-

    P is countable but S is not.

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  3. For the differential equation

    x dy/dx + 6y = 3xy4/3

    consider the following statements:

    (i) The given differential equation is a linear equation.

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    (ii) The differential equation can be reduced to linear equation by the transformation V = y-1/3.

    (iii) The differential equation can be reduced to linear equation by the transformation V = x-1/3.

    Which of the above statements are true?

  4. Which one of the following statements is not true for Simpson's 1/3 rule to find approximate value of the definite integral I = ∫ f(x)dx?

    --- Content provided by FirstRanker.com ---

    1. If y₀ = f(0), y₁ = f(0.5), y₂ = f(1), the approximate value of I is 1/3 [y₀ + 3y₁ + y₂].

    2. The approximating function has odd number of points common with the function f(x).

    3. Simpson's 1/3 rule improves trapezoidal rule.

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    4. The function f(x) is approximated by a parabola.

    Correct Answer :-

    If y₀ = f(0), y₁ = f(0.5), y₂ = f(1), the approximate value of I is 1/3 [y₀ + 3y₁ + y₂].

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  5. The equation of the tangent plane to the surface z = 2x² - y² at the point (1, 1, 1) is

    1. x - y - 2z = 2.
    2. 4x - y - 3z = 1.
    3. 2x - y - 2z = 1.
    4. --- Content provided by FirstRanker.com ---

    5. 4x - 2y - z = 1.

    Correct Answer :-

    4x - 2y - z = 1.

  6. If {x,y} is an orthonormal set in an inner product space then the value of ||x - y|| + ||x + y || is

    --- Content provided by FirstRanker.com ---

    1. 2√2.
    2. 2 + √2.
    3. √2.
    4. 2.

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    2√2.

  7. Which one of the following spaces, with the usual metric, is not separable?

    1. The space C[a, b] of the set of all real valued continuous functions defined on [a, b].

    2. --- Content provided by FirstRanker.com ---

    3. The space l of all bounded real sequences with supremum metric.

    4. The Euclidean space Rn.

    5. The space l¹ of all absolutely convergent real sequences.

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    Correct Answer :-

    The space l of all bounded real sequences with supremum metric.

  8. Let G be an abelian group of order 2018 and f: G→ G be defined as f(x) = x5. Then

    --- Content provided by FirstRanker.com ---

    1. f is not injective.
    2. f is not surjective.
    3. there exists e ≠ x ∈ G such that f(x) = x-1.
    4. f is an automorphism of G.

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    f is an automorphism of G.

  9. If f: R → R is a continuous function such that

    f(x + y) = f(x) + f(y), for all x, y ∈ R,

    then

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    1. f is increasing if f (1) ≥ 0 and decreasing if f (1) ≤ 0.
    2. f is increasing if f (1) ≤ 0 and decreasing if f (1) ≥ 0.
    3. f is a not an increasing function.
    4. f is neither an increasing nor a decreasing function.

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    f is increasing if f (1) ≥ 0 and decreasing if f (1) ≤ 0.

  10. The central difference operator δ and backward difference operator ∇ are related as

    1. δ = √(1 − ∇)½.
    2. --- Content provided by FirstRanker.com ---

    3. δ = (1 + ∇)½.
    4. δ = √(1 - √).
    5. δ = √(1 + ∇).

    Correct Answer :-

    δ = √(1 - √).

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  11. How many continuous real functions f can be defined on R such that (f(x))² = x² for every x∈R?

    1. Infinitely many.
    2. None.
    3. 4.
    4. --- Content provided by FirstRanker.com ---

    5. 2.

    Correct Answer :-

    4.

  12. The greatest common divisor of 11 + 7i and 18-i in the ring of Gaussian integers Z[i] is

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    1. 3i.
    2. 1.
    3. 1+i.
    4. 2+i.

    Correct Answer :-

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    1.

  13. The complete integral of the partial differential equation

    ∂²z/∂x² - 2 ∂²z/∂x∂y + ∂²z/∂y² = ex+2y

    is

    --- Content provided by FirstRanker.com ---

    1. φ₁(y - x) + xφ₂(y + x) + ex+2y.
    2. φ₁(y + x) + xφ₂(y + x) + xex+2y.
    3. φ₁(y - x) + φ₂(y + x) + ex+2y.
    4. φ₁(y + x) + xφ₂(y + x) + ex+2y.

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    φ₁(y + x) + xφ₂(y + x) + ex+2y.

  14. If S = {(1, 0, i), (1, 2, 1)} ∈ C³ then S is

    1. span {(i, -½(i + 1), -1)}.
    2. span {(-i, -½(i + 1), 1)}.
    3. --- Content provided by FirstRanker.com ---

    4. span {(i, -½(i + 1), 1)}.
    5. span {(i, ½(i + 1), -1)}.

    Correct Answer :-

    span {(i, -½(i + 1), 1)}.

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  16. The improper integral ∫-∞ 2-x²dx is

    1. convergent and converges to 2.
    2. divergent.
    3. convergent and converges to 1/ln2.
    4. convergent and converges to -ln2.
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    convergent and converges to 1/ln2.

  17. Let f: R → R be a continuous function which takes irrational values at rational points and rational values at irrational points. Then which one of the following statements is true?

    1. f is uniformly continuous on Q.
    2. --- Content provided by FirstRanker.com ---

    3. f is uniformly continuous on R.
    4. f is uniformly continuous on Qc.
    5. No such function exists.

    Correct Answer :-

    No such function exists.

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  18. If f: [0,10] → R is defined as

    f(x) = { 0, 0 ≤ x < 2, 1, 2 ≤ x ≤ 5 0, 5 < x ≤ 10,

    and F(x) = ∫0x f(t)dt then

    1. F(x) = 3 for x ≤ 5.
    2. --- Content provided by FirstRanker.com ---

    3. F'(x) = f(x) for every x.
    4. F is not differentiable at x = 2 and x = 5.
    5. F is differentiable everywhere on [0, 10].

    Correct Answer :-

    F is not differentiable at x = 2 and x = 5.

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  19. The Maclaurin series expansion

    ln(1 + x) = x - x²/2 + x³/3 ...

    is valid

    1. only if x ∈ [-1,1].
    2. --- Content provided by FirstRanker.com ---

    3. if x > -1.
    4. only if x ∈ (-1,1].
    5. for every x ∈ R.

    Correct Answer :-

    only if x ∈ (-1,1].

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  20. If 4x = 2(mod 6) and 3x = 5(mod 8) then one of the value of x is

    1. 32
    2. 34
    3. 26
    4. --- Content provided by FirstRanker.com ---

    5. 23

    Correct Answer :-

    23

  21. If f(x) = limn→∞ Sn(x), where

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    Sn(x) = x/(x+1)(2x+1) + x/(2x+1)(3x+1) + ... + x/(nx+1)((n+1)x+1)

    then the function f is

    1. continuous nowhere.
    2. continuous everywhere.
    3. continuous everywhere except at countably many points.
    4. --- Content provided by FirstRanker.com ---

    5. continuous everywhere except at one point.

    Correct Answer :-

    continuous everywhere except at one point.

  22. The rate of change of f(x, y) = 4y - x² at the point (1, 5) in the direction from (1, 5) to the point (4, 3) is

    --- Content provided by FirstRanker.com ---

    1. -6/√5
    2. -14/√13
    3. -12/√5
    4. -19/√13

    Correct Answer :-

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    -14/√13

  23. Let G = {a₁, a₂,...., a₂₅} be a group of order 25. For b, c ∈ G let

    bG = {ba₁, ba₂,..., ba₂₅}, Gc = {a₁c, a₂c,...., a₂₅c}.

    Then

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    1. bG = Gc only if b = c.
    2. bG ⊆ Gc ∀ b, c ∈ G.
    3. bG = Gc only if b-1 = c.
    4. bG ⊆ Gc, if b ≠ c.

    Correct Answer :-

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  24. If (xn) is a sequence such that xn ≥ 0, for every n ∈ N and if limn→∞((-1)nxn) exists then which one of the following statements is true?

    1. The sequence (xn) is a Cauchy sequence.
    2. The sequence (xn) is not a Cauchy sequence.
    3. The sequence (xn) is unbounded.
    4. --- Content provided by FirstRanker.com ---

    5. The sequence (xn) is divergent.

    Correct Answer :-

    The sequence (xn) is a Cauchy sequence.

  25. If n > 2, then n5 - 5n³ + 4n is divisible by

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    1. 80
    2. 120
    3. 100
    4. 125

    Correct Answer :-

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    120

  26. Let

    S = ∩n=1 [2 - 1/n, 3 + 1/n].

    Then S equals

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    1. (2, 3].
    2. [2, 3].
    3. [2, 3).
    4. (2, 3).

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    [2, 3].

  27. If an = nsin(nπ/2) then

    1. lim sup an = +∞, lim inf an = -1.
    2. lim sup an = +∞, lim inf an = 0.
    3. --- Content provided by FirstRanker.com ---

    4. lim sup an = +∞, lim inf an = -∞.
    5. lim sup an = 1, lim inf an = -1.

    Correct Answer :-

    lim sup an = +∞, lim inf an = 0.

  28. --- Content provided by FirstRanker.com ---

  29. Let f: R²→ R be defined as f (x, y) = |x| + |y|. Then which one of the following statements is true?

    1. f is continuous at (0, 0) and fx(0,0) ≠ fy(0,0).
    2. f is continuous at (0, 0) and fx(0,0) = fy(0,0).
    3. f is discontinuous at (0, 0) and fx(0,0) = fy(0,0).
    4. f is continuous at (0, 0) but fx and fy does not exist at (0, 0).
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    f is continuous at (0, 0) but fx and fy does not exist at (0, 0).

  30. Let A and B be two subsets of a metric space X. If intA denotes the interior A of then which one of the following statements is not true?

    1. A ⊆ B ⇒ intA ⊆ intB.
    2. --- Content provided by FirstRanker.com ---

    3. int(A ∪ B) = intA ∪ intB.
    4. int(A ∩ B) = intA ∩ intB.
    5. int(A ∪ B) ⊇ intA ∪ intB.

    Correct Answer :-

    int(A ∪ B) = intA ∪ intB.

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  31. Which one of the following statements is false?

    1. A subring of a field is a subfield.
    2. A subring of the ring of integers Z, is an ideal of Z.
    3. A commutative ring with unity is a field if it has no proper ideals.
    4. --- Content provided by FirstRanker.com ---

    5. A field has no proper ideals.

    Correct Answer :-

    A subring of a field is a subfield.

  32. Let σ = (37125)(43216) ∈ S₇, the symmetric group of degree 7. The order of σ is

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    1. 7
    2. 4
    3. 5
    4. 2

    Correct Answer :-

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    4

  33. Let

    S = ∩n=1 [0, 1/n].

    Then which one of the following statements is true?

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    1. inf S > 0.
    2. sup S=1 and inf S = 0.
    3. sup S > 0.
    4. sup S = inf S = 0.

    Correct Answer :-

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    sup S = inf S = 0.

  34. The characteristics of the partial differential equation

    36 ∂²z/∂x² - 14 x12 ∂²z/∂x∂y - 8 ∂²z/∂y² = 0

    when it is of hyperbolic type are given by

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    1. x + 36/y6 = C₁, x - 36/y6 = C₂.
    2. x + 1/y6 = C₁, x - 1/y6 = C₂.
    3. x + 36/y7 = C₁, x - 36/y7 = C₂.
    4. x + 36/y7 = C₁, x + 36/y7 = C₂.

    Correct Answer :-

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    x + 1/y6 = C₁, x - 1/y6 = C₂.

  35. A bound for the error for the trapezoidal rule for the definite integral ∫01 1/(1+x²) dx is

    1. 1/6
    2. 2/25
    3. --- Content provided by FirstRanker.com ---

    4. 1/15
    5. 1/20

    Correct Answer :-

    1/6

  36. --- Content provided by FirstRanker.com ---

  37. Exact value of the definite integral ∫01 f(x)dx using Simpson's rule

    1. cannot be given for any polynomial.
    2. is given when f (x) is a polynomial of degree 4.
    3. is given when f (x) is a polynomial of degree 5.
    4. is given when f (x) is a polynomial of degree 3.
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    is given when f (x) is a polynomial of degree 3.

  38. Let p be a prime and let G be a non-abelian p-group. The least value of m such that pm|(G/Z(G)) is

    1. 0
    2. --- Content provided by FirstRanker.com ---

    3. 1
    4. 3
    5. 2

    Correct Answer :-

    0

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  39. If φ is Euler's Phi function then the value of φ(720) is

    1. 248
    2. 144
    3. 192
    4. --- Content provided by FirstRanker.com ---

    5. 72

    Correct Answer :-

  40. The total number of arithmetic operations required to find the solution of a system of n linear equations in n unknowns by Gauss elimination method is

    1. 2/3 n³ + 1/2 n² - 5/6 n.
    2. --- Content provided by FirstRanker.com ---

    3. 1/3 n³ + 1/2 n² - 1/6 n.
    4. 2/3 n³ + 3/2 n² - 7/6 n.
    5. 1/3 n³ + 3/2 n² - 5/6 n.

    Correct Answer :-

    2/3 n³ + 3/2 n² - 7/6 n.

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  41. If (xn) is a sequence defined as

    xn = [(5+n)/2n] for every n ∈ N

    where [.] denotes the greatest integer function then limn→∞ xn

    1. 1.
    2. --- Content provided by FirstRanker.com ---

    3. 1/2
    4. does not exist.
    5. 0.

    Correct Answer :-

    0.

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  42. Let R be a ring with characteristic n where n ≥ 2. If M is the ring of 2 × 2 matrices over R then the characteristic of M is

    1. 1.
    2. 0.
    3. n - 1.
    4. --- Content provided by FirstRanker.com ---

    5. n.

    Correct Answer :-

    n.

  43. If A = [2 1; a b] is a matrix with eigen values √6 and -√6, then the values of a and b are respectively,

    --- Content provided by FirstRanker.com ---

    1. 2 and -1.
    2. 2 and -2.
    3. 2 and 1.
    4. -2 and 1.

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    2 and -2.

  44. The dimension of the vector space of all 6 × 6 real skew-symmetric matrices is

    1. 36
    2. 21
    3. --- Content provided by FirstRanker.com ---

    4. 30
    5. 15

    Correct Answer :-

    15

  45. --- Content provided by FirstRanker.com ---

  46. Let (x₀, f(x₀)) = (0,1), (x₁, f(x₁)) = (1, a) and (x₂, f (x₂)) = (2,b). If the first order divided differences f[x₀, x₁] = 5 and f[x₁, x₂] = c and the second order divided difference f[x₀, x₁, x₂] = -3/2, then the values of a, b and c are

    1. 4, 2, 4.
    2. 2, 4, 6.
    3. 4, 6, 2.
    4. 6, 2, 4.
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    4, 6, 2.

  47. Let the polynomial f(x) = 3x5 + 15x4 - 20x3 + 10x + 20 ∈ Z[x], and f₀(x) be the polynomial in Z₃[x] obtained by reducing the coefficients of f(x) modulo 3. Which one of the following statements is true?

    1. f(x) is reducible over Q, f₀(x) is reducible over Z₃.
    2. --- Content provided by FirstRanker.com ---

    3. f(x) is irreducible over Q, f₀(x) is reducible over Z₃.
    4. f(x) is reducible over Q, f₀(x) is irreducible over Z₃.

      This download link is referred from the post: DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA

  48. --- Content provided by FirstRanker.com ---