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DU MA MSc Mathematics
Topic:- DU_J18_MA_MATHS_Topic01
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The complete integral of the partial differential equation xpq + yq² - 1 = 0 where p = dz/dx and q = dz/dy is
- (z + b)² = 4(ax + y).
- z + b = 2(ax + y).
- z + b = 4(ax + y)².
- z + b = 2(ax + y)².
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Correct Answer :-
(z + b)² = 4(ax + y).
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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?
- S is countable but P is not.
- Both the sets P and S are uncountable.
- Both the sets P and S are countable.
- P is countable but S is not.
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Correct Answer :-
P is countable but S is not.
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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?
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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?
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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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The approximating function has odd number of points common with the function f(x).
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Simpson's 1/3 rule improves trapezoidal rule.
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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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The equation of the tangent plane to the surface z = 2x² - y² at the point (1, 1, 1) is
- x - y - 2z = 2.
- 4x - y - 3z = 1.
- 2x - y - 2z = 1.
- 4x - 2y - z = 1.
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Correct Answer :-
4x - 2y - z = 1.
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If {x,y} is an orthonormal set in an inner product space then the value of ||x - y|| + ||x + y || is
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- 2√2.
- 2 + √2.
- √2.
- 2.
Correct Answer :-
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2√2.
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Which one of the following spaces, with the usual metric, is not separable?
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The space C[a, b] of the set of all real valued continuous functions defined on [a, b].
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The space l∞ of all bounded real sequences with supremum metric.
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The Euclidean space Rn.
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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.
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Let G be an abelian group of order 2018 and f: G→ G be defined as f(x) = x5. Then
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- f is not injective.
- f is not surjective.
- there exists e ≠ x ∈ G such that f(x) = x-1.
- f is an automorphism of G.
Correct Answer :-
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f is an automorphism of G.
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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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- f is increasing if f (1) ≥ 0 and decreasing if f (1) ≤ 0.
- f is increasing if f (1) ≤ 0 and decreasing if f (1) ≥ 0.
- f is a not an increasing function.
- f is neither an increasing nor a decreasing function.
Correct Answer :-
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f is increasing if f (1) ≥ 0 and decreasing if f (1) ≤ 0.
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The central difference operator δ and backward difference operator ∇ are related as
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- δ = √(1 − ∇)½.
- δ = (1 + ∇)½.
- δ = √(1 - √)-½.
- δ = √(1 + ∇)-½.
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Correct Answer :-
δ = √(1 - √)-½.
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How many continuous real functions f can be defined on R such that (f(x))² = x² for every x∈R?
- Infinitely many.
- None.
- 4.
- 2.
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Correct Answer :-
4.
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The greatest common divisor of 11 + 7i and 18-i in the ring of Gaussian integers Z[i] is
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- 3i.
- 1.
- 1+i.
- 2+i.
Correct Answer :-
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1.
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The complete integral of the partial differential equation
∂²z/∂x² - 2 ∂²z/∂x∂y + ∂²z/∂y² = ex+2y
is
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- φ₁(y - x) + xφ₂(y + x) + ex+2y.
- φ₁(y + x) + xφ₂(y + x) + xex+2y.
- φ₁(y - x) + φ₂(y + x) + ex+2y.
- φ₁(y + x) + xφ₂(y + x) + ex+2y.
Correct Answer :-
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φ₁(y + x) + xφ₂(y + x) + ex+2y.
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If S = {(1, 0, i), (1, 2, 1)} ∈ C³ then S⊥ is
- span {(i, -½(i + 1), -1)}.
- span {(-i, -½(i + 1), 1)}.
- span {(i, -½(i + 1), 1)}.
- span {(i, ½(i + 1), -1)}.
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Correct Answer :-
span {(i, -½(i + 1), 1)}.
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The improper integral ∫-∞∞ 2-x²dx is
- convergent and converges to 2.
- divergent.
- convergent and converges to 1/ln2.
- convergent and converges to -ln2.
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Correct Answer :-
convergent and converges to 1/ln2.
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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?
- f is uniformly continuous on Q.
- f is uniformly continuous on R.
- f is uniformly continuous on Qc.
- No such function exists.
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Correct Answer :-
No such function exists.
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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
- F(x) = 3 for x ≤ 5.
- F'(x) = f(x) for every x.
- F is not differentiable at x = 2 and x = 5.
- F is differentiable everywhere on [0, 10].
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Correct Answer :-
F is not differentiable at x = 2 and x = 5.
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The Maclaurin series expansion
ln(1 + x) = x - x²/2 + x³/3 ...
is valid
- only if x ∈ [-1,1].
- if x > -1.
- only if x ∈ (-1,1].
- for every x ∈ R.
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Correct Answer :-
only if x ∈ (-1,1].
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If 4x = 2(mod 6) and 3x = 5(mod 8) then one of the value of x is
- 32
- 34
- 26
- 23
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Correct Answer :-
23
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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
- continuous nowhere.
- continuous everywhere.
- continuous everywhere except at countably many points.
- continuous everywhere except at one point.
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Correct Answer :-
continuous everywhere except at one point.
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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
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- -6/√5
- -14/√13
- -12/√5
- -19/√13
Correct Answer :-
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-14/√13
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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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- bG = Gc only if b = c.
- bG ⊆ Gc ∀ b, c ∈ G.
- bG = Gc only if b-1 = c.
- bG ⊆ Gc, if b ≠ c.
Correct Answer :-
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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?
- The sequence (xn) is a Cauchy sequence.
- The sequence (xn) is not a Cauchy sequence.
- The sequence (xn) is unbounded.
- The sequence (xn) is divergent.
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Correct Answer :-
The sequence (xn) is a Cauchy sequence.
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If n > 2, then n5 - 5n³ + 4n is divisible by
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- 80
- 120
- 100
- 125
Correct Answer :-
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120
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Let
S = ∩n=1∞ [2 - 1/n, 3 + 1/n].
Then S equals
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- (2, 3].
- [2, 3].
- [2, 3).
- (2, 3).
Correct Answer :-
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[2, 3].
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If an = nsin(nπ/2) then
- lim sup an = +∞, lim inf an = -1.
- lim sup an = +∞, lim inf an = 0.
- lim sup an = +∞, lim inf an = -∞.
- lim sup an = 1, lim inf an = -1.
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Correct Answer :-
lim sup an = +∞, lim inf an = 0.
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Let f: R²→ R be defined as f (x, y) = |x| + |y|. Then which one of the following statements is true?
- f is continuous at (0, 0) and fx(0,0) ≠ fy(0,0).
- f is continuous at (0, 0) and fx(0,0) = fy(0,0).
- f is discontinuous at (0, 0) and fx(0,0) = fy(0,0).
- f is continuous at (0, 0) but fx and fy does not exist at (0, 0).
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Correct Answer :-
f is continuous at (0, 0) but fx and fy does not exist at (0, 0).
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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?
- A ⊆ B ⇒ intA ⊆ intB.
- int(A ∪ B) = intA ∪ intB.
- int(A ∩ B) = intA ∩ intB.
- int(A ∪ B) ⊇ intA ∪ intB.
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Correct Answer :-
int(A ∪ B) = intA ∪ intB.
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Which one of the following statements is false?
- A subring of a field is a subfield.
- A subring of the ring of integers Z, is an ideal of Z.
- A commutative ring with unity is a field if it has no proper ideals.
- A field has no proper ideals.
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Correct Answer :-
A subring of a field is a subfield.
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Let σ = (37125)(43216) ∈ S₇, the symmetric group of degree 7. The order of σ is
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- 7
- 4
- 5
- 2
Correct Answer :-
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4
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Let
S = ∩n=1∞ [0, 1/n].
Then which one of the following statements is true?
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- inf S > 0.
- sup S=1 and inf S = 0.
- sup S > 0.
- sup S = inf S = 0.
Correct Answer :-
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sup S = inf S = 0.
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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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- x + 36/y6 = C₁, x - 36/y6 = C₂.
- x + 1/y6 = C₁, x - 1/y6 = C₂.
- x + 36/y7 = C₁, x - 36/y7 = C₂.
- x + 36/y7 = C₁, x + 36/y7 = C₂.
Correct Answer :-
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x + 1/y6 = C₁, x - 1/y6 = C₂.
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A bound for the error for the trapezoidal rule for the definite integral ∫01 1/(1+x²) dx is
- 1/6
- 2/25
- 1/15
- 1/20
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Correct Answer :-
1/6
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Exact value of the definite integral ∫01 f(x)dx using Simpson's rule
- cannot be given for any polynomial.
- is given when f (x) is a polynomial of degree 4.
- is given when f (x) is a polynomial of degree 5.
- is given when f (x) is a polynomial of degree 3.
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Correct Answer :-
is given when f (x) is a polynomial of degree 3.
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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
- 0
- 1
- 3
- 2
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Correct Answer :-
0
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If φ is Euler's Phi function then the value of φ(720) is
- 248
- 144
- 192
- 72
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Correct Answer :-
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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
- 2/3 n³ + 1/2 n² - 5/6 n.
- 1/3 n³ + 1/2 n² - 1/6 n.
- 2/3 n³ + 3/2 n² - 7/6 n.
- 1/3 n³ + 3/2 n² - 5/6 n.
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Correct Answer :-
2/3 n³ + 3/2 n² - 7/6 n.
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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
- does not exist.
- 0.
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Correct Answer :-
0.
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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.
- 0.
- n - 1.
- n.
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Correct Answer :-
n.
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If A = [2 1; a b] is a matrix with eigen values √6 and -√6, then the values of a and b are respectively,
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- 2 and -1.
- 2 and -2.
- 2 and 1.
- -2 and 1.
Correct Answer :-
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2 and -2.
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The dimension of the vector space of all 6 × 6 real skew-symmetric matrices is
- 36
- 21
- 30
- 15
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Correct Answer :-
15
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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
- 4, 2, 4.
- 2, 4, 6.
- 4, 6, 2.
- 6, 2, 4.
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Correct Answer :-
4, 6, 2.
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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?
- f(x) is reducible over Q, f₀(x) is reducible over Z₃.
- f(x) is irreducible over Q, f₀(x) is reducible over Z₃.
- 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
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