This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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B.Sc. Part-1 (Semester-II) Examination
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MATHEMATICS
(Differential Equations : Ordinary & Partial)
Paper—III
Time : Three Hours] [Maximum Marks : 60
Note :— (1) Question No. 1 is compulsory. Solve it in ONE attempt only.
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(2) Attempt ONE question from each unit.
Choose the correct alternative :
- The roots of the equation (D2 — 4D + 13)y = 0 are :
- distinct and real
- real and equal
- complex and repeated
- None of these
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- A linear equation of first order is of the form Y' + PY = Q in which ?
- P is function of Y
- P and Q are function of X
- P is function of X and Q is function of Y
- None of these
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- The condition for the partial differential equation f(x, y, z, p, Q) = 0 and g(x, y, z, p, Q) =0 to be compatible is that :
- None of these
- The D.E. is called :
- Partial differential equation
- Ordinary differential equation
- Total differential equation
- Linear differential equation
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- An equation of the form Pp + Qq = R where P, Q, R are the functions of X, Y, Z is called :
- Lagrange’s equation
- Jacobi’s equation
- Charpit’s equation
- Clairaut’s equation
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- The particular solution of DE W" + PW' + QW = 0 is y = ex iff :
- P+Q=0
- 1+P+Q=0
- 1-P+Q=0
- 1+P+Q=0
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- The solution of PDE (D — mD')z = 0 is :
- z=F(y + mx)
- z=F(y - mx)
- None of these
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- of PDE is :
- F(x,y,z, p) =0
- F(x,y,z,q) =0
- F(x,y,z,p,q) =0
- F(y,z,p,q) =0
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- The complete integral of F(x, p) = G(y. q) is :
- z= ∫ h(x, a)dx
- ∫ k(y, a)dy
- z= ∫ h(x, a)dx + ∫ k(y, a)dy +b
- None of these
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- The DE Mdx + Ndy = 0 is exact iff
UNIT—I
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- (a) Show that the D.E. : (sin x sin y — x ey)dy = (ey + cos x - cos y)dx is exact and hence solve it.
(b) Find the orthogonal trajectory of rn = an cos nθ. - (p) Solve the D.E. : (1 + x3)dy + 2xy dx = cot x dx.
(q) Solve
UNIT—II
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- (a) Solve the D.E. (D2 - 4)y = ex
(b) Solve the D.E. (x2D2 - 3xD - 3)y = x2 sin(log x). - (p) Solve the D.E. (x2D2 — xD + 4)y = cos(log x).
(q) Solve the D.E.
UNIT—III
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- (a) Solve the system of D.E : D2x — 2y = 0 and D2y + 2x = 0.
(b) Solve the D.E. by variation of parameter. - (p) Solve x2y" + xy' + y = sin(log x) by changing the independent variable X to z = log x.
(q) Solve the following D.E. by removing the first derivative :
UNIT—IV
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- (a) Solve :
(b) Find the complete integral of z = p2x + q. - (p) Find the general solution of PDE x2p + y2q = (x + y)z.
(q) Solve the PDE p2 + q2 = k2
UNIT—V
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- (a) Solve the D.E. (D2 + 3DD' + 2D'2)z = x +y.
(b) Solve by Charpits method pxy + pq + qy = yz. - (p) The PDE z = px + qy is compatible with any equation f(x, y, z, p, q) = 0 where f is homogeneous in x, y, z. Prove this.
(q) Find a real function v of x and y, reducing to zero when y = 0 and satisfying
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This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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