# Class 12 Math Chapter 9 MCQ Question Answer – Differential Equation NCERT Solution

NCERT Class 12 Math Differential Equation Chapter 9 MCQ Question Answer for Preparation of Exams. Here we Provide Class 12 Math Question Answer, Important Questions, MCQ for Various State Boards Students like CBSE, Haryana, uttar pradesh, mp and other state students.

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NCERT Class 12 Math Chapter 9 Differential Equation MCQ Question Answer Solution.

## Differential Equation Class 12 Math Chapter 9 MCQ Question Answer

Multiple Choice Questions and Answer for Easy to Understand the Chapter.

1. Which of the following differential equation has  y = c1ex + c2e-x as the general solution ?
(A) (d2y/dx2)+y = 0
(B) (d2y/dx2) – y = 0
(C)(d2y/dx2) + 1 = 0
(D) (d2y/dx2) – 1 = 0

Answer

Ans. (B) (d2y/dx2) – y = 0

2. Which of the following differential equations has y = x as one of its particular solution?
(A) (d2y/dx2) – x2(dy/dx) + xy = x
(B) (d2y/dx2) + x(dy/dx) + xy = x
(C) (d2y/dx2) – x2(dy/dx) + xy = 0
(D) (d2y/dx2) + x2(dy/dx) + xy = 0

Answer

Ans. (C) (d2y/dx2) – x2(dy/dx) + xy = 0

3. The general solution of the differential equation (dy/dx) = ex+y is
(A) ex +e-y = C
(B) ex +ey = C
(C) ex +ey = C
(D) ex +e-y = C

Answer

Ans. (A) ex +e-y = C

4. A homogenous differential equation of the from (dx/dy) = h(x/y) can be solved by making the substitution.
(A) y = vx
(B) v = yx
(C) x = vy
(D) x  = v

Answer

Ans. (C) x = vy

5. Which of the following is a homogeneous differential equation ?
(A) (4x + 6y + 5)dy – (3y + 2x + 4)dx = 0
(B) (xy)dx – (x3 + y3)dy = 0
(C) (x+ 2y2)dx + 2xydy = 0
(D) y2dx + (x2 -xy -y2)dy = 0

Answer

Ans. (D) y2dx + (x2 -xy -y2)dy = 0

6. The integrating factor of the differential  equation x(dy/dx) – y = 2xis
(A) e
(B) e-y
(C) 1/x
(D) x

Answer

Ans. (C) 1/x

7. The Integrating factor of the differential equation (1 – y2)dx/dy + yx = ay where (-1<y<1) is
(A) 1/(y2 – 1)
(B) 1/√(y2 – 1)
(C) 1/(1 – y2)
(D) 1/√(1 – y2)

Answer

Ans. (D) 1/√(1 – y2)

8. The number of arbitrary constants in the general solution of a differential equation of fourth order are:
(A) 0
(B) 2
(C) 3
(D) 4

Answer

Ans. (D) 4

9. The number of arbitrary in the particular solution of a differential equation of third order are:
(A) 3
(B) 2
(C) 1
(D) 0

Answer

Ans. (D) 0

10. The degree of the differential equation (d2y/dx2)3 + (dy/dx)2 + sin(dy/dx) + 1 = 0
(A) 3
(B) 2
(C) 1
(D) not defined

Answer

Ans. (D) not defined

11. The order of the differential equation 2x2(d2y/dx2) – 3(dy/dx) + y = 0
(A) 2
(B) 1
(C) 0
(D) not defined

Answer

Ans. (A) 2

12. The general solution of the differential equation exdy + (yex + 2x)dx = 0 is
(A) xey + x2 = C
(B) xey + y= C
(C) yex + x2 = C
(D) yey + x2 = C

Answer

Ans. (C) yex + x2 = C

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