# NCERT Class 12-Math's: Chapter –9 Differential Equations Part 13

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**Question 39:**

Solution of differential equation represents:

(A) A rectangular hyperbola

(B) Parabola whose vertex is at origin

(C) Straight line passing through origin

(D) A circle whose centre is at origin

**Answer: (C)**

**Question 40:**

Integrating factor of the differential equation is:

(A)

(B)

(C)

(D)

**Answer: (C)**

**Question 41:**

Solution of the differential equation is:

(A)

(B)

(C)

(D)

**Answer: (D)**

**Question 42:**

Family of curves is represented by the differential equation of degree:

(A)

(B)

(C)

(D)

**Answer: (A)**

**Question 43:**

Integrating factor of is

(A)

(B)

(C)

(D)

**Answer: (C)**

**Question 44:**

Solution of is given by

(A)

(B)

(C)

(D)

**Answer: (D)**

**Question 45:**

The number of solutions of when is:

(A) None

(B) One

(C) Two

(D) Infinite

**Answer: (B)**

**Question 46:**

Which of the following is a second order differential equation?

(A)

(B)

(C)

(D)

**Answer: (B)**

**Question 47:**

Integrating factor of the differential equation is

(A)

(B)

(C)

(D)

**Answer: (C)**

**Question 48:**

is the general solution of the differential equation:

(A)

(B)

(C)

(D)

**Answer: (C)**