# NCERT Class 12-Math՚s: Chapter – 9 Differential Equations Part 13 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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)**