1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $\mathbf{3 ~ c m} / \mathbf{s}$ is the rate at which the side of an equilateral triangle increases, then the rate of change of area, when the side is $\mathbf{1 2 ~ c m}$ is:

A

$9 \sqrt{3} \mathrm{~cm}^2 / \mathrm{s}$

B

$18 \mathrm{~cm}^2 / \mathrm{s}$

C

$6 \sqrt{3} \mathrm{~cm}^2 / \mathrm{s}$

D

$18 \sqrt{3} \mathrm{~cm}^2 / \mathrm{s}$

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $\sin A+\sin 2 A=x$ and $\cos A+\cos 2 A=y$ then the value of the expression $\left(x^2+y^2\right)\left(x^2+y^2-3\right)$ equals

A

0

B

$3 y$

C

$\frac{y}{2}$

D

$2 y$

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Given the matrices $A=\left[\begin{array}{lll}1 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 2\end{array}\right]$ and $B=\left[\begin{array}{lll}2 & 1 & 0 \\ 1 & 1 & 2 \\ 0 & 2 & 1\end{array}\right]$, then the minor $\boldsymbol{M}_{\mathbf{2 3}}$ of the matrix $\left(A B^{-1}\right)^{-1}$ is:

A

2

B

9

C

4

D

-9

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The order and degree of the differential equation $\left(\frac{d y}{d x}\right)^2+\frac{d x}{d y}=x$ is:

A

$(1,1)$

B

$(1,2)$

C

$(2,1)$

D

$(1,3)$