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

Suppose 'a' and 'b' are non-zero constants satisfying the following system of equations $\boldsymbol{a} \sin ^3 x+\boldsymbol{b} \cos ^3 x=\sin x \cos x$ and $\mathbf{a} \sin x-\boldsymbol{b} \cos x=0$, then $\mathbf{2}\left(\boldsymbol{a}^6+\boldsymbol{b}^6\right)-\mathbf{3}\left(\boldsymbol{a}^4+\boldsymbol{b}^4\right)+\mathbf{1}=$

A

1

B

-1

C

0

D

$2 \sin ^2 x$

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

The variance of a set of 20 observations is 16 . If 7 is added to each observation, and then $\mathbf{5}$ is subtracted from each resulting observation, what will be the new standard deviation?

A

4

B

9

C

18

D

2

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

$$ \text { If }(\vec{a}+\vec{b}) \perp \vec{b} \text { and }(\vec{a}+2 \vec{b}) \perp \vec{a} \text {, then } $$

A

$$ 2|\vec{a}|=|\vec{b}| $$

B

$$ |\vec{a}|=2|\vec{b}| $$

C

$$ |\vec{a}|=|\vec{b}| $$

D

$$ |\vec{a}|=\sqrt{2}|\vec{b}| $$

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

Let the population of a species of birds surviving at a time ' $\boldsymbol{t}$ ' be governed by the differential equation $\frac{d p}{d t}-p=-100$. If $p(0)=50$, then $p\left(-\log _e 2\right)$ is equal to

A

100

B

90

C

75

D

40