1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Oil from a conical funnel is dripping at the rate of $5 \mathrm{~cm}^3 / \mathrm{s}$. If the radius and height of the funnel are 10 cm and 20 cm respectively, then the rate at which the oil level drops when it is 5 cm from the top is
A
$\frac{8}{45 \pi} \mathrm{~cm} / \mathrm{s}$
B
$-\frac{2 \pi}{45} \mathrm{~cm} / \mathrm{s}$
C
$-\frac{4 \pi}{45} \mathrm{~cm} / \mathrm{s}$
D
$-\frac{4}{45 \pi} \mathrm{~cm} / \mathrm{s}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A solid S is made from a cylinder surmounted by a hemisphere on top with both its circular faces sharing a common centre. The radius of cylinder and radius of hemisphere are $x \mathrm{~cm}$. The height of the cylinder is $(20-4 x) \mathrm{cm}$ and the volume of S is $V=\frac{1}{3} \pi y$. Find the maximum value of $y$.
A
480
B
360
C
320
D
160
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { The rate of change of the volume of a sphere with respect to its surface area } \mathrm{S} \text { is } $$

A
$$ \frac{1}{2} \sqrt{\frac{S}{\pi}} $$
B
$$ \sqrt{\frac{S}{\pi}} $$
C
$$ \frac{2}{3} \sqrt{\frac{S}{\pi}} $$
D
$$ \frac{1}{4} \sqrt{\frac{S}{\pi}} $$
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The turning point of the function $$y=\frac{a x-b}{(x-1)(x-4)}$$ at the point $$P(2,-1)$$ is

A
neither a maximum nor a minimum
B
both maximum and a minimum
C
a minimum
D
a maximum
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