1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What is the relation obeyed by the angles of contact $$\theta_1, \theta_2$$ and $$\theta_3$$ of 3 liquids of different densities $$P_1, P_2$$ and $$P_3$$ respectively $$(\mathrm{P}_1 < \mathrm{P}_2 < \mathrm{P}_3$$) when they rise to the same capillary height in 3 identical capillaries and having nearly same surface tension $$\mathrm{T}$$ ?

A
$$ 0 \leq \theta_3<\theta_2<\theta_1<\frac{\pi}{2} $$
B
$$ \frac{\pi}{2}>\theta_1>\theta_2>\theta_3 \geq 0 $$
C
$$ \pi>\theta_1>\theta_2>\theta_3 \geq \frac{\pi}{2} $$
D
$$ 0 \leq \theta_1<\theta_2<\theta_3<\frac{\pi}{2} $$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

64 rain drops of the same radius are falling through air with a steady velocity of $$0.5 \mathrm{~cm} \mathrm{~s}^{-1}$$. If the drops coalesce, the terminal velocity would be

A
$$1.25 \mathrm{~cm} \mathrm{~s}^{-1}$$
B
$$0.08 \mathrm{~ms}^{-1}$$
C
$$0.8 \mathrm{~ms}^{-1}$$
D
$$1.25 \mathrm{~ms}^{-1}$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A block of wood floats in water with $$(4 / 5)$$ th of its volume submerged. If the same block just floats in a liquid, the density of the liquid is (in $$\mathrm{kgm}^{-3}$$)

A
1250
B
600
C
400
D
800
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A balloon with mass $m$ is descending down with an acceleration $$a$$ (where, $$a < g$$ ). How much mass should be removed from it so that it starts moving up with an acceleration $$a$$ ?

A
$$\frac{2 m a}{g+a}$$
B
$$\frac{2 m a}{g-a}$$
C
$$\frac{m a}{g+a}$$
D
$$\frac{m a}{g-a}$$
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