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

Water flows from a tap with steady flow, through a cross sectional area of $$10^{-3} \mathrm{~m}^2$$ with a speed of $$0.5 \mathrm{~ms}^{-1}$$. Assume the pressure is constant throughout the stream of water. The cross sectional area of the stream $$0.19 \mathrm{~m}$$ below the tap is

A
$$ 1 \times 10^{-3} \mathrm{~m}^2 $$
B
$$ 1 \times 10^{-4} \mathrm{~m}^2 $$
C
$$ 2.5 \times 10^{-4} \mathrm{~m}^2 $$
D
$$ 5 \times 10^{-5} \mathrm{~m}^2 $$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Modulus of rigidity of an incompressible liquid is

A
Zero
B
Infinite
C
Cannot predict
D
Non zero constant
4
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
$$1.25 \mathrm{~ms}^{-1}$$
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