1
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
$$1.25 \mathrm{~ms}^{-1}$$
2
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
3
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
$$\frac{m a}{g-a}$$
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The speeds of air-flow on the upper and lower surfaces of a wing of an aeroplane are $$v_1$$ and $$v_2$$, respectively. If $$A$$ is the cross-sectional area of the wing and $$\rho$$ is the density of air, then the upward lift is

A
$$\frac{1}{2} \rho A\left(v_1-v_2\right)$$
B
$$\frac{1}{2} \rho A\left(v_1+v_2\right)$$
C
$$\frac{1}{2} \rho A\left(v_1^2-v_2^2\right)$$
D
$$\frac{1}{2} \rho A\left(v_1^2+v_2^2\right)$$
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