1
MHT CET 2021 20th September Evening Shift
+1
-0

The surface energy of a liquid drop is 'U'. It splits up into 512 equal droplets. The surface energy becomes

A
8 U
B
6 U
C
4 U
D
2 U
2
MHT CET 2021 20th September Morning Shift
+1
-0

Air is pushed in a soap bubble to increase its radius from 'R' to '2R'. In this case, the pressure inside the bubble

A
does not change
B
decrease
C
becomes zero
D
increases
3
MHT CET 2021 20th September Morning Shift
+1
-0

Let '$$\mathrm{R_1}$$' and '$$\mathrm{R_2}$$' are radii of two mercury drops. A big mercury drop is formed from them under isothermal conditions. The radius of the resultant drop is

A
$$\sqrt{\mathrm{R}_1^2+\mathrm{R}_2^2}$$
B
$$\left(\mathrm{R}_1^3+\mathrm{R}_2^3\right)^{\frac{1}{3}}$$
C
$$\sqrt{\mathrm{R}_1^2-\mathrm{R}_2^2}$$
D
$$\frac{\mathrm{R}_1+\mathrm{R}_2}{2}$$
4
MHT CET 2021 20th September Morning Shift
+1
-0

The force required to take away a flat circular plate of radius $$2 \mathrm{~cm}$$ from the surface of water is $$\left[\right.$$Surface tension of water $$\left.=70 \times 10^{-3} \mathrm{Nm}^{-1}, \pi=\frac{22}{7}\right]$$

A
$$4.4 \times 10^{-4} \mathrm{~N}$$
B
$$8.8 \times 10^{-3} \mathrm{~N}$$
C
$$6.6 \times 10^{-4} \mathrm{~N}$$
D
$$11 \times 10^{-3} \mathrm{~N}$$
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