1
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The surface tension of most of the liquid decreases with rise in

A
viscosity of the liquid
B
diameter of capillary
C
temperature of the liquid
D
density of the liquid
2
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The velocity of a small ball of mass '$$M$$' and density '$$\mathrm{d}_1$$' when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is '$$\mathrm{d}_2$$', the viscous force acting on the ball is ( $$\mathrm{g}=$$ acceleration due to gravity)

A
$$\mathrm{Mg} \frac{\mathrm{d}_1}{\mathrm{~d}_2}$$
B
$$\mathrm{Mgd}_1 \mathrm{~d}_2$$
C
$$\operatorname{Mg}\left(d_1-d_2\right)$$
D
$$\operatorname{Mg}\left(1-\frac{\mathrm{d}_2}{\mathrm{~d}_1}\right)$$
3
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two small drops of mercury each of radius '$$R$$' coalesce to form a large single drop. The ratio of the total surface energies before and after the change is

A
$$\sqrt{2}: 1$$
B
$$2^{2 / 3}: 1$$
C
$$2^{1 / 3}: 1$$
D
$$2: 1$$
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

What should be the radius of water drop so that excess pressure inside it is 72 Nm$$^{-2}$$ ? (The surface tension of water 7.2 $$\times$$ 10$$^{-2}$$ Nm$$^{-1}$$)

A
1 mm
B
2 mm
C
8 mm
D
4 mm
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