1
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The work done in blowing a soap bubble of radius $$\mathrm{R}$$ is '$$\mathrm{W}_1$$' at room temperature. Now the soap solution is heated. From the heated solution another soap bubble of radius $$2 \mathrm{R}$$ is blown and the work done is '$$\mathrm{W}_2$$'. Then

A
$$\mathrm{W}_2=\mathrm{W}_1$$
B
$$\mathrm{W}_2=4 \mathrm{~W}_1$$
C
$$\mathrm{W}_2<4 \mathrm{~W}_1$$
D
$$\mathrm{W}_2=0$$
2
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A steel coin of thickness '$$\mathrm{d}$$' and density '$$\rho$$' is floating on water of surface tension '$$T$$'. The radius of the coin $$(R)$$ is [$$\mathrm{g}=$$ acceleration due to gravity]

A
$$\frac{\mathrm{T}}{\rho \mathrm{gd}}$$
B
$$\frac{4 \mathrm{~T}}{3 \rho g \mathrm{~d}}$$
C
$$\frac{3 \mathrm{~T}}{4 \rho \mathrm{gd}}$$
D
$$\frac{2 \mathrm{~T}}{\rho \mathrm{gd}}$$
3
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The excess pressure inside a soap bubble of radius $$2 \mathrm{~cm}$$ is 50 dyne/cm$$^2$$. The surface tension is

A
50 dyne/cm
B
60 dyne/cm
C
75 dyne/cm
D
25 dyne/cm
4
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

'n' small drops of same size fall through air with constant velocity $$5 \mathrm{~cm} / \mathrm{s}$$. They coalesce to form a big drop. The terminal velocity of the big drop is

A
$$7 \mathrm{n}^{2 / 3} \mathrm{~cm} / \mathrm{s}$$
B
$$5 \mathrm{n}^{2 / 3} \mathrm{~cm} / \mathrm{s}$$
C
$$3 \mathrm{n}^{2 / 3} \mathrm{~cm} / \mathrm{s}$$
D
$$9 \mathrm{n}^{2 / 3} \mathrm{~cm} / \mathrm{s}$$
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