MHT CET 2023 9th May Evening Shift | Fluid Mechanics Question 78 | Physics

A film of soap solution is formed between two straight parallel wires of length $$10 \mathrm{~cm}$$ each separated by $$0.5 \mathrm{~cm}$$. If their separation is increased by $$1 \mathrm{~mm}$$ while still maintaining their parallelism. How much work will have to be done?

(surface tension of solution $$=65 \times 10^{-2} \mathrm{~N} / \mathrm{m}$$ )

$$7.22 \times 10^{-6} \mathrm{~J}$$

$$13.0 \times 10^{-5} \mathrm{~J}$$

$$2.88 \times 10^{-5} \mathrm{~J}$$

$$5.76 \times 10^{-5} \mathrm{~J}$$

MHT CET 2023 9th May Evening Shift

MCQ (Single Correct Answer)

-0

A soap bubble of radius '$$R$$' is blown. After heating a solution, a second bubble of radius '$$2 \mathrm{R}$$' is blown. The work required to blow the $$2^{\text {nd }}$$ bubble in comparison to that required for the $$1^{\text {st }}$$ bubble is

exactly double.

slightly more than 4 times.

slightly less than 4 times.

slightly less than double.

MHT CET 2023 9th May Evening Shift

MCQ (Single Correct Answer)

-0

A fluid of density '$$\rho$$' and viscosity '$$\eta$$' is flowing through a pipe of diameter '$$d$$', with a velocity '$$v$$'. Reynold number is

$$\frac{2 \mathrm{~d} \rho \mathrm{v}}{\eta}$$

$$\frac{\mathrm{d} \rho \mathrm{v}}{\eta}$$

$$\frac{\mathrm{d} \rho v}{\eta^2}$$

$$\frac{2 \eta \mathrm{dv}}{\rho}$$

MHT CET 2023 9th May Morning Shift

MCQ (Single Correct Answer)

-0

Water is flowing through a horizontal pipe in stream line flow. At the narrowest part of the pipe

velocity is maximum and pressure minimum.

pressure is maximum and velocity minimum.

both pressure and velocity are minimum.

both pressure and velocity are maximum.

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