MHT CET 2023 10th May Morning Shift | Fluid Mechanics Question 30 | Physics

The height of liquid column raised in a capillary tube of certain radius when dipped in liquid '$$A$$' vertically is $$5 \mathrm{~cm}$$. If the tube is dipped in a similar manner in another liquid '$$B$$' of surface tension and density double the values of liquid '$$A$$', the height of liquid column raised in liquid '$$B$$' would be (Assume angle of contact same)

0.20 m

0.5 m

0.05 m

0.10 m

MHT CET 2023 9th May Evening Shift

MCQ (Single Correct Answer)

-0

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

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

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

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

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

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