# Which one of the following is true from the given statements? 1. Surface tension of liquids generally increases with temperatures. 2. Viscosity of gases decreases with temperature. 3. For solids with an elastic modulus of rigidity, the shearing force is proportional to the shear strain. 4. For the model of a plane in a wind tunnel, turbulence occurs at a smaller speed than turbulence for an actual plane.

Subtopic:  Properties of Fluids |
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A $$50$$ kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter of $$1.0$$ cm. What is the pressure exerted by the heel on the horizontal floor?
1. $$6.24 \times 10^6 ~\mathrm{Nm}^{-2}$$
2. $$4.21 \times 10^5 ~\mathrm{Nm}^{-2}$$
3. $$20 \times 10^6 ~\mathrm{Nm}^{-2}$$
4. $$1.01 \times 10^5~ \mathrm{Nm}^{-2}$$

Subtopic:  Pressure |
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Toricelli’s barometer used mercury. Pascal duplicated it using French wine of density $$984~\text{kg/m}^3.$$ The height of the wine column for normal atmospheric pressure is:
1. $$11.5~\text{m}$$
2. $$10.5~\text{m}$$
3. $$9.00~\text{m}$$
4. $$15.0~\text{m}$$

Subtopic:  Pressure |
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A hydraulic automobile lift is designed to lift cars with a maximum mass of $$3000$$ kg. The area of the cross-section of the piston carrying the load is $$425$$ cm2. What maximum pressure would the smaller piston have to bear?
1. $$3.12\times10^{5}$$ Pa
2. $$1.01\times10^{5}$$ Pa
3. $$2.94\times10^{5}$$ Pa
4.
$$6.92\times10^{5}$$ Pa

Subtopic:  Pressure |
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A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of the spirit?

1. 0.8
2. 0.3
3. 0.5
4. 0.7

Subtopic:  Pressure |
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Glycerine flows steadily through a horizontal tube of a length of 1.5 m and a radius of 1.0 cm. If the amount of glycerine collected per second at one end is 4.0 × 10–3 kg s–1, what is the pressure difference between the two ends of the tube?
(Density of glycerine = $1.3×{10}^{3}$
kg m–3 and viscosity of glycerine = 0.83 Pa-sec).
1. 7.9 × 10−2 Pa
2. 8.9 × 10−3 Pa
3. 9.8 × 10−2 Pa
4. 6.7 × 10−3 Pa

Subtopic:  Viscosity |
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What is the excess pressure inside a bubble of soap solution of radius $$5.00$$ mm?
(Given that the surface tension of soap solution at the temperature ($$20^{\circ}$$$$\text{C}$$) is $$2.5\times 10^{-2}$$ N/m)
1. $$10$$ Pa
2. $$20$$ Pa
3. $$1.06\times 10^{5}$$ Pa
4. $$15$$ Pa

Subtopic:  Surface Tension |
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A tank with a square base of an area of 1.0 m2 is divided by a vertical partition in the middle. The bottom of the partition has a small-hinged door of area 20 cm2. The tank is filled with water in one compartment, and an acid (of relative density 1.7) in the other, both to a height of 4.0 m. What is the force necessary to keep the door close?

1. 54.88 N
2. 56.0 N
3. 60.0 N
4. 45.5 N

Subtopic:  Pressure |
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During a blood transfusion, the needle is inserted in a vein where the gauge pressure is $$2000$$ Pa. At what height must the blood container be placed so that blood may just enter the vein?
(The density of whole blood is $$1.06\times10^{3}$$ kg/m3).
1. $$0.163$$ m
2. $$0.192$$ m
3. $$0.157$$ m
4. $$0.754$$ m

Subtopic:  Pressure |
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What is the largest average velocity of blood flowing in an artery of radius $$2\times 10^{-3}$$ m if the flow must remain laminar?
(Take the viscosity of blood to be $$2.084\times 10^{-3}$$ Pa-s and density of blood to be $$1.06\times 10^3$$ kg/m3).
1. $$0.459$$ m/s
2. $$0.0987$$ m/s
3. $$0.983$$ m/s
4. $$0.0897$$ m/s

Subtopic:  Types of Flows | Viscosity |
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