Question

Fill in the blanks using the word(s) from the list appended with each statement:

(a) Surface tension of liquids generally . . . with temperatures (increases / decreases)

(b) Viscosity of gases. .. with temperature, whereas viscosity of liquids . . . with temperature (increases / decreases)

(c) For solids with elastic modulus of rigidity, the shearing force is proportional to . . . , while for fluids it is proportional to . .. (shear strain / rate of shear strain)

(d) For a fluid in a steady flow, the increase in flow speed at a constriction follows (conservation of mass / Bernoulli’s principle)

(e) For the model of a plane in a wind tunnel, turbulence occurs at a ... speed for turbulence for an actual plane (greater / smaller)

Answer 1

(a) surface tension of a liquid generally decrease with temperature.

(b) viscosity of gases increases with temperature, whereas viscosity of liquid decreases with temperature.

(c) for solid with elastic modulus of rigidity , the shearing force is proportional to shear strain , while for fluid it is proportional to rate of shear strain.

(d) For a fluid in a steady flow, the increase in flow speed at a construction follows from ' conservation of mass' while the decrease of pressure there follows from ' Bernoulli's principle' .

(e)For the model of a plane in a wind tunnel, turbulence occurs at a greater speed that the critical speed for turbulence for an actual plane .

Answer 2

(a) Decreases

(b) Not the gases increases ; not the liquid decreases

(c) shear strain;   rate of shear strain

(d) conservation of mass;   Bernoullis principle

(e) Greater

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