NCERT solution Class 11 mechanical properties of fluids

NCERT Solutions

Class 11 Physics

Mechanical Properties of Fluids

NCERT Questions

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Q.9.3

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)

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

Explanation: - The surface tension is inversely proportional to temperature.

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

Explanation: - The resistance offered by fluids to their motion is known as viscosity. Viscosity of gases increases with temperature, while viscosity of liquids decreases with temperature.

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

Explanation: - The elastic modulus of rigidity of solids, the shearing force is proportional to the shear strain. And the elastic modulus of rigidity of fluids, the shearing force is proportional to the 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’.

Explanation: - For a fluid in a steady flow, the increase in flow speed at a constriction 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 for turbulence for an actual plane.

Explanation: - For the model of a plane in a wind tunnel, turbulence occurs at a greater speed then it does for an actual plane. This follows from Bernoulli’s principle and different Reynolds’ numbers are associated with the motions of the two planes.

Video solution:

Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 NCERT Solutions

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NCERT solutions of Mechanical Properties of Fluids Class 11 Physics - all questions of all exercises are solved. Q. No. 1, 2, 3, and so on. Complete explanation and detailed solution makes them the best videos for Class 11 Physics Mechanical Properties of Fluids NCERT solutions.