Properties of Fluids MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Properties of Fluids, a fundamental topic in the field of Fluid Mechanics. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Properties of Fluids MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Properties of Fluids mcq questions that explore various aspects of Properties of Fluids problems. Each MCQ is crafted to challenge your understanding of Properties of Fluids principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Fluid Mechanics tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Properties of Fluids MCQs are your pathway to success in mastering this essential Fluid Mechanics topic.

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Properties of Fluids MCQs | Page 5 of 12

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Q41.
The kinematic viscosity of a fluid is 0.1 Stokes. What will be the value is m²/s?

a.

10⁻²

b.

10⁻³

c.

10⁻⁴

d.

10⁻⁵

Discuss
Answer: (d).10⁻⁵
Q42.
The shear stress at a point in a liquid is found to be 0.03 N/m². The velocity gradient at the point is 0.15 s⁻¹. What will be it’s viscosity (in Poise)?

a.

20

b.

2

c.

0.2

d.

0.5

Discuss
Answer: (b).2
Q43.
Two horizontal plates placed 250mm have an oil of viscosity 20 poises. Calculate the shear stress in oil if upper plate is moved with velocity of 1250mm/s.

a.

20 N/m²

b.

2 N/m²

c.

10 N/m²

d.

None of the mentioned

Discuss
Answer: (c).10 N/m²
Q44.
The kinematic viscosity of oil of specific gravity .8 is .0005 .This oil is used for lubrication of shaft of diameter .4 m and rotates at 190 rpm. Calculate the power lost in the bearing for a sleeve length of 90mm. The thickness of the oil film is 1.5mm.

a.

477.65 Watts

b.

955.31 Watts

c.

238.83 Watts

d.

None of the mentioned

Discuss
Answer: (a).477.65 Watts
Q45.
Find the kinematic viscosity of oil having density 1962 g/m³. The force experienced for area of 20 m² is 4.904 kN and velocity of gradient at that point is 0.2/s.

a.

0.625

b.

1.25

c.

2.5

d.

None of the mentioned

Discuss
Answer: (a).0.625
Q46.
The velocity distribution for fluid flow over a flat plate is given by u=2y-6y² in which u is the velocity in metre per second at a distance of y metre above the plate. Determine the shear stress at y=0.15m.Take dynamic viscosity of fluid as 8.6 poise.

a.

0.172 N/m²

b.

0.344 N/m²

c.

0.086 N/m²

d.

None of the mentioned

Discuss
Answer: (a).0.172 N/m²
Q47.
In which types of fluids it is observed that momentum transfer dominates cohesive forces with increase in temperature and hence viscosity increases.

a.

Gases

b.

Liquids

c.

Solids

d.

None of the mentioned

Discuss
Answer: (a).Gases
Q48.
What is the characteristic variation shown by the thixotropic fluids in their shear stress vs. rate of shear strain graph?

a.

shear stress increases with increase in rate of shear strain

b.

shear stress decreases with increase in rate of shear strain

c.

shear stress shows variation only after a definite shear stress is reached

d.

shear stress has decreasing constant and then variation relationship with rate of shear strain

Discuss
Answer: (c).shear stress shows variation only after a definite shear stress is reached
Q49.
What happens to viscosity in the case of incompressible fluids as temperature is increased?

a.

It remains constant

b.

It increases

c.

It decreases

d.

None of the mentioned

Discuss
Answer: (c).It decreases
Q50.
If a fluid, which has a constant specific gravity, is taken to a planet where acceleration due to gravity is 3 times compared to its value on earth, what will happen to its kinematic viscosity.

a.

It increases

b.

It decreases

c.

It remains constant

d.

None of the above

Discuss
Answer: (c).It remains constant
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