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Mechanical Engineering Exam  >  Mechanical Engineering Test  >  Fluid Mechanics  >  Test: Viscosity - 2 - Mechanical Engineering MCQ

Viscosity - 2 - GATE ME Fluid Mechanics Free MCQ Test with solutions


MCQ Practice Test & Solutions: Test: Viscosity - 2 (10 Questions)

You can prepare effectively for Mechanical Engineering Fluid Mechanics for Mechanical Engineering with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Viscosity - 2". These 10 questions have been designed by the experts with the latest curriculum of Mechanical Engineering 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 10

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Test: Viscosity - 2 - Question 1
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Two horizontal plates placed 250mm apart have an oil of viscosity 20 poises. Calculate the shear stress in oil if upper plate is moved with velocity of 1250mm/s.

Detailed Solution: Question 1

Explanation: Shear Stress = Viscosity * Velocity Gradient
= 20/10* 1.25/0.25
= 10 N/m2.

Test: Viscosity - 2 - Question 2
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The kinematic viscosity of oil of specific gravity .8 is .0005. This oil is used for lubrication of shafts diameter of .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.

Detailed Solution: Question 2

Explanation: Power lost= torque * angular velocity
= force x radius x angular velocity
= shear stress x area x radius x angular velocity
Shear Stress = viscosity x velocity gradient
Power lost= 0.0005 x 0.8 x 1000 x 2 x 3.142 x 190/60 x 0.2 x 3.142 x 0.23 x 190/60
= 477.65 Watts.

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Test: Viscosity - 2 - Question 3
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Find the kinematic viscosity of oil having density 1962 kg/m3. The force experienced for area of 20 m2 is 4.904 kN and velocity of gradient at that point is 0.2/s.

Detailed Solution: Question 3

Explanation: kinematic viscosity = dynamic viscosity / density
= (shear stress*density)/velocity gradient
= (4904* 1962)/(20*0.2)
= 0.625.

Test: Viscosity - 2 - Question 4
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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.

Detailed Solution: Question 4

Explanation: for y = 0.15m, velocity gradient = 0.2
viscosity= shear stress/velocity gradient
shear stress = 0.86*0.2 = 0.172N/m2

Test: Viscosity - 2 - Question 5
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In which types of fluids it is observed that momentum transfer dominates cohesive forces with increase in temperature and hence viscosity increases

Detailed Solution: Question 5

Explanation: It is the characteristic property of gases which show increase in viscosity with increase in temperature.

Test: Viscosity - 2 - Question 6
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What is the characteristic variation shown by the thixotropic fluids in their shear stress vs. rate of shear strain graph?

Detailed Solution: Question 6

Explanation: Thixotropic fluid show a Non-Newtonian variation for shear stress vs. rate of shear strain graph after a characteristic limiting value of shear stress is reached.

Test: Viscosity - 2 - Question 7
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What happens to viscosity in the case of incompressible fluids as temperature is increased?

Detailed Solution: Question 7

Explanation: In case of incompressible fluids, cohesive forces govern the viscosity. As temperature increases the cohesive forces between fluid molecules decreases due to increase in molecular agitation. Hence, as a result, viscosity decreases.

Test: Viscosity - 2 - Question 8
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 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.

Detailed Solution: Question 8

Explanation: Kinematic viscosity depends on density and dynamic viscosity. Both, density and dynamic viscosity, are independent of acceleration due to gravity. Therefore, kinematic viscosity is independent of acceleration due to gravity.

Test: Viscosity - 2 - Question 9
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In liquids in order to measure the viscosity of fluid experimentally we consider the variation of shear stress with respect to what property?

Detailed Solution: Question 9

Explanation: By definition, viscosity is shear stress per unit ‘rate of shear strain’.

Test: Viscosity - 2 - Question 10
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For a compressible fluid the kinematic viscosity is affected by temperature and pressure variation.

Detailed Solution: Question 10

Explanation: Viscosity shows variation for change in temperature and pressure for compressible fluids. Hence, kinematic viscosity is affected by temperature and pressure variation.

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About this Mechanical Engineering Practice Test

This test contains 10 MCQs on Viscosity - 2 with detailed solutions for each question. It is part of the Fluid Mechanics for Mechanical Engineering course on EduRev, designed to align with the current Mechanical Engineering syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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