Viscosity MCQ

1. Which of the following represents viscosity?

• Potential energy stored in fluid
• Resistance to fluid motion
• Roughness of the surface
• The pressure difference between the two fluids

2. Newton's law of viscosity states that

• the shear stress applied to the fluid is directly proportional to the velocity gradient (du/dy)
• the shear stress applied to the fluid is inversely proportional to the velocity gradient (du/dy)
• the shear stress applied to the fluid is directly proportional to the specific weight of the fluid
• the shear stress applied to the fluid is inversely proportional to the specific weight of the fluid

3. Which one of the following shows the correct order (left to right) of decreasing magma viscosity?

• Rhyolite, andesite, basalt
• Andesite, rhyolite, basalt
• Basalt, rhyolite, andesite
• Basalt, andesite, rhyolite

4. Which magma type would generally have the lowest viscosity?

• basalt
• andesite
• dacite
• rhyolite

5. Which of the following lists magma types in order of increasing viscosity (least viscous first)?

• Basaltic
• andesitic
• rhyolitic
• All of above

6. Which of the following oils has the highest viscosity

• SAE 20
• SAE 10
• SAE 50
• SAE 45

7. Viscosity index is a measure for the change of viscosity with change in

8. The viscosity of a fluid in motion is 1 poise

• 0
• 0.5
• 1
• 2

9. A fluid having no viscosity is known as

• Real fluid
• Ideal fluid
• Newtonian fluid
• Non-Newtonian fluid

10. The coefficient of viscosity may be determined by

• Capillary tube method
• Orifice type viscometer
• Rotating cylinder method
• All of above

11. What is flow rate?

• The speed of a fish swimming across a lake.
• The speed of a rocket going to the moon.
• The speed which a fluid flows from one point to another.
• None of these

12. What is fluid flow?

• Describes how fluids behave when frozen.
• Describes how fluids behave when heated.
• Describes how fluids behave in their surrounding environment.