KMK20103 Quiz 1: Introductory Concept of Fluid Mechanics

Which of the following does NOT describe 'fluid'?

• A liquid, gas, or other material that continually deforms under an applied external force

• A substance that is capable of flowing and changes its shape at a steady rate when acted upon by a force

• A substance that flows and is solid

• A substance that can flow, has no fixed shape and offers little resistance to external stress

What is Fluid Mechanics?

• The study of the behavior of fluid, either at rest (statics) or in motion (dynamics).

• The study of the reaction of fluid, either at rest (statics) or in motion (dynamics).

• The study of the response of fluid, either at rest (statics) or in motion (dynamics).

• The study of the behavior of fluid, either at rest (dynamics) or in motion (statics).

Which of the following incorrectly describes a "liquid"?

• The fluid surface (free surface) can be easily identified

• Will not expand continuously until it fills the entire available space

• Usually has low compressibility

• Usually has low numerical values in Bulk Modulus of Elasticity

Which of the following incorrectly describes a "gas"?

• The fluid surface (free surface) cannot be easily identified

• Will expand continuously until it fills the entire available space

• Usually has high compressibility

• Usually has high numerical values in Bulk Modulus of Elasticity

Which of the following is NOT a unit of "Pressure"?

• Pascal (Pa)

• Pound

• Pound per square inch (psi)

• Bar

Which of the following correctly describes the difference between mass and weight?

• Mass can be zero, but weight cannot be zero.

• Mass will change with the corresponding location, but weight won't.

• Mass is measured using a balance, while weight is measured using a spring balance.

• The mass of an object is not constant due to its location.

Which of the following correctly describes Specific Gravity?

• The ratio of the density of a substance to the density of water at 4 ˚C

• The ratio of the mass of a substance to the mass of water at 4 ˚C

• The ratio of the volume of a substance to the volume of water at 4 ˚C

• The ratio of the specific weight of a substance to the specific weight of water at 4 ˚C

Which of the following correctly describes Specific Weight?

• The amount of mass per unit volume of a substance

• The amount of weight per unit volume of a substance

• The amount of density per unit volume of a substance

• The amount of weight per unit area of a substance

Which of the following correctly describes Newton's Law of Viscosity?

• The resistance, which arises from the lack of slipperiness of the parts of the liquid and is directly proportional to the velocity with which the parts of the liquid are separated from one another, other things being equal.

• The resistance, which arises from the lack of slipperiness of the parts of the liquid and is inversely proportional to the velocity with which the parts of the liquid are separated from one another, other things being equal.

• The resistance, which arises from the lack of slipperiness of the parts of the liquid, has no relationship with the velocity with which the parts of the liquid are separated from one another.

• The resistance, which arises from the high slipperiness of the parts of the liquid and is proportional to the velocity with which the parts of the liquid are separated from one another, other things being equal.

Does the dynamic viscosity change with shear stress, relative position and/or velocity change?

• Yes

• No

• Yes and No

• Please help me