Grade 8 Fluids Quiz

1. Bouyant force is the upward force exerted on an object submerged in floating on a fluid.

True

False

The explanation for the given correct answer is that the buoyant force is indeed the upward force exerted on an object submerged or floating in a fluid. This force is a result of the pressure difference between the top and bottom of the object, with the higher pressure at the bottom pushing the object upwards. This principle is what allows objects to float in water and is a fundamental concept in fluid mechanics. Therefore, the statement is true.

Explanation

The explanation for the given correct answer is that the buoyant force is indeed the upward force exerted on an object submerged or floating in a fluid. This force is a result of the pressure difference between the top and bottom of the object, with the higher pressure at the bottom pushing the object upwards. This principle is what allows objects to float in water and is a fundamental concept in fluid mechanics. Therefore, the statement is true.

2. Viscosity is how fast the fluid will flow. It all depends on the "thickness" or "thinness"

True

False

Viscosity refers to the resistance of a fluid to flow. It is a measure of the fluid's internal friction or "thickness." A fluid with high viscosity will flow slowly, while a fluid with low viscosity will flow quickly. Therefore, the statement that viscosity is how fast the fluid will flow is true.

Explanation

Viscosity refers to the resistance of a fluid to flow. It is a measure of the fluid's internal friction or "thickness." A fluid with high viscosity will flow slowly, while a fluid with low viscosity will flow quickly. Therefore, the statement that viscosity is how fast the fluid will flow is true.

3. Viscosity is measured by the flow rate

True

False

when saying thickness or thinness it also depends on the flow rate. it means how fast a fluid will flow from one point to another.

Explanation

when saying thickness or thinness it also depends on the flow rate. it means how fast a fluid will flow from one point to another.

4. Pneumatic is the study of pressure by transmitting pressure by using gas

True

False

The given statement is true. Pneumatic is indeed the study of pressure by transmitting pressure using gas. Pneumatics is a branch of physics and engineering that deals with the mechanical properties of gases, particularly the behavior of pressurized air. It involves the study, design, and application of systems that use compressed air to transmit and control energy. By using gas as the medium, pneumatic systems can efficiently transmit pressure and power to various mechanical devices.

Explanation

The given statement is true. Pneumatic is indeed the study of pressure by transmitting pressure using gas. Pneumatics is a branch of physics and engineering that deals with the mechanical properties of gases, particularly the behavior of pressurized air. It involves the study, design, and application of systems that use compressed air to transmit and control energy. By using gas as the medium, pneumatic systems can efficiently transmit pressure and power to various mechanical devices.

5. Hydraulic system : the pressure transmitted through __________

Gas

Liquid

Solid

Hydraulic systems operate by transmitting pressure through a fluid medium, usually hydraulic oil or water. This pressure is generated by a pump and transmitted through sealed pipes or hoses to various components, such as cylinders or motors, allowing for the efficient transfer of force and motion in machinery and equipment.

Explanation

Hydraulic systems operate by transmitting pressure through a fluid medium, usually hydraulic oil or water. This pressure is generated by a pump and transmitted through sealed pipes or hoses to various components, such as cylinders or motors, allowing for the efficient transfer of force and motion in machinery and equipment.

6. Fluid is any substance that flows.

True

False

True. A fluid is any substance that flows under applied stress. This includes both liquids and gases, which adapt to the shape of their containers due to their inability to withstand shear stress in a rest state.

Explanation

True. A fluid is any substance that flows under applied stress. This includes both liquids and gases, which adapt to the shape of their containers due to their inability to withstand shear stress in a rest state.

7. Is this ALL right ( if one is incorrect then mark false, but if they are all correct then mark true) solids: tightly packed together : has definite shape and volume liquids: are close together: definite shape but no definite volume and takes shape of the container gases: are very far apart: has definite volume but no definite shape

True

False

solids: are tightly close together and they have definite shape and volume (Ex. sugar cube) sugar: has denfinite volume but no definite shape (Ex. water) gas: has no definite shape nor volume (Ex. oxygen)

Explanation

solids: are tightly close together and they have definite shape and volume (Ex. sugar cube) sugar: has denfinite volume but no definite shape (Ex. water) gas: has no definite shape nor volume (Ex. oxygen)

8. Pascals law states that when pressure is exerted on part of a fluid, the same pressure is tranmitted unchanged to all parts of fluid. not matter what the volume is.

True

False

Pascal's law states that when pressure is exerted on a confined fluid, the pressure is transmitted equally and undiminished in all directions. This means that the pressure applied to one part of the fluid will be transmitted to all other parts of the fluid, regardless of the volume or shape of the fluid. Therefore, the statement that the same pressure is transmitted unchanged to all parts of the fluid, regardless of the volume, is true.

Explanation

Pascal's law states that when pressure is exerted on a confined fluid, the pressure is transmitted equally and undiminished in all directions. This means that the pressure applied to one part of the fluid will be transmitted to all other parts of the fluid, regardless of the volume or shape of the fluid. Therefore, the statement that the same pressure is transmitted unchanged to all parts of the fluid, regardless of the volume, is true.

9. The ______ acting prependicular to a specific surface area.

Pressure

Area

Force

The force acting perpendicular to a specific surface area is known as pressure. Pressure is defined as the force applied per unit area, and it is exerted in a direction perpendicular to the surface. Therefore, the correct answer is force.

Explanation

The force acting perpendicular to a specific surface area is known as pressure. Pressure is defined as the force applied per unit area, and it is exerted in a direction perpendicular to the surface. Therefore, the correct answer is force.

10. _______ is the tendency to float

Buoyancy is the tendency of an object to float in a fluid, either liquid or gas. This phenomenon occurs due to the upward force exerted by the fluid on the object, which is equal to the weight of the fluid displaced by the object. This force counteracts the gravitational force pulling the object downward, allowing it to float or remain suspended in the fluid.

Explanation

Buoyancy is the tendency of an object to float in a fluid, either liquid or gas. This phenomenon occurs due to the upward force exerted by the fluid on the object, which is equal to the weight of the fluid displaced by the object. This force counteracts the gravitational force pulling the object downward, allowing it to float or remain suspended in the fluid.

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11. Did you like this quiz ? ( dont worry if the anwser is wrong, i just want to see what you think)

Yes

It was okay

It got me thinking

No

The given correct answer is "yes." This suggests that the person liked the quiz.

Explanation

The given correct answer is "yes." This suggests that the person liked the quiz.

12. Archimedes' principle : it is a scientific fact that the _________ acting on a submerged object equal the weight of the fluid.

Archimedes' principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object. This means that the upward force exerted on the object by the fluid is equal to the weight of the fluid that would occupy the same volume as the object. Therefore, the correct answer is buoyant force.

Explanation

Archimedes' principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object. This means that the upward force exerted on the object by the fluid is equal to the weight of the fluid that would occupy the same volume as the object. Therefore, the correct answer is buoyant force.

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13. Density is the amount of _____ in a certain volume.

Density is the amount of mass in a certain volume. It is a measure of how much mass is packed into a given space. The more mass there is in a specific volume, the higher the density. Therefore, mass is the correct answer as it directly relates to the concept of density. Matter, substances, and particles are all related to density but do not directly define it.

Explanation

Density is the amount of mass in a certain volume. It is a measure of how much mass is packed into a given space. The more mass there is in a specific volume, the higher the density. Therefore, mass is the correct answer as it directly relates to the concept of density. Matter, substances, and particles are all related to density but do not directly define it.

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