Quiz

QUIZ

1. What are the SI units for density?

a. Grams per meter cubed b. Kilograms per meter cubed c. Milliliters d. Grams per milliliter

Answer: b. The actual SI units for density are kilograms per meter cubed. This is relatively impractical so often grams per milliliter or grams per centimeter cubed are often used because water has a density of one gram per cubic centimeter or one gram per milliliter.

2. What is the relationship between density, mass, and volume of a fluid?

a. Density is proportional to the mass and volume. b. Density is inversely proportional to mass and inversely proportional to volume. c. Density is proportional to mass and inversely proportional to volume. d. Density is inversely proportional to mass and proportional to volume.

Answer: c. The density of something is its mass divided by its volume so it is directly proportional to the mass and inversely proportional to its volume.

3. What is the way to measure the pressure using a barometer?

a. Mm water b. Kilopascals c. Atmospheres d. Mm mercury

Answer: d. Both blood pressure and barometric pressure are measured in millimeters of mercury. Barometric pressure equals the atmospheric pressure in the environment; it can also measure the pressure at certain altitudes.

4. According to Archimedes’ principle, the buoyant force on an object equals what?

a. The volume of fluid it displaces b. The weight of the fluid it displaces c. The density of the object d. The square area of the object

Answer: b. The buoyant force on an object equals the weight of the fluid it displaces. If the amount of displacement can be determined in water, for example, the weight of this water will be equal to the buoyant force.

5. In determining the capillary action of a liquid, what does it most depend on?

a. The liquid’s adhesive forces with the capillary tube b. The liquid’s cohesive forces with itself c. The difference between the adhesive forces and the cohesive forces d. The ratio of the adhesive forces and the cohesive forces

Answer: c. The difference between the adhesive forces and the cohesive forces determines the capillary action of the liquid.

6. A liquid is raised to a height because of capillary action. What is the proportionality of this height with the density of the liquid and the radius of the tube?

a. The height will be inversely proportional to the density and inversely proportional to the radius. b. The height will be directly proportional to the density and directly proportional to the radius. c. The height will be inversely proportional to the density and directly proportional to the radius. d. The height will be directly proportional to the density and inversely proportional to the radius.

Answer: a. The height depends on the surface tension but is inversely proportional to both the density of the liquid and the radius of the tube.

7. According to Bernoulli’s principle, in looking at the lift height of a static wing and its velocity, this velocity is related in what way to its height?

a. Height is proportional to its velocity. b. Height is inversely proportional to its velocity. c. As height rises, this is proportional to the square of its velocity d. As height rises, this is proportional to the square root of its velocity.

Answer: c. The lift height will be proportional to the square of its velocity. This means that velocity will exert an exponential effect on the lift height of a static wing in fluid such as air.

8. What will not increase turbulence in a fluid?

a. High viscosity b. Decreased flow of fluid c. Obstruction to flow d. Change in flow direction

Answer: b. In fact, increased flow of fluid will increase the turbulence because it increases the friction between layers of fluid flowing and increases the friction between the fluid and its environment.

9. In an object falling through a viscous fluid, what is the terminal velocity or terminal speed?

a. Its final speed before it reaches the bottom b. Its speed when the acceleration is zero c. Its speed when its mass is zero d. Its speed when the force of gravity is maximal

Answer: b. This terminal speed will be when its velocity is so great that there are drag forces that reduce the acceleration to zero. It will be in effect when substances fall in water as well as when sky divers fall from a plane through the air.

10. What can be said about the diffusion constant for a particular molecule in water?

a. It will increase with temperature and increase with molecular size. b. It will decrease with temperature and decrease with molecular size. c. It will decrease with temperature and increase with molecular size. d. It will increase with temperature and decrease with molecular size.

Answer: d. The diffusion constant of a given particle will increase with temperature and decrease with molecular size so that the greater the temperature, the greater the diffusion and the lower the molecular size, the greater the diffusion.