# Fluid Mechanics (Grade 7)

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## Fluid Mechanics

1.

Which one of the following is NOT considered a fluid?

- oil
- air
- sand
- liquid nitrogen

2.

is the mass per unit volume of a substance.

- Mass
- Weight
- Density
- Chemistry

3.

Whose principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object?

- Pascal
- Bernoulli
- Archimedes

4.

Whose principle states the pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid?

- Bernoulli
- Pascal
- Archimedes

5.

Whose principle states that, when force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid?

- Bernoulli
- Pascal
- Newton

6.

The upward force of water or air that keeps an object afloat is called .

- matter
- solid
- gas
- buoyancy

7.

Fluid pressure is always directed

- up.
- down.
- sideways.
- in all directions.

8.

According to Boyle's law, if the pressure placed upon a gas is increased,

- the volume will increase.
- the volume will decrease.
- the temperature will increase.
- the temperature will decrease.

9.

Air pressure is measured with a(n) .

- thermometer
- barometer
- anemometer
- psychrometer

10.

The force pushing on a surface divided by the area of that surface is .

- pressure
- gravity
- inertia

11.

What is the density of an object that has a mass of [math]184 g[/math] and a volume of [math]50 cm^3[/math]?

- [math]9200 g // cm^3[/math]
- [math]3.68 g // cm^3[/math]
- [math].271 g // cm^3[/math]
- [math]3.74 g // cm^3[/math]

12.

As the pressure of a gas at 2 atm is changed to 1 atm at a constant temperature, the volume of the gas .

- decreases
- increases
- remains the same

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