M2.2 Cat A Fluid dynamics

What does density describe?

• The color of a material

• How closely packed the particles are in a solid, liquid or gas

• The temperature of a material

• The shape of a material

How are particles arranged in a gas?

• Tightly packed and in a regular structure

• Tightly packed but free to move

• Spread out and move randomly

• Fixed in place

What is specific gravity also known as?

• Relative density

• Absolute density

• Mass density

• Volume density

What happens to the density of a gas compared to its liquid or solid state?

• It becomes more dense

• It becomes less dense

• It stays the same

• It disappears

What does specific gravity compare?

• The color of two materials

• The density of a material to a reference substance

• The temperature of two materials

• The volume of two materials

What is the SI unit for mass?

• Kilograms (kg)

• Grams (g)

• Pounds (lb)

• Ounces (oz)

What is the specific gravity (SG) compared with for liquids and solids?

• Water at 4 °C

• Air at room temperature

• Ice at 0 °C

• Steam at 100 °C

What is the SG of pure water?

• 1

• 0.785

• 0.82

• 13.6

Which substance has an SG of 0.917?

• Ice

• Air

• Helium

• Gasoline

What is the approximate reading of a hydrometer in a discharged battery?

• 1200

• 1150

• 1300

• 1250