Q: A living room has dimensions $$4\ \text{m} \times 6\ \text{m} \times 2.5\ \text{m}. If $$the density of air is $$1.2\ \text{kg/m}^3$$, what is the mass of air in the room?

$$m = 4 \times 6 \times 2.5 \times 1.2 = 72\ \text{kg}$$

Question 1

Which of the following best describes why solids retain their shape, unlike fluids?

Accepted Answer

Solids have atoms that are fixed in position due to strong intermolecular forces.

Question 2

Which of the following statements is TRUE about fluids?

Accepted Answer

Fluids can flow and take the shape of their container.

Question 3

A student wants to calculate the mass of water in a tank. The tank has a volume of $$2.0\ 	ext{m}^3$$ and the density of water is $$1000\ 	ext{kg/m}^3. $$Which equation should the student use?

Accepted Answer

$$m = \rho V$$

Question 4

Which of the following is NOT a characteristic of gases compared to liquids?

Accepted Answer

Gases have molecules that are close together and exert strong forces on each other.

Question 5

A living room has dimensions $$4\ 	ext{m} 	imes 6\ 	ext{m} 	imes 2.5\ 	ext{m}. If $$the density of air is $$1.2\ 	ext{kg/m}^3$$, what is the mass of air in the room?

Accepted Answer

$$m = 4 	imes 6 	imes 2.5 	imes 1.2 = 72\ 	ext{kg}$$

Question 6

Which of the following best defines density?

Accepted Answer

Density is the mass per unit volume of a substance.

Question 7

If a liquid has a density of $$0.8\ 	ext{g/cm}^3$$, what is its density in $$	ext{kg/m}^3$$?

Accepted Answer

$$800\ 	ext{kg/m}^3$$

Question 8

Which of the following is a correct statement about liquids?

Accepted Answer

Liquids cannot be easily compressed and take the shape of their container.

Question 9

A student measures the mass of a sample as $$250\ 	ext{g}$$ and its volume as $$200\ 	ext{cm}^3. $$What is the density in $$	ext{kg/m}^3$$?

Accepted Answer

$$1250\ 	ext{kg/m}^3$$

Question 10

Which of the following substances is considered a fluid?

Accepted Answer

Both water and air

Question 11

A solid object is submerged in a static fluid. Which assumption is made about the object and the fluid?

Accepted Answer

Both the object and the fluid are at rest.

Question 12

Which of the following is the SI unit for density?

Accepted Answer

$$	ext{kg/m}^3$$

Question 13

If a gas is compressed in a container, what happens to its density?

Accepted Answer

The density increases because the mass stays the same but the volume decreases.

Question 14

Which of the following best explains why liquids are not easily compressed?

Accepted Answer

The molecules in liquids are close together, leaving little space to compress.

Question 15

A container holds $$3.5\ 	ext{m}^3 of a $$fluid with a density of $$950\ 	ext{kg/m}^3. $$What is the mass of the fluid?

Accepted Answer

$$3325\ 	ext{kg}$$

Question 16

Which of the following is a property shared by both liquids and gases?

Accepted Answer

They both flow and take the shape of their container.

Question 17

A sample of oil has a mass of $$720\ 	ext{g}$$ and a volume of $$900\ 	ext{cm}^3. $$What is its density in $$	ext{kg/m}^3$$?

Accepted Answer

$$800\ 	ext{kg/m}^3$$

Question 18

Which of the following is a correct conversion for $$1\ 	ext{g/cm}^3 to$$ $$	ext{kg/m}^3$$?

Accepted Answer

$$1\ 	ext{g/cm}^3 = 1000\ 	ext{kg/m}^3$$

Question 19

Which of the following best describes the motion of molecules in a gas?

Accepted Answer

Molecules are in constant random motion and exert weak forces on each other.

Question 20

A student wants to compare the densities of two substances. Substance A has a mass of $$500\ 	ext{g}$$ and a volume of $$250\ 	ext{cm}^3. $$Substance B has a mass of $$1.2\ 	ext{kg}$$ and a volume of $$1\ 	ext{L}. $$Which substance has the higher density in $$	ext{kg/m}^3$$?

Accepted Answer

Substance B has the higher density.

Introduction to Fluids: States of Matter and Density

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