1. which of the following is a solid?
a. oxygen b. ice
c. water d. steam
2. which of these materials takes the shape of its container?
a. stone b. chair
c. water d. wood
3. the air we breathe in is an example of a _
a. solid b. liquid
c. gas d. vapour
4. which of the following is not a property of liquids?
a. they have a definite volume
b. they have a definite shape
c. they flow easily
d. they take the shape of their container
5. which material exists as gas at room temperature?
a. iron b. milk
c. oxygen d. salt
6. water is important to humans because it _
a. destroys metals
b. is used for cooking, washing, and drinking
c. has no use to living things
d. is only used for bathing
7. which of the following materials can change from solid to liquid when heated?
a. paper b. ice
c. stone d. wood
8. a mixture of gases surrounding the earth is called
a. air b. water
c. fire d. smoke
9. the physical states of matter are _
a. solid and liquid only
b. gas only
c. solid, liquid, and gas
d. air, water, and smoke
10. one importance of liquids to humans is that they _
a. occupy space
b. are used for construction of buildings
c. are used for drinking and cooling the body
d. have no definite volume

Question

Accepted Answer

# 1.
## Brief Explanations:
Solids have a definite shape and volume. Ice is the solid form of water. Oxygen is a gas, water is a liquid (at room temperature), and steam is water in the gas phase.
# Answer:
B. Ice

# 2.
## Brief Explanations:
Liquids take the shape of their container. Water is a liquid. Stone, chair, and wood are solids with definite shapes.
# Answer:
C. Water

# 3.
## Brief Explanations:
The air we breathe is a mixture of gases (like oxygen, nitrogen etc.). It is not a solid, liquid, or just vapour (vapour is a gas - like state of a substance that is usually liquid at room temperature).
# Answer:
C. gas

# 4.
## Brief Explanations:
Liquids have a definite volume, flow easily, and take the shape of their container. But they do not have a definite shape.
# Answer:
B. They have a definite shape

# 5.
## Brief Explanations:
Oxygen is a gas at room temperature. Iron is a solid, milk is a liquid, and salt is a solid.
# Answer:
C. Oxygen

# 6.
## Brief Explanations:
Water is crucial for humans as it is used in cooking (e.g., boiling food), washing (clothes, body etc.), and drinking. It does not destroy metals (corrosion is a different process and not the main importance), it is very useful for living things, and not just for bathing.
# Answer:
B. is used for cooking, washing, and drinking

# 7.
## Brief Explanations:
Ice (solid form of water) melts (changes from solid to liquid) when heated. Paper, stone, and wood do not change from solid to liquid easily at normal heating (they may burn etc. but not melt like ice).
# Answer:
B. Ice

# 8.
## Brief Explanations:
A mixture of gases surrounding the earth is called air. Water is a liquid (or solid/gas in different states but not a gas mixture around earth), fire is a chemical reaction, and smoke is a mixture of gases and particles but not the main gas mixture around earth.
# Answer:
A. air

# 9.
## Brief Explanations:
The physical states of matter are solid (definite shape and volume), liquid (definite volume, no definite shape), and gas (no definite shape or volume).
# Answer:
C. solid, liquid, and gas

# 10.
## Brief Explanations:
Liquids are important for humans as they are used for drinking (hydration) and cooling the body (e.g., sweating - water (a liquid) helps in cooling). Occupying space is a property of all matter (not a specific importance), solids are used for construction, and liquids have a definite volume.
# Answer:
C. are used for drinking and cooling the body

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