7th Grade Science Chapter 1 Test-matter
Questions and Answers
- 1.
Which of these is NOT matter?
- A.
A cloud
- B.
Your hair
- C.
Sunshine
- D.
The sun
Correct Answer
C. SunshineExplanation
Sunshine is not considered matter because it does not have mass or occupy space. It is a form of energy that is emitted by the sun and travels through space in the form of electromagnetic waves. While it can interact with matter, such as heating objects or causing chemical reactions, sunshine itself is not considered matter.Rate this question:
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- 2.
You accidentally break your pencil in half. This is an example of:
- A.
A physical change
- B.
A chemical change
- C.
Density
- D.
Weight
Correct Answer
A. A physical changeExplanation
Breaking a pencil in half is an example of a physical change because it does not involve a change in the chemical composition of the pencil. The pencil is still made of the same material, but it has been physically altered in shape. The breaking of the pencil is a reversible change, as the two halves can potentially be rejoined.Rate this question:
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- 3.
Which of the following statements about density is TRUE?
- A.
Density depends on mass and volume
- B.
Density is weight per unit volume
- C.
Density is measured in millimeters
- D.
Density is a chemical property
Correct Answer
A. Density depends on mass and volumeExplanation
Density is a measure of how much mass is contained in a given volume. It is calculated by dividing the mass of an object by its volume. Therefore, the statement "density depends on mass and volume" is true because the density of a substance is determined by the amount of mass it has and the volume it occupies.Rate this question:
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- 4.
Inertia increases as _____________ increases.
- A.
Time
- B.
Length
- C.
Mass
- D.
Volume
Correct Answer
C. MassExplanation
Inertia is the resistance of an object to changes in its state of motion. It depends on the mass of the object. As mass increases, the inertia of the object also increases. This means that it becomes harder to change the object's motion or stop it from moving. Therefore, the correct answer is mass.Rate this question:
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- 5.
An amount of vinegar would be expressed in ______________ for scientific experiments.
- A.
Centimeters or meters
- B.
Grams or milligrams
- C.
Liters or milliliters
- D.
Ounces or gallons
Correct Answer
C. Liters or millilitersExplanation
In scientific experiments, vinegar is typically measured in units of volume. The most common units for measuring liquids like vinegar are liters or milliliters. These units allow for precise and accurate measurements, which are important in scientific research. Centimeters and meters are units of length, grams and milligrams are units of mass, and ounces and gallons are units of weight or volume, but they are not commonly used for measuring vinegar in scientific experiments.Rate this question:
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- 6.
During physical changes, matter always retains its:
- A.
Size
- B.
Identity (same type of particles)
- C.
State
- D.
Texture
Correct Answer
B. Identity (same type of particles)Explanation
During physical changes, matter undergoes a transformation that does not alter its chemical composition. This means that the same type of particles, such as atoms or molecules, remain present in the substance before and after the change. While physical changes may affect the size, state, or texture of matter, the identity of the particles within the substance remains unchanged.Rate this question:
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- 7.
One way to compare the densities of oil and water is to pur the liquids into a glass container and observe how they:
- A.
Change color
- B.
Evaporate quickly
- C.
Separate into layers
- D.
Create an odor
Correct Answer
C. Separate into layersExplanation
When oil and water are poured into a glass container, they will separate into distinct layers due to their different densities. Oil is less dense than water, so it will float on top of the water. This separation occurs because oil molecules are nonpolar, while water molecules are polar. As a result, they do not mix well and form separate layers. The other options, such as changing color, evaporating quickly, or creating an odor, are not relevant to comparing the densities of oil and water.Rate this question:
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- 8.
The amount of space taken up by an object is knows as the objects:
- A.
Mass
- B.
Weight
- C.
Inertia
- D.
Volume
Correct Answer
A. MassExplanation
The amount of space taken up by an object refers to its volume, not its mass, weight, or inertia. Mass is the measure of the amount of matter in an object, weight is the force of gravity acting on an object, and inertia is the resistance of an object to changes in its motion.Rate this question:
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- 9.
When a canoe overturns, a pocket of air forms inside the canoe because air:
- A.
Has volume
- B.
Takes up space even though it's invisible
- C.
Is matter
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
When a canoe overturns, a pocket of air forms inside the canoe because air has volume, takes up space even though it's invisible, and is matter. Air molecules occupy a certain amount of space, and they have mass and occupy the same physical dimensions as other forms of matter. Therefore, when the canoe overturns, the air trapped inside creates a pocket of air.Rate this question:
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- 10.
To measure the volume of water correctly, read the scale on a graduated cylinder at the _______________ part of the meniscus.
- A.
Bottom
- B.
Outer
- C.
Top
- D.
None of the above
Correct Answer
A. BottomExplanation
When measuring the volume of water in a graduated cylinder, it is important to read the scale at the bottom part of the meniscus. The meniscus is the curved surface of the water in the cylinder, and reading it at the bottom ensures that the measurement is accurate. If the scale is read at the top or outer part of the meniscus, it may result in an incorrect volume reading.Rate this question:
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- 11.
Weight and ______________ are the same thing.
- A.
Mass
- B.
Volume
- C.
Inertia
- D.
None of the above
Correct Answer
D. None of the aboveExplanation
The given statement is "Weight and ______________ are the same thing." The correct answer is "none of the above" because weight and mass are not the same thing. Weight is the force exerted on an object due to gravity, while mass is the amount of matter in an object. Volume is the amount of space occupied by an object, and inertia is the resistance of an object to changes in its motion. Therefore, none of the options provided are the same as weight.Rate this question:
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- 12.
If you know the volume of the container a gas is in, then you know the ____________ of the gas.
- A.
Mass
- B.
Volume
- C.
Weight
- D.
Inertia
Correct Answer
B. VolumeExplanation
If you know the volume of the container a gas is in, then you know the volume of the gas. The volume of a gas refers to the amount of space it occupies within the container. Therefore, if you know the volume of the container, you can infer the volume of the gas inside it.Rate this question:
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- 13.
Over time, you can expect the amount of mass to change in a:
- A.
Bowling ball
- B.
Child
- C.
Table
- D.
Nail
Correct Answer
B. ChildExplanation
The amount of mass in a child can be expected to change over time due to growth and development. Children go through various stages of physical growth, which involves an increase in both height and weight. As they age, their bodies undergo changes in bone density, muscle mass, and overall body composition. This is in contrast to the other objects listed, such as a bowling ball, table, and nail, which do not typically experience significant changes in mass over time.Rate this question:
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- 14.
Gravity affects an objects:
- A.
Weight
- B.
Mass
- C.
Volume
- D.
Density
Correct Answer
A. WeightExplanation
Gravity affects an object's weight because weight is the force exerted on an object due to gravity. The gravitational force pulls objects towards the center of the Earth, and the weight of an object is the measure of the force with which it is pulled towards the Earth's center. Therefore, gravity directly influences the weight of an object.Rate this question:
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- 15.
Which of the following best describes weight?
- A.
A measure of the amount of matter in an object
- B.
The same as mass
- C.
Weight is different depending on where the object is in the Universe
- D.
Expressed in kilograms
Correct Answer
C. Weight is different depending on where the object is in the UniverseExplanation
Weight is a measure of the force exerted on an object due to gravity. It is directly proportional to the mass of the object and the acceleration due to gravity. Therefore, weight can vary depending on the location of the object in the universe because the strength of gravity is not constant everywhere.Rate this question:
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- 16.
The weight of an object depends on:
- A.
The mass of the object
- B.
The mass of Earth
- C.
The distance between the object and Earth
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The weight of an object depends on the mass of the object because weight is the force exerted on an object due to gravity, and mass determines the amount of matter in an object. The weight also depends on the mass of Earth because the gravitational force between the object and Earth is determined by the mass of both objects. Additionally, the weight depends on the distance between the object and Earth because the gravitational force weakens as the distance between the objects increases. Therefore, all of the given factors - the mass of the object, the mass of Earth, and the distance between the object and Earth - affect the weight of an object.Rate this question:
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- 17.
Tom's 7-year-old brother is more difficult to pick up than his 2-year-old sister because:
- A.
His brother has more inertia
- B.
His sister has more inertia
- C.
Boys are always heavier than girls
- D.
His brother has less mass than his sister
Correct Answer
A. His brother has more inertiaExplanation
Inertia is the resistance of an object to changes in its state of motion. The greater the mass of an object, the greater its inertia. In this case, the correct answer is that Tom's 7-year-old brother is more difficult to pick up than his 2-year-old sister because his brother has more inertia. This implies that his brother has more mass compared to his sister, making it harder to move or lift him.Rate this question:
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- 18.
Which of the following is an example of a physical change:
- A.
A silver spoon tarnishing
- B.
A cake baking in an oven
- C.
A popsicle melting
- D.
A car rusting
Correct Answer
C. A popsicle meltingExplanation
A popsicle melting is an example of a physical change because it involves a change in the state of matter. When a popsicle melts, it goes from a solid state to a liquid state, but its chemical composition remains the same. The molecules in the popsicle rearrange themselves, causing the solid ice to become liquid water. This change is reversible, as the liquid water can be frozen again to form a solid popsicle.Rate this question:
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- 19.
The melting of butter when it is left out in a warm room is an example of:
- A.
A physical change
- B.
A chemical change
- C.
A physical property
- D.
A chemical property
Correct Answer
A. A physical changeExplanation
When butter melts in a warm room, it undergoes a physical change. This is because the change in state from solid to liquid does not alter the chemical composition of the butter. The molecules in the butter rearrange themselves to form a liquid, but the substance itself remains the same. Physical changes are reversible, and in this case, the melted butter can solidify again when cooled. Therefore, the melting of butter in a warm room is an example of a physical change.Rate this question:
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- 20.
Although the Statue of Liberty is made of copper (originally an orange-brown color), it is green because the copper has interacted with substances in the air to form new substances with different properties. This is an example of:
- A.
A physical change
- B.
A chemical change
- C.
A physical property
- D.
A chemical property
Correct Answer
B. A chemical changeExplanation
The change in color of the Statue of Liberty from orange-brown to green is due to a chemical change. This is because the copper in the statue has reacted with substances in the air, such as oxygen and moisture, to form new substances with different properties. This chemical reaction has resulted in the formation of a green patina on the surface of the statue, giving it its iconic green color.Rate this question:
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- 21.
Considering that gold is one of the densest substances on Earth, which would you rather carry around school in your backpack all day, a kilogram of gold or a kilogram of feathers?
- A.
Feathers, because your backpack would feel lighter
- B.
Gold, because your backpack would feel lighter
- C.
Gold, because it would take up less space in your backpack
- D.
Feathers, because they would take up less space in your backpack
Correct Answer
C. Gold, because it would take up less space in your backpackExplanation
Gold is denser than feathers, which means that a kilogram of gold would take up less space in the backpack compared to a kilogram of feathers. Therefore, carrying a kilogram of gold would make the backpack feel lighter as it would occupy less volume.Rate this question:
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- 22.
Precious metals in catalytic converters on cars change harmful carbon monoxide exhaust fumes to harmless ones. This is an exmple of a ______________ change.
- A.
Physical
- B.
Chemical
- C.
Characteristic
- D.
Both (a) and (c)
Correct Answer
B. ChemicalExplanation
This is an example of a chemical change because the precious metals in catalytic converters undergo a chemical reaction with the carbon monoxide exhaust fumes, resulting in a change in their chemical composition and the formation of harmless substances.Rate this question:
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- 23.
Color, odor, mass and volume are ________ of an object
- A.
Chemical properties
- B.
Physical properties
- C.
Stationary properties
- D.
Inertial properties
Correct Answer
B. Physical propertiesExplanation
Color, odor, mass, and volume are characteristics that can be observed or measured without changing the chemical composition of an object. These properties are known as physical properties. They help in identifying and describing substances, but they do not involve any chemical reactions or transformations. Chemical properties, on the other hand, describe how a substance interacts with other substances and involve changes in its chemical composition. Stationary properties and inertial properties are not relevant terms for describing the characteristics of an object.Rate this question:
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- 24.
Flammability, solubility, and reactivity are ____________ of a substance.
- A.
Chemical properties
- B.
Physical properties
- C.
Stationary properties
- D.
Gravitational properties
Correct Answer
A. Chemical propertiesExplanation
Chemical properties refer to the characteristics of a substance that describe how it undergoes chemical reactions and interacts with other substances. Flammability, solubility, and reactivity are examples of chemical properties as they describe how a substance reacts with fire, dissolves in a solvent, and interacts with other substances, respectively. Physical properties, on the other hand, refer to characteristics that can be observed or measured without changing the substance's chemical composition, such as color, density, and melting point. Stationary properties and gravitational properties are not relevant in this context.Rate this question:
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- 25.
Being able to burn wood is an example of wood's:
- A.
Soluble properties
- B.
Chemical properties
- C.
Physical properties
- D.
Ductile properties
Correct Answer
B. Chemical propertiesExplanation
Being able to burn wood is an example of wood's chemical properties. This combustion involves a chemical reaction between wood and oxygen, resulting in the release of heat and other byproducts, showcasing the chemical characteristics of the material.Rate this question:
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- 26.
Your weight expressed in SI (metric) units would be in:
- A.
Newtons
- B.
Pounds
- C.
Liters
- D.
Both (a) and (c)
Correct Answer
A. NewtonsExplanation
Weight is a force, and in the SI (metric) system, force is measured in Newtons. Therefore, the correct answer is Newtons.Rate this question:
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- 27.
A sponge and brick that are the same size have the same:
- A.
Mass
- B.
Volume (space)
- C.
Weight
- D.
Density
Correct Answer
B. Volume (space)Explanation
A sponge and brick that are the same size have the same volume (space) because volume is a measure of the amount of space an object occupies. The size of an object is determined by its volume, which remains constant regardless of the material it is made of. Therefore, both the sponge and the brick, being the same size, would have the same volume.Rate this question:
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- 28.
What is the density of a substance that has a mass of 25g and a volume of 5 cubic cm:
- A.
5 g/cubic cm
- B.
8 g/cubic cm
- C.
30 g/cubic cm
- D.
20 g/cubic cm
Correct Answer
A. 5 g/cubic cmExplanation
The density of a substance is calculated by dividing its mass by its volume. In this case, the mass is given as 25g and the volume is given as 5 cubic cm. Therefore, the density can be calculated as 25g/5 cubic cm, which simplifies to 5 g/cubic cm.Rate this question:
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- 29.
A 120g block of pinewood has a volume of 300 cubic cm. Would this block float on water? (HINT: water has density of 1 g/cubic cm).
- A.
No, because the block is more dense than water
- B.
Yes, but a much larger block would not
- C.
Yes, because the block is less dense than water
- D.
Both (b) and (c)
Correct Answer
A. No, because the block is more dense than waterExplanation
The block of pinewood would not float on water because it is more dense than water. Density is determined by dividing the mass of an object by its volume. In this case, the block has a mass of 120g and a volume of 300 cubic cm. The density of the block can be calculated as 120g/300 cubic cm = 0.4 g/cubic cm. Since the density of water is 1 g/cubic cm, the block is more dense than water and would sink rather than float.Rate this question:
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- 30.
How would you measure the volume of a screw?
- A.
By placing it on a balance
- B.
By multiplying its length by its width by its height
- C.
By placing it on a spring scale
- D.
By placing it in a graduated cylinder of water and seeing how much liquid it displaces.
Correct Answer
D. By placing it in a graduated cylinder of water and seeing how much liquid it displaces.Explanation
To measure the volume of a screw, you can place it in a graduated cylinder of water and observe the amount of liquid it displaces. This method is based on the principle of displacement, where the volume of an object can be determined by the volume of liquid it displaces. By measuring the change in water level in the graduated cylinder before and after placing the screw, you can calculate the volume of the screw. This method is commonly used to measure the volume of irregularly shaped objects.Rate this question:
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- 31.
A book has a length of 5cm, a width of 2cm, and a height of 5cm. What is it's volume?
- A.
50cm
- B.
12 cubic cm
- C.
50 cubic cm
- D.
2,500 cm
Correct Answer
C. 50 cubic cmExplanation
The volume of a rectangular object can be calculated by multiplying its length, width, and height. In this case, the book has a length of 5cm, a width of 2cm, and a height of 5cm. Multiplying these values together (5cm x 2cm x 5cm) gives us a volume of 50 cubic cm.Rate this question:
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- 32.
Which of the following has the MOST GRAVITATIONAL PULL on it?
- A.
An elephant
- B.
A bowling ball
- C.
A golf ball
- D.
A table tennis ball
Correct Answer
A. An elephantExplanation
An elephant has the most gravitational pull on it because it has the highest mass out of all the given options. According to Newton's law of universal gravitation, the force of gravity between two objects is directly proportional to their masses. Therefore, the larger the mass of an object, the stronger its gravitational pull. Since an elephant is much larger and heavier compared to the other options, it will exert the greatest gravitational pull.Rate this question:
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- 33.
Which of the following has the LEAST GRAVITATIONAL PULL on it?
- A.
An elephant
- B.
A bowling ball
- C.
A golf ball
- D.
A table tennis ball
Correct Answer
D. A table tennis ballExplanation
The table tennis ball has the least gravitational pull on it because it is the smallest and lightest object among the options given. Gravitational pull is determined by the mass of an object, and since the table tennis ball has the least mass, it experiences the least gravitational force.Rate this question:
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- 34.
Think of a can of pop. Now, crush it. What are three PHYSICAL properties of the can?
- A.
Shiny, crushed, metallic
- B.
Crushed, rusts, metallic
- C.
Shiny, crushed, rusts
- D.
Crushed, rusts, smaller
Correct Answer
A. Shiny, crushed, metallicExplanation
The correct answer is shiny, crushed, metallic. These three physical properties accurately describe the can after it has been crushed. "Shiny" refers to the reflective surface of the can, "crushed" describes the change in shape or form of the can due to external force, and "metallic" indicates the material composition of the can.Rate this question:
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- 35.
What change caused the change in this can's appearance. (The one you just smashed).
- A.
A physical change
- B.
A chemical change
Correct Answer
A. A physical changeExplanation
The change in the can's appearance after being smashed is due to a physical change. Physical changes involve alterations in the physical properties of a substance, such as shape, size, or state, without any change in its chemical composition. In this case, the can's shape is altered as a result of being smashed, but its chemical composition remains the same.Rate this question:
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- 36.
Can you tell what the chemical properties of the can are just by looking at the can?
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
It is not possible to determine the chemical properties of the can just by looking at it. Chemical properties are determined by the composition and behavior of the substance, which cannot be visually assessed. The appearance of the can may provide some information about its physical properties, such as its shape, size, and color, but not its chemical properties. Therefore, the correct answer is "No."Rate this question:
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