Maryland Integrated Science Assessment — Questions and Answers

Question 1: A student mixes two clear, colorless liquids in a beaker. They observe the formation of a white solid and notice the beaker feels warm to the touch. Which statement best explains these observations?

The liquids were contaminated, resulting in a precipitate.
The beaker absorbed heat from the room, causing a solid to form.
A chemical reaction occurred, indicated by the formation of a precipitate and a change in temperature. (Correct answer)
A physical change occurred, causing one liquid to freeze.

Correct answer: A chemical reaction occurred, indicated by the formation of a precipitate and a change in temperature.

The formation of a new substance with different properties (a solid precipitate from two liquids) and the release of energy as heat (an exothermic reaction) are two classic indicators that a chemical reaction has taken place.

Question 2: A student pushes a heavy box across a rough floor but the box does not move. Which statement best explains this situation?

The box has too much inertia to be moved.
The force of static friction is equal to and opposite the student's pushing force. (Correct answer)
The applied force is converted entirely into heat.
The force of the student's push is less than the force of gravity on the box.

Correct answer: The force of static friction is equal to and opposite the student's pushing force.

For the box to remain stationary, the net force must be zero. The student's push is an applied force. This force is being counteracted by an equal and opposite force of static friction from the floor. Until the student's push exceeds the maximum static friction, the box will not move.

Question 3: According to Newton's Law of Universal Gravitation, the gravitational force between two objects is inversely proportional to the square of the distance between them. If the distance between two planets is doubled, what happens to the gravitational force between them?

It is doubled.
It is halved.
It is reduced to one-fourth of its original value. (Correct answer)
It remains the same.

Correct answer: It is reduced to one-fourth of its original value.

The Law of Universal Gravitation follows an inverse square law. This means if the distance (r) is doubled, the new force is proportional to 1/(2r)², which equals 1/4r². Therefore, the force becomes one-fourth of its original value.

Question 4: What is the volume of a cube with a side length of 4 units?

32 cubic units
16 cubic units
8 cubic units
64 cubic units (Correct answer)

Correct answer: 64 cubic units

Explanation: To find the volume of a cube, you raise the length of one side to the power of 3. Given: Side length = 4 units Volume = Side length × Side length × Side length = 4 units × 4 units × 4 units = 64 cubic units

Question 5: What does the amplitude of a wave represent?

The maximum displacement of the medium from its resting position (Correct answer)
The speed at which the wave travels
The distance between two consecutive crests
The number of wave cycles per second

Correct answer: The maximum displacement of the medium from its resting position

Amplitude is the maximum displacement of particles in the medium from their equilibrium position, and it is related to the energy carried by the wave.

Question 6: Which of the following statements best describes the primary difference between how matter and energy move through an ecosystem?

Matter and energy are both fully recycled by decomposers.
Energy is created by producers, while matter is created by consumers.
Matter flows in one direction, while energy is recycled.
Matter is cycled within the ecosystem, while energy flows through it. (Correct answer)

Correct answer: Matter is cycled within the ecosystem, while energy flows through it.

The key principle of ecosystem dynamics is that matter (like carbon, nitrogen, and water) is continuously cycled between living and nonliving components. In contrast, energy flows in one direction: from the sun, through the trophic levels, and is eventually lost as heat. It is not recycled.

Question 7: Synthetic fabrics are becoming increasingly popular in the fashion industry. Made from artificial materials, these fabrics offer durability and affordability. However, they also raise concerns about environmental sustainability and the use of petrochemicals in their production. Which word is a synonym for "synthetic"?

Organic
Man-made (Correct answer)
Natural
Biodegradable

Correct answer: Man-made

Explanation: "Synthetic" refers to materials made artificially rather than occurring naturally, making "man-made" a suitable synonym.

Question 8: A plant's roots grow into the cracks of a large rock. As the roots grow larger and thicker, they exert pressure on the rock, eventually causing it to break apart. This process, known as root wedging, is an example of the:

geosphere causing changes in the biosphere.
biosphere causing physical weathering of the geosphere. (Correct answer)
atmosphere causing erosion of the biosphere.
hydrosphere causing chemical weathering of the geosphere.

Correct answer: biosphere causing physical weathering of the geosphere.

A living organism, the plant (biosphere), is physically breaking down a non-living material, the rock (geosphere). This is a form of mechanical or physical weathering driven by a biological process.

Question 9: What is the perimeter of a rectangle with a length of 8 meters and a width of 5 meters?

40 meters
13 meters
26 meters (Correct answer)
18 meters

Correct answer: 26 meters

Explanation: The perimeter of a rectangle is calculated by adding all four sides. For this rectangle: Length = 8 meters Width = 5 meters Perimeter = 2*(Length + Width) = 2*(8 + 5) = 2*(13) = 26 meters

Question 10: In a closed system, 22 grams of reactant X are completely reacted with 8 grams of reactant Y. According to the Law of Conservation of Mass, what is the expected total mass of the products?

More than 30 grams if the reaction is exothermic.
14 grams.
Less than 30 grams if a gas is produced.
30 grams. (Correct answer)

Correct answer: 30 grams.

The Law of Conservation of Mass states that in a closed system, mass is neither created nor destroyed. Therefore, the total mass of the reactants must equal the total mass of the products. In this case, 22 g + 8 g = 30 g.

Question 11: Polar bears, majestic creatures of the Arctic, are facing a dire threat due to climate change. As temperatures rise, their sea ice habitat is melting away, forcing them to travel longer distances to hunt for food. Without action to combat climate change, these magnificent animals may face extinction. What is the main idea of the passage?

The importance of recycling
The benefits of exercise
The impact of climate change on polar bears (Correct answer)
The history of space exploration

Correct answer: The impact of climate change on polar bears

Explanation: The passage discusses how climate change affects polar bears' habitat and survival, emphasizing the dire threat they face due to melting sea ice.

Question 12: A large area of rainforest is cleared and burned to make way for agriculture. Which of the following describes the most significant, direct impact of this action on the global climate?

An increase in atmospheric oxygen levels from the burning of plant matter.
A decrease in the Earth's capacity to absorb carbon dioxide from the atmosphere. (Correct answer)
A temporary cooling effect from the smoke and ash blocking sunlight.
A major disruption in local wind patterns, leading to fewer hurricanes.

Correct answer: A decrease in the Earth's capacity to absorb carbon dioxide from the atmosphere.

Forests, especially large rainforests, act as critical 'carbon sinks,' absorbing massive amounts of CO₂ from the atmosphere for photosynthesis. Deforestation not only releases the carbon stored in the trees back into the atmosphere but also permanently removes that area's ability to absorb CO₂, leading to a net increase in greenhouse gases.

Question 13: A state government offers incentives for power companies to close coal-fired power plants and build wind and solar farms instead. What is the primary climate-related benefit of this shift in energy production?

Wind and solar farms take up less land area than coal mines.
It eliminates all environmental impacts associated with energy generation.
It reduces the emission of greenhouse gases that cause global warming. (Correct answer)
It guarantees a constant and uninterrupted supply of electricity.

Correct answer: It reduces the emission of greenhouse gases that cause global warming.

The primary climate benefit of switching from fossil fuels like coal to renewable sources like wind and solar is the significant reduction in greenhouse gas emissions. Coal plants release large amounts of CO₂ during combustion, while wind and solar generate electricity with little to no direct emissions.

Question 14: The process of chemical weathering, where slightly acidic rainwater dissolves limestone to form caves, is a primary example of an interaction between which two spheres?

Geosphere and Atmosphere
Atmosphere and Biosphere
Hydrosphere and Geosphere (Correct answer)
Biosphere and Hydrosphere

Correct answer: Hydrosphere and Geosphere

Rainwater (hydrosphere) acts as a chemical agent that breaks down and erodes the limestone rock (geosphere) over long periods, creating geological features like caves.

Question 15: Which of the following scenarios describes an object experiencing a net unbalanced force?

A helium balloon floating stationary in the middle of a room.
A car driving in a straight line at a constant 60 mph.
A book resting motionless on a tabletop.
A satellite orbiting Earth at a constant speed. (Correct answer)

Correct answer: A satellite orbiting Earth at a constant speed.

A net unbalanced force causes acceleration, which is a change in velocity (speed or direction). A satellite orbiting Earth is constantly changing its direction, so it is continuously accelerating due to the unbalanced force of gravity, which acts as a centripetal force.

Question 16: Ultraviolet (UV) radiation from the Sun can cause sunburn because it:

Has higher frequency than visible light and carries enough energy to damage skin cells (Correct answer)
Travels faster than visible light and delivers energy more quickly
Has a longer wavelength than visible light and carries more heat energy
Reflects off the atmosphere and is concentrated on Earth's surface

Correct answer: Has higher frequency than visible light and carries enough energy to damage skin cells

UV radiation has higher frequency and more energy per photon than visible light, giving it enough energy to break chemical bonds and damage DNA in skin cells.

Question 17: The pelvic bones of modern whales are small, non-functional structures that are remnants of the hind limbs of their land-dwelling ancestors. These non-functional structures are best described as:

Vestigial structures (Correct answer)
Homologous structures
Analogous structures
Embryonic structures

Correct answer: Vestigial structures

Vestigial structures are genetically determined features that have lost most or all of their ancestral function in a given species but were functional in an ancestor. The whale's pelvic bones are a classic example, providing evidence of their evolution from four-legged terrestrial mammals.

Question 18: What is the next number in the sequence: 2, 5, 8, 11, ...?

14 (Correct answer)
13
12
15

Correct answer: 14

Explanation: To find the next number in the sequence, we observe that each number is increasing by 3: 2, 5, 8, 11,... So, to find the next number, we add 3 to the last number in the sequence: 11 + 3 = 14

Question 19: A soccer ball with a mass of 0.45 kg is kicked by a player. The ball accelerates at 20 m/s². What is the net force applied to the ball?

9 N (Correct answer)
0.0225 N
20.45 N
44.4 N

Correct answer: 9 N

According to Newton's Second Law of Motion, the net force on an object is the product of its mass and acceleration (F=ma). To find the force, multiply the mass (0.45 kg) by the acceleration (20 m/s²), which equals 9 N.

Question 20: How do radio waves and visible light differ?

Radio waves carry more energy per photon than visible light
Radio waves travel faster than visible light in a vacuum
Radio waves have much longer wavelengths and lower frequencies than visible light (Correct answer)
Radio waves require a medium to travel; visible light does not

Correct answer: Radio waves have much longer wavelengths and lower frequencies than visible light

Radio waves have wavelengths ranging from millimeters to kilometers and much lower frequencies than visible light, placing them at the opposite end of the electromagnetic spectrum.

Question 21: If x = 7, what is the value of 2x − 3?

10
11 (Correct answer)
9
8

Correct answer: 11

Explanation: If x = 7, we can substitute this value into the expression 2x − 3 and calculate the result: 2x − 3 = 2 (7) − 3 = 14−3 = 11

Question 22: Which of the following is a primary characteristic that distinguishes the inner planets (Mercury, Venus, Earth, Mars) from the outer planets (Jupiter, Saturn, Uranus, Neptune)?

The inner planets have extensive ring systems, while the outer planets do not.
The inner planets are primarily composed of rock and metal, while the outer planets are primarily composed of gas and ice. (Correct answer)
The inner planets are much larger and less dense than the outer planets.
The inner planets have many moons, while the outer planets have few or no moons.

Correct answer: The inner planets are primarily composed of rock and metal, while the outer planets are primarily composed of gas and ice.

The primary distinction between the two groups of planets is their composition. The inner, or terrestrial, planets have solid, rocky surfaces. The outer planets are known as gas giants (Jupiter, Saturn) or ice giants (Uranus, Neptune) and are composed mainly of lighter elements like hydrogen, helium, and ices without a solid surface.

Question 23: In a small village nestled among the hills, a young boy named David embarks on a perilous journey to save his family from a fierce dragon that terrorizes the land. With bravery and determination, he faces unimaginable challenges to restore peace to his home. What is the theme of the story?

Friendship
Love
Courage (Correct answer)
Betrayal

Correct answer: Courage

Explanation: The theme of courage is evident as the protagonist, David, bravely faces the challenges posed by the fierce dragon to save his family and restore peace to his village.

Question 24: An instant cold pack is activated by breaking an inner pouch, allowing two substances to mix. The pack quickly becomes very cold. This is an example of what type of process?

An exothermic reaction
An endothermic reaction (Correct answer)
A combustion reaction
A physical change

Correct answer: An endothermic reaction

An endothermic reaction is a process that absorbs heat from its surroundings. This absorption of heat causes the temperature of the surroundings (the pack itself) to decrease, making it feel cold.

Question 25: The chemical reaction 2 H₂O₂ → 2 H₂O + O₂ shows hydrogen peroxide changing into water and oxygen gas. How is this type of reaction best classified?

Synthesis
Double-replacement
Single-replacement
Decomposition (Correct answer)

Correct answer: Decomposition

A decomposition reaction occurs when a single, more complex compound breaks down into two or more simpler substances. In this case, hydrogen peroxide (H₂O₂) breaks down into water (H₂O) and oxygen (O₂).

Question 26: What wave property determines the pitch of a sound?

Amplitude
Frequency (Correct answer)
Wavelength in vacuum
Speed in air

Correct answer: Frequency

Pitch is determined by frequency; higher-frequency sound waves produce higher-pitched sounds.

Question 27: For a total solar eclipse to be observed from a specific location on Earth, which of the following alignments of the Sun, Moon, and Earth must occur?

The Moon must be positioned directly between the Sun and Earth. (Correct answer)
The Sun must be positioned directly between the Earth and the Moon.
The Sun, Earth, and Moon must form a right angle.
The Earth must be positioned directly between the Sun and the Moon.

Correct answer: The Moon must be positioned directly between the Sun and Earth.

A solar eclipse occurs when the Moon passes between the Sun and Earth, casting a shadow on Earth's surface. For a total eclipse, the alignment must be precise, with the Moon completely blocking the Sun's disk from the viewer's perspective on Earth.

Question 28: Which of the following is required for natural selection to occur in a population?

The population must be geographically isolated from other populations.
There must be heritable variation for a trait within the population. (Correct answer)
All individuals in the population must be genetically identical.
The environment must remain stable and unchanging over a long period.

Correct answer: There must be heritable variation for a trait within the population.

Natural selection can only act on traits that have a genetic basis and vary among individuals in a population. Without heritable variation, there are no differences in survival and reproduction for selection to favor, and the population cannot evolve.

Question 29: Solve for x in the equation 3 (x − 2) = 15.

6
5
8
7 (Correct answer)

Correct answer: 7

Explanation: To solve the equation 3 (x − 2) = 15, follow these steps: Distribute the 3 to both terms inside the parentheses: 3 × X − 3 × 2 = 15 3x − 6 = 15 Add 6 to both sides of the equation: 3x − 6 + 6 = 15 + 6 3x = 21 Divide both sides by 3 to isolate x: 3𝑥/3 = 21/3 x = 7

Question 30: Which region of the electromagnetic spectrum carries the most energy per photon?

Visible light
Gamma rays (Correct answer)
Infrared radiation
Radio waves

Correct answer: Gamma rays

Gamma rays have the highest frequency and shortest wavelength in the electromagnetic spectrum, giving them the greatest energy per photon.

Question 31: A population of beetles lives on the bark of trees that are gradually darkening over time due to industrial pollution. Within the beetle population, there is variation in color, from light gray to dark gray. Which of the following outcomes is the most likely result of natural selection in this scenario?

The beetles will try to change their color to match the trees, and their offspring will be born with the darker color.
The light-gray beetles will survive and reproduce more successfully than the dark-gray beetles.
The frequency of the alleles for dark gray coloration will increase in the population over generations. (Correct answer)
The beetle population will migrate to an area with lighter-colored trees.

Correct answer: The frequency of the alleles for dark gray coloration will increase in the population over generations.

Natural selection acts on existing variation within a population. In this environment, darker beetles have a selective advantage because they are better camouflaged from predators on the darkening trees. As a result, they are more likely to survive and reproduce, passing the alleles for dark coloration to their offspring. Over time, this will lead to an increase in the frequency of these alleles in the population's gene pool.

Question 32: A major volcanic eruption ejects large amounts of sulfur dioxide and ash into the stratosphere. This leads to a temporary global cooling effect because the particles reflect incoming solar radiation. This event primarily illustrates an interaction between which two Earth systems?

Geosphere and Atmosphere (Correct answer)
Hydrosphere and Biosphere
Atmosphere and Biosphere
Geosphere and Hydrosphere

Correct answer: Geosphere and Atmosphere

The volcano is part of the geosphere (solid Earth), and it releases ash and gases into the air, which is the atmosphere. This interaction directly impacts atmospheric composition and clarity, leading to climate effects.

Question 33: Which statement best explains why electromagnetic waves can travel through the vacuum of space but sound waves cannot?

Sound waves lose energy quickly while electromagnetic waves do not
Sound waves have too low a frequency to travel through a vacuum
Electromagnetic waves travel faster than sound, allowing them to cross empty space
Electromagnetic waves are self-propagating disturbances in electric and magnetic fields and need no medium, whereas sound waves require matter to transmit compressions (Correct answer)

Correct answer: Electromagnetic waves are self-propagating disturbances in electric and magnetic fields and need no medium, whereas sound waves require matter to transmit compressions

Electromagnetic waves are oscillating electric and magnetic fields that sustain each other as they travel, requiring no material medium, while sound waves are pressure disturbances that need matter (particles) to propagate.

Question 34: The world's oceans absorb a significant amount of the carbon dioxide released into the atmosphere by human activities. Which of the following is a direct chemical consequence of this absorption?

A rapid increase in dissolved oxygen levels, benefiting most fish.
A decrease in the average salinity of the ocean's surface waters.
Increased ocean acidity, which harms marine organisms with shells. (Correct answer)
A significant increase in the ocean's average temperature.

Correct answer: Increased ocean acidity, which harms marine organisms with shells.

When excess carbon dioxide (CO₂) dissolves in seawater, it forms carbonic acid (H₂CO₃), which lowers the ocean's pH. This process, known as ocean acidification, reduces the availability of carbonate ions that marine organisms like corals, clams, and oysters need to build their shells and skeletons.

Question 35: The chemical equation for the combustion of methane is: CH₄ + 2 O₂ → CO₂ + 2 H₂O. In this reaction, which of the following are the reactants?

O₂ and H₂O
CO₂ and H₂O
CH₄ and O₂ (Correct answer)
CH₄ and CO₂

Correct answer: CH₄ and O₂

In a chemical equation, the substances written on the left side of the reaction arrow (→) are the reactants, which are the starting materials. The substances on the right side are the products. Therefore, methane (CH₄) and oxygen (O₂) are the reactants.

Question 36: An observer on Earth sees a full moon. Approximately one week later, which lunar phase will the observer most likely see?

Another Full Moon
First Quarter Moon
Third Quarter Moon (Correct answer)
New Moon

Correct answer: Third Quarter Moon

The lunar cycle takes about 29.5 days to complete. The phases proceed in a specific order: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Third Quarter, and Waning Crescent. The Third Quarter (or Last Quarter) phase occurs approximately one week after the Full Moon, when the Moon has completed another quarter of its orbit and appears as a half-moon.

Question 37: What is the result of 3 × (4 + 2) − 8?

10 (Correct answer)
18
20
6

Correct answer: 10

Explanation: Follow the order of operations: first, perform the operation inside the parentheses, then multiplication, and finally subtraction.

Question 38: A student drops a rubber ball from a height of one meter. The ball bounces back up, but not to its original height. According to the Law of Conservation of Energy, what best explains why the ball does not reach its starting height?

Some mechanical energy was converted into thermal and sound energy. (Correct answer)
The force of gravity on the ball decreased after the bounce.
Some of the ball's energy was destroyed during the bounce.
The ball did not have enough kinetic energy to begin with.

Correct answer: Some mechanical energy was converted into thermal and sound energy.

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed. When the ball hits the floor, some of its kinetic energy is converted into other forms, primarily thermal energy (heat) due to friction and the deformation of the ball, and sound energy. This loss of mechanical energy prevents it from returning to its original height.

Question 39: In multicellular organisms, cells differentiate to perform specific jobs. Which statement best explains how different cell types, like muscle cells and nerve cells, develop from a single fertilized egg?

Random mutations cause cells to develop into different types.
Cells acquire different genes as they divide and migrate.
Each cell type contains different genes.
Different genes are activated or expressed in each cell type. (Correct answer)

Correct answer: Different genes are activated or expressed in each cell type.

All somatic cells in an organism generally contain the same full set of genes (genome). Cell differentiation occurs because specific genes are 'turned on' (expressed) or 'turned off' in different cells, leading to the production of specific proteins that determine the cell's unique structure and function.

Question 40: A student pushes a heavy box across a rough floor. After the student stops pushing, the box slides for a short distance and then stops. The student observes that the bottom of the box and the floor feel slightly warmer. This is because the box's kinetic energy was converted primarily into:

radiant energy.
thermal energy. (Correct answer)
potential energy.
chemical energy.

Correct answer: thermal energy.

Friction is a force that opposes motion. As the box slides across the rough floor, friction does work on the box, converting its kinetic energy (energy of motion) into thermal energy (heat). This is why both the box and the floor feel warmer after the interaction.

Question 41: Despite his fear, the knight displayed valor in the face of danger, charging bravely into battle against the fearsome dragon. Which word is an antonym for "bravery"?

Valor
Courage
Cowardice (Correct answer)
Fearlessness

Correct answer: Cowardice

Explanation: Cowardice means lacking courage or bravery, making it the antonym of bravery in this context.

Question 42: What is refraction?

The bending of a wave as it passes from one medium into another (Correct answer)
The spreading of a wave around an obstacle
The combination of two waves to form a new wave
The bouncing of a wave off a surface

Correct answer: The bending of a wave as it passes from one medium into another

Refraction is the bending of a wave's path that occurs when it crosses a boundary between two media with different wave speeds.

Question 43: A student in Maryland observes that the days are much longer and the weather is warmer in June than in December. Which statement best explains this seasonal variation?

Increased sunspot activity on the Sun's surface releases more heat in June.
The Northern Hemisphere is tilted toward the Sun in June, receiving more direct solar energy. (Correct answer)
The Earth's rotation on its axis speeds up during the summer months, increasing daylight hours.
Earth's orbit is an ellipse, and Earth is closer to the Sun in the summer.

Correct answer: The Northern Hemisphere is tilted toward the Sun in June, receiving more direct solar energy.

Earth has seasons because its axis is tilted at approximately 23.5 degrees. When the Northern Hemisphere is tilted toward the Sun, it receives sunlight at a more direct angle and for a longer duration each day, resulting in summer. When it is tilted away, it receives less direct sunlight, resulting in winter. Earth is actually closest to the Sun in its orbit during the Northern Hemisphere's winter.

Question 44: What is diffraction?

The increase in wave amplitude near a resonant frequency
The reflection of waves off a smooth surface
The change in wave speed when entering a new medium
The spreading of waves as they pass through an opening or around an obstacle (Correct answer)

Correct answer: The spreading of waves as they pass through an opening or around an obstacle

Diffraction is the bending and spreading of waves when they encounter an opening or obstacle, and it is most pronounced when the opening is comparable in size to the wavelength.

Question 45: Imagine a hypothetical scenario where a new planet, with twice the mass of Earth, is discovered orbiting the Sun at the same distance as Earth. How would the Sun's gravitational force on this new planet compare to its force on Earth?

The gravitational force would be four times as strong.
The gravitational force would remain the same.
The gravitational force would be half as strong.
The gravitational force would be twice as strong. (Correct answer)

Correct answer: The gravitational force would be twice as strong.

According to Newton's Law of Universal Gravitation, the gravitational force between two objects is directly proportional to the product of their masses. If the distance remains constant and the mass of one object (the planet) is doubled, the gravitational force between it and the Sun will also double.

Question 46: According to the most widely accepted scientific theory, how did the planets in our solar system form?

They were ejected as large molten masses directly from the surface of the Sun.
They formed from the gradual accumulation of dust and gas in a rotating disk around the young Sun. (Correct answer)
They are the remaining fragments from an ancient collision between two massive stars.
They were captured by the Sun's gravity as they traveled through deep space.

Correct answer: They formed from the gradual accumulation of dust and gas in a rotating disk around the young Sun.

The nebular hypothesis is the most accepted model for the formation of the solar system. It states that a giant cloud of gas and dust (a nebula) collapsed under gravity, forming a spinning protoplanetary disk. The Sun formed at the center, and the planets were created through the process of accretion, where dust and gas particles stuck together and gradually grew larger.

Question 47: Solve for x in the equation 2x + 5 = 13.

4 (Correct answer)
8
6
10

Correct answer: 4

Explanation: To solve the equation 2x + 5 = 13: Subtract 5 from both sides: 2x = 13 − 5 2x = 8 Now, divide both sides by 2 to solve for x: x = 8/2 x = 4

Question 48: Sound waves traveling through air are best classified as which type of wave?

Longitudinal waves (Correct answer)
Transverse waves
Surface waves
Electromagnetic waves

Correct answer: Longitudinal waves

Sound waves are longitudinal (compressional) waves in which particle displacement is parallel to the direction the wave travels.

Question 49: A swimmer pushes backward on the water with their hands. In response, the water pushes the swimmer forward. This is a direct application of which principle?

The Law of Action-Reaction (Newton's Third Law) (Correct answer)
The Law of Universal Gravitation
The Law of Inertia (Newton's First Law)
The Law of Force and Acceleration (Newton's Second Law)

Correct answer: The Law of Action-Reaction (Newton's Third Law)

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. The swimmer's push on the water is the 'action,' and the water pushing back on the swimmer with an equal and opposite force is the 'reaction,' which propels the swimmer forward.

Question 50: A student is riding a skateboard at a constant velocity. Suddenly, the skateboard hits a crack in the sidewalk and stops, but the student continues to move forward. Which of the following principles best explains why the student continues to move forward?

Friction
Inertia (Newton's First Law) (Correct answer)
Gravitational Force
Newton's Third Law (Action-Reaction)

Correct answer: Inertia (Newton's First Law)

This is an example of Newton's First Law of Motion, also known as the law of inertia. The student's body was in motion and tends to remain in motion with the same velocity, even after the skateboard was stopped by an external force.

Question 51: What is the value of 15 − 3× (4 + 2)?

9
5
21
3 (Correct answer)

Correct answer: 3

Explanation: To solve the expression 15 − 3 × (4 + 2), follow the order of operations (PEMDAS/BODMAS): Perform the operation inside the parentheses: 4 + 2 = 6 Multiply: 3 × 6 = 18 Subtract: 15 − 18 = −3

Question 52: Against all odds, the underdog team emerged victorious, their triumph a testament to the power of perseverance and hard work. What is the moral of the story?

Hard work leads to success. (Correct answer)
Honesty is the best policy.
Love conquers all.
Good things come to those who wait.

Correct answer: Hard work leads to success.

Explanation: The passage highlights the underdog team's victory as a result of their perseverance and hard work, conveying the message that success is achievable through dedication and effort.

Question 53: In a hydroelectric power plant, a dam holds back a large volume of water in a reservoir. When the water is released, it flows through a turbine, which spins a generator to produce electricity. What is the correct sequence of energy transformations in this process?

Kinetic energy → Electrical energy → Potential energy
Chemical energy → Kinetic energy → Electrical energy
Potential energy → Kinetic energy → Electrical energy (Correct answer)
Thermal energy → Mechanical energy → Electrical energy

Correct answer: Potential energy → Kinetic energy → Electrical energy

The water held in the reservoir at a high elevation possesses gravitational potential energy. When released, this potential energy is converted into kinetic energy as the water flows downwards. The moving water spins a turbine (mechanical energy), which powers a generator that converts this motion into electrical energy.

Question 54: Which of the following scenarios best describes a direct interaction where the biosphere affects the hydrosphere?

A river carves a channel through soil and rock.
Extensive growth of algae in a lake depletes oxygen levels in the water. (Correct answer)
Wind blows across a lake, creating waves.
A glacier melts, adding fresh water to the ocean.

Correct answer: Extensive growth of algae in a lake depletes oxygen levels in the water.

Algae are living organisms, part of the biosphere. Their life processes (growth, death, and decomposition) directly alter the chemical composition (oxygen levels) of the lake water, which is part of the hydrosphere.

Question 55: The large-scale removal of forests (deforestation) can lead to increased soil erosion. Without tree roots to hold the soil in place, wind and rain can wash it away more easily. This chain of events demonstrates how a change in the can directly impact the .

atmosphere; hydrosphere
biosphere; geosphere (Correct answer)
geosphere; biosphere
hydrosphere; atmosphere

Correct answer: biosphere; geosphere

The removal of trees and other plants, which are part of the biosphere, directly leads to the loss of soil, which is part of the geosphere. The living components are failing to protect the non-living, solid Earth component.

Maryland Integrated Science Assessment

The MISA (Maryland Integrated Science Assessment) is a state science exam administered to Maryland students in grades 5, 8, and high school, assessing mastery of Next Generation Science Standards across life science, physical science, Earth and space science, and engineering through real-world scenario-based item sets.

Questions

200 min

Time Limit

50%

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