Maryland Integrated Science Assessment — Questions and Answers

Question 1: 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?

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

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

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 3: "John gazed up at the night sky, mesmerized by the twinkling stars. They seemed to dance playfully in the vast expanse above him. He couldn't help but feel a sense of wonder and awe at the beauty of the universe." Which literary device is used in the sentence, "The stars danced playfully in the night sky"?

Hyperbole
Metaphor
Simile
Personification (Correct answer)

Correct answer: Personification

Explanation: Personification is when human characteristics are attributed to non-human entities, like stars dancing in this sentence.

Question 4: A student observes a cell under a microscope and notes the presence of a cell wall, ribosomes, and a circular loop of DNA not enclosed in a nucleus. Which of the following is the most likely classification for this cell?

A plant cell
A fungal cell
A prokaryotic cell (Correct answer)
An animal cell

Correct answer: A prokaryotic cell

The defining characteristics described—a cell wall, ribosomes, and genetic material not contained within a nucleus—are all hallmarks of a prokaryotic cell, such as a bacterium. Plant and fungal cells are eukaryotic and have a nucleus, and animal cells lack a cell wall.

Question 5: 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?

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

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 6: 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?

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.
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)

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 7: 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?

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

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

26 meters (Correct answer)
13 meters
40 meters
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 9: Which human activity is the largest source of the excess carbon dioxide (CO₂) that is enhancing the greenhouse effect and causing recent climate change?

Large-scale deforestation, particularly in tropical regions.
The use of chemical fertilizers in large-scale agriculture.
The disposal of organic waste in municipal landfills.
The burning of fossil fuels for electricity, heat, and transportation. (Correct answer)

Correct answer: The burning of fossil fuels for electricity, heat, and transportation.

The combustion of fossil fuels (coal, oil, and natural gas) for energy is the single largest human-caused source of carbon dioxide emissions. This process releases vast amounts of carbon that were stored underground for millions of years, significantly increasing the concentration of CO₂ in the atmosphere.

Question 10: What is the result of 3 × (4 + 2) − 8?

18
10 (Correct answer)
20
6

Correct answer: 10

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

Question 11: In pea plants, the allele for purple flowers (P) is dominant over the allele for white flowers (p). If a heterozygous purple-flowered plant (Pp) is crossed with a white-flowered plant (pp), what is the probability that an offspring will have white flowers?

100%
75%
50% (Correct answer)
25%

Correct answer: 50%

This is a monohybrid cross. A Punnett square for this cross (Pp x pp) shows that the possible genotypes for the offspring are Pp and pp. The probability of producing a Pp genotype is 2/4 (50%), and the probability of producing a pp genotype is 2/4 (50%). Since the white flower trait is recessive, it is only expressed in the homozygous recessive (pp) genotype. Therefore, there is a 50% probability of an offspring having white flowers.

Question 12: 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 beaker absorbed heat from the room, causing a solid to form.
The liquids were contaminated, resulting in a precipitate.
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 13: A student wants to increase the rate of reaction between a solid lump of calcium carbonate and a hydrochloric acid solution. Which of the following actions would be LEAST effective at increasing the reaction rate?

Crushing the lump of calcium carbonate into a powder.
Stirring the mixture continuously.
Gently warming the hydrochloric acid solution.
Decreasing the concentration of the hydrochloric acid solution. (Correct answer)

Correct answer: Decreasing the concentration of the hydrochloric acid solution.

Decreasing the concentration of a reactant reduces the number of reactant particles in a given volume, which leads to fewer collisions per unit of time and therefore slows down the reaction rate. Increasing surface area (crushing), increasing temperature, and agitating the mixture all increase the reaction rate.

Question 14: If a car travels at a speed of 60 miles per hour, how far will it travel in 2.5 hours?

120 miles
150 miles (Correct answer)
200 miles
175 miles

Correct answer: 150 miles

Explanation: To find the distance traveled, we multiply the speed (rate) by the time traveled. Given: Speed = 60 miles per hour Time = 2.5 hours Distance = Speed × Time Distance = 60 miles/hour × 2.5 hours Distance = 150 miles

Question 15: Which of the following scenarios is the best example of elastic potential energy being converted into kinetic energy?

A stretched rubber band being released to fly across a room (Correct answer)
A candle burning and giving off light
A rock sitting at the top of a cliff
A car accelerating on a flat road

Correct answer: A stretched rubber band being released to fly across a room

Elastic potential energy is the energy stored in an object when it is stretched or compressed. A stretched rubber band has stored elastic potential energy. When it is released, this stored energy is converted into kinetic energy, the energy of motion, causing the rubber band to move.

Question 16: 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?

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

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

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.
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)

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

Matter flows in one direction, while energy is recycled.
Energy is created by producers, while matter is created by consumers.
Matter and energy are both fully recycled by decomposers.
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 19: According to the most widely accepted scientific theory, how did the planets in our solar system form?

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 ejected as large molten masses directly from the surface of the Sun.
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 20: The Doppler effect describes:

The increase in wave amplitude as a source approaches
The decrease in wave speed as a source moves away
The apparent change in frequency of a wave due to relative motion between the source and observer (Correct answer)
The bending of waves around obstacles

Correct answer: The apparent change in frequency of a wave due to relative motion between the source and observer

The Doppler effect is the perceived shift in frequency (and therefore pitch or color) of a wave when the source and observer are moving relative to each other.

Question 21: 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 Earth must be positioned directly between the Sun and the Moon.
The Sun, Earth, and Moon must form a right angle.

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 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 are much larger and less dense than the outer planets.
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 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: Which color of visible light has the longest wavelength?

Violet
Blue
Green
Red (Correct answer)

Correct answer: Red

Red light has the longest wavelength (approximately 620–750 nm) of all colors in the visible spectrum, meaning it also has the lowest frequency among visible colors.

Question 24: Besides carbon dioxide, methane (CH₄) is another powerful greenhouse gas. Which of the following human activities is a major source of atmospheric methane?

Livestock farming and the decomposition of waste in landfills. (Correct answer)
The manufacturing of cement and concrete.
The process of splitting atoms in nuclear power plants.
The use of nitrogen-based fertilizers on farmland.

Correct answer: Livestock farming and the decomposition of waste in landfills.

Major human-related sources of methane include agriculture and waste management. Methane is produced by the digestive processes of livestock (like cattle) and is also released when organic matter decomposes in oxygen-poor environments, such as landfills.

Question 25: Scientists analyze air bubbles trapped deep within Antarctic ice cores. They find that over the past 800,000 years, atmospheric CO₂ levels and global temperatures have consistently risen and fallen together. What is the most logical conclusion that can be drawn from this strong correlation?

Volcanic activity has ceased to be a factor in climate during this period.
Atmospheric carbon dioxide concentration is a critical factor in regulating Earth's temperature. (Correct answer)
Changes in Earth's orbit are the only factor that influences long-term climate.
The amount of ice on Earth's surface directly controls the amount of CO₂ in the atmosphere.

Correct answer: Atmospheric carbon dioxide concentration is a critical factor in regulating Earth's temperature.

The consistent, repeating pattern found in ice core data shows a strong coupling between atmospheric CO₂ and global temperature. While orbital cycles can initiate warming or cooling, the resulting change in CO₂ acts as a powerful feedback that amplifies the temperature change, demonstrating that CO₂ is a principal control knob for Earth's climate.

Question 26: Sound waves traveling through air are best classified as which type of wave?

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

Correct answer: Longitudinal waves

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

Question 27: What is the volume of a cube with a side length of 4 units?

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

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 28: During the carbon cycle, plants and algae absorb carbon dioxide to use in photosynthesis. This process represents a transfer of carbon primarily from the:

geosphere to the hydrosphere.
hydrosphere to the geosphere.
biosphere to the atmosphere.
atmosphere to the biosphere. (Correct answer)

Correct answer: atmosphere to the biosphere.

Photosynthesis is the key process where living organisms (biosphere) take in carbon dioxide gas from the air (atmosphere) to create organic compounds, effectively moving carbon from the atmospheric reservoir to the biological one.

Question 29: 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 30: 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
A physical change
An endothermic reaction (Correct answer)
A combustion reaction

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 31: A new drug is developed that specifically targets and disables the mitochondria within a cell. What essential cellular process would be most directly inhibited by this drug?

Photosynthesis
Cellular respiration (Correct answer)
Protein synthesis
DNA replication

Correct answer: Cellular respiration

Mitochondria are known as the 'powerhouses' of the cell because they are the primary site of cellular respiration. This process converts glucose and oxygen into ATP (adenosine triphosphate), the main energy currency for most cellular functions. Disabling mitochondria would halt this energy production.

Question 32: Which region of the electromagnetic spectrum carries the most energy per photon?

Gamma rays (Correct answer)
Infrared radiation
Visible light
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 33: 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 .

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

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.

Question 34: Solve for x in the equation 3 (x − 2) = 15.

7 (Correct answer)
8
6
5

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 35: 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?

Betrayal
Love
Friendship
Courage (Correct answer)

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 36: 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?

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

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 37: What wave property determines the pitch of a sound?

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

Correct answer: Frequency

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

Question 38: If x = 7, what is the value of 2x − 3?

11 (Correct answer)
10
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 39: A strain of bacteria becomes resistant to a common antibiotic. A doctor continues to prescribe the same antibiotic to infected patients. How does this situation illustrate the process of natural selection?

The non-resistant bacteria evolve into resistant bacteria within a single generation.
The antibiotic acts as a selective pressure, favoring the survival and reproduction of resistant bacteria. (Correct answer)
The antibiotic causes new mutations in the bacteria, making them resistant.
The bacteria learn to tolerate the antibiotic and pass this tolerance to their offspring.

Correct answer: The antibiotic acts as a selective pressure, favoring the survival and reproduction of resistant bacteria.

The antibiotic does not cause the resistance mutation; the variation already exists in the bacterial population. The presence of the antibiotic creates a strong selective pressure where resistant bacteria have a significant survival advantage. They survive the treatment and reproduce, passing the resistance genes to the next generation, leading to a population dominated by resistant bacteria.

Question 40: 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?

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.
An increase in atmospheric oxygen levels from the burning of plant matter.
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 41: In a world ravaged by environmental disasters, humanity struggles to survive against the forces of nature. With resources dwindling and cities in ruins, individuals must band together to rebuild society from the ashes. What is the central conflict in the passage?

Man vs. society
Man vs. machine
Man vs. self
Man vs. nature (Correct answer)

Correct answer: Man vs. nature

Explanation: The central conflict in the passage revolves around humanity's struggle to survive against environmental disasters, indicating a conflict between humans and the forces of nature.

Question 42: What is diffraction?

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

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

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

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 44: In his speech, the president addressed the nation with a solemn tone, acknowledging the challenges ahead and urging unity in the face of adversity. What is the author's tone in this passage?

Informative
Humorous
Sarcastic
Serious (Correct answer)

Correct answer: Serious

Explanation: The author's tone is serious as they discuss the challenges facing the nation and urge unity in the face of adversity, conveying a sense of importance and gravity in the speech.

Question 45: Which statement best explains why electromagnetic waves can travel through the vacuum of space but sound waves cannot?

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)
Electromagnetic waves travel faster than sound, allowing them to cross empty space
Sound waves have too low a frequency to travel through a vacuum
Sound waves lose energy quickly while electromagnetic waves do not

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 46: 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?

0.0225 N
9 N (Correct answer)
44.4 N
20.45 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 47: 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 satellite orbiting Earth at a constant speed. (Correct answer)
A car driving in a straight line at a constant 60 mph.
A book resting motionless on a tabletop.

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

12
14 (Correct answer)
13
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 49: What happens to the speed of light when it passes from air into water?

It increases because water has a lower refractive index than air
It remains the same in all transparent media
It decreases because water is denser (Correct answer)
It increases because water is denser

Correct answer: It decreases because water is denser

Light slows down when entering a denser medium like water because the index of refraction of water is greater than that of air.

Question 50: 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"?

Biodegradable
Man-made (Correct answer)
Natural
Organic

Correct answer: Man-made

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

Question 51: 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 significant increase in the ocean's average temperature.
A decrease in the average salinity of the ocean's surface waters.
A rapid increase in dissolved oxygen levels, benefiting most fish.
Increased ocean acidity, which harms marine organisms with shells. (Correct answer)

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

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

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 53: If a rectangle has a length of 10 units and a width of 4 units, what is its area?

30 square units
24 square units
40 square units (Correct answer)
20 square units

Correct answer: 40 square units

Explanation: To find the area of a rectangle, multiply its length by its width. Given: Length = 10 units Width = 4 units Area = Length × Width = 10 units × 4 units = 40 square units

Question 54: A student uses a battery-powered flashlight to see in a dark room. Which of the following describes the primary energy conversions that take place?

Radiant energy to chemical energy to electrical energy
Kinetic energy to electrical energy to light energy
Chemical energy to electrical energy to light and thermal energy (Correct answer)
Electrical energy to thermal energy to light energy

Correct answer: Chemical energy to electrical energy to light and thermal energy

The batteries in a flashlight store chemical potential energy. When the flashlight is turned on, this chemical energy is converted into electrical energy, which flows through the circuit. The bulb then converts the electrical energy into radiant (light) energy and thermal (heat) energy.

Question 55: An observer on Earth sees a full moon. Approximately one week later, which lunar phase will the observer most likely see?

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

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

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50%

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