Grade 5 Science Practice Test

Properties of Matter

All matter has properties that can be observed and measured. Physical properties can be detected without changing the substance — color, shape, texture, mass, volume, density, melting point, and boiling point are all physical properties. Density describes how much mass is packed into a given volume (density = mass ÷ volume). Objects that are less dense than water float; objects that are denser sink. Chemical properties describe how a substance reacts with other substances. For example, iron rusts when exposed to oxygen and water — rusting is a chemical change because a new substance (iron oxide) is formed. Burning wood is also a chemical change — the wood becomes ash, carbon dioxide, and water vapor. Physical changes, such as cutting paper or melting ice, do not produce new substances; the material keeps the same chemical makeup.

1. What is the difference between a physical property and a chemical property?

A) Physical properties can only be measured in a laboratory; chemical properties can be observed anywhere. B) Physical properties can be observed without changing the substance; chemical properties describe how it reacts with other substances. C) Physical properties include color and smell; chemical properties include size and shape. D) There is no difference — both describe the same characteristics of matter.

2. A block of wood has a mass of 20 g and a volume of 40 cm³. What is its density?

A) 0.25 g/cm³ B) 0.5 g/cm³ C) 2.0 g/cm³ D) 800 g/cm³

3. Which of the following is an example of a chemical change?

A) Melting butter in a pan B) Cutting a piece of paper C) Dissolving sugar in water D) Iron rusting when exposed to oxygen and water

4. Why does a wood block float in water?

A) Wood repels water due to its chemical properties. B) Wood is less dense than water. C) Wood absorbs water, which makes it rise to the surface. D) Wood has no mass, so gravity cannot pull it down.

Question 5. 1-credit Explain how you could determine whether a change to a substance is physical or chemical.

Natural Selection and Extinction

Natural selection is the process by which organisms with traits that help them survive in their environment are more likely to reproduce and pass those traits to offspring. Over many generations, these favorable traits become more common in the population. Charles Darwin observed this process in the 1800s and published his findings in "On the Origin of Species." Natural selection acts on variation — individuals within a population are not identical. Those with variations that are better suited to their environment survive more often. When an environment changes rapidly and a population cannot adapt quickly enough, the species may become extinct — no longer existing anywhere on Earth. Extinction can also be caused by habitat loss, disease, hunting, or competition from other species. The fossil record provides evidence of extinct species and shows how life on Earth has changed over millions of years.

6. What is natural selection?

A) The process by which scientists choose which species to protect B) The process by which organisms with helpful traits are more likely to survive and reproduce C) The method by which organisms change their traits during their lifetime D) The random appearance of new traits in individual organisms

7. Why is variation within a population important for natural selection?

A) It allows every individual in a population to survive equally. B) Without variation, all individuals would look exactly the same, making the species less interesting. C) Variation provides the differences that natural selection acts on — some variations help survival more than others. D) Variation ensures that predators cannot identify prey as easily.

8. What can cause a species to become extinct?

A) Reproducing too rapidly for the environment to support B) Developing too many favorable adaptations over time C) Rapid environmental change that the population cannot adapt to quickly enough D) Migrating to a new environment with fewer predators

9. What does the fossil record provide evidence of?

A) The locations where all current species originated B) Extinct species and how life on Earth has changed over millions of years C) The exact causes of mass extinction events D) Which species will survive future environmental changes

Question 10. 1-credit Explain how natural selection can cause a population to change over many generations.

Electricity and Circuits

Electricity is the flow of electric charges (electrons) through a conductor such as a wire. For electricity to flow, it needs a complete path called a circuit. A simple circuit includes an energy source (such as a battery), conductors (wires), and a load (such as a light bulb). If the circuit is broken — by a switch being turned off or a wire being disconnected — the current stops and the bulb goes dark. There are two types of circuits. In a series circuit, all components are connected in a single loop. If one component fails, the entire circuit breaks. In a parallel circuit, components are connected in separate branches, so if one component fails, the others continue to work. The electricity in homes is wired in parallel, which is why turning off one light switch does not turn off all the lights in the house.

11. What is required for electric current to flow through a circuit?

A) A battery, at least two conductors, and an open switch B) A complete, unbroken path from the energy source through the load and back C) High voltage from multiple batteries connected together D) A resistor to slow down the current to safe levels

12. What happens in a series circuit if one light bulb burns out?

A) Only that bulb goes out; all others continue to work. B) The circuit reroutes the current around the broken bulb. C) All bulbs in the circuit go out because the circuit is broken. D) The battery compensates by sending more current to the remaining bulbs.

13. Why are homes wired with parallel circuits rather than series circuits?

A) Parallel circuits are cheaper to install than series circuits. B) Parallel circuits prevent electrical fires, while series circuits cause them. C) In a parallel circuit, each component can work independently — one failure does not affect others. D) Series circuits cannot carry enough current to power household appliances.

14. What is the role of an energy source (such as a battery) in a circuit?

A) It stores excess electrical energy after the circuit is complete. B) It provides the electrical energy that pushes current through the circuit. C) It slows down current so that bulbs do not burn out quickly. D) It converts mechanical energy from the wires into electrical energy.

Question 15. 1-credit Explain the difference between a series circuit and a parallel circuit. Which type is more useful for wiring a home, and why?

Sound and Light Waves

Sound and light are both types of waves that carry energy, but they behave differently. Sound is a mechanical wave — it requires matter to travel through. Sound travels through air, water, and solid materials by compressing and expanding the particles of the medium. It cannot travel through the vacuum of space. Light is an electromagnetic wave — it does not require matter and can travel through the vacuum of space. Light travels much faster than sound: about 186,000 miles per second compared to about 767 miles per hour for sound in air. This is why you see lightning before you hear thunder — both occur at the same time, but light reaches you nearly instantly while sound takes about 5 seconds to travel each mile. Both sound and light can be reflected, absorbed, and refracted (bent as they pass through different materials).

16. Why can light travel through space but sound cannot?

A) Light is faster than sound and does not need a medium. B) Light is an electromagnetic wave that does not require matter; sound requires matter to travel through. C) Sound is blocked by gravity in space; light is not affected by gravity. D) Space is too cold for sound waves to form, but light generates its own heat.

17. Why do you see lightning before you hear thunder?

A) Lightning is created before thunder during a storm. B) Thunder is produced after lightning and travels more slowly. C) Both occur at the same time, but light reaches you nearly instantly while sound travels much slower. D) Your eyes detect light faster than your ears detect sound.

18. How does sound travel through air?

A) Sound particles fly through the air at high speed. B) Sound compresses and expands air particles in a wave that moves outward. C) Sound heats the air, causing it to rise and carry the sound upward. D) Sound travels in the spaces between air molecules without touching them.

19. Which of the following do sound and light waves have in common?

A) Both require matter to travel through. B) Both travel at the same speed. C) Both can be reflected and absorbed. D) Both are types of mechanical waves.

Question 20. 1-credit Explain why an astronaut in space cannot hear an explosion happening nearby.

Fossils and Geological Time

Fossils are the preserved remains or traces of organisms that lived long ago. They form when an organism is buried quickly after death — often in sediment — before it can decompose. Over time, minerals replace the organic materials, creating a stone-like replica. Trace fossils — footprints, burrows, or other marks — show how organisms moved or behaved. The fossil record provides evidence of how life has changed over billions of years. Earth's history is organized into a geological time scale that divides time into eons, eras, and periods. The Paleozoic Era saw the rise of fish, amphibians, and early reptiles. The Mesozoic Era is known as the "Age of Dinosaurs." The Cenozoic Era, which continues today, saw the rise of mammals and eventually humans. Index fossils — fossils of organisms that existed only during a specific time period — help scientists date the rock layers in which they are found.

21. How do most fossils form?

A) Organisms are frozen in ice and preserved for millions of years. B) Organisms are buried quickly in sediment, where minerals replace their organic materials. C) Dead organisms are carried to volcanic areas where heat turns them to stone. D) Organisms are pressed between layers of granite and preserved by pressure.

22. What is a trace fossil?

A) A partial fossil that is missing significant parts of the organism B) A fossil found only in rock layers near Earth's surface C) Preserved evidence of an organism's behavior, such as footprints or burrows D) A fossil of a very small organism, such as a bacterium

23. Which geological era is known as the "Age of Dinosaurs"?

A) The Paleozoic Era B) The Mesozoic Era C) The Cenozoic Era D) The Precambrian Era

24. How do index fossils help scientists?

A) They show what the climate was like during different time periods. B) They allow scientists to date the rock layers in which they are found. C) They provide DNA samples used to recreate extinct species. D) They mark the exact boundaries between continents on ancient maps.

Question 25. 1-credit Explain what the fossil record tells scientists about Earth's past.

Soil and Agriculture

Soil is not just dirt — it is a complex mixture of minerals, water, air, organic matter, and living organisms. Healthy soil takes centuries to form. It develops as rock weathers into small particles, and as dead organisms decompose and enrich the soil with nutrients. The upper layer of soil, called topsoil, is the most fertile and is where most plant roots grow. Below the topsoil is subsoil, which contains fewer nutrients and organisms. Soil is essential to agriculture — the growing of food crops. Different crops require different soil conditions. Farmers improve soil health through composting (adding organic matter), crop rotation (alternating crops to restore nutrients), and avoiding overuse of chemical fertilizers that can harm soil organisms. Erosion — the washing or blowing away of topsoil — is a major agricultural concern, since it removes the most fertile layer.

26. What makes topsoil the most important layer for plant growth?

A) It contains the most water compared to deeper soil layers. B) It is closest to the surface where sunlight can warm it. C) It is the most fertile layer, richest in nutrients and organisms, where most roots grow. D) It contains the densest rock particles that support roots best.

27. How does crop rotation benefit soil health?

A) It prevents weeds from growing between rows of crops. B) It allows topsoil to harden between planting seasons. C) Alternating crops helps restore nutrients that previous crops removed from the soil. D) It reduces the amount of water crops need by spreading roots more evenly.

28. Why is erosion a serious concern for farmers?

A) It causes rock layers beneath fields to shift, damaging equipment. B) It washes away topsoil, removing the most fertile layer needed for crop growth. C) It introduces invasive species that compete with crops for nutrients. D) It allows subsoil to rise to the surface, making the land too rocky to plow.

29. What does composting add to soil?

A) Mineral particles from ground-up rock B) Organic matter that enriches the soil with nutrients C) Chemical fertilizers that speed up plant growth D) Air pockets that allow plant roots to grow deeper

Question 30. 1-credit Explain why healthy soil takes a long time to form.

Space Exploration and Technology

Space exploration has expanded our understanding of Earth and the universe. Satellites orbit Earth, providing weather forecasts, GPS navigation, and communications. Space telescopes like the Hubble Space Telescope can observe distant galaxies without interference from Earth's atmosphere. Robotic rovers like Curiosity and Perseverance have explored the surface of Mars, sending back data about its geology, atmosphere, and potential for past life. The International Space Station (ISS) is a research laboratory where astronauts from multiple countries study the effects of long-duration spaceflight on the human body, grow plants in microgravity, and conduct experiments in physics, biology, and materials science. Space exploration has also driven technological innovations with applications on Earth, including memory foam, water purification systems, scratch-resistant lenses, and advances in medical imaging.

31. What is one advantage of space telescopes over ground-based telescopes?

A) Space telescopes are much larger and can see more of the sky at once. B) Space telescopes can observe without interference from Earth's atmosphere. C) Space telescopes are closer to the objects they observe. D) Space telescopes can detect gravity waves that ground telescopes cannot.

32. What is one scientific goal of Mars rover missions?

A) To return Martian rock samples to museums on Earth B) To prepare Mars for eventual human colonies C) To study Mars's geology, atmosphere, and potential for past life D) To test communication equipment for future manned missions to Jupiter

33. What is the International Space Station primarily used for?

A) Military surveillance of countries below its orbit B) Research into the effects of spaceflight and experiments in multiple scientific fields C) Launching rockets to other planets in the solar system D) Storing supplies for future lunar missions

34. How has space exploration benefited life on Earth?

A) It has provided a new source of rare minerals mined from asteroids. B) Technologies developed for space use have found applications in everyday life on Earth. C) It has solved the problem of overpopulation by relocating people to space stations. D) Space exploration has had no practical benefits for life on Earth.

Question 35. 1-credit Describe one way that technology developed for space exploration has been used to improve life on Earth.

The Nitrogen Cycle

Nitrogen makes up about 78 percent of Earth's atmosphere, but most living organisms cannot use nitrogen gas directly. The nitrogen cycle describes how nitrogen moves from the atmosphere into living things and back. Certain bacteria in soil can perform nitrogen fixation — converting nitrogen gas (N₂) into ammonia or nitrates that plants can absorb. Plants use this nitrogen to build proteins. Animals get nitrogen by eating plants or other animals. When organisms die, decomposers break down the nitrogen compounds in their bodies and return nitrogen to the soil or atmosphere. Some bacteria perform denitrification — converting nitrates back into nitrogen gas that returns to the atmosphere. Human activities have disrupted the nitrogen cycle. Excess nitrogen from fertilizers can wash into waterways, causing algae to grow rapidly, deplete oxygen, and create "dead zones" where fish cannot survive.

36. Why can't most living organisms use atmospheric nitrogen gas directly?

A) Nitrogen gas is toxic to most living cells. B) Most organisms lack the biological tools to convert nitrogen gas into usable forms. C) Nitrogen gas only exists in very small amounts in the atmosphere. D) Nitrogen gas dissolves in water before organisms can absorb it.

37. What role do nitrogen-fixing bacteria play in the nitrogen cycle?

A) They break down dead organisms and release nitrogen back to the atmosphere. B) They convert nitrogen gas from the air into forms that plants can absorb. C) They carry nitrogen from plant roots to animal consumers. D) They convert nitrogen in fertilizers into a form plants can store as starch.

38. What is denitrification?

A) The process by which plants absorb nitrogen from the soil B) The process by which decomposers break down proteins in dead organisms C) The conversion of nitrates back into nitrogen gas that returns to the atmosphere D) The removal of nitrogen from agricultural soil by growing crops

39. How can excess fertilizer harm aquatic ecosystems?

A) It kills fish directly by poisoning the water they drink. B) It causes algae to grow rapidly, depleting oxygen and creating dead zones. C) It makes the water too acidic for most aquatic plants to survive. D) It attracts invasive species that compete with native fish.

Question 40. 1-credit Explain why nitrogen-fixing bacteria are essential to most ecosystems.

Grade 5 Science Practice Test — Version D