Grade 5 Science: 10 Free Practice Questions

Answer: Elastic potential energy
A stretched rubber band stores elastic potential energy due to its deformed shape, and this stored energy converts into kinetic energy, the energy of motion, when the band is released and snaps back to its original shape. Kinetic energy describes the energy of motion once released, not the energy stored while stretched, and thermal and electrical energy are unrelated to the mechanical stretching of a rubber band.

Answer: A trade-off, in which improving one design criterion may come at the expense of another
This scenario illustrates a trade-off, a common challenge in engineering design where improving one criterion, such as protection, may require sacrificing another, such as weight, requiring the engineer to balance competing priorities. This is not an unsolvable situation, since engineers routinely navigate such trade-offs, safety remains a central concern in the decision, and weight and protection are shown to be related, not unrelated, properties in this context.

Answer: shows multiple interconnected feeding relationships among many organisms
A food web combines many overlapping food chains to show the variety of feeding relationships in an ecosystem, while a single food chain shows only one linear energy path.

Answer: The movement of weathered rock and soil from one place to another
Erosion is the process by which weathered rock and soil particles are transported from one location to another by agents such as wind, water, or ice.

Answer: It was a physical change because the chocolate can return to its original state
A key indicator of a physical change is that it is often reversible; the chocolate can be melted and re-solidified without becoming a different substance. Heat alone does not indicate a chemical change, since melting also involves heat but is physical.

Answer: The sun
The sun's heat energy warms surface water, causing it to change from liquid to water vapor in the process of evaporation.

Answer: The bottom layer is generally the oldest, and each successive layer above it is progressively younger
According to the principle of superposition, in an undisturbed sequence of sedimentary rock layers, the oldest layers are found at the bottom, since they were deposited first, while progressively younger layers are deposited on top of them over time. The top layer would be the youngest, not the oldest, the layers did not all form simultaneously, since sediment accumulates gradually, and relative position is in fact a scientifically valid method for estimating a layer's relative age.

Answer: Earth's axis remains tilted in the same direction as it orbits the sun, changing the angle of sunlight received
Earth's axis stays tilted at a constant angle (about 23.5 degrees) pointing in the same direction in space as Earth orbits the sun. This causes the angle and duration of sunlight reaching New York to change throughout the year, producing the four seasons.

Answer: Introducing a new species can have unintended and harmful consequences on native species that did not evolve alongside the newcomer
This scenario illustrates that intentionally introducing a new species into an ecosystem, even with good intentions such as pest control, can have unintended and harmful consequences for native species that did not evolve defenses against this new threat, which is a well-documented risk of introducing non-native organisms. In this case, the introduced predator caused unintended harm rather than successfully controlling only the intended pest, native species do not always have effective defenses against unfamiliar predators, as shown by the declining bird population, and ecosystems clearly can be significantly affected by the introduction of new species.

Answer: A rock, because it has mass and takes up space
Matter is defined as anything that has mass and takes up space, or volume, which describes a rock. Sound, shadows, and heat are all forms of energy or the absence of light rather than physical substances with mass and volume, so they do not fit the definition of matter.