Practice Test 8 - 4th Grade Science
20 questions. Answer them in any order, then submit to see your score and every explanation.
- Keisha winds up a wind-up toy, then it moves across the floor. Which transformation occurs?
- For a fish, which structure allows it to breathe underwater for survival?
- Marcus speaks into a microphone. What form of energy is the input for this device?
- In these examples, which pattern represents "go" in the traffic light code?
- Diego studies wind energy and learns that moving air spins turbines to generate electricity. Based on this information, where does the energy for turning on classroom lights come from?
- A town near a fault line wants to reduce earthquake impacts. Solution A uses earthquake-resistant building design (strong materials and flexible frames) to reduce damage, but it is expensive and takes time to build. Solution B is an early warning system that sends alerts seconds before shaking, which is cheaper and faster to set up, but it does not stop buildings from breaking. Solution C is emergency supply kits for families, which are affordable and help after an earthquake, but they do not prevent injuries during shaking. Comparing these solutions using the criterion of effectiveness at reducing building damage, which solution should the town choose?
- During a drought, what impact can happen to farms and a town's water supply?
- Looking at the sidewalk, what evidence shows root wedging weathering happened?
- Floods keep reaching Jamal's street. Solution A: build a levee (very effective, expensive, long time). Solution B: elevate homes (moderate cost per home, helps only raised homes). Solution C: create wetlands (lower cost, needs space, slower). If the town's main constraint is limited budget, which solution is most appropriate?
- Keisha lifts and releases one ball in a Newton's cradle so it swings into the still balls and clicks. Looking at this setup, which question asks about energy changes in this collision?
- For this design challenge, Chen must build a noisemaker for recess using spinning parts; which conversion changes motion energy into sound energy?
- In this energy transfer, first Diego puts a metal spoon in a cup of hot water, then heat moves from the water to the cup, next it moves into the spoon, and finally the spoon handle gets warm. Where does the energy end up?
- Comparing a gasoline car and an electric car, which usually has less tailpipe air pollution?
- The rock layers show fossils changing upward; what pattern indicates time passing?
- Marble lab: Jamal rolled Marble A at 30 cm/s into still Marble B; after, A rolled 10 cm/s and B rolled 18 cm/s. Using the data, describe how energy moved between the objects.
- What role does the brain play when skin feels a sharp pinch and the body moves away?
- Sofia uses a solar calculator in sunlight. What form of energy goes in and comes out?
- A town in "Tornado Alley" wants safer places during tornadoes. Solution A builds an underground shelter, which is very safe but expensive and not possible in some rocky areas. Solution B adds a safe room inside each home, which is also very safe but costs money for each family. Solution C builds a community storm shelter, which can protect many people, but some families may not reach it in time. Based on the criterion of highest safety during a tornado, which solution is best?
- To communicate numbers 1, 2, and 3 across the room, what pattern code should Keisha design with light flashes?
- Across the playground, Sofia and Chen need distance signals for 5 messages. Solution A uses colored flags (red="stop," green="go," blue="come," yellow="spread out," white="huddle"). Solution B uses whistle patterns (1 short="stop," 2 short="go," 1 long="come," long+short="spread out," 3 short="huddle"). Which solution would work best in a noisy playground for clarity?