Practice Test 7 - 4th Grade Science
20 questions. Answer them in any order, then submit to see your score and every explanation.
- When a bird sees a hawk, what role does the brain play in flying away?
- Yuki and Jamal must communicate 8 different messages during a science lab. Solution A uses 2 flashlight blinks (short-short, short-long, long-short, long-long) for 4 messages. Solution B uses 3 flashlight blinks (like short-short-short through long-long-long) for up to 8 messages. Based on number of messages, which solution should be chosen?
- Looking at these patterns, how does changing a code pattern change the information?
- In an older rock layer, Sofia found palm leaf and fern fossils; in newer layers, she found conifer needles. Based on the fossil evidence, what can you infer?
- Sofia learns oil is pumped underground, refined into gasoline, and used in cars. According to this information, what do humans use energy from oil for?
- The same darkness arrives at night. An owl becomes active, a chicken goes to sleep, and a human turns on lights. Why?
- Comparing two sound waves, one is louder and has crests farther apart; which is accurate?
- Sofia reads by sunlight: first light comes from the Sun, then it goes through a window, next it hits her book, and finally it bounces to her eyes. Trace the energy: what is the correct order of steps?
- In this formation, which layer is the youngest, and what pattern shows it?
- The same cold winter air arrives. A bird flies south, a bear hibernates, and a rabbit grows thicker fur. Why?
- Marcus tested a motion-powered light that converts cranking motion to electrical energy. When he cranked, the LED was bright, but it went out in 1 second after he stopped; the goal was 20 seconds. The results show the device does not store energy. Based on the testing, what modification would help meet the goal?
- When a wildfire burns near Keisha's town, what can result for people and communities?
- In a flower, how do petals help the plant reproduce and make seeds?
- In this model, trace the pathway from a cat seeing a mouse to pouncing; what is the order?
- Fatima compares two rocks: one has orange stains and tiny pits, and the other looks fresh. Over many years, what evidence shows chemical weathering occurred?
- How can a volcanic eruption affect people living near the volcano and their activities?
- Diego checks a beach cliff: storm waves undercut 9 cm in one night, but calm waves undercut 1 cm. What is the effect of a high erosion rate on the landscape?
- Looking at these rock layers, what pattern shows water energy changed over time?
- Yuki rolls a fast toy car into a soft foam block on a rough carpet; what will happen after collision?
- Emma is at the top of a slide moving very slowly, but she will speed up going down. When she speeds up, what will happen to her kinetic energy?