Practice Test 10 - 4th Grade Science
20 questions. Answer them in any order, then submit to see your score and every explanation.
- Two waves are shown; which wave has the longer wavelength?
- Maya looks at her face in a mirror with the bathroom light on. What must happen for her to see herself?
- Between coal electricity and solar electricity, which has a higher climate impact from emissions?
- Diego's town is near a volcano, and ash can make breathing hard and close roads; what solution reduces impacts?
- Chen flips on a flashlight: first the battery sends energy to the bulb, then light reaches the wall. What is the pathway of energy transfer from start to finish?
- In a toy car race, Sofia's car zooms down the ramp in 3 s, and Chen's car rolls down in 9 s. Based on the scenario, which car has more kinetic energy?
- Chen turns on a flashlight and points it at a wall. The bright spot appears on the wall, and when he covers the flashlight, the spot disappears. In this observation, which type of energy is being transferred?
- Jamal tested a hand-crank flashlight that converts motion to light. After cranking for 20 seconds, the light was dim and lasted only 6 seconds, but the goal was 30 seconds. The results showed the light fades quickly after cranking stops. Based on the testing, what change would help it work longer?
- Comparing coal electricity and solar electricity, which choice makes more air pollution in the sky?
- Jamal is riding his bike fast and has a lot of kinetic energy. He will squeeze the brakes until the bike stops. When the bike stops moving, its kinetic energy will ___.
- For this design challenge, Marcus must build a mini lift that uses a motor to raise a 10-gram washer 10 cm by converting electrical energy to motion energy using a battery pack, motor, string, and a switch. How should the device be designed to convert energy effectively?
- Which example best supports the argument that owl ears help owls locate prey in the dark?
- Keisha finds marine reptile bones in lower layers, but the upper layers contain fossils of cactus plants. Based on these fossils, what can you infer about the environment change over time?
- When oil is drilled from the ground, how can this affect nearby wildlife habitats?
- Yuki stands near a drum while it is quiet, and a tiny piece of rice on the drumhead is still. When the drum is hit, sound waves and vibrations reach the drumhead. The rice jumps and shakes on the drumhead. In this example, how do the waves cause the rice to move?
- In Frost Valley, a lower layer has unsorted rocks (till) and scratches on bedrock, plus fossils of cold-weather animals; above it are soils with warm-weather plant fossils. Using the rock and fossil evidence, explain how this landscape changed over time.
- Comparing a bee's mouthparts and a hummingbird's beak, how are they similar in function?
- To solve this communication problem, Maya and Chen need silent signals for "bathroom," "water," and "help" across the room. Which pattern-based solution would best transfer this information?
- Maya compares a steep slope and a gentle slope after the same rain. The steep slope forms a 9 cm gully in 4 days, but the gentle slope forms a 2 cm gully in 4 days. Which statement correctly describes how erosion rate affects changes?
- In this model, trace the pathway: cat sees a mouse → eyes → ___ → brain → ___ → legs → pounce.