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Practice Test 3 - 3rd Grade Science

20 questions. Answer them in any order, then submit to see your score and every explanation.

  1. Two magnets are 5 cm apart, not touching, and one slides away. What causes this?​
  2. A magnet near an aluminum can does nothing, but near a steel can it pulls strongly. Which change causes the effect?
  3. In Ohio during spring, this table shows average temperatures: March high 48°F low 32°F, April high 62°F low 42°F, May high 73°F low 53°F. Based on the data, what pattern do you see?
  4. A graph compares August and October weather: August avg 85°F with 25 sunny days and 6 rain days; October avg 58°F with 15 sunny days and 16 cloudy/rainy days, plus first frost. Which statement best describes the typical pattern?​
  5. Dog life cycle model: puppy → young dog → adult dog → has puppies → old dog. What comes after adult?
  6. In the ocean with salty water and waves, which organism is best suited to survive?
  7. Students want shade on the playground. The school needs shade within 1 year, under $300, and lasting at least 3 years. Idea A is planting a tree for $100, but it takes 5 years to give shade. Idea B is a big umbrella for $200 and it lasts 2-3 years. Idea C is a shade sail for $400 and it lasts 10 years. According to the information given, which solution would work best?
  8. Chen's class observed a desert habitat: it is hot and dry, about 110°F each day, with one rainstorm per month. In 4 weeks, cactus plants increased from 40 to 55 and made flowers (thriving). Camels stayed at 12 and looked healthy (stable). After 2 weeks, no rainforest frogs were found (cannot survive). Based on the evidence, what explains why some organisms survive well and others cannot?
  9. Bean plant: seed→sprout→plant→flowers→seeds. Butterfly: egg→caterpillar→chrysalis→adult. How is the bean plant different?
  10. Many different leaf fossils are in the same rock layer; what can we conclude?
  11. Amir compared 2 tomato plants from cuttings of the same parent plant. Both got the same sunlight, but different water. Data: 6 cups/week = 16 tomatoes; 2 cups/week = 5 tomatoes. Based on the data, what evidence shows that water affects the number of tomatoes?
  12. A small magnet picked up 44 paperclips and a large magnet picked up 1515; why is the large stronger?
  13. To collect weather data in Michigan during fall, how can students collect accurate data?​
  14. Two balloons rubbed on hair move apart while 4 cm apart. Why?
  15. Ant: egg→larva→pupa→adult→eggs; Turtle: egg→hatchling→adult→lays eggs; Pine tree: seed→seedling→tree→makes seeds. What pattern do all these organisms share in their life cycles?
  16. A bean plant model shows seed → seedling → plant → flower → seeds. What comes next?​
  17. New York (40°N) has winter Dec–Feb with 20–40°F and snow, and summer Jun–Aug with 75–85°F. Melbourne (38°S) has winter Jun–Aug with 45–58°F and summer Dec–Feb with 65–80°F. What is a major difference?
  18. A school needs a bike rack for 20 bikes. It must cost under $150 and be sturdy. Design A holds 20 bikes, costs $200, and is very sturdy but needs concrete. Design B holds 12 bikes, costs $80, and bolts to a wall. Design C holds 20 bikes, costs $40, but tips over when bumped. Which option should the school choose?
  19. Look at the test results. The class tested 3 cups to keep ice water cold for 30 minutes. Cup A had no wrap and warmed from 32°F to 55°F, and the ice melted all the way. Cup B had newspaper and warmed to 40°F, with half the ice left. Cup C had bubble wrap and warmed to 34°F, with almost all the ice left. What should students change based on what the test showed?
  20. In a hot, dry desert with little water, which organism survives well?

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