Compare Solutions with Criteria - 4th Grade Science

1. What should you do if no solution meets all constraints?

   Redesign or revise the solutions or constraints. Modify the problem when no existing solution works.

2. What tool is most useful to compare several solutions against the same criteria?

   A comparison table or checklist. Organizes criteria for systematic side-by-side evaluation.

3. Identify the correct statement: A solution can break constraints if it meets criteria very well.

   Incorrect; a solution must meet all constraints. Constraints are mandatory; breaking them disqualifies a solution.

4. Which solution is most effective if all meet constraints and you prioritize safety over cost?

   Choose the solution with the highest safety rating. When prioritizing, select based on the most important criterion.

5. Which solution is most effective if the constraint is "mass must be under $200$ g": $180$ g or $240$ g?

   $180$ g. $180 < 200$, so it meets the constraint; $240 > 200$ fails.

6. What is the meaning of a criterion when comparing two solutions to a problem?

   A standard used to judge how well a solution works. Criteria measure success; constraints set boundaries.

7. What is a constraint when comparing solutions to a problem?

   A limit that solutions must follow, such as time, budget, or materials. Constraints are mandatory requirements that cannot be broken.

8. Which statement is a measurable criterion: "looks nice" or "lasts at least $30$ days"?

   "Lasts at least $30$ days". Measurable criteria use specific numbers or quantities.

9. Which solution is most effective if the constraint is mass must be under $2$ kg: A $1.8$ kg, B $2.1$ kg, C $1.9$ kg?

   Solution A or Solution C. Both A ($1.8$ kg) and C ($1.9$ kg) are under $2$ kg; B exceeds it.

10. Choose the most effective solution if all constraints are met and scores are: A=$7$, B=$9$, C=$8$.

    Solution B. B has the highest score ($9$) among all solutions.

11. Which solution should be rejected immediately: one that meets criteria but breaks a constraint, or one that meets all constraints?

    Reject the solution that breaks a constraint. Constraints are mandatory; breaking one disqualifies the solution.

12. Which option describes effectiveness when comparing solutions: meets goals best or looks nicest?

    Meets goals best. Effectiveness means achieving desired outcomes.

13. What does it mean to trade off when choosing between two solutions?

    Improving one criterion may worsen another. Trade-offs occur when solutions excel in different areas.

14. Which option is the correct meaning of "trade-off" when selecting a solution?

    Gaining one benefit while giving up another. Trade-offs involve sacrificing one advantage for another.

15. What should you do first when comparing two possible solutions to a science problem?

    List the criteria and constraints. Identify requirements before evaluating how well solutions meet them.

16. Which solution best meets the criterion "lowest cost": $6 or $9?

    $6. $\$6 < \$9$, making it the lower-cost option.

17. Which option is the best reason to test a prototype before choosing a final solution?

    To collect evidence about how well it meets criteria. Testing provides data to evaluate criteria performance.

18. Which tool best helps compare several solutions fairly using the same criteria?

    A decision matrix or scoring table. Matrices organize criteria scores for objective comparison.

19. What is the meaning of a constraint when selecting the most effective solution?

    A limit or rule that a solution must follow. Constraints are requirements that cannot be violated.

20. Which solution is most effective if the constraint is volume must be at least $500$ mL: A $450$ mL, B $500$ mL, C $650$ mL?

    Solution B or Solution C. B ($500$ mL) and C ($650$ mL) meet the minimum; A ($450$ mL) doesn't.

21. Choose the word that best completes the sentence: Constraints are ______, not preferences.

    Limits. Constraints are mandatory requirements, not optional.

22. Which option is more effective for the criterion "uses less energy": $15$ J or $20$ J?

    $15$ J. $15 < 20$, using less energy as desired.

23. Which option is a criterion: "must be safe" or "should be lightweight"?

    Should be lightweight. "Should" indicates a preference, making it a criterion.

24. Which step should you do first when comparing solutions using criteria and constraints?

    List the criteria and constraints. Start by defining what to measure and what limits exist.

25. Which option is a criterion: "must cost under $10" or "should be durable"?

    "Should be durable". Criteria express preferences (should), constraints express requirements (must).

26. Which option best describes fair testing when comparing solutions?

    Change one factor and keep other conditions the same. Controls variables to isolate the factor being tested.

27. What does it mean if a solution "meets the constraints" but is not selected?

    It is allowed but not the best at the criteria. Other solutions performed better on the criteria.

28. Which solution is most effective if the only criterion is lowest cost: A costs $5, B costs $3, C costs $4?

    Solution B. $\$3 < \$4 < \$5$, so B has the lowest cost.

29. Which option is a constraint: "must cost under $10" or "should be easy to use"?

    Must cost under $10. "Must" indicates a requirement, making it a constraint.

30. Which solution should you choose if safety is a constraint and Solution A is unsafe while B is safe?

    Solution B. Safety constraints eliminate unsafe options immediately.

31. Which solution is most effective if the constraint is time must be under $10$ min: A $8$ min, B $12$ min, C $9$ min?

    Solution A or Solution C. Both A ($8$ min) and C ($9$ min) are under $10$ min; B exceeds it.

32. Which option is a constraint: "should be lightweight" or "must use only recycled paper"?

    "Must use only recycled paper". "Must" indicates a mandatory requirement, making it a constraint.

33. Which solution is most effective if the criterion is greatest strength: A holds $5$ N, B holds $7$ N, C holds $6$ N?

    Solution B. $7$ N $>$ $6$ N $>$ $5$ N, so B holds the most weight.

34. Find the most effective option if the constraint is "volume must be $\geq 2$ L": $1.5$ L or $2.2$ L.

    $2.2$ L. $2.2 \geq 2$ meets the constraint; $1.5 < 2$ fails.

35. What is a criterion when comparing solutions to a problem?

    A desired feature used to judge solutions, such as cost or speed. Criteria are goals or preferences, not requirements.

36. Which solution is most effective if the criterion is least material used: A uses $12$ cm, B uses $9$ cm, C uses $10$ cm?

    Solution B. $9$ cm $<$ $10$ cm $<$ $12$ cm, so B uses the least.

37. Which solution is best if criteria weights are equal and totals are A=$10$, B=$10$, C=$9$?

    A and B are tied. Equal scores mean both solutions perform equally well.

38. Identify the better solution if the criterion is "highest strength": $8$ N or $12$ N.

    $12$ N. $12 > 8$, so it provides greater strength.

39. Which option should be rejected if the constraint is "length must be $\leq 30$ cm": $29$ cm or $31$ cm?

    $31$ cm. $31 > 30$, violating the constraint; $29 \leq 30$ is acceptable.

40. Identify the best choice if the constraint is "time must be $\leq 5$ min": $4$ min or $6$ min.

    $4$ min. $4 \leq 5$ meets the constraint; $6 > 5$ violates it.

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