| 1. |
What
type of line carries sound waves best? |
21. |
Which
way does the wind blow most frequently? |
| 2. |
Can the
sun's energy be used to clean water? |
22. |
Does
the size of a light bulb affect its energy use? |
| 3. |
Does a
green plant add oxygen to its environment? |
23. |
For how
long a distance can speech be transmitted through a tube? |
| 4. |
Which
metal conducts heat best? |
24. |
Which
grows mold faster --moist bread or dry bread? |
| 5. |
What
percentage of corn seeds in a package will germinate? |
25. |
What
type of soil filters water best? |
| 6. |
Does an
earthworm react to light and darkness? |
26. |
Does
the color of a material affect its absorption of heat? |
| 7. |
Does
the human tongue have definite areas for certain tastes? |
27. |
Does
sound travel best through solids, liquids, or gases? |
| 8. |
Can
same type balloons withstand the same amount of pressure? |
28. |
Do
sugar crystals grow faster in tap water or distilled water? |
| 9. |
Does
the viscosity of a liquid affect its boiling point? |
29. |
Can you
see better if you limit the light that gets to your eye? |
| 10. |
Does
surrounding color affect an insect's eating habits? |
30. |
How
much of an apple is water? |
| 11. |
Do
children's heart rates increase as they get older? |
31. |
What
common liquids are acid, base, or neutral? |
| 12. |
Can you
use a strand of human hair to measure air moisture? |
32. |
Do
taller people run faster than shorter people? |
| 13. |
What
materials provide the best insulation? |
33. |
Does
the length of a vibrating object affect sound? |
| 14. |
Is
using two eyes to judge distance more accurate than using one
eye? |
34. |
Does a
plant need some darkness to grow? |
| 15. |
Do
different kinds of caterpillars eat different amounts of food? |
35. |
Who can
balance better on the balls of their feet -- boys or girls? |
| 16. |
What
plan foods contain starch? |
36. |
Does
exercise affect heart rate? |
| 17. |
What
keeps things colder -- plastic wrap or aluminum foil? |
37. |
Which
dish soap makes the longest lasting suds? |
| 18. |
Does
heart rate increase with increasing sound volume? |
38. |
What
are the effects of chlorine on plant growth? |
| 19. |
Do boys
or girls have a higher resting heart rate? |
39. |
Which
type of oil has the greatest density? |
| 20. |
Do
liquids cool as they evaporate? |
40. |
How
accurately do people judge temperatures? |
