ACT Science Domain 2: Scientific Investigation Welcome to your ACT Science Domain 2: Scientific Investigation 1. ACT Science: Scientific Investigation A researcher is conducting an experiment on the growth of bacteria in petri dishes. If a petri dish has bacteria that doubles every 2 hours, how many times will the bacteria double in 8 hours? 2 times 3 times 4 times 5 times None 2. ACT Science: Scientific Investigation A scientist studies a new material and notices that its density is influenced by its temperature. Given that density is mass per unit volume, if the temperature is increased, which of the following outcomes would most likely be observed? The mass decreases The volume increases The density remains constant The volume decreases None 3. ACT Science: Scientific Investigation A scientist observes that plants grown under certain conditions produce more fruit. If these plants are grown under 10 hours of light daily, how would the results likely change if the plants are subjected to 12 hours of light daily? There would be less fruit production There would be more fruit production There would be no change in fruit production The plants would not survive None 4. ACT Science: Scientific Investigation In an experiment, a scientist uses varying amounts of salt to determine its effect on boiling point. If the boiling point of a solution increases with more salt, what is the most likely reason? Salt absorbs heat, raising the boiling point Salt lowers the freezing point, thus raising the boiling point Salt increases the solution's density, requiring more heat to boil Salt raises the solution's heat capacity, thus raising the boiling point None 5. ACT Science: Scientific Investigation A chemical reaction occurs in a closed system, and a gas is released as a byproduct. If the gas is contained in a balloon, what happens to the balloon's volume if the gas is allowed to expand in a larger container without changing pressure or temperature? The balloon's volume remains the same The balloon's volume decreases The balloon's volume increases The balloon bursts None 6. ACT Science: Scientific Investigation In an experiment to determine the optimal growth conditions for bacteria, scientists vary the temperature in a series of test tubes containing bacteria. If the bacteria grow best at a specific temperature, what would you expect to see in the results? Uniform growth in all test tubes Higher growth at the optimal temperature, with lower growth elsewhere No change in growth rates across test tubes Decreasing growth rates with increasing temperatures None 7. ACT Science: Scientific Investigation An experiment involves dropping a metal object into a beaker filled with a chemical solution. If the metal starts to dissolve upon contact with the solution, which of the following best explains this observation? The metal undergoes a chemical reaction with the solution The metal absorbs the solution, leading to dissolution The metal is melting due to the heat in the solution The metal expands upon contact with the solution None 8. ACT Science: Scientific Investigation A scientist observes the migration patterns of birds over a 10-year period. If the number of birds migrating annually decreases, which of the following is the most likely cause? Reduced food sources in the migratory areas Warmer weather in the migration path Changes in bird migration behavior All of the above None 9. ACT Science: Scientific Investigation A researcher is conducting an experiment to test plant growth under different soil conditions. If one group of plants receives soil with high nitrogen content while the other group receives regular soil, what would likely be observed in the results? Plants in the nitrogen-rich soil grow faster and larger Plants in the regular soil grow faster and larger No observable difference in growth rates Plants in the nitrogen-rich soil grow at a slower rate None 10. ACT Science: Scientific Investigation A scientist observes a population of insects over a year. If the population decreases during the colder months and increases during the warmer months, what might be the best explanation for this pattern? Insects are more active in warmer weather Insects are dormant during colder weather Insects have a longer life cycle in warmer weather All of the above None 1 out of 10 Time is Up! Time's up
