Science Reasoning Quiz
Test your scientific knowledge • 10 Questions
All Questions & Answers
Every question from ACT Practice Test 1 with the correct answer and a short explanation, so you can review the full set without working through the interactive cards above.
Q1. In an experiment, a remote-controlled car was tested with three types of wheels: hard rubber with treads, soft rubber, and studded. Which wheel type produced the highest speed?
- Hard rubber with treads
- Soft rubber wheels
- Studded wheels
- All wheels had equal speed
Answer:
Studded wheels
According to the study, studded wheels produced the highest speed of 6.44 ft/s. The studs provide better grip and reduced rolling resistance on the test surface, resulting in maximum speed.
Q2. Scientist 1 argues that Pluto should be classified as a planet. What is the PRIMARY basis for this argument?
- Pluto has multiple moons like other planets
- Pluto has a spherical shape similar to planets
- Pluto orbits the Sun in a circular path
- Pluto has an atmosphere like Earth
Answer:
Pluto has a spherical shape similar to planets
Scientist 1 bases the argument on Pluto’s spherical shape, which is a characteristic shared with recognized planets. Scientist 2 counters that Pluto is a Kuiper Belt object due to its icy composition and eccentric orbit.
Q3. In a solubility experiment, KCl and NaNO₃ were dissolved in 100g of H₂O at temperatures ranging from 0°C to 100°C. What general trend is observed as temperature increases?
- Solubility decreases for all solutes
- Solubility remains constant regardless of temperature
- Solubility increases for most solutes
- Solubility first increases then sharply decreases
Answer:
Solubility increases for most solutes
For most solid solutes like KCl and NaNO₃, solubility increases as temperature increases. This is because higher temperatures provide more kinetic energy, allowing more solute particles to dissolve in the solvent.
Q4. According to the fractional distillation study, at what temperature range is Gasoline collected as a by-product from crude oil?
- 100–120°C
- 40–70°C
- 150–200°C
- 20–35°C
Answer:
40–70°C
Gasoline is collected at 40–70°C during fractional distillation. Kerosene is collected at a higher range of 100–120°C. Different petroleum products are separated based on their different boiling points.
Q5. In the predator-prey cycle study (Practice Test 10), when the herbivore population increases significantly, what is the MOST LIKELY immediate effect on the carnivore population?
- Carnivore population immediately decreases
- Carnivore population gradually increases due to more food
- Carnivore population remains completely unaffected
- Carnivore population becomes extinct
Answer:
Carnivore population gradually increases due to more food
In predator-prey cycles, an increase in herbivore (prey) population provides more food for carnivores (predators), causing the carnivore population to gradually increase. This is a classic ecological relationship modeled in population dynamics.
Q6. In the Great Lakes seasonal turnover study, what is a ‘thermocline’?
- A layer of ice that forms on the lake surface in winter
- A boundary layer separating warm surface water from cold deep water
- A type of aquatic plant found in deep lakes
- The seasonal migration pattern of fish in lakes
Answer:
A boundary layer separating warm surface water from cold deep water
A thermocline is a distinct boundary layer in a body of water where temperature changes more rapidly with depth than in layers above or below. It separates warm surface water from cold deep water and plays a key role in seasonal turnover.
Q7. According to the radon gas study, a home in Zone 1 has radon levels above what threshold, requiring immediate action?
- 2 pCi/L
- 4 pCi/L
- 6 pCi/L
- 8 pCi/L
Answer:
4 pCi/L
Zone 1 is defined as areas where indoor radon levels are predicted to exceed 4 pCi/L (picocuries per liter). Homes in Zone 1 have the highest potential for elevated radon levels and require testing and mitigation.
Q8. In the solar evolution debate, Scientist 2 argues that life on Earth will end in approximately 1 billion years. What is the PRIMARY reason given?
- The Sun will explode in a supernova
- CO₂ levels will drop too low to support photosynthesis
- Earth’s oceans will completely evaporate
- Increased solar radiation will destroy the ozone layer
Answer:
CO₂ levels will drop too low to support photosynthesis
Scientist 2 argues that as the Sun brightens over time, increased temperatures will cause CO₂ levels to drop critically low. Without sufficient CO₂, photosynthesis cannot occur, ending plant life and eventually all life on Earth within approximately 1 billion years.
Q9. In the weathering mechanisms study, which of the following is classified as a form of CHEMICAL weathering?
- Crystallization
- Exfoliation
- Hydrolysis
- Action of lichens
Answer:
Hydrolysis
Hydrolysis is a chemical weathering process where water reacts chemically with minerals in rocks, breaking them down. Crystallization and exfoliation are physical weathering processes, while lichens represent biological weathering.
Q10. Based on the salt pan study in endorheic basins, what is the relationship between the age of the basin and the volume of minerals present?
- Older basins have less mineral volume due to erosion
- Mineral volume increases as the basin gets older
- Mineral volume is unrelated to basin age
- Younger basins always have more minerals than older ones
Answer:
Mineral volume increases as the basin gets older
In endorheic basins (closed drainage basins with no outflow), water evaporates and leaves behind minerals. Over time, as more water flows in and evaporates, mineral deposits accumulate. Therefore, older basins tend to have greater mineral volume.
Sources & References
Written and fact-checked by Dr. Irfan Mansuri. External links open in a new tab and are provided for further reading and verification.