IL112ILTS Science Environmental Science Practice
Exam
**Question 1.** Which step of the scientific method involves making a testable
statement about a phenomenon?
A) Observation
B) Hypothesis
C) Data analysis
D) Conclusion
Answer: B
Explanation: A hypothesis is a tentative, testable explanation that can be
investigated through experimentation.
**Question 2.** In an experiment, the variable that the researcher manipulates is
called the:
A) Dependent variable
B) Independent variable
C) Controlled variable
D) Confounding variable
Answer: B
Explanation: The independent variable is deliberately changed to observe its
effect on the dependent variable.
, IL112ILTS Science Environmental Science Practice
Exam
**Question 3.** The difference between a scientific law and a theory is that a law:
A) Explains why a phenomenon occurs
B) Is based on a single observation
C) Describes a pattern that is always true under given conditions
D) Changes with new evidence
Answer: C
Explanation: Laws describe consistent relationships; theories explain the
underlying mechanisms.
**Question 4.** Which statistical measure is most affected by an extreme outlier?
A) Mean
B) Median
C) Mode
D) Range
Answer: A
Explanation: The mean incorporates every value, so a very high or low outlier
shifts it more than the median or mode.
**Question 5.** A bar graph is most appropriate for displaying:
, IL112ILTS Science Environmental Science Practice
Exam
A) Changes in temperature over time
B) Distribution of a single continuous variable
C) Comparison of categorical data such as land‑use types
D) Relationship between two quantitative variables
Answer: C
Explanation: Bar graphs compare frequencies or totals across distinct categories.
**Question 6.** In a measurement, precision refers to:
A) How close a value is to the true value
B) The reproducibility of repeated measurements
C) The number of significant figures used
D) The instrument’s calibration
Answer: B
Explanation: Precision indicates the consistency of repeated measurements,
regardless of accuracy.
**Question 7.** Which instructional strategy best supports diverse learners
during a field investigation of water quality?
A) Lecture‑only presentation of the protocol
, IL112ILTS Science Environmental Science Practice
Exam
B) Providing written worksheets without visuals
C) Using hands‑on sampling, graphic organizers, and oral explanations
D) Assigning a lengthy research paper
Answer: C
Explanation: Combining tactile, visual, and auditory supports addresses varied
learning styles.
**Question 8.** The troposphere is distinguished from the stratosphere primarily
by:
A) Presence of the ozone layer
B) Temperature decreasing with altitude
C) Higher concentration of carbon dioxide
D) Absence of weather phenomena
Answer: B
Explanation: In the troposphere, temperature generally declines with height,
whereas in the stratosphere it increases.
**Question 9.** Which process moves water from the surface to the
atmosphere?
A) Condensation
Exam
**Question 1.** Which step of the scientific method involves making a testable
statement about a phenomenon?
A) Observation
B) Hypothesis
C) Data analysis
D) Conclusion
Answer: B
Explanation: A hypothesis is a tentative, testable explanation that can be
investigated through experimentation.
**Question 2.** In an experiment, the variable that the researcher manipulates is
called the:
A) Dependent variable
B) Independent variable
C) Controlled variable
D) Confounding variable
Answer: B
Explanation: The independent variable is deliberately changed to observe its
effect on the dependent variable.
, IL112ILTS Science Environmental Science Practice
Exam
**Question 3.** The difference between a scientific law and a theory is that a law:
A) Explains why a phenomenon occurs
B) Is based on a single observation
C) Describes a pattern that is always true under given conditions
D) Changes with new evidence
Answer: C
Explanation: Laws describe consistent relationships; theories explain the
underlying mechanisms.
**Question 4.** Which statistical measure is most affected by an extreme outlier?
A) Mean
B) Median
C) Mode
D) Range
Answer: A
Explanation: The mean incorporates every value, so a very high or low outlier
shifts it more than the median or mode.
**Question 5.** A bar graph is most appropriate for displaying:
, IL112ILTS Science Environmental Science Practice
Exam
A) Changes in temperature over time
B) Distribution of a single continuous variable
C) Comparison of categorical data such as land‑use types
D) Relationship between two quantitative variables
Answer: C
Explanation: Bar graphs compare frequencies or totals across distinct categories.
**Question 6.** In a measurement, precision refers to:
A) How close a value is to the true value
B) The reproducibility of repeated measurements
C) The number of significant figures used
D) The instrument’s calibration
Answer: B
Explanation: Precision indicates the consistency of repeated measurements,
regardless of accuracy.
**Question 7.** Which instructional strategy best supports diverse learners
during a field investigation of water quality?
A) Lecture‑only presentation of the protocol
, IL112ILTS Science Environmental Science Practice
Exam
B) Providing written worksheets without visuals
C) Using hands‑on sampling, graphic organizers, and oral explanations
D) Assigning a lengthy research paper
Answer: C
Explanation: Combining tactile, visual, and auditory supports addresses varied
learning styles.
**Question 8.** The troposphere is distinguished from the stratosphere primarily
by:
A) Presence of the ozone layer
B) Temperature decreasing with altitude
C) Higher concentration of carbon dioxide
D) Absence of weather phenomena
Answer: B
Explanation: In the troposphere, temperature generally declines with height,
whereas in the stratosphere it increases.
**Question 9.** Which process moves water from the surface to the
atmosphere?
A) Condensation
