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2026 Statistics
Key Facts: PAU General Sciences (La Rioja) Exam
90 min
Exam Duration
Universidad de La Rioja
0–10
Grading Scale
Comisión Organizadora PAU
4.0 / 10
Min. Access Phase Mark
Spanish PAU Regulations
EUR 55.43
Base Registration Fee
Universidad de La Rioja
The La Rioja PAU General Sciences exam (Ciencias Generales) is administered by Universidad de La Rioja (UR) for 2nd Bachillerato students entering Spanish universities. Lasting 90 minutes, it evaluates competence across scientific methodology, energy and environment, health and biotechnology, materials and technology, and global environmental challenges. Local questions in this bank serve as an English-language MCQ study adaptation for the official PAU 2026 exam.
Sample PAU General Sciences (La Rioja) Practice Questions
Try these sample questions to test your PAU General Sciences (La Rioja) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1What is the primary initial step of the scientific method when investigating a natural phenomenon?
A.Formulating a mathematical law prior to data collection
B.Making systematic empirical observations and posing a testable question
C.Drawing definitive conclusions before testing
D.Publishing preliminary hypotheses in a peer-reviewed journal
Explanation: The scientific method begins with systematic empirical observation of a natural phenomenon, which leads to formulating a clear, testable research question. Subsequent steps include generating a hypothesis, conducting controlled experiments, analyzing data, and drawing evidence-based conclusions.
2In a controlled experiment examining the effect of light intensity on plant photosynthetic rate, what is the independent variable?
A.The light intensity directly manipulated by the experimenter
B.The volume of oxygen produced by the plant
C.The room temperature kept constant across all trials
D.The measurement error of the gas sensor
Explanation: The light intensity directly manipulated by the experimenter is the independent variable because it is the factor intentionally altered to observe its effect on the system.
3Why are controlled variables kept identical across all experimental groups during a scientific trial?
A.To maximize the value of the dependent variable
B.To ensure that any observed changes in the dependent variable are caused solely by the independent variable
C.To eliminate the need for a control group
D.To change the sample size during testing
Explanation: Controlled variables are held constant so that any observed variation in the dependent variable can be confidently attributed solely to the manipulation of the independent variable, preventing confounding factors.
4What defines a scientific hypothesis in empirical research?
A.An unchangeable scientific law accepted without proof
B.A tentative, testable, and falsifiable explanation for a natural phenomenon
C.A proven theory supported by centuries of consensus
D.A subjective opinion regarding ethical principles
Explanation: A hypothesis is a tentative, testable, and falsifiable explanation that provides a starting point for empirical investigation and experimental validation.
5How do systematic errors differ from random errors in scientific measurements?
A.Systematic errors cause predictable, consistent shifts in one direction, while random errors produce unpredictable fluctuations around a mean
B.Random errors can be completely eliminated by calibrating instruments, while systematic errors cannot
C.Systematic errors only affect precision, while random errors only affect accuracy
D.Random errors always shift measurements higher than the true value
Explanation: Systematic errors cause predictable, consistent shifts in one direction (affecting accuracy), whereas random errors stem from uncontrollable environmental fluctuations and cause unpredictable scatter around the true value (affecting precision).
6A student measures the boiling point of pure water five times and obtains 94.1°C, 94.2°C, 94.1°C, 94.0°C, and 94.1°C at standard atmospheric pressure (true value: 100.0°C). How should these measurements be characterized?
A.High accuracy and high precision
B.Low accuracy and high precision
C.High accuracy and low precision
D.Low accuracy and low precision
Explanation: The measurement set has low accuracy because the mean (~94.1°C) deviates significantly from the true value (100.0°C), but high precision because the values are tightly clustered together with minimal spread.
7In a biomedical trial testing a new antibacterial compound, what is the role of a negative control group treated with sterile water?
A.To establish a baseline condition showing what occurs in the absence of the active antibacterial agent
B.To confirm that the highest possible bacterial killing rate is achieved
C.To introduce intentional systematic error into the data set
D.To substitute for the experimental group in data collection
Explanation: A negative control group treated with sterile water provides a baseline showing background bacterial growth in the absence of the active treatment, ensuring that any bacterial inhibition observed in the experimental group is genuinely attributable to the drug.
8Why does increasing the sample size in an ecological field study improve the reliability of the research findings?
A.It eliminates all systematic calibration errors in measurement tools
B.It reduces the impact of random sampling variability and provides a better estimate of the true population parameters
C.It proves that the hypothesis is a universal law of nature
D.It converts qualitative observational data into quantitative physical constants
Explanation: Increasing sample size reduces the standard error of the mean and mitigates the effect of random sampling variation, yielding a sample mean that more closely estimates the true population parameter.
9Which graphical format is best suited for illustrating continuous change in global atmospheric carbon dioxide concentration over a 50-year period?
A.A pie chart showing proportional slices of gases
B.A line graph plotting concentration on the y-axis against time on the x-axis
C.A bar chart comparing discrete categorical bins
D.A Venn diagram showing overlapping gas properties
Explanation: A line graph with time on the continuous x-axis and CO2 concentration on the continuous y-axis effectively depicts trends, rates of change, and fluctuations over continuous time series.
10An epidemiological study observes a strong positive correlation between ice cream sales and drowning incidents in summer. What logical fallacy occurs if one concludes that eating ice cream causes drowning?
A.Confusing correlation with causation by ignoring a confounding variable (ambient temperature)
B.Failing to use double-blind laboratory protocols
C.Committing a systematic calibration error during survey collection
D.Violating the first law of thermodynamics
Explanation: Assuming causation from correlation ignores the confounding variable of hot weather (summer temperature), which independently increases both ice cream consumption and swimming activity.
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