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2026 Statistics
Key Facts: PAU General Sciences (Aragón) Exam
90 min
Exam Duration
UNIZAR PAU Commission
0–10
Grading Scale
Gobierno de Aragón
4.0 / 10
Min. Access Phase Mark
PAU Regulations
60 / 40
GPA / PAU Weighting
Spanish University Access Regulations
The Aragón PAU General Sciences exam (Ciencias Generales) is administered by the PAU Organising Commission of Aragón / UNIZAR for 2nd Bachillerato students entering Spanish universities. Lasting 90 minutes, it assesses proficiency in scientific methodology, physics, environmental chemistry, biotechnology, and ecology. Questions here serve as an English MCQ study adaptation for the Aragón PAU 2026 exam.
Sample PAU General Sciences (Aragón) Practice Questions
Try these sample questions to test your PAU General Sciences (Aragón) 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 purpose of formulating a hypothesis during a scientific investigation?
A.To provide an unalterable conclusion before gathering data
B.To propose a testable, falsifiable explanation for an observed phenomenon
C.To prove that a theoretical scientific law is universally invalid
D.To eliminate the need for experimental variable controls
Explanation: A hypothesis is a tentative, testable, and falsifiable explanation for an observation. It guides experimental design by making specific predictions that can be empirically evaluated.
2In an experiment testing how temperature affects enzyme activity, which variable represents the independent variable?
A.The rate of enzyme-catalyzed product formation
B.The constant pH of the reaction buffer solution
C.The systematically varied temperature of the reaction mixture
D.The total volume of substrate added to each tube
Explanation: The independent variable is the condition purposefully manipulated by the researcher—in this case, the temperature. The rate of reaction is the measured dependent variable.
3Which statement best distinguishes a scientific law from a scientific theory?
A.A law describes a consistent natural pattern or relationship, whereas a theory provides an overarching explanatory framework
B.A law is an unproven hypothesis, while a theory is a fully verified fact that cannot be revised
C.A law explains why natural phenomena occur, whereas a theory only summarizes mathematical formulas
D.A law is based solely on qualitative observations, while a theory relies exclusively on quantitative calculations
Explanation: A scientific law describes what happens in nature under specific conditions (often mathematically), while a scientific theory explains why or how natural phenomena occur based on extensive evidence.
4Why is peer review critical in the scientific publication process?
A.It guarantees that published scientific results will never require future correction
B.It allows independent experts to evaluate methodology, data integrity, and logical reasoning before publication
C.It converts subjective personal opinions directly into accepted scientific laws
D.It replaces the need for independent replication of experimental findings
Explanation: Peer review involves evaluation of a manuscript by independent domain experts to ensure methodological rigor, valid data analysis, ethical compliance, and sound conclusions prior to journal publication.
5A researcher measures a solution's concentration four times and obtains 5.01 mg/L, 5.02 mg/L, 5.00 mg/L, and 5.01 mg/L. The actual concentration is 8.50 mg/L. 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: Precision refers to the repeatability of measurements (which are closely clustered around 5.01 mg/L), while accuracy refers to closeness to the true value (8.50 mg/L). Therefore, the data exhibit high precision but low accuracy.
6When interpreting a graph showing global mean temperature anomalies over time, what type of error is introduced by uncalibrated temperature sensors across weather stations?
A.Random statistical fluctuation error
B.Systematic measurement error
C.Sampling bias error
D.Human transcription error
Explanation: Uncalibrated instruments consistently offset measurements in a specific direction (either always too high or always too low), which is the definition of systematic error.
7What is the primary function of a negative control group in a medical clinical trial?
A.To demonstrate the maximum possible therapeutic effect of a known active drug
B.To baseline background noise, placebo response, or non-treatment changes for comparison
C.To ensure all participants receive experimental gene therapies simultaneously
D.To intentionally induce adverse symptoms to test hospital capacity
Explanation: A negative control group (e.g., receiving a placebo) establishes a baseline response in the absence of the experimental treatment, allowing researchers to isolate the true effect of the drug from background factors.
8In statistical data analysis, why does correlation between two variables not prove causation?
A.Correlation only applies to qualitative variables, whereas causation requires quantitative variables
B.An observed mathematical association may be driven by an unobserved third variable (confounder) or coincidental alignment
C.Statistical correlation automatically invalidates all experimental hypothesis testing
D.Causation can only be established using computer simulations without empirical field data
Explanation: Correlation indicates that two variables change together, but this association could be caused by a confounding third variable or coincidental correlation. Establishing causation requires controlled experimental manipulation.
9Which ethical principle in research with human subjects mandates that participants fully understand study risks before agreeing to join?
A.Double-blind randomization protocol
B.Informed consent
C.Peer-reviewed pre-registration
D.Intellectual property licensing
Explanation: Informed consent requires that human research participants receive transparent, comprehensive information regarding the study's purpose, procedures, potential risks, and benefits before voluntarily consenting to participate.
10What occurs when a scientific community experiences a 'paradigm shift' as defined by philosopher Thomas Kuhn?
A.Minor incremental adjustments are made to standard laboratory measuring tools
B.An existing foundational scientific framework is replaced by a new framework due to accumulating anomalies
C.All historical scientific publications published prior to fifty years ago are declared invalid
D.Scientists agree to stop testing hypotheses and accept philosophical dogmas
Explanation: A paradigm shift occurs when a prevailing scientific framework (paradigm) cannot explain a growing body of anomalous evidence, leading to a revolutionary shift to an entirely new theoretical paradigm (e.g., Newtonian mechanics to general relativity).
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