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2026 Statistics
Key Facts: PAU General Sciences (Castilla y León) Exam
90 min
Exam Duration
Junta de Castilla y León
0–10
Grading Scale
USAL / PAU Commission
4.0 / 10
Min. Access Phase Mark
Spanish PAU Regulations
60 / 40
GPA / PAU Weighting
Spanish University Access Regulations
The Castilla y León PAU General Sciences exam (Ciencias Generales) is administered by Junta de Castilla y León and public universities (USAL, UVA, UBU, ULE) for 2nd Bachillerato students entering Spanish universities. Lasting 90 minutes, it evaluates competence across scientific methodology, energy systems, materials science, global health, and biotechnology. Local questions in this bank serve as an English-language MCQ study adaptation for the official PAU 2026 exam.
Sample PAU General Sciences (Castilla y León) Practice Questions
Try these sample questions to test your PAU General Sciences (Castilla y León) 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 initial step of the scientific method when conducting an empirical investigation in General Sciences?
A.Formulating a mathematical law before collecting data
B.Making systematic observations and posing a testable research question
C.Drawing definitive conclusions prior to experimental verification
D.Publishing preliminary hypotheses in scientific journals
Explanation: The scientific method begins with careful, objective observation of a natural phenomenon, which leads to formulating a clear, testable research question. Subsequent steps include hypothesis generation, experimental testing, data collection, and evidence-based conclusion.
2In a controlled scientific experiment evaluating plant growth under varying light wavelengths, what represents the independent variable?
A.The light wavelength intentionally manipulated by the researcher
B.The height and biomass of the plants measured after four weeks
C.The ambient room temperature and soil moisture kept constant
D.The systematic error introduced by measurement instruments
Explanation: The independent variable is the single factor intentionally changed or manipulated by the experimenter (in this case, light wavelength). The dependent variable is measured to observe the response caused by altering the independent variable.
3Why is a negative control group essential when testing the efficacy of a new chemical water purifier?
A.To ensure the independent variable is maximized in every test tube
B.To establish a baseline measurement in the absence of the active purifying agent
C.To guarantee that all experimental samples produce identical quantitative results
D.To eliminate the need for repeating experimental trials
Explanation: A negative control group receives no active treatment, providing a baseline to confirm that observed changes in experimental groups are genuinely caused by the purifying agent rather than background environmental factors.
4Which characteristic is essential for a scientific hypothesis to be valid within the framework of modern science?
A.It must be proven true beyond all future doubt prior to testing
B.It must be testable and capable of being proven false (falsifiable)
C.It must rely exclusively on qualitative personal opinions
D.It must align with popular public voting consensus
Explanation: Karl Popper demonstrated that scientific hypotheses must be falsifiable—meaning there must be conceivable empirical observations or experimental outcomes that could prove the hypothesis false. Hypotheses that cannot be tested or falsified fall outside scientific inquiry.
5A laboratory balance consistently measures a 10.00 gram standard mass as 10.45 grams across twenty consecutive trials. How should this measurement error be classified?
A.Random error affecting precision
B.Systematic error affecting accuracy
C.Statistical variance caused by sample size limits
D.Human transcription error
Explanation: Systematic error causes measurements to consistently deviate from the true value in the same direction (offset bias), impairing accuracy despite high repeatability (precision). Recalibrating the balance eliminates systematic error.
6Which graphical representation is most suitable for displaying continuous data showing river nitrate concentration over a twelve-month period?
A.Pie chart
B.Line graph
C.Bar chart
D.Venn diagram
Explanation: A line graph is ideal for continuous numerical data plotted against a continuous independent variable such as time, clearly revealing trends, seasonal fluctuations, and rates of change over consecutive months.
7Why does increasing sample size from 10 to 1,000 subjects improve the statistical reliability of a clinical trial?
A.It completely eliminates all systematic measurement errors
B.It reduces the margin of random error and increases statistical power
C.It converts qualitative observational data into physical constants
D.It guarantees that every subject experiences an identical therapeutic outcome
Explanation: Larger sample sizes reduce random sampling variation, narrow confidence intervals, and increase statistical power, making the study sample more representative of the target population.
8An epidemiological study observes a strong positive correlation between ice cream consumption and sunburn cases in coastal towns. What logical fallacy occurs if one concludes that eating ice cream causes sunburn?
A.Confusing correlation with causation due to an unmeasured confounding variable (ambient summer temperature)
B.Ignoring the law of conservation of mass in biological tissue
C.Assuming random measurement error accounts for all observed data
D.Failing to establish a double-blind peer review board
Explanation: Correlation indicates two variables fluctuate together, but does not prove direct causation. Hot summer weather acts as a confounding variable that independently increases both ice cream sales and outdoor sun exposure.
9In scientific hypothesis testing, what does a p-value of less than 0.05 (p < 0.05) signify?
A.There is a 95% probability that the null hypothesis is entirely true
B.The probability of observing the experimental results by random chance under the null hypothesis is less than 5%
C.The experimental sample size was 5% smaller than required
D.The experiment contains a 5% systematic calibration error
Explanation: A p-value < 0.05 indicates that if the null hypothesis were true (no real effect), there would be less than a 5% chance of obtaining results as extreme as observed. This justifies rejecting the null hypothesis in favor of statistical significance.
10Two sets of soil pH measurements yield the following results: Group A = {6.8, 6.9, 6.8, 6.9} and Group B = {5.5, 6.8, 7.2, 8.1}. How do their standard deviations compare?
A.Group A has a lower standard deviation than Group B, indicating greater precision
B.Group B has a lower standard deviation than Group A, indicating greater accuracy
C.Both groups have identical standard deviations because their means are similar
D.Group A has a higher standard deviation because its values are closer together
Explanation: Standard deviation measures data dispersion around the mean. Group A values are tightly clustered (SD ≈ 0.06), reflecting high precision, whereas Group B values are widely spread (SD ≈ 1.07).
About the PAU General Sciences (Castilla y León) Practice Questions
Verified exam format metadata for Castilla y León PAU General Sciences / Ciencias Generales Exam is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.