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100+ Free JC Science Practice Questions

Junior Cycle Science (Ireland) practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: JC Science Exam

Common level

Junior Cycle Science is examined at common level

NCCA Junior Cycle Science specification

5 strand areas

Nature of Science plus Physical, Chemical, Biological, and Earth and space

NCCA / Curriculum Online Science specification

~2 hours

Typical length of the final written examination

State Examinations Commission arrangements

€109

Junior Cycle entry fee for 2026 (medical-card holders exempt)

State examinations fee information for 2026

Descriptors

Results reported with grade descriptors, not a simple pass/fail

State Examinations Commission / Junior Cycle reporting

Around age 15

Taken by third-year junior cycle students in Irish post-primary schools

NCCA Junior Cycle framework

MCQ study aid

This bank is a free English-language MCQ adaptation, not official SEC format

OpenExamPrep

100

Free original practice questions here

OpenExamPrep

Junior Cycle Science (Ireland) is a common-level SEC/NCCA lower-secondary science exam for third-year students. Strands: Nature of Science (unifying) plus Physical, Chemical, Biological world and Earth and space. Final written paper is typically up to about 2 hours and is not fixed-count MCQ; CBAs (CBA 1 Extended Experimental Investigation; CBA 2 Science in Society Investigation) are reported on the JCPA. The Assessment Task is not examined for the 2026–2028 sittings, when the SEC grade is based on the written exam only and students complete a minimum of one CBA. 2026 JC entry fee €109 (medical card exempt); grade descriptors, not pass/fail. This free bank is an English-language MCQ study adaptation, not an official-format simulation.

Sample JC Science Practice Questions

Try these sample questions to test your JC Science exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a fair test, which variable is the one you deliberately change?
A.Dependent variable
B.Independent variable
C.Control variable
D.Random variable
Explanation: The independent variable is the factor the investigator changes on purpose to see what effect it has. The dependent variable is measured as the outcome, and control variables are kept the same.
2Why do scientists usually repeat an experiment several times?
A.To change the independent variable each time
B.To make results more reliable and check consistency
C.To avoid needing any control variables
D.To guarantee the hypothesis is true
Explanation: Repeating trials helps you check whether results are consistent and improves reliability. Outliers become easier to spot, and averages are more trustworthy.
3What is a hypothesis in a scientific investigation?
A.A final proven law of nature
B.A testable prediction based on prior knowledge or observation
C.A list of equipment only
D.A random guess that cannot be tested
Explanation: A hypothesis is a clear, testable prediction that can be checked with evidence from an investigation. It is not already proven.
4Which feature makes a scientific investigation a fair test?
A.Changing several variables at once
B.Keeping all variables constant except the independent variable
C.Ignoring anomalies
D.Using only qualitative observations
Explanation: In a fair test, only the independent variable is changed deliberately; other relevant variables are controlled so differences in the dependent variable can be linked to the change you made.
5Which of the following is an example of a quantitative observation?
A.The liquid turned blue
B.The flame was noisy
C.The temperature rose by 12 °C
D.The mixture smelled sweet
Explanation: Quantitative observations use numbers and units. A temperature change of 12 °C is measured data; colour, sound and smell are qualitative.
6A student investigates how the amount of light affects plant growth. What is the dependent variable?
A.The type of plant used
B.The amount of light provided
C.How much the plant grows
D.The temperature of the room
Explanation: The dependent variable is what you measure as the outcome—here, plant growth. Light amount is the independent variable; plant type and temperature should be controlled.
7Why is a control group or control set-up useful in many experiments?
A.It replaces the need for any measurements
B.It provides a baseline for comparison when the independent variable is not applied
C.It always proves the hypothesis false
D.It removes all experimental error
Explanation: A control set-up shows what happens without the treatment (or with standard conditions), so you can compare and judge whether the independent variable caused a change.
8Which graph is usually best for continuous data such as temperature against time?
A.Pie chart
B.Bar chart of categories only
C.Line graph
D.Pictogram
Explanation: Line graphs are typically used when both variables are continuous (or when showing change over time), so trends can be seen clearly.
9A student measures the bounce height of a ball five times and gets 42, 41, 43, 20 and 42 cm. What should they do first about the 20 cm result?
A.Always delete it without comment
B.Ignore reliability completely
C.Check for a measurement or method mistake, then decide how to treat the anomaly
D.Average only the 20 cm value
Explanation: An outlier should be investigated: check equipment, method and recording errors. Then decide whether to repeat, exclude with justification, or include—never silently invent data.
10What does it mean if results are precise but not accurate?
A.Measurements are close to each other but not close to the true value
B.Measurements are all different and far from the true value
C.Measurements equal the true value every time
D.Precision and accuracy mean the same thing
Explanation: Precision means repeated measurements agree closely. Accuracy means they are close to the true or accepted value. You can be consistently wrong (precise but inaccurate).

About the JC Science Practice Questions

Verified exam format metadata for Junior Cycle Science (Ireland) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.