Class: 9
Subject: Science
Chapter: Exploration: Entering the World of Secondary Science
Maximum Marks: 50
Suggested Time: 1 Hour 30 Minutes
Section A — Objective Questions
10 × 1 = 10 marks
Q1. A model is useful when it:
a) answers a specific scientific question
b) includes every detail of a system
c) replaces evidence
d) is never modified
Q2. Which of the following is a reason for using SI units?
a) They are based on personal preference.
b) They provide internationally agreed standards.
c) They make measurements less precise.
d) They are used only in laboratories.
Q3. Which quantity is commonly represented by v?
a) volume only
b) velocity
c) voltage only
d) mass
Q4. Which statement about scientific predictions is correct?
a) A prediction must always be correct.
b) A prediction can be tested against observations.
c) Predictions are based only on imagination.
d) Predictions do not require evidence.
Q5. Which is most likely to require an exact value?
a) estimating monthly rice consumption
b) estimating travel time
c) determining a medicine dose
d) guessing the number of people in a crowd
Q6. A scientific law generally tells us:
a) what pattern occurs
b) what a scientist personally believes
c) why every event occurs
d) what cannot be measured
Q7. Scientific models involve assumptions because:
a) reality is simple
b) simplification requires decisions about what to include
c) scientists dislike details
d) assumptions are always correct
Q8. Which example best represents interdisciplinary science?
a) studying only the colour of a book
b) understanding a mask using physics, chemistry, biology and mathematics
c) memorising a unit
d) copying a definition
Q9. A prediction based on repeated observations is generally:
a) more evidence-based
b) automatically certain
c) impossible to test
d) unrelated to science
Q10. If new evidence conflicts with an existing scientific explanation, science:
a) refuses to change
b) examines and revises explanations when necessary
c) ignores the evidence
d) stops making predictions
Section B — Very Short Answer
5 × 2 = 10 marks
Q11. Why may air resistance be ignored in a simple model of a falling object?
Q12. Why should scientific measurements include units?
Q13. What does “evidence-based” mean?
Q14. Give one example of a prediction made using science.
Q15. Why is estimation useful for detecting unreasonable answers?
Section C — Short Answer Questions
4 × 3 = 12 marks
Q16. Explain how a model can be useful even though it is not a complete representation of reality.
Q17. Explain why different branches of science should not be treated as completely separate in real-life problems.
Q18. What is the relationship between measurement and scientific knowledge?
Q19. A weather prediction says there is a high chance of rain, but no rain occurs. Does this prove that science has failed? Explain.
Section D — Case-Based Questions
2 × 4 = 8 marks
Q20. A school wants to estimate how much drinking water students use in one day. A student assumes 1 L per student and there are 800 students.
a) What is the estimated amount of water?
b) Why is the result not necessarily the actual amount?
c) Give one factor that could make the actual value higher or lower.
Q21. A student claims, “This plant grows faster because it is placed near the window.”
a) What additional evidence should be collected?
b) Name one variable that should be kept similar when comparing plants.
c) Why is one observation not enough to establish a reliable scientific conclusion?
Section E — Long Answer Questions
2 × 5 = 10 marks
Q22. Describe the process of turning an everyday observation into a scientifically testable prediction.
Q23. Explain why standardisation of units is important using an everyday or scientific example.