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. Which statement best describes scientific exploration?
a) Memorising facts without questioning them
b) Using observation, evidence, reasoning and testing to understand nature
c) Accepting every prediction as correct
d) Avoiding mathematical reasoning
Q2. A model of Earth as a sphere with layers is useful because:
a) Earth is actually a perfect smooth sphere in every detail
b) it simplifies the complex structure for a particular purpose
c) it eliminates the need for evidence
d) it cannot be changed
Q3. Which is a reason for using mathematical equations in science?
a) To make science difficult
b) To express relationships precisely
c) To replace experiments
d) To avoid measurements
Q4. Which statement is true about scientific laws?
a) They are personal beliefs.
b) They describe regular patterns in nature.
c) They are always explanations of why something happens.
d) They are guesses.
Q5. Which statement is true about scientific theories?
a) A theory is an untested idea.
b) A theory provides an evidence-based explanation.
c) A theory cannot be examined.
d) A theory is the same as an opinion.
Q6. Which situation best demonstrates estimation?
a) Finding the exact mass of a chemical sample
b) Quickly estimating the amount of food needed for a group
c) Measuring medicine dosage
d) Calibrating a laboratory instrument
Q7. If an observation disagrees with a model, the observation should:
a) be ignored
b) be considered as evidence that may require the model to be re-examined
c) be changed to match the model
d) never be repeated
Q8. Which is most important for a testable scientific prediction?
a) It should involve measurable or observable consequences.
b) It should be impossible to check.
c) It should depend only on opinion.
d) It should always produce the expected result.
Q9. Which of the following is NOT a reason for simplifying a model?
a) To focus on relevant factors
b) To make a complex system easier to study
c) To deliberately remove every useful detail
d) To make reasoning manageable
Q10. The study of climate change can involve:
a) only one branch of science
b) several branches of science and mathematics
c) only mathematics
d) no scientific evidence
Section B — Very Short Answer
5 × 2 = 10 marks
Q11. What is the purpose of a model?
Q12. Why is a scientific theory considered reliable even though it can be revised?
Q13. What is one limitation of estimation?
Q14. Why should a scientific prediction be testable?
Q15. Give one example of science being connected with mathematics.
Section C — Short Answer Questions
4 × 3 = 12 marks
Q16. Explain with an example how ignoring some details can improve a scientific model.
Q17. Explain the importance of symbols and units in science.
Q18. Why can a prediction be useful even if it turns out to be incorrect?
Q19. How can scientific thinking help a student evaluate a claim seen on social media?
Section D — Competency-Based Questions
2 × 4 = 8 marks
Q20. A social-media post claims, “Food becomes harmful during a solar eclipse.”
a) What scientific questions could be asked to examine the claim?
b) What type of evidence would help test it?
c) Why should the claim not be accepted merely because many people repeat it?
Q21. A student estimates that a family of four takes approximately 10,000 breaths per person per day.
a) Estimate the total number of breaths taken by the family in one day.
b) Why might the actual number differ?
c) Why is estimation useful in this situation?
Section E — Long Answer Questions
2 × 5 = 10 marks
Q22. Explain how scientific knowledge develops over time. Include the roles of evidence, models, predictions and revision.
Q23. “Science has no walls.” Explain this statement with examples showing how different branches of science work together to solve real-world problems.