Question 1: What is the main focus of science at the secondary stage according to this chapter?
(a) Only memorising facts
(b) Only doing experiments
(c) Deep exploration and understanding how science works
(d) Learning only formulas
Answer: (c) Deep exploration and understanding how science works
Explanation: At the secondary stage, science is not only about facts. It is also about observation, measurement, models, equations, testing ideas, and revising them when needed.
Question 2: What does the magnifying glass symbol in the textbook represent?
(a) Measurement
(b) Careful observation
(c) Direction
(d) Speed
Answer: (b) Careful observation
Explanation: The magnifying glass symbolises careful observation, noticing patterns, and paying attention to things that might otherwise be missed.
Question 3: What does the compass symbol in the textbook represent?
(a) Curiosity only
(b) Deep calculation
(c) Direction in exploration
(d) Laboratory safety
Answer: (c) Direction in exploration
Explanation: The compass reminds us that scientific exploration needs direction, suitable models, and the right questions.
Question 4: Why does science use models?
(a) To make science difficult
(b) To copy every detail exactly
(c) To simplify complex systems
(d) To avoid observations
Answer: (c) To simplify complex systems
Explanation: The natural world is complex, so science uses simplified models that focus only on what is important for a given question.
Question 5: In physics, a moving car may be represented as:
(a) A machine with all parts shown
(b) A coloured box
(c) A single point
(d) A chemical structure
Answer: (c) A single point
Explanation: In physics, a moving car may be treated as a single point when only its motion is being studied.
Question 6: When studying a falling object in a simple model, which factor may be ignored first?
(a) Gravity
(b) Mass
(c) Air resistance
(d) Time
Answer: (c) Air resistance
Explanation: To understand the basic effect of gravity, air resistance may be neglected in a simple model.
Question 7: In the example of a cricket shot, which detail is important in a simple model?
(a) Brand of the bat
(b) Colour of the ball
(c) Speed and direction of the ball
(d) Amount of grass on the field
Answer: (c) Speed and direction of the ball
Explanation: To predict whether the ball crosses the boundary, the speed, direction, and mass of the ball matter most.
Question 8: Which of the following may be ignored in a simple model of a cricket shot?
(a) Speed of the ball
(b) Direction of the ball
(c) Mass of the ball
(d) Colour of the ball
Answer: (d) Colour of the ball
Explanation: The colour of the ball does not affect whether it crosses the boundary in a simple model.
Question 9: Why does science use precise language?
(a) To make learning longer
(b) To communicate clearly and avoid confusion
(c) To reduce observation
(d) To remove experiments
Answer: (b) To communicate clearly and avoid confusion
Explanation: Scientific words have specific meanings so that ideas can be shared clearly and unambiguously.
Question 10: Which of the following is a scientific symbol for electric current?
(a) m
(b) v
(c) F
(d) I
Answer: (d) I
Explanation: The chapter gives examples such as m for mass, v for velocity, F for force, and I for electric current.
Question 11: Mathematics in science is mainly a:
(a) Hurdle
(b) Decoration
(c) Language for clear thinking
(d) Type of experiment
Answer: (c) Language for clear thinking
Explanation: Mathematics helps us express relationships clearly and reason carefully about the world.
Question 12: An equation in science is:
(a) Only a calculation trick
(b) A compact statement of relationships
(c) A difficult puzzle
(d) Just a memory test
Answer: (b) A compact statement of relationships
Explanation: The chapter explains that an equation shows how quantities are related, not just how to calculate numbers.
Question 13: Why are standard units important?
(a) They make trade unfair
(b) They create confusion
(c) They avoid errors and ensure fairness
(d) They replace observation
Answer: (c) They avoid errors and ensure fairness
Explanation: Standard units help compare measurements correctly in science and daily life and avoid conversion mistakes.
Question 14: The aircraft fuel incident mentioned in the chapter happened because of confusion between:
(a) Metres and centimetres
(b) Kilograms and pounds
(c) Hours and minutes
(d) Litres and millilitres
Answer: (b) Kilograms and pounds
Explanation: The fuel was miscalculated because pounds per litre were used instead of kilograms per litre.
Question 15: A scientific law usually describes:
(a) A moral rule
(b) A regular pattern in nature
(c) A laboratory machine
(d) A social belief
Answer: (b) A regular pattern in nature
Explanation: A law describes an observed regularity, often using words or mathematical relationships.
Question 16: A scientific theory explains:
(a) Only guesses
(b) Why patterns occur
(c) Only calculations
(d) Only laboratory accidents
Answer: (b) Why patterns occur
Explanation: A theory provides an explanation based on evidence collected over time.
Question 17: In science, a theory means:
(a) A random idea
(b) An untested guess
(c) A carefully tested explanation
(d) A personal opinion
Answer: (c) A carefully tested explanation
Explanation: The chapter clearly states that in science, a theory does not mean a guess. It is based on testing and critical examination.
Question 18: Which of the following is an example of a principle?
(a) Atomic theory
(b) Newton’s laws
(c) Principle of conservation of energy
(d) Brand of a measuring tool
Answer: (c) Principle of conservation of energy
Explanation: The chapter gives conservation of energy as an example of a principle.
Question 19: One of the remarkable strengths of science is its ability to:
(a) Create confusion
(b) Avoid evidence
(c) Make predictions
(d) Reject measurements
Answer: (c) Make predictions
Explanation: Science helps predict what may happen in new situations by using laws, theories, and models.
Question 20: Scientific predictions are based on:
(a) Luck
(b) Superstition
(c) Guesswork only
(d) Evidence and careful reasoning
Answer: (d) Evidence and careful reasoning
Explanation: Scientific predictions are reasoned expectations based on evidence, not random guesses.
Question 21: To make a rain prediction scientific, we should use:
(a) Only feelings
(b) Measurable evidence and past patterns
(c) Rumours
(d) Colourful language
Answer: (b) Measurable evidence and past patterns
Explanation: The chapter’s example of rain prediction shows that humidity, wind, and temperature are useful measurable factors.
Question 22: Weather forecasts sometimes go wrong because weather depends on:
(a) One fixed factor
(b) Unchanging air
(c) Many changing factors
(d) Only cloud colour
Answer: (c) Many changing factors
Explanation: Weather depends on temperature, pressure, humidity, and wind, and tiny changes can grow over time.
Question 23: When predictions do not match observations, scientists should:
(a) Ignore the result
(b) Keep the same idea without checking
(c) Re-examine assumptions and models
(d) Stop doing science
Answer: (c) Re-examine assumptions and models
Explanation: When predictions fail, scientists check assumptions, models, and measurements. This improves science.
Question 24: Which statement about science is correct?
(a) Scientific theories are final forever
(b) Science never changes
(c) Scientific ideas can improve with new evidence
(d) Science depends on opinion
Answer: (c) Scientific ideas can improve with new evidence
Explanation: No scientific theory is final. Science remains open to correction through evidence.
Question 25: The chapter’s eclipse example teaches students to:
(a) Believe every viral claim
(b) Accept superstition without thinking
(c) Ask scientific questions and look for evidence
(d) Stop eating during shadows
Answer: (c) Ask scientific questions and look for evidence
Explanation: The chapter uses the eclipse claim to show that evidence, not popular belief, should guide thinking.
Question 26: Estimation in science is useful because it helps students:
(a) Avoid reasoning
(b) Detect errors and build intuition
(c) Ignore quantities
(d) Memorise without understanding
Answer: (b) Detect errors and build intuition
Explanation: Rough estimates help us judge whether an answer is reasonable or impossible.
Question 27: According to the chapter, an approximate answer is often:
(a) Useless
(b) Better than all exact answers
(c) Enough in early stages of reasoning
(d) Not scientific
Answer: (c) Enough in early stages of reasoning
Explanation: The chapter says exact values are not always necessary first; approximate reasoning is often enough to test sense and logic.
Question 28: The chapter estimates that a person breathes about how much air in one day?
(a) 10 litres
(b) 100 litres
(c) 1000 litres
(d) 10,000 litres
Answer: (d) 10,000 litres
Explanation: Using approximate breaths per minute and volume per breath, the chapter estimates about 10,000 litres of air per day.
Question 29: Real-world problems usually require:
(a) Only one branch of science
(b) No mathematics
(c) Ideas from several disciplines together
(d) Only theory and no experiment
Answer: (c) Ideas from several disciplines together
Explanation: Problems like climate change, medicines, and sustainable technology need knowledge from multiple branches.
Question 30: Science is best described as:
(a) Only a collection of facts
(b) A human activity shaped by curiosity and questioning
(c) Only equations and experiments
(d) A fixed body of knowledge that never changes
Answer: (b) A human activity shaped by curiosity and questioning
Explanation: The chapter concludes that science is a human activity built through curiosity, creativity, collaboration, and learning from mistakes.
