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Subjects

Science

Nature and meaning of science

“Nature and Meaning of Science” introduces Class 9 students to science as a systematic way of exploring the natural world, rather than a collection of fixed facts. Within “Exploration: Entering the World of Secondary Science,” students examine how observation, questioning, evidence, measurement, reasoning, experimentation, and communication work together to build scientific knowledge. The topic also highlights curiosity, objectivity, creativity, responsible investigation, and how explanations change when new evidence emerges. It connects science with everyday experiences and prepares learners for inquiry-based study of later concepts.

Hard · Level 3 · 25 questions

Practice questions

01Which type of evidence is considered most reliable when evaluating the strength of a scientific claim?

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02A student concluded that fertiliser makes plants grow faster but also gave more water to fertilised plants. What is the main weakness of the conclusion?

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03Why is it not contradictory to call scientific knowledge both reliable and revisable?

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04A hypothesis claims that it will be correct regardless of the result. Why is it scientifically weak?

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05Two studies produced opposite results. What should the scientific community examine first?

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06If a measuring instrument gives a result two units above the true value every time what does this indicate?

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07Which problem may be reduced but not completely eliminated by averaging several measurements?

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08Which characteristic is most important in strengthening a scientific theory?

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09Which statement about scientific laws and theories is incorrect?

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10What is the best test of the usefulness of a scientific model?

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11A study has a very large sample but it was taken only from one expensive urban school. What is the main problem?

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12Which is the best way to maintain scientific objectivity?

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13A student says that a plant is diseased because its leaves are curled. Which statement is an inference?

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14A chart's vertical axis does not begin at zero and a small difference appears very large. What problem may result?

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15If a researcher publishes only positive results what problem may arise in scientific literature?

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16In an experiment the person measuring outcomes knows which group received treatment. Which risk increases?

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17A scientific claim is supported only by saying that a famous scientist accepted it. What is the main problem?

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18If a result appears in only one laboratory and others cannot reproduce it what conclusion is appropriate?

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19What is the correct meaning of scientific consensus?

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20Which question is most closely related to the validity of an experiment?

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21What is measurement reliability most closely related to?

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22A survey included only people who volunteered to participate. What problem may this illustrate?

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23A scientific conclusion is based on a small sample but applied to the whole country. What does this show?

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24Why is an operational definition created for a scientific concept?

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25In an experiment the control and treatment groups differ only in the treatment. What is the benefit?

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