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Subjects

Science

Hypothesis and experimentation

In Class 9 Science, within “Exploration: Entering the World of Secondary Science,” students learn how scientific questions can be turned into testable hypotheses. They examine the difference between an observation, an inference, and a prediction; identify variables and controls; plan fair experiments; and record evidence carefully. The topic develops skills in measuring, organizing data, interpreting results, recognizing sources of error, and drawing conclusions supported by evidence. Students also understand that experiments refine ideas rather than simply prove them.

Medium · Level 2 · 25 questions

Practice questions

01A measuring cylinder was kept tilted during an experiment. What type of problem will this cause?

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02What problem may occur if a thermometer reading is recorded before it becomes stable?

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03If different groups record length in different units what should be done before comparison?

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04Which is the best method of recording experimental data?

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05A student recorded only the results that supported the hypothesis. This is an example of which problem?

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06What is the most appropriate action if an unknown chemical spills on the skin during an experiment?

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07Seed germination was tested at different temperatures. What could be an appropriate control group?

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08What problem arises if the seed species is also changed during an experiment?

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09Which statement has the correct form of a hypothesis?

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10What should be done if the results differ greatly across repeated trials?

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11What is checked when the same experiment is repeated by different students?

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12In which situation will an experimental result be more reliable?

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13If a student investigates whether wire length affects electrical resistance what should be kept the same?

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14If results support a hypothesis what is the most appropriate conclusion?

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15How can the term plant growth in a hypothesis be changed into a clear measurement?

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16In which experiment is the dependent variable correctly identified?

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17Time was different in every trial although it was not the independent variable. What effect will this have?

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18In which situation will the accuracy of a result be affected most?

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19At which stage are experimental data compared and interpreted?

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20Where is the independent variable usually placed in a data table?

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21Which experiment title is the clearest?

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22Why is performing five trials better than performing only one trial?

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23Which sequence is most appropriate for planning a scientific experiment?

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24Which is the most appropriate description of a good experiment?

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25A student hypothesises that a wet cloth will dry faster when exposed to more airflow. Which factor should be kept the same for a fair test?

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