Class 9 · Science · Exploration

1. Exploration: Entering the World of Secondary Science

Try question 1

A testable explanation that a scientist proposes before doing an experiment is called a

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Answer and explanation

Answer: B. hypothesis

A hypothesis is tested by experiments and observations.

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Try question 2

The SI unit of length is the

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Answer and explanation

Answer: B. metre

The metre (m) is the SI base unit of length.

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Try question 3

In a fair experiment, the factors that are kept the same are called

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Answer and explanation

Answer: A. controlled variables

Only one factor is changed at a time so its effect can be seen clearly.

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