Question 1

Which of the following best describes the main purpose of a scientific investigation?

Accepted Answer

To explain observations and test the conclusions of previous investigations

Question 2

In a controlled experiment testing the effect of fertilizer on plant growth, which is the dependent variable?

Accepted Answer

Plant height

Question 3

Which step in the scientific investigation process involves making a prediction that can be tested?

Accepted Answer

Form a hypothesis

Question 4

Why must all variables except the independent and dependent variables be controlled in an experiment?

Accepted Answer

To make sure the results are due to the independent variable only

Question 5

A scientist observes that a certain plant grows faster in sunlight than in shade. What is the next logical step in the scientific investigation process?

Accepted Answer

Ask a question

Question 6

Which of the following statements about scientific theories is correct?

Accepted Answer

Theories are well-established explanations that can change with new evidence

Question 7

What is the main difference between a hypothesis and a theory?

Accepted Answer

A hypothesis is a testable prediction, while a theory is a well-established explanation supported by evidence

Question 8

If an experiment’s results do not support the hypothesis, what should a scientist do next?

Accepted Answer

Revise the hypothesis or design a new experiment

Question 9

Which of the following is an example of a natural study in scientific investigation?

Accepted Answer

Observing animal behavior in the wild without manipulating variables

Question 10

Why are accurate measurements and observations important in scientific investigations?

Accepted Answer

They are necessary to draw plausible conclusions

Question 11

Which of the following best describes the role of creativity in scientific investigations?

Accepted Answer

Creativity helps scientists design experiments and interpret results

Question 12

A group of students wants to test if the amount of water affects seed germination. Which is the independent variable in their experiment?

Accepted Answer

Amount of water

Question 13

Which of the following is NOT a step in the scientific investigation process?

Accepted Answer

Prove the theory

Question 14

Why is it important for a hypothesis to be testable?

Accepted Answer

So experiments can be designed to support or refute it

Question 15

Which of the following best illustrates the use of a model in scientific investigation?

Accepted Answer

Creating a computer simulation of climate change

Question 16

A scientist repeats an experiment several times and gets similar results each time. What does this indicate?

Accepted Answer

The results are reliable

Question 17

Which equation best represents the relationship between the independent variable ($$x) $$and the dependent variable ($$y) in a $$simple linear experiment?

Accepted Answer

$$y = x + c$$

Question 18

If a new observation does not agree with an accepted scientific theory, what should scientists do?

Accepted Answer

Re-examine the observation and the theory

Question 19

Which of the following best describes a controlled variable in an experiment?

Accepted Answer

A variable that is kept constant to prevent it from affecting the outcome

Question 20

Why do scientists often repeat experiments before drawing conclusions?

Accepted Answer

To ensure the results are accurate and reliable

Scientific Investigation: Steps, Hypotheses, and Theories

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