Question 1

Which of the following best describes a scientific theory?

Accepted Answer

A well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses.

Question 2

Which of the following statements about the nature of scientific knowledge is most accurate?

Accepted Answer

Scientific knowledge is tentative and subject to change as new evidence is discovered.

Question 3

A scientist claims that the conductivity of copper wire is related to its temperature. According to the scientific method, what is this statement an example of?

Accepted Answer

A hypothesis

Question 4

Which of the following is a key difference between a scientific law and a scientific theory?

Accepted Answer

A law describes how phenomena behave, while a theory explains why they behave that way.

Question 5

Ohm's Law is given by the formula $$V = I 	imes R. If a $$resistor has a resistance of $$5\ \Omega$$ and a current of $$2\ \mathrm{A}$$ flows through it, what is the voltage across the resistor?

Accepted Answer

$$10\ \mathrm{V}$$

Question 6

Which of the following best illustrates the tentative and changing nature of scientific knowledge?

Accepted Answer

The reclassification of Pluto from a planet to a dwarf planet after new observations and discussions among scientists.

Question 7

A student observes that a metal rod gets hotter as more current passes through it. She proposes that the temperature increase is due to the kinetic energy of electrons. According to the claim-evidence-reasoning framework, what is her reasoning?

Accepted Answer

The explanation that connects the evidence (temperature increase) to the claim (kinetic energy of electrons causes heating).

Question 8

Which of the following is NOT a tenet of the nature of science (NoS) as described in the study materials?

Accepted Answer

Scientific knowledge is absolute and unchanging.

Question 9

A group of scientists develops a new explanation for superconductivity that incorporates quantum mechanics, experimental data, and previous laws. What is this new explanation most likely to be classified as?

Accepted Answer

A theory

Question 10

Which of the following best demonstrates the importance of communication and negotiation in the development of scientific knowledge?

Accepted Answer

Scientists publishing their findings in peer-reviewed journals and discussing results at conferences.

Question 11

A student claims that increasing the voltage across a resistor will increase the current through it. Which law supports this claim, and what is the formula?

Accepted Answer

Ohm's Law; $$V = I 	imes R$$

Question 12

Which of the following statements about hypotheses is correct?

Accepted Answer

A hypothesis is a testable statement that can be used to build more complex inferences and explanations.

Question 13

A scientist observes that a certain material conducts electricity better at lower temperatures. She proposes that this is due to reduced atomic vibrations. What is her claim?

Accepted Answer

The material conducts electricity better at lower temperatures due to reduced atomic vibrations.

Question 14

Which of the following is an example of a scientific law?

Accepted Answer

Ohm's Law: $$V = I 	imes R$$

Question 15

Which of the following best describes the difference between 'nature' and 'scientific knowledge' as discussed in the study materials?

Accepted Answer

Nature is the world around us, while scientific knowledge is how we organize and describe the world based on observations and inferences.

Question 16

A researcher designs an experiment to test whether a new material is a superconductor. Which part of the scientific method is she engaging in?

Accepted Answer

Testing a hypothesis through experimentation.

Question 17

Which of the following statements about the role of creativity in science is supported by the study materials?

Accepted Answer

Imagination and creativity are important in developing hypotheses, designing experiments, and making inferences.

Question 18

A student measures the current and voltage across a resistor and calculates the resistance using $$R = \frac{V}{I}. If $$the voltage is $$12\ \mathrm{V}$$ and the current is $$3\ \mathrm{A}$$, what is the resistance?

Accepted Answer

$$4\ \Omega$$

Question 19

Which of the following best describes the process by which scientific knowledge becomes widely accepted?

Accepted Answer

Through communication, negotiation, and recognition by other scientists.

Foundations of Scientific Knowledge and the Nature of Science (NoS) in Physics

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