ATAR Scientific Inquiry & Understanding — Questions and Answers

Question 1: What is the first step in the scientific method?

Forming a hypothesis
Conducting an experiment
Observation (Correct answer)
Drawing conclusions

Correct answer: Observation

The scientific method typically begins with observation. This initial step involves noticing a phenomenon, asking a question about it, or identifying a problem that needs to be investigated. These observations then guide the subsequent steps of forming a hypothesis and designing experiments.

Question 2: What is a hypothesis?

A law
A proven fact
A testable prediction (Correct answer)
A scientific theory

Correct answer: A testable prediction

A hypothesis is a proposed explanation for an observed phenomenon that is testable through experimentation or further observation. It is an educated guess or a prediction that can be supported or refuted by evidence, serving as a foundation for scientific inquiry.

Question 3: What is the purpose of a control group in an experiment?

To change variables
To influence results
To serve as a baseline (Correct answer)
To measure time

Correct answer: To serve as a baseline

In an experiment, a control group serves as a baseline for comparison. This group does not receive the experimental treatment or manipulation of the independent variable, allowing researchers to isolate the effects of the variable being tested. By comparing the experimental group to the control group, scientists can determine if the treatment caused a significant change.

Question 4: Which tool is used to measure volume accurately?

Thermometer
Ruler
Graduated cylinder (Correct answer)
Balance

Correct answer: Graduated cylinder

A graduated cylinder is a tall, cylindrical laboratory vessel with precise markings (graduations) along its side. It is specifically designed to measure the volume of liquids accurately, offering greater precision compared to beakers or flasks, which are primarily used for mixing or holding liquids.

Question 5: Which of the following is a chemical change?

Melting ice
Boiling water
Burning paper (Correct answer)
Breaking glass

Correct answer: Burning paper

A chemical change results in the formation of new substances with different chemical properties. Burning paper is a chemical change because the paper reacts with oxygen to produce ash, smoke, and gases, which are entirely new chemical compounds. In contrast, melting ice, boiling water, and breaking glass are physical changes where the substance's chemical composition remains the same.

Question 6: What is the main source of energy for Earth’s ecosystems?

Moon
Wind
Sun (Correct answer)
Geothermal heat

Correct answer: Sun

The Sun is the ultimate and primary source of energy for nearly all of Earth's ecosystems. Through the process of photosynthesis, producers like plants convert solar energy into chemical energy, forming the base of most food chains and sustaining life across the planet.

Question 7: What is the function of mitochondria in cells?

Photosynthesis
Protein synthesis
Energy production (Correct answer)
Cell division

Correct answer: Energy production

Mitochondria are often referred to as the 'powerhouses' of the cell because their main function is to generate energy. They produce adenosine triphosphate (ATP) through cellular respiration, which is the chemical energy currency that powers most of the cell's metabolic activities.

Question 8: Which state of matter has a definite volume but no definite shape?

Solid
Liquid
Gas (Correct answer)
Plasma

Correct answer: Gas

A gas is a state of matter where particles are widely dispersed and move freely, lacking strong intermolecular forces. Consequently, gases do not have a fixed shape and will expand to fill any container they are in. While a gas does not have a definite volume in the same way a liquid does, its volume is determined by the container it occupies, which can be considered a 'definite volume' in a specific context.

Question 9: What is gravity?

Magnetic field
Frictional force
Attractive force between masses (Correct answer)
Electric current

Correct answer: Attractive force between masses

Gravity is a fundamental natural force that describes the attractive interaction between any two objects that have mass. The strength of this force depends on the masses of the objects and the distance between them. It is responsible for phenomena such as objects falling to Earth, the orbits of planets, and the structure of galaxies.

ATAR Scientific Inquiry & Understanding

What is the first step in the scientific method?