I85PREP
⌘ K
BSSE General Science 1430 study materials
BSSE General Science 1430 study resources

BSSE General Science 1430 practice questions

One question at a time. Build your BSSE General Science 1430 understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Scientific Inquiry, Measurement, and the Nature of Science

A scientist measures the same metal block five times and obtains values that cluster tightly around 8.91 g/cm³, but the accepted value is 7.87 g/cm³. Which statement best describes these measurements?

  1. They are neither accurate nor precise.
  2. They are accurate but not precise.
  3. They are both accurate and precise.
  4. They are precise but not accurate. Correct answer.

Explanation

Precision describes how closely repeated measurements agree with one another, while accuracy describes how close a measurement is to the true or accepted value. Here the values cluster tightly together, which shows high precision, yet they sit far from 7.87 g/cm³, which shows low accuracy. A systematic error such as an uncalibrated instrument typically produces this pattern.

Question 2Scientific Inquiry, Measurement, and the Nature of Science

Which of the following is an example of a scientific hypothesis stated in testable form?

  1. Everyone should grow basil because it smells pleasant.
  2. Basil plants are the most beautiful plants in any garden.
  3. Basil is better than oregano for cooking.
  4. If basil plants receive more than six hours of sunlight daily, then they will grow taller than plants receiving less. Correct answer.

Explanation

A testable hypothesis makes a specific, falsifiable prediction that connects a manipulated variable to a measurable outcome. The sunlight statement names a variable to change and a measurable result to observe, so an experiment could confirm or refute it. The other statements express aesthetic or value judgments that no measurement could settle.

Question 3Scientific Inquiry, Measurement, and the Nature of Science

A student records the length of a pencil as 14.25 cm using a ruler marked in millimeters. How many significant figures does this measurement have?

  1. 3
  2. 2
  3. 4 Correct answer.
  4. 5

Explanation

All nonzero digits in a measurement are significant, so 1, 4, 2, and 5 all count. A ruler marked in millimeters allows estimation to one-tenth of a millimeter, which justifies reporting the digit in the hundredths place. The measurement therefore has four significant figures.

Question 4Scientific Inquiry, Measurement, and the Nature of Science

In a controlled experiment testing how fertilizer affects plant height, which variable is the independent variable?

  1. The type of soil used
  2. The amount of fertilizer applied Correct answer.
  3. The amount of water given
  4. The height of the plants

Explanation

The independent variable is the factor the experimenter deliberately changes to observe its effect. Here the fertilizer amount is manipulated, while plant height is the dependent variable that responds. Soil type and water are held constant as controlled variables so they do not confound the result.

Question 5Scientific Inquiry, Measurement, and the Nature of Science

Which SI base unit is used to express the amount of a substance in chemistry?

  1. Mole Correct answer.
  2. Candela
  3. Ampere
  4. Kelvin

Explanation

The mole is the SI base unit for amount of substance and represents a fixed number of elementary entities. Kelvin measures thermodynamic temperature, the ampere measures electric current, and the candela measures luminous intensity. Each base unit corresponds to a distinct physical quantity.

Question 6Scientific Inquiry, Measurement, and the Nature of Science

Which statement best describes the role of peer review in the scientific process?

  1. It is a step in which authors edit their manuscript for spelling and grammar.
  2. It guarantees that a published result is permanently correct.
  3. It replaces the need for repeating an experiment.
  4. Independent experts evaluate whether the methods and reasoning support the reported conclusions. Correct answer.

Explanation

Peer review asks qualified, independent researchers to scrutinize a study's design, evidence, and interpretation before publication. It is a quality filter, not a guarantee, because later evidence can overturn accepted findings. Replication remains essential because review cannot by itself confirm that a result is reliable.

Question 7Scientific Inquiry, Measurement, and the Nature of Science

A thermometer reads 23.4 °C, 23.5 °C, and 23.4 °C on three trials. Which quantity do these readings most directly demonstrate?

  1. Low resolution
  2. A large systematic error
  3. High precision Correct answer.
  4. High accuracy

Explanation

Precision refers to the closeness of repeated measurements to one another, and these three readings differ by only 0.1 °C. Without knowing the true temperature, accuracy cannot be judged from the readings alone. Consistency across trials is the defining evidence of precision.

Question 8Scientific Inquiry, Measurement, and the Nature of Science

A researcher wants to determine whether a new drug lowers blood pressure. Which design most effectively tests this claim?

  1. A single case study of one patient taking the drug
  2. A survey asking patients whether they feel healthier
  3. A comparison of volunteers taking the drug with volunteers who refused it
  4. A randomized controlled trial comparing the drug with a placebo Correct answer.

Explanation

A randomized controlled trial assigns participants randomly to treatment and placebo groups, which balances confounding factors and allows a causal conclusion. The placebo control accounts for expectation effects. Designs without random assignment or a control cannot separate the drug's effect from other influences.

Question 9Scientific Inquiry, Measurement, and the Nature of Science

A sample of a powder has a mass of 12.6 g and a volume of 4.0 cm³. What is its density, expressed with the correct number of significant figures?

  1. 3.150 g/cm³
  2. 3.2 g/cm³ Correct answer.
  3. 3.15 g/cm³
  4. 3 g/cm³

Explanation

Density equals mass divided by volume, so 12.6 g ÷ 4.0 cm³ = 3.15 g/cm³ before rounding. In multiplication and division, the result carries the same number of significant figures as the least precise input, which here is two. Rounding 3.15 to two significant figures gives 3.2 g/cm³.

Question 10Scientific Inquiry, Measurement, and the Nature of Science

A student converts 250 milligrams to grams. Which result is correct?

  1. 25.0 g
  2. 0.0250 g
  3. 2.50 g
  4. 0.250 g Correct answer.

Explanation

One gram equals 1000 milligrams, so converting milligrams to grams requires dividing by 1000. Dividing 250 by 1000 moves the decimal three places left, giving 0.250 g. Checking the direction confirms that a gram is the larger unit, so the number must become smaller.

Question 11Scientific Inquiry, Measurement, and the Nature of Science

A botanist notices that plants near a window grow toward the light and asks why this happens. Which term best describes this initial step of the investigation?

  1. Formulating a question from an observation Correct answer.
  2. Drawing a conclusion
  3. Analyzing data
  4. Communicating results

Explanation

Scientific inquiry often begins when an observation prompts a question about the natural world. The botanist has observed a pattern and framed a question, which precedes forming a hypothesis and designing a test. Data analysis, conclusions, and communication come later in the process.

Question 12Scientific Inquiry, Measurement, and the Nature of Science

Two students measure the mass of the same object. Student A reports 45.2 g, and Student B reports 45.20 g. Which statement about these reports is most defensible?

  1. Both reports describe exactly the same instrument precision.
  2. Student B's report implies measurement to a hundredth of a gram, which requires an instrument capable of that precision. Correct answer.
  3. Student B's extra zero is never significant.
  4. Student A's report must be wrong because fewer digits are always less accurate.

Explanation

The number of recorded digits should reflect the precision of the measuring instrument, since the last digit is an estimate. Reporting 45.20 g claims resolution to 0.01 g, which is only justified if the balance can resolve that amount. Adding digits without a finer instrument overstates the reliability of the measurement.

Question 13Scientific Inquiry, Measurement, and the Nature of Science

A scientist repeats an experiment several times and obtains nearly identical results each time. Which conclusion is best supported by this outcome?

  1. The hypothesis has been proven true beyond any doubt.
  2. The measurements must be accurate as well as precise.
  3. The experiment no longer needs to be replicated by others.
  4. The findings are reliable and consistent, though a systematic error could still be present. Correct answer.

Explanation

Replication producing consistent results supports reliability, meaning the outcome is repeatable. However, a systematic error could shift every trial in the same direction, so consistency alone does not establish accuracy. Science also never proves a hypothesis beyond all doubt, since future evidence may require revision.

Question 14Scientific Inquiry, Measurement, and the Nature of Science

A graph plots distance traveled on the vertical axis against time on the horizontal axis, producing a straight line through the origin. What does the slope of this line represent?

  1. Acceleration
  2. Time elapsed
  3. Total distance
  4. Speed Correct answer.

Explanation

Slope equals the change in the vertical quantity divided by the change in the horizontal quantity. Dividing a change in distance by a change in time yields speed. A straight line through the origin indicates constant speed, since the slope does not vary.

Question 15Scientific Inquiry, Measurement, and the Nature of Science

A researcher measures the boiling point of a liquid and reports 78.4 °C ± 0.2 °C. What does the ± 0.2 °C indicate?

  1. That the measurement has no significant figures
  2. That the true value is definitely 78.6 °C
  3. That the instrument is broken
  4. The estimated uncertainty in the measurement Correct answer.

Explanation

The plus-or-minus term states the estimated uncertainty, expressing the range within which the true value likely lies. It reflects limits of instrument resolution and technique rather than a guaranteed error. Reporting uncertainty allows others to judge how much confidence the measurement deserves.

Question 16Scientific Inquiry, Measurement, and the Nature of Science

A study finds that students who eat breakfast score higher on a test. Which statement about this finding is most scientifically cautious?

  1. Breakfast has no relationship to test performance.
  2. Eating breakfast causes higher test scores in all students.
  3. The result is correlational, so other factors such as study habits may explain the difference. Correct answer.
  4. The study proves that skipping breakfast lowers intelligence.

Explanation

An observed association without random assignment or control of confounders establishes correlation, not causation. Factors such as sleep, income, or study habits could influence both breakfast habits and test scores. A cautious interpretation acknowledges these alternative explanations and calls for controlled studies.

Question 17Scientific Inquiry, Measurement, and the Nature of Science

A student uses a balance that consistently reads 0.5 g too high for every object measured. What type of error is this, and how does it affect results?

  1. A systematic error that shifts all readings in the same direction Correct answer.
  2. A human error that cannot be corrected
  3. A rounding error caused by significant figures
  4. A random error that averages out over many trials

Explanation

A systematic error is a consistent bias that affects every measurement in the same direction, often from instrument calibration. Because the offset is constant, averaging repeated trials will not remove it. Calibrating or zeroing the balance is the appropriate correction.

Question 18Scientific Inquiry, Measurement, and the Nature of Science

A theory in science is best characterized in which way?

  1. An opinion held by a majority of scientists
  2. A well-tested explanatory framework supported by extensive evidence Correct answer.
  3. A tentative guess awaiting its first experiment
  4. A proven fact that can never be revised

Explanation

In science, a theory is a broad explanation that has survived repeated testing and organizes many observations. It differs from a hypothesis, which is a testable prediction made before investigation. Theories remain open to revision if new evidence demands it, which is a strength rather than a weakness.

Question 19Scientific Inquiry, Measurement, and the Nature of Science

A researcher calculates the mean of five measurements as 4.36 and must report it with the uncertainty of ± 0.1. Which reported value best follows conventions for significant figures?

  1. 4.360
  2. 4
  3. 4.4 Correct answer.
  4. 4.36

Explanation

The reported value should not claim more decimal precision than the uncertainty provides. Because the uncertainty is in the tenths place, the mean should be rounded to the tenths place as well. Reporting 4.4 matches the precision implied by ± 0.1.

Question 20Scientific Inquiry, Measurement, and the Nature of Science

Two labs test the same hypothesis. Lab A uses a large random sample and finds a small effect; Lab B uses a small convenience sample and finds a large effect. Which result generally provides stronger evidence, and why?

  1. Lab A's result, because a large random sample reduces sampling bias and chance variation Correct answer.
  2. Lab B's result, because a larger effect is always more meaningful
  3. Lab B's result, because small samples are easier to control
  4. Neither result, because a single study can never provide evidence

Explanation

Random sampling reduces bias by making the sample more representative of the population, and larger samples reduce the influence of chance variation. A large effect from a small convenience sample may be inflated by selection bias or random fluctuation. Effect size alone does not establish the strength of evidence without sound sampling.

Question 21Matter, Atomic Structure, and Chemical Reactions

Which subatomic particle carries a negative electrical charge?

  1. Proton
  2. Electron Correct answer.
  3. Alpha particle
  4. Neutron

Explanation

Electrons are the negatively charged particles found outside the nucleus, and their charge balances the positive protons in a neutral atom. Protons are positive and neutrons are uncharged, so neither can supply the negative charge.

Question 22Matter, Atomic Structure, and Chemical Reactions

In the periodic table, elements in the same vertical column share which property?

  1. The same physical state at room temperature
  2. The same number of valence electrons Correct answer.
  3. The same atomic mass
  4. The same number of neutrons

Explanation

A vertical column is a group, and elements in a group have identical valence-electron counts, which is why they show similar bonding behaviour. Atomic mass, neutron number, and physical state all vary within a group.

Question 23Matter, Atomic Structure, and Chemical Reactions

A solid is heated until it melts. Which change describes this transition?

  1. Gas to solid
  2. Liquid to gas
  3. Solid to gas
  4. Solid to liquid Correct answer.

Explanation

Melting is the phase change in which a solid absorbs energy and becomes a liquid. The other transitions describe vaporisation, deposition, and sublimation respectively.

Question 24Matter, Atomic Structure, and Chemical Reactions

Which of the following is a chemical change rather than a physical change?

  1. Iron rusting in moist air Correct answer.
  2. Ice melting on a warm day
  3. Glass shattering on impact
  4. Sugar dissolving in water

Explanation

Rusting produces a new substance, hydrated iron oxide, whose composition differs from the original metal, so it is a chemical change. The other examples alter only shape or physical state while the substance itself is unchanged.

Question 25Matter, Atomic Structure, and Chemical Reactions

How many protons does a neutral atom of carbon-14 contain?

  1. 8
  2. 6 Correct answer.
  3. 14
  4. 12

Explanation

The element identity is set by the atomic number, which is six for carbon, so every carbon atom has six protons. The mass number 14 reflects six protons plus eight neutrons, not the proton count.

Question 26Matter, Atomic Structure, and Chemical Reactions

Which statement correctly describes a covalent bond?

  1. A hydrogen nucleus is shared between molecules
  2. A metal atom donates electrons to a nonmetal
  3. Two ions attract each other electrostatically
  4. Two atoms share a pair of electrons Correct answer.

Explanation

A covalent bond forms when two atoms share one or more pairs of electrons, typically between nonmetals. Electron donation to a nonmetal describes ionic bonding, and electrostatic attraction between ions is the ionic interaction itself.

Question 27Matter, Atomic Structure, and Chemical Reactions

Which of these substances is an element?

  1. Carbon dioxide
  2. Copper Correct answer.
  3. Sodium chloride
  4. Water

Explanation

An element consists of only one kind of atom, and copper metal contains only copper atoms. Water, carbon dioxide, and sodium chloride each contain two different elements combined.

Question 28Matter, Atomic Structure, and Chemical Reactions

What is the molar mass of water, H2O, using H = 1 g/mol and O = 16 g/mol?

  1. 16 g/mol
  2. 20 g/mol
  3. 17 g/mol
  4. 18 g/mol Correct answer.

Explanation

Molar mass is the sum of the atomic masses of all atoms in the formula: two hydrogens contribute 2 g/mol and one oxygen contributes 16 g/mol, giving 18 g/mol.

Question 29Matter, Atomic Structure, and Chemical Reactions

How many moles are present in 36 g of carbon, given a molar mass of 12 g/mol?

  1. 0.33 mol
  2. 24 mol
  3. 3 mol Correct answer.
  4. 12 mol

Explanation

Moles equal mass divided by molar mass, so 36 g divided by 12 g/mol gives 3 mol. Dividing in the wrong direction or using the mass directly leads to the other values.

Question 30Matter, Atomic Structure, and Chemical Reactions

Which equation is correctly balanced?

  1. 2H2 + O2 -> 2H2O Correct answer.
  2. H2 + O2 -> H2O
  3. 2H2 + 2O2 -> 2H2O
  4. H2 + O2 -> H2O2

Explanation

Balancing requires equal numbers of each atom on both sides. In 2H2 + O2 -> 2H2O there are four hydrogen atoms and two oxygen atoms on each side, satisfying conservation of mass.

Question 31Matter, Atomic Structure, and Chemical Reactions

A compound contains 40% calcium, 12% carbon, and 48% oxygen by mass. What is its empirical formula? (Ca = 40, C = 12, O = 16)

  1. CaCO2
  2. CaC2O3
  3. Ca2CO3
  4. CaCO3 Correct answer.

Explanation

Dividing each percentage by its atomic mass gives 1 mol Ca, 1 mol C, and 3 mol O, so the simplest whole-number ratio is CaCO3. Any other formula changes the ratio of atoms away from 1:1:3.

Question 32Matter, Atomic Structure, and Chemical Reactions

Which observation indicates that a chemical reaction has occurred?

  1. A crystal is ground into powder
  2. A solid dissolves and the liquid clears
  3. A liquid is warmed gently
  4. A gas is produced with a new odour Correct answer.

Explanation

Formation of a gas with a new odour indicates a new substance has been generated, which is the hallmark of a chemical reaction. Dissolving, warming, and grinding are physical processes that do not create new substances.

Question 33Matter, Atomic Structure, and Chemical Reactions

In the reaction Zn + 2HCl -> ZnCl2 + H2, which species is oxidised?

  1. Hydrogen in HCl
  2. Chlorine in HCl
  3. Zinc chloride
  4. Zinc Correct answer.

Explanation

Zinc starts at oxidation state zero and becomes +2 in zinc chloride, so it loses electrons and is oxidised. Hydrogen is reduced from +1 to zero, and chlorine keeps its -1 state throughout.

Question 34Matter, Atomic Structure, and Chemical Reactions

Which type of reaction is represented by AgNO3 + NaCl -> AgCl + NaNO3?

  1. Decomposition
  2. Synthesis
  3. Combustion
  4. Double displacement Correct answer.

Explanation

Two ionic compounds exchange their partner ions, forming a precipitate of silver chloride and soluble sodium nitrate, which is a double displacement. Synthesis and decomposition change the number of substances rather than swapping ions.

Question 35Matter, Atomic Structure, and Chemical Reactions

How many atoms are in 0.5 mol of helium? (Avogadro constant = 6.0 x 10^23 per mol)

  1. 3.0 x 10^23 Correct answer.
  2. 6.0 x 10^23
  3. 1.2 x 10^24
  4. 1.5 x 10^23

Explanation

Multiplying the number of moles by Avogadro constant gives 0.5 x 6.0 x 10^23 = 3.0 x 10^23 atoms. Helium is monatomic, so no extra factor is needed.

Question 36Matter, Atomic Structure, and Chemical Reactions

Which pair of elements would most readily form an ionic compound?

  1. Carbon and hydrogen
  2. Oxygen and nitrogen
  3. Potassium and chlorine Correct answer.
  4. Chlorine and fluorine

Explanation

Ionic bonding typically occurs between a reactive metal with low ionisation energy and a nonmetal with high electron affinity. Potassium is a group 1 metal and chlorine a reactive nonmetal, so electron transfer is favourable.

Question 37Matter, Atomic Structure, and Chemical Reactions

A sample of gas at constant temperature has its volume halved. What happens to its pressure?

  1. It doubles Correct answer.
  2. It stays the same
  3. It halves
  4. It falls to one quarter

Explanation

Boyle's law states that at constant temperature, pressure and volume are inversely proportional. Halving the volume therefore doubles the pressure because the same molecules strike the walls more frequently.

Question 38Matter, Atomic Structure, and Chemical Reactions

Which isotope notation correctly represents an atom with 11 protons, 12 neutrons, and 11 electrons?

  1. 12/11 Na
  2. 23/12 Na
  3. 11/12 Na
  4. 23/11 Na Correct answer.

Explanation

In isotope notation the mass number is written as a superscript and the atomic number as a subscript before the symbol. Protons plus neutrons give a mass number of 23, and 11 protons identifies sodium.

Question 39Matter, Atomic Structure, and Chemical Reactions

Why does the first ionisation energy generally increase across a period from left to right?

  1. Atomic radius increases steadily
  2. The number of electron shells increases
  3. Nuclear charge rises while the outer electron stays in the same shell Correct answer.
  4. Shielding by inner electrons increases sharply

Explanation

Across a period, protons are added while the outer electrons occupy the same shell, so the effective nuclear charge felt by the outer electron grows. More attraction means more energy is needed to remove that electron.

Question 40Matter, Atomic Structure, and Chemical Reactions

A 2.0 mol/L solution is diluted by adding solvent until the volume is four times the original. What is the new concentration?

  1. 0.25 mol/L
  2. 8.0 mol/L
  3. 0.50 mol/L Correct answer.
  4. 1.0 mol/L

Explanation

Dilution conserves the number of moles, so concentration falls in proportion to the increase in volume. Quadrupling the volume divides 2.0 mol/L by four, giving 0.50 mol/L.

Question 41Matter, Atomic Structure, and Chemical Reactions

In the reaction N2 + 3H2 -> 2NH3, 1.0 mol of nitrogen reacts with 4.0 mol of hydrogen. Which reactant limits the yield of ammonia?

  1. Nitrogen Correct answer.
  2. Hydrogen
  3. Both reactants are exactly consumed
  4. Neither reactant limits the yield

Explanation

The stoichiometric ratio is one mole of nitrogen to three moles of hydrogen. The available 4.0 mol of hydrogen would require 1.33 mol of nitrogen, but only 1.0 mol is present, so nitrogen runs out first and limits the product.

Question 42Matter, Atomic Structure, and Chemical Reactions

An atom emits a photon when an electron moves from a higher to a lower energy level. Which statement explains this emission?

  1. The photon energy depends only on the nuclear mass
  2. The photon energy equals the sum of the two level energies
  3. The photon energy equals the difference between the two levels Correct answer.
  4. The photon energy equals the total energy of the lower level

Explanation

Each energy level has a fixed energy, and the surplus energy released when an electron drops is carried away as a single photon. Conservation of energy requires that photon energy equal the level difference, which is why spectra show discrete lines.

Question 43Matter, Atomic Structure, and Chemical Reactions

A reaction reaches equilibrium in a closed vessel. Which statement is true at equilibrium?

  1. The equilibrium constant changes as the reaction proceeds
  2. Forward and reverse rates are equal and concentrations stay constant Correct answer.
  3. Both forward and reverse reactions have stopped
  4. The concentration of products equals that of reactants

Explanation

Dynamic equilibrium means the forward and reverse reactions continue at identical rates, so net change in concentrations is zero. Concentrations need not be equal, and the equilibrium constant depends only on temperature.

Question 44Matter, Atomic Structure, and Chemical Reactions

A sample of hydrated salt loses 36 g of water on heating, leaving 64 g of anhydrous salt. What is the mass percentage of water in the original hydrate?

  1. 56%
  2. 44%
  3. 64%
  4. 36% Correct answer.

Explanation

The original hydrate mass is 36 g plus 64 g, equal to 100 g, so the water fraction is 36 g out of 100 g, or 36%. Expressing the water mass relative to the anhydrous residue instead gives a misleading figure.

Question 45Forces, Motion, Energy, and Waves

A cyclist travels 120 m in 15 s at a steady speed. What is the cyclist's speed?

  1. 8 m/s Correct answer.
  2. 9 m/s
  3. 12 m/s
  4. 6 m/s

Explanation

Speed equals distance divided by time, so 120 m divided by 15 s gives 8 m/s. This is the average speed because the distance is covered over that whole interval.

Question 46Forces, Motion, Energy, and Waves

Which quantity is a vector?

  1. Velocity Correct answer.
  2. Distance
  3. Speed
  4. Mass

Explanation

A vector has both magnitude and direction, and velocity specifies how fast and in which direction an object moves. Speed, distance, and mass are scalars because they have magnitude only.

Question 47Forces, Motion, Energy, and Waves

According to Newton's first law, an object with no net force acting on it will do which of the following?

  1. Always come to rest quickly
  2. Move only in a circle
  3. Accelerate steadily in one direction
  4. Remain at rest or move with constant velocity Correct answer.

Explanation

Newton's first law states that with zero net force an object keeps its current state of motion, meaning rest or uniform velocity in a straight line. Any change in speed or direction requires a net force.

Question 48Forces, Motion, Energy, and Waves

What is the SI unit of energy?

  1. Newton
  2. Pascal
  3. Joule Correct answer.
  4. Watt

Explanation

The joule is the SI unit of energy and equals one newton-metre. Newton measures force, watt measures power, and pascal measures pressure.

Question 49Forces, Motion, Energy, and Waves

In a transverse wave, in which direction do the particles of the medium vibrate?

  1. In a spiral around the wave path
  2. Parallel to the wave's direction of travel
  3. Along the wave path but only backwards
  4. Perpendicular to the wave's direction of travel Correct answer.

Explanation

In a transverse wave the oscillations are at right angles to the direction in which the wave energy travels, as with a wave on a string. Longitudinal waves, by contrast, oscillate parallel to the travel direction.

Question 50Forces, Motion, Energy, and Waves

Which of these is a renewable energy source?

  1. Wind Correct answer.
  2. Coal
  3. Petroleum
  4. Natural gas

Explanation

Wind is renewable because it is continuously replenished by natural processes on a human timescale. Coal, natural gas, and petroleum are fossil fuels formed over millions of years and are consumed faster than they form.