Future grads and adult learners, gear up with our free GED Science quiz that's packed with ged science questions and answers to fuel your success. Dive into this ged science practice test and discover your mastery of biology, chemistry, and physics through engaging ged science practice questions. Whether you're reinforcing key concepts or tackling a full ged test science practice session, you'll gain confidence and track your progress. Ready to put your skills to the ultimate challenge? Explore our ged practice test science or start a quick basic science quiz now and boost your prep instantly!
What is the basic structural and functional unit of all living organisms?
Molecule
Atom
Cell
Organ
All living organisms are composed of cells, which perform the essential processes of life, including metabolism and reproduction. Cells are often called the 'building blocks of life' because they provide structure and function in organisms. This concept is fundamental in biology and is supported by cell theory. Learn more about cells.
Which gas makes up approximately 78% of Earth's atmosphere by volume?
Hydrogen
Oxygen
Nitrogen
Carbon dioxide
Nitrogen is the most abundant gas in Earth's atmosphere, accounting for about 78% by volume. Oxygen is the second most abundant at roughly 21%, while other gases like argon and carbon dioxide make up the remainder. This composition is critical for supporting life and climate processes. Read more about atmospheric composition.
Water has the chemical formula H2O. How many hydrogen atoms are present in one molecule of water?
4
3
2
1
The formula H2O indicates that each water molecule contains two hydrogen atoms and one oxygen atom. The subscript '2' after H specifies the number of hydrogen atoms bonded to oxygen. Understanding molecular formulas is essential in chemistry. Explore water's chemistry.
In a chemical reaction, the substances that undergo change are called what?
Reactants
Products
Ions
Catalysts
Reactants are the starting materials in a chemical reaction that are transformed into products. They participate in breaking and forming bonds during the reaction process. Identifying reactants and products is a key step in writing balanced chemical equations. Learn about chemical reactions.
Which force is responsible for pulling objects toward the center of the Earth?
Gravity
Magnetism
Friction
Tension
Gravity is the force of attraction between masses. On Earth, it pulls objects toward the planet's center, giving them weight. This universal force governs planetary orbits and everyday experiences of weight and falling objects. Understand gravity.
What is the pH value of pure water at 25°C on the pH scale?
1
7
14
0
The pH scale ranges from 0 (most acidic) to 14 (most basic), with 7 being neutral. Pure water at 25°C has a neutral pH of 7 because the concentrations of hydrogen and hydroxide ions are equal. pH is a measure of hydrogen ion concentration in a solution. More on the pH scale.
Which organ system helps regulate body temperature and protect against external pathogens?
Integumentary system
Digestive system
Endocrine system
Nervous system
The integumentary system includes the skin, hair, nails, and glands, which serve as a barrier against pathogens and help regulate body temperature through sweating and blood flow. It also plays roles in sensation and vitamin D synthesis. Maintaining skin health is crucial for overall protection. Learn about the integumentary system.
What is the term for the rate at which an object's velocity changes over time?
Acceleration
Speed
Change in velocity
Force per mass
Acceleration is defined as the rate of change of velocity over time (?v/?t). It can involve speeding up, slowing down, or changing direction. Understanding acceleration is fundamental to classical mechanics. More on acceleration.
What is the molecular formula for glucose, a simple sugar used by cells for energy?
CH4
C12H22O11
C2H5OH
C6H12O6
Glucose has the formula C6H12O6, indicating six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. It is a monosaccharide and a primary energy source in cellular respiration. Knowing molecular formulas is key in biochemistry and metabolism studies. Details on glucose.
In Mendelian genetics, what term describes an organism that carries two different alleles for a specific trait?
Heterozygous
Dominant
Homozygous
Recessive
An organism with two different alleles for a trait is heterozygous, meaning one allele may be dominant and the other recessive. This genetic variation contributes to phenotype differences in offspring. Understanding allele interaction is fundamental to inheritance patterns. Learn about heterozygosity.
Which organelle is known as the powerhouse of the cell because it generates most of the cell's supply of ATP?
Golgi apparatus
Ribosome
Nucleus
Mitochondria
Mitochondria convert energy from nutrients into adenosine triphosphate (ATP) through oxidative phosphorylation. They have their own DNA and are crucial for energy metabolism. Cells with high energy demands contain more mitochondria. About mitochondria.
What law states that the pressure of a fixed amount of gas is inversely proportional to its volume at constant temperature?
Boyle's law
Dalton's law
Charles's law
Avogadro's law
Boyle's law (P1V1 = P2V2) describes how pressure increases when volume decreases for a fixed gas at constant temperature. It is a fundamental gas law used in chemistry and physics. Understanding this relationship is key for gas behavior calculations. More on Boyle's law.
Which of the following is an example of a physical change rather than a chemical change?
Rusting iron
Burning wood
Cooking an egg
Melting ice
Melting ice is a physical change because it involves a change of state from solid to liquid without altering the molecular structure of H2O. Chemical changes produce new substances and involve bond rearrangements. Recognizing the difference is essential in chemistry. Learn about physical changes.
In electrical circuits, what is the unit of electrical resistance?
Ampere
Volt
Ohm
Watt
The ohm (?) is the SI unit of electrical resistance, named after physicist Georg Simon Ohm. It measures how much a material opposes the flow of electric current. Resistance is calculated by V = IR in Ohm's law. More on ohm and resistance.
Which part of the brain is primarily responsible for coordination and balance?
Hypothalamus
Cerebellum
Medulla oblongata
Cerebrum
The cerebellum, located under the cerebrum at the back of the skull, manages motor control, coordination, and balance. It integrates sensory information to fine-tune movements. Damage to the cerebellum can lead to uncoordinated movements. Details on cerebellum.
What type of chemical bond is formed when two atoms share one or more pairs of electrons?
Ionic bond
Covalent bond
Hydrogen bond
Metallic bond
A covalent bond involves the sharing of electron pairs between atoms, allowing each atom to achieve a full valence shell. This type of bond is common in organic molecules and many nonmetal compounds. Covalent bonding underlies molecular diversity in chemistry. Learn about covalent bonds.
Which process in the nitrogen cycle converts atmospheric nitrogen into forms usable by plants?
Denitrification
Nitrification
Ammonification
Nitrogen fixation
Nitrogen fixation is the conversion of atmospheric nitrogen (N2) into ammonia (NH3) by bacteria or industrial processes. This ammonia is then available for uptake by plants. It is a critical step in the global nitrogen cycle. About nitrogen fixation.
What optical phenomenon causes a stick partially submerged in water to appear bent at the surface?
Diffraction
Dispersion
Reflection
Refraction
Refraction is the bending of light as it passes from one medium to another with different density, such as air to water. This change in speed causes the stick to appear broken at the water's surface. Refraction is responsible for many optical effects. Explore refraction.
Which law of thermodynamics asserts that energy cannot be created or destroyed, only transformed?
Third law
First law
Second law
Zeroth law
The First Law of Thermodynamics, also known as the law of energy conservation, states that the total energy of an isolated system remains constant. Energy can change forms (e.g., kinetic to thermal) but is neither created nor destroyed. This principle is foundational in physics and engineering. More on the First Law.
At sea level under standard conditions, what is the boiling point of water in degrees Celsius?
90°C
0°C
212°C
100°C
Water boils at 100°C (212°F) at 1 atmosphere of pressure (sea level) because vapor pressure equals atmospheric pressure. The boiling point varies with altitude and purity of the water. This property is fundamental in thermodynamics and cooking. Boiling point details.
Which stage of cellular respiration generates the majority of ATP molecules in aerobic organisms?
Fermentation
Citric acid cycle
Glycolysis
Oxidative phosphorylation
Oxidative phosphorylation, occurring in the mitochondria, produces the most ATP by using the electron transport chain and chemiosmosis. It follows glycolysis and the citric acid cycle and requires oxygen as the final electron acceptor. This process yields about 26 - 28 ATP per glucose molecule. Learn about oxidative phosphorylation.
In genetics, what term refers to the observable characteristics or traits of an organism?
Phenotype
Chromatid
Allele
Genotype
Phenotype describes the physical appearance or biochemical characteristics of an organism as determined by both genetic makeup and environmental influences. It contrasts with genotype, which refers to the genetic code itself. Phenotypic expression is central to the study of heredity. More on phenotype.
In an exergonic reaction, how is the change in Gibbs free energy (?G) characterized?
?G is negative
?G is positive
?G equals zero
?G is always increasing
Exergonic reactions release energy, which means the change in Gibbs free energy (?G) is negative. A negative ?G indicates that the process can occur spontaneously under constant temperature and pressure. This concept is key in understanding biochemical and physical reactions. About exergonic reactions.
Which ecological term describes a species that has a disproportionately large impact on its environment relative to its abundance?
Invasive species
Indicator species
Pioneer species
Keystone species
A keystone species plays a critical role in maintaining the structure of an ecosystem, affecting other organisms and environmental conditions disproportionately to its abundance. Removal of a keystone species can lead to dramatic shifts in community composition. This concept is crucial in ecology and conservation biology. Learn about keystone species.
A 2 kg object is moving at 3 m/s. What is its kinetic energy in joules?
18 J
6 J
9 J
27 J
Kinetic energy (KE) is calculated by the equation KE = ½mv². Substituting m = 2 kg and v = 3 m/s gives KE = 0.5 × 2 × 9 = 9 joules. This formula is fundamental in classical mechanics. More on kinetic energy.
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Study Outcomes
Understand Core Scientific Concepts -
Grasp fundamental principles in biology, chemistry, and physics to build a solid foundation for GED Science exam topics.
Apply Problem-Solving Strategies -
Use proven techniques to tackle ged science practice questions efficiently and accurately during the free GED Science quiz.
Analyze Your Performance -
Review your quiz answers to identify strengths and areas needing improvement, guiding your focused study plan.
Distinguish Scientific Variables -
Differentiate between independent, dependent, and controlled variables in ged test science practice scenarios.
Evaluate Exam Readiness -
Assess your preparedness for the GED Science exam by comparing your quiz results against target benchmarks.
Implement Test-Taking Techniques -
Adopt time-management strategies and critical-reading skills to maximize success on ged science questions and answers.
Cheat Sheet
Master the Scientific Method -
When tackling ged science questions and answers, recall the five steps: question, hypothesis, experiment, analysis, and conclusion. A simple mnemonic like "QHEAC" or "Queen Helen Eats All Cucumber" can help you remember the sequence. Classifying variables and controls, as outlined by the National Science Teaching Association, is key to acing your ged science practice test scenarios.
Cell Structure & Function Fundamentals -
Understanding organelles such as the nucleus, mitochondria, and ribosomes is vital for ged science practice questions in biology. Remember "Little Man" to recall cell parts: Lysosome, Mitochondria, Endoplasmic reticulum, and Membrane. Reviewing diagrams from reputable sources like Khan Academy ensures you can identify structures under exam conditions.
Chemical Reactions & Equation Balancing -
In a free ged science quiz, you'll often need to balance equations by adjusting coefficients - remember that atoms are conserved on both sides. Practice with the formula H2 + O2 → H2O by setting coefficients to 2H2 + O2 → 2H2O until it balances. The American Chemical Society recommends practicing diverse reaction types, including synthesis and decomposition, for ged science questions and answers mastery.
Newton's Laws & Energy Conservation -
Apply F=ma for force, where F is force in newtons, m is mass in kilograms, and a is acceleration in m/s2, to solve ged test science practice problems involving motion. Learn the first law (inertia), second law (F=ma), and third law ("every action has an equal and opposite reaction") through real-world examples like car seatbelts and rocket launches. Reviewing interactive simulations from NASA can boost your intuition for energy transfer and momentum conservation.
Ecosystems & Human Impact -
Grasp the flow of energy through trophic levels - producers, consumers, and decomposers - to answer ecology questions on the GED. Use the mnemonic "PCD" or picture a Pyramid Chart Diagram to remember order and energy loss (~10% between levels). Resources from the Environmental Protection Agency can provide authentic data for interpreting charts on pollution, biodiversity, and sustainability in a ged science practice test.
