Science Practice Test 8 Welcome to your full GED practice test! You’ll face Science section, just like in the real exam. Stay focused and simulate real test conditions. You’ve got this! ⏰ Time’s up! Your responses have been automatically submitted. Check your score and review your mistakes carefully — each test makes you stronger. Science Practice Test 8 1 / 40 Which phenomenon causes ocean tides? A) Earth’s tilt B) The Moon’s gravity C) Solar flares D) Global winds Correct Answer: B Explanation: The Moon’s gravity pulls on Earth’s oceans, creating tides. Correct Answer: B Explanation: The Moon’s gravity pulls on Earth’s oceans, creating tides. 2 / 40 Which organ removes carbon dioxide from the blood? A) Heart B) Kidneys C) Lungs D) Liver Correct Answer: C Explanation: The lungs exchange carbon dioxide for oxygen during breathing. Correct Answer: C Explanation: The lungs exchange carbon dioxide for oxygen during breathing. 3 / 40 Which tool measures liquid volume? A) Beaker B) Thermometer C) Ruler D) Graduated cylinder Correct Answer: D Explanation: A graduated cylinder is marked with precise measurement lines, making it the best tool for measuring liquid volume accurately. Beakers can hold liquids but do not measure volume precisely. Correct Answer: D Explanation: A graduated cylinder is marked with precise measurement lines, making it the best tool for measuring liquid volume accurately. Beakers can hold liquids but do not measure volume precisely. 4 / 40 Which planet is farthest from the Sun? A) Earth B) Uranus C) Neptune D) Saturn Correct Answer: C Explanation: Neptune is the eighth and farthest known planet from the Sun. Correct Answer: C Explanation: Neptune is the eighth and farthest known planet from the Sun. 5 / 40 Earth’s path around the Sun is called its . Check Correct Answer: orbit Explanation: Earth orbits the Sun once every year. Correct Answer: orbit Explanation: Earth orbits the Sun once every year. 6 / 40 The ability to do work or cause change is called . Check Correct Answer: energy Explanation: All forms of energy can cause movement or change. Correct Answer: energy Explanation: All forms of energy can cause movement or change. 7 / 40 The main gas released by burning fossil fuels is . Check Correct Answer: carbon dioxide Explanation: Fossil fuel combustion releases large amounts of carbon dioxide. Correct Answer: carbon dioxide Explanation: Fossil fuel combustion releases large amounts of carbon dioxide. 8 / 40 Energy from the Sun reaches Earth through . Check Correct Answer: radiation Explanation: Radiation travels through space without needing matter. Correct Answer: radiation Explanation: Radiation travels through space without needing matter. 9 / 40 The organelle that makes proteins is the . Check Correct Answer: ribosome Explanation: Ribosomes build proteins needed by the cell. Correct Answer: ribosome Explanation: Ribosomes build proteins needed by the cell. 10 / 40 The phase change from solid directly to gas is called . Check Correct Answer: sublimation Explanation: Sublimation occurs when a solid changes to gas without becoming liquid. Correct Answer: sublimation Explanation: Sublimation occurs when a solid changes to gas without becoming liquid. 11 / 40 Which organisms are decomposers? A) Fungi B) Bacteria C) Snails D) Oak trees Check Correct Answer: A, B Explanation: Decomposers break down dead matter. Snails are consumers; oak trees are producers. FILL IN THE BLANK Correct Answer: A, B Explanation: Decomposers break down dead matter. Snails are consumers; oak trees are producers. FILL IN THE BLANK 12 / 40 Which factors affect climate? A) Distance from the equator B) Height above sea level C) Clothing choices D) Nearby ocean currents Check Correct Answer: A, B, D Explanation: Latitude, altitude, and currents influence climate. Human clothing does not. Correct Answer: A, B, D Explanation: Latitude, altitude, and currents influence climate. Human clothing does not. 13 / 40 Which examples show forms of kinetic energy? A) Moving bicycle B) Flowing river C) Stretched slingshot D) Rolling ball Check Correct Answer: A, B, D Explanation: Kinetic energy is motion. A stretched slingshot stores potential energy. Correct Answer: A, B, D Explanation: Kinetic energy is motion. A stretched slingshot stores potential energy. 14 / 40 Which observations suggest a substance underwent a physical change? A) Change in shape B) Melting C) New odor forms D) Color change Check Correct Answer: A, B Explanation: Physical changes do not create new substances. Odors and color changes may indicate chemical change. Correct Answer: A, B Explanation: Physical changes do not create new substances. Odors and color changes may indicate chemical change. 15 / 40 Which processes occur during the rock cycle? A) Melting B) Cooling C) Erosion D) Photosynthesis Check Correct Answer: A, B, C Explanation: Melting, cooling, and erosion transform rocks. Photosynthesis is unrelated. Correct Answer: A, B, C Explanation: Melting, cooling, and erosion transform rocks. Photosynthesis is unrelated. 16 / 40 Which human actions help reduce carbon emissions? A) Planting trees B) Using public transportation C) Burning more fossil fuels D) Recycling metals Check Correct Answer: A, B, D Explanation: These actions reduce carbon pollution. Burning fuels increases emissions. Correct Answer: A, B, D Explanation: These actions reduce carbon pollution. Burning fuels increases emissions. 17 / 40 Which choices are producers? A) Algae B) Mushrooms C) Pine trees D) Bears Check Correct Answer: A, C Explanation: Producers make their own food through photosynthesis. Mushrooms and bears cannot. Correct Answer: A, C Explanation: Producers make their own food through photosynthesis. Mushrooms and bears cannot. 18 / 40 Which signs show a chemical reaction has taken place? A) Color change B) Formation of a gas C) Cutting into smaller pieces D) Temperature change Check Correct Answer: A, B, D Explanation: Chemical reactions often show heat changes, color changes, and gas formation. Correct Answer: A, B, D Explanation: Chemical reactions often show heat changes, color changes, and gas formation. 19 / 40 Which factors can cause soil erosion? A) Heavy rainfall B) Strong winds C) Thick vegetation D) Ice wedging Check Correct Answer: A, B, D Explanation: Water, wind, and ice can erode soil, while plants help prevent erosion. Correct Answer: A, B, D Explanation: Water, wind, and ice can erode soil, while plants help prevent erosion. 20 / 40 Which items are nonrenewable resources? A) Coal B) Natural gas C) Solar energy D) Wind energy Check Correct Answer: A, B Explanation: Coal and natural gas cannot be replaced quickly. Solar and wind are renewable. Correct Answer: A, B Explanation: Coal and natural gas cannot be replaced quickly. Solar and wind are renewable. 21 / 40 Which statement describes a hypothesis? A) A proven fact B) A testable prediction C) A final conclusion D) An unchangeable rule Correct Answer: B Explanation: A hypothesis predicts what will happen and can be tested through experiments. MULTIPLE SELECT Correct Answer: B Explanation: A hypothesis predicts what will happen and can be tested through experiments. MULTIPLE SELECT 22 / 40 Which layer of Earth is the hottest? A) Crust B) Mantle C) Outer core D) Inner core Correct Answer: D Explanation: The inner core is extremely hot and under great pressure. Correct Answer: D Explanation: The inner core is extremely hot and under great pressure. 23 / 40 Which force keeps objects on Earth’s surface? A) Electricity B) Magnetism C) Friction D) Gravity Correct Answer: D Explanation: Gravity pulls objects toward Earth’s center. Correct Answer: D Explanation: Gravity pulls objects toward Earth’s center. 24 / 40 Which characteristic do all living things share? A) They move from place to place B) They need oxygen C) They reproduce D) They can speak Correct Answer: C Explanation: Reproduction is a universal characteristic of life. Correct Answer: C Explanation: Reproduction is a universal characteristic of life. 25 / 40 What type of energy transformation occurs in a lamp? A) Electrical to light B) Chemical to electrical C) Mechanical to thermal D) Nuclear to mechanical Correct Answer: A Explanation: A lamp transforms electrical energy into light energy. Correct Answer: A Explanation: A lamp transforms electrical energy into light energy. 26 / 40 Which process describes water soaking into the ground? A) Condensation B) Evaporation C) Infiltration D) Runoff Correct Answer: C Explanation: Infiltration is water entering the soil and moving downward. Correct Answer: C Explanation: Infiltration is water entering the soil and moving downward. 27 / 40 What is the main function of red blood cells? A) Defend against disease B) Carry oxygen C) Break down food D) Form blood clots Correct Answer: B Explanation: Red blood cells carry oxygen to tissues throughout the body. Correct Answer: B Explanation: Red blood cells carry oxygen to tissues throughout the body. 28 / 40 Which instrument measures the volume of a liquid? A) Balance B) Graduated cylinder C) Thermometer D) Stopwatch Correct Answer: B Explanation: Graduated cylinders allow accurate liquid volume measurements. Correct Answer: B Explanation: Graduated cylinders allow accurate liquid volume measurements. 29 / 40 Which change is a chemical change? A) Tearing paper B) Melting ice C) Burning wood D) Shaping clay Correct Answer: C Explanation: Burning forms new substances like ash and gases. Correct Answer: C Explanation: Burning forms new substances like ash and gases. 30 / 40 Which human body system transports nutrients and oxygen? A) Immune system B) Circulatory system C) Digestive system D) Endocrine system Correct Answer: B Explanation: Blood vessels carry oxygen and nutrients throughout the body. Correct Answer: B Explanation: Blood vessels carry oxygen and nutrients throughout the body. 31 / 40 Which property of matter describes how tightly packed particles are? A) Mass B) Volume C) Density D) Weight Correct Answer: C Explanation: Density compares mass to volume and tells how compact matter is. Correct Answer: C Explanation: Density compares mass to volume and tells how compact matter is. 32 / 40 Which location receives the least direct sunlight during the year? A) Equator B) Tropics C) Poles D) Mid-latitudes Correct Answer: C Explanation: The poles tilt away from the Sun for much of the year, receiving the least sunlight. Correct Answer: C Explanation: The poles tilt away from the Sun for much of the year, receiving the least sunlight. 33 / 40 Which process is responsible for water droplets forming on the outside of a cold glass? A) Condensation B) Evaporation C) Sublimation D) Fusion Correct Answer: A Explanation: Water vapor in the air cools and condenses on the cold glass. Correct Answer: A Explanation: Water vapor in the air cools and condenses on the cold glass. 34 / 40 Which form of energy does a moving train have? A) Potential energy B) Chemical energy C) Kinetic energy D) Sound energy Correct Answer: C Explanation: A moving object has kinetic energy. Correct Answer: C Explanation: A moving object has kinetic energy. 35 / 40 What is the main cause of volcanic eruptions? A) Ocean currents B) Rising magma C) Weather changes D) Air pressure differences Correct Answer: B Explanation: Magma rises through cracks in Earth’s crust, causing eruptions. Correct Answer: B Explanation: Magma rises through cracks in Earth’s crust, causing eruptions. 36 / 40 Which human body system controls voluntary movements? A) Nervous system B) Digestive system C) Immune system D) Respiratory system Correct Answer: A Explanation: The nervous system sends signals that allow voluntary muscle control. Correct Answer: A Explanation: The nervous system sends signals that allow voluntary muscle control. 37 / 40 Which gas is essential for plant photosynthesis? A) Nitrogen B) Carbon dioxide C) Oxygen D) Helium Correct Answer: B Explanation: Plants use carbon dioxide along with water and sunlight to produce glucose. Correct Answer: B Explanation: Plants use carbon dioxide along with water and sunlight to produce glucose. 38 / 40 What causes wind? A) The Moon’s gravity B) Differences in air pressure C) Earth’s orbit D) Cloud formation Correct Answer: B Explanation: Air moves from high-pressure areas to low-pressure areas, creating wind. Correct Answer: B Explanation: Air moves from high-pressure areas to low-pressure areas, creating wind. 39 / 40 Which type of rock forms from hardened magma beneath Earth’s surface? A) Metamorphic B) Intrusive igneous C) Extrusive igneous D) Sedimentary Correct Answer: B Explanation: Intrusive igneous rocks cool slowly below ground, forming large crystals. Correct Answer: B Explanation: Intrusive igneous rocks cool slowly below ground, forming large crystals. 40 / 40 Which organelle is responsible for packaging and transporting materials within a cell? A) Ribosome B) Golgi apparatus C) Nucleus D) Chloroplast Correct Answer: B Explanation: The Golgi apparatus modifies, sorts, and packages proteins for transport. Correct Answer: B Explanation: The Golgi apparatus modifies, sorts, and packages proteins for transport. Your score isThe average score is 0%