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Quizzes > Science > Other Sciences

Test Your Science Knowledge with Our Free Quiz

Ready for a free online science quiz? Challenge yourself now!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration shows science quiz with flasks, beakers, atoms and gears on golden yellow background

Ready to dive into the ultimate free online science quiz? This spirited science quiz is designed to challenge your knowledge, test key concepts, and spark your curiosity. Whether you're brushing up with a quick general science trivia round or tackling a thorough science practice test, you'll engage with an interactive science quiz experience that's both fun and educational. Click through our engaging science trivia quiz to see how fast you can answer, get instant feedback to boost confidence, and then sharpen your skills with targeted science quiz questions that reinforce what you've learned. Perfect for students, enthusiasts, or anyone eager for a brain boost - start acing it today!

What is the chemical symbol for water?
O2
H2O
H2
HO2
Water's chemical formula is H2O, showing two hydrogen atoms bonded to a single oxygen atom. This reflects the molecular composition responsible for its liquid state at room temperature. Other combinations like O2 or H2 do not represent the properties of water. Learn more
Which planet is known as the Red Planet?
Mars
Venus
Mercury
Jupiter
Mars is called the Red Planet due to the iron oxide (rust) on its surface giving it a reddish appearance. It is the fourth planet from the Sun and has been a key target for exploration missions. No other planet shows such a pervasive red coloration. Learn more
What gas do plants absorb from the atmosphere during photosynthesis?
Carbon dioxide
Methane
Nitrogen
Oxygen
Plants take in carbon dioxide (CO2) from the air to produce glucose and oxygen through photosynthesis. The process occurs in chloroplasts using sunlight energy. Oxygen is released as a byproduct rather than being consumed. Learn more
What force pulls objects toward Earth's center?
Friction
Tension
Magnetism
Gravity
Gravity is the force that attracts objects with mass toward one another, and near Earth's surface it pulls objects toward the planet's center. It is described by Newton's law of universal gravitation. Other forces like friction or magnetism act differently and do not account for weight. Learn more
At what temperature does water freeze at sea level in Celsius?
-1°C
32°C
100°C
0°C
At standard atmospheric pressure (sea level), water freezes at 0 degrees Celsius. This is a widely used reference point in temperature scales. 32°C and 100°C are related to Fahrenheit freezing and boiling points respectively, not Celsius. Learn more
What is the primary particle that makes up alpha radiation?
Helium nucleus
Proton
Neutron
Electron
Alpha radiation consists of alpha particles, which are helium nuclei composed of two protons and two neutrons. This makes them relatively heavy and positively charged. They have low penetration power compared to beta or gamma radiation. Learn more
In chemistry, a pH value of 7 indicates what?
Neutral
Saturated
Acidic
Basic
The pH scale ranges from 0 to 14, with 7 considered neutral, meaning equal concentrations of hydrogen and hydroxide ions. Values below 7 indicate acidity, and values above 7 indicate basicity. Neutral pH is important for many biological processes. Learn more
Which organelle is known as the powerhouse of the cell?
Ribosome
Endoplasmic reticulum
Mitochondrion
Nucleus
Mitochondria produce ATP through cellular respiration, supplying energy for cellular activities. They contain their own DNA and double membrane. The nucleus houses genetic material, while ribosomes and the ER have other roles. Learn more
What is the speed of light in a vacuum approximately?
3×10^7 m/s
3×10^8 m/s
3×10^6 m/s
3×10^5 m/s
The speed of light in a vacuum is exactly 299,792,458 meters per second, commonly rounded to 3×10^8 m/s. It is a fundamental constant in physics, denoted by 'c'. Slower speeds like 3×10^6 m/s do not match observations. Learn more
Which of these is a noble gas?
Oxygen
Neon
Nitrogen
Chlorine
Neon is a noble gas found in group 18 of the periodic table, characterized by full valence electron shells. It is inert and rarely forms compounds. Nitrogen and oxygen are diatomic gases but not noble. Learn more
What law relates current, voltage, and resistance in an electrical circuit?
Kirchhoff's Law
Faraday's Law
Ampère's Law
Ohm's Law
Ohm's Law states that V = IR, relating voltage (V), current (I), and resistance (R) in a conductor. Faraday's Law concerns electromagnetic induction, Ampère's deals with magnetic fields from currents, and Kirchhoff's addresses current and voltage in circuits. Learn more
Which element has the highest electronegativity?
Fluorine
Oxygen
Nitrogen
Chlorine
Fluorine has the highest electronegativity of all elements, measured as 3.98 on the Pauling scale. It strongly attracts electrons in a chemical bond. Oxygen and chlorine follow but do not exceed fluorine's value. Learn more
What is the term for organisms that can survive extreme conditions like high temperature?
Mesophiles
Saprophytes
Extremophiles
Autotrophs
Extremophiles are organisms adapted to extreme environments, such as high temperature or acidity. Thermophiles are a subgroup that thrive in hot conditions. Mesophiles prefer moderate temperatures, while autotrophs and saprophytes describe nutritional modes. Learn more
What is the primary reason for the asteroid belt's location between Mars and Jupiter?
Jupiter's strong gravity prevented planet formation
Sun's heat vaporized a planet
Saturn's rings absorbed them
Lack of materials in that region
Jupiter's massive gravity disrupted planetesimal accretion in the region between Mars and Jupiter, preventing a planet from forming. This led to the formation of many smaller bodies we see as the asteroid belt. The Sun's heat and Saturn's rings are not involved in this region's formation. Learn more
In water, what is the approximate angle between hydrogen atoms?
180°
104.5°
120°
90°
The H - O - H bond angle in a water molecule is about 104.5°, due to the two lone pairs on oxygen repelling the hydrogen atoms. This angle deviates from the ideal tetrahedral angle of 109.5°. The bent shape leads to water's polarity. Learn more
Which process converts nitrogen gas into a form usable by plants?
Ammonification
Denitrification
Nitrification
Nitrogen fixation
Nitrogen fixation is the process by which certain bacteria and archaea convert nitrogen gas (N2) into ammonia or related compounds usable by plants. Nitrification and denitrification are other steps in the nitrogen cycle but do not directly fix N2. Learn more
What quantum number determines the shape of an atomic orbital?
Azimuthal quantum number (l)
Spin quantum number (m_s)
Magnetic quantum number (m_l)
Principal quantum number (n)
The azimuthal quantum number (l) defines the shape of an atomic orbital by determining its angular momentum. The principal quantum number (n) indicates the orbital's energy level. The magnetic and spin numbers govern orientation and spin properties. Learn more
What is the paradox that questions why we haven't observed extraterrestrial civilizations despite high probability estimates?
Bootstrap paradox
Fermi paradox
Monty Hall problem
Olbers' paradox
The Fermi paradox highlights the contradiction between the high probability of extraterrestrial life and the lack of evidence for or contact with such civilizations. Olbers' paradox deals with the darkness of the night sky, not aliens. The Monty Hall and bootstrap paradoxes apply to probability and time travel, respectively. Learn more
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Study Outcomes

  1. Recall Key Science Concepts -

    Recall fundamental facts and definitions from biology, chemistry, physics, and earth science to strengthen your general science trivia knowledge.

  2. Apply Scientific Reasoning -

    Apply logical thinking and problem-solving skills to tackle challenging questions in this free online science quiz.

  3. Analyze Data and Scenarios -

    Analyze graphs, experimental setups, and real-world examples to draw accurate conclusions in the science practice test.

  4. Interpret Earth Science Patterns -

    Interpret geological processes and environmental phenomena to deepen your understanding of earth science concepts.

  5. Evaluate Your Quiz Performance -

    Evaluate your results to identify strengths and areas for improvement, boosting your confidence for future assessments.

Cheat Sheet

  1. Cell Structure & Function -

    Review the roles of key organelles like the nucleus, mitochondria, and ribosomes; remember "Mighty Mitochondria" makes energy via cellular respiration (C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP). A free online science quiz often tests differences between prokaryotes and eukaryotes, so recall that prokaryotes lack membrane-bound organelles (NIH, National Center for Biotechnology Information).

  2. Periodic Table & Chemical Bonds -

    Memorize periodic trends: atomic radius decreases across a period and increases down a group, while ionization energy shows the opposite pattern (ACS, American Chemical Society). Use the mnemonic "Alice Begs Charlie For Neon" to remember alkali metals, alkaline earths, chalcogens, halogens, and noble gases.

  3. Newton's Laws of Motion -

    First law: objects in motion stay in motion unless acted on by an external force; second law: F = ma; third law: every action has an equal and opposite reaction (NASA's Physics Classroom). Practice with sample problems, like calculating acceleration when a 5 kg object is pushed with 20 N (a = F/m = 4 m/s²).

  4. Energy Transformations & Conservation -

    Understand that energy cannot be created or destroyed - only transformed (e.g., potential to kinetic in a roller coaster) and calculate changes using KE = ½mv² and PE = mgh (University Physics Textbook). Interactive science quizzes often ask you to identify forms of energy and track energy flow in systems.

  5. Earth Systems & Climate Processes -

    Study the water cycle stages - evaporation, condensation, precipitation - and how greenhouse gases trap heat (NOAA's Climate.gov). Recall "Never Eat Crunchy Cereal Plain" for the five layers of the atmosphere (Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere).

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