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15 questions · Answers with explanations
Science Quiz – Questions & Answers
Test your science knowledge with quiz questions covering biology, physics, chemistry, space, Earth science and everyday science.
Practice set
Science Quiz questions
Work through all fifteen questions at your own pace. Pick an option in your head, then reveal the correct answer and a short explanation. Answers on this page are private and are not added to your Quiz Arena score.
- Question 1 of 15BiologyEasy
Which organ pumps blood around the human body?
- ALiver
- BLung
- CKidney
- DHeart
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Correct Answer: Heart
Explanation: The heart pumps blood through the blood vessels to the rest of the body.
- Question 2 of 15BiologyEasy
What is the basic unit of life?
- ATissue
- BOrgan
- CCell
- DBone
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Correct Answer: Cell
Explanation: The cell is the smallest structural and functional unit of living organisms.
- Question 3 of 15BiologyEasy
Which gas do plants absorb from the atmosphere during photosynthesis?
- AOxygen
- BHelium
- CCarbon dioxide
- DHydrogen
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Correct Answer: Carbon dioxide
Explanation: Plants absorb carbon dioxide from the atmosphere to use in photosynthesis.
- Question 4 of 15PhysicsEasy
Which instrument is used to measure temperature?
- ABarometer
- BThermometer
- CTelescope
- DCompass
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Correct Answer: Thermometer
Explanation: A thermometer is an instrument designed to measure temperature.
- Question 5 of 15PhysicsEasy
What is the SI unit of power?
- AJoule
- BWatt
- CPascal
- DVolt
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Correct Answer: Watt
Explanation: The watt is the SI unit of power and equals one joule of energy transferred per second.
- Question 6 of 15PhysicsEasy
Which instrument measures electric potential difference?
- AAmmeter
- BOhmmeter
- CVoltmeter
- DWattmeter
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Correct Answer: Voltmeter
Explanation: A voltmeter measures the electric potential difference between two points in a circuit.
- Question 7 of 15ChemistryEasy
What state of matter is ice?
- ASolid
- BLiquid
- CGas
- DPlasma
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Correct Answer: Solid
Explanation: Ice is the solid state of water.
- Question 8 of 15ChemistryEasy
Which chemical element has the symbol O?
- AGold
- BOxygen
- CIron
- DCarbon
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Correct Answer: Oxygen
Explanation: O is the chemical symbol for the element oxygen.
- Question 9 of 15ChemistryEasy
What is the chemical symbol for potassium?
- AK
- BP
- CPo
- DPt
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Correct Answer: K
Explanation: Potassium's symbol K comes from the Latin kalium.
- Question 10 of 15Astronomy & SpaceEasy
Which planet is known as the Red Planet?
- AEarth
- BMars
- CJupiter
- DVenus
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Correct Answer: Mars
Explanation: Mars looks red because of iron oxide dust.
- Question 11 of 15Astronomy & SpaceEasy
Who became the first person to walk on the Moon?
- ANeil Armstrong
- BBuzz Aldrin
- CYuri Gagarin
- DJohn Glenn
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Correct Answer: Neil Armstrong
Explanation: Neil Armstrong became the first person to walk on the Moon during the Apollo 11 mission in 1969.
- Question 12 of 15Earth ScienceEasy
In which layer of Earth's atmosphere does most weather occur?
- AStratosphere
- BMesosphere
- CThermosphere
- DTroposphere
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Correct Answer: Troposphere
Explanation: Most clouds, storms, and other weather phenomena occur in the troposphere.
- Question 13 of 15Earth ScienceEasy
Which movement of Earth causes the cycle of day and night?
- AAxial precession
- BRevolution around the Sun
- CRotation on its axis
- DTectonic plate motion
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Correct Answer: Rotation on its axis
Explanation: Earth's rotation on its axis causes different areas to face toward or away from the Sun.
- Question 14 of 15Environment & EcologyEasy
What is the natural home of an organism called?
- ACommunity
- BFood web
- CHabitat
- DPopulation
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Correct Answer: Habitat
Explanation: A habitat is the natural place where an organism lives and obtains the resources it needs.
- Question 15 of 15Environment & EcologyEasy
What are consumers that feed directly on producers called?
- ADecomposers
- BTertiary consumers
- CSecondary consumers
- DPrimary consumers
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Correct Answer: Primary consumers
Explanation: Primary consumers eat producers such as plants and algae and form the second trophic level.
Topics covered
Explore six approved Science subtopics, plus everyday scientific ideas you may encounter outside the classroom.
Why practice science quizzes?
Learn scientific concepts through questions: Use each prompt to recall a fact or connect it with a familiar idea.
Check your understanding: Make your own choice before revealing the stored answer.
Learn from explanations: Every revealed answer includes a short reason or useful context.
Practice different subjects: Move between biology, physics, chemistry, astronomy, Earth science and the environment.
Beginner-friendly learning: This set uses easy questions and has no timer or score pressure.
Practise regularly: Return to short quiz sets whenever you want to revisit science knowledge.
How to play
- 1
Read the science question
Take a moment to understand what is being asked.
- 2
Choose one of four answers
Compare all four options and settle on your best choice.
- 3
Reveal the answer and explanation
Select "Show Answer" to check yourself and read the reason.
Related quiz content
Science Quiz FAQ
What is a Science Quiz?
A Science Quiz is a set of multiple-choice questions that lets you check your understanding of subjects such as biology, physics, chemistry, astronomy, Earth science and the environment.
Is this Science Quiz free?
Yes. This fifteen-question practice set is free to use, and you do not need an account to read the questions or reveal their answers.
What science topics are included?
The questions on this page cover biology, physics, chemistry, space and astronomy, Earth science, the environment and everyday science.
Are the questions suitable for beginners?
Yes. This set uses easy questions, has no timer, and includes a short explanation with every revealed answer.
Can I practice other quizzes on Quiz Arena?
Yes. You can also use the GK Practice Quiz and General Knowledge Quiz pages, or enter the app for optional timed and live quiz modes.
How can I check the correct science answer?
Use the "Show Answer" control below a question to reveal its correct answer and explanation. Use the same control again to hide them.
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