Science Quiz

Take a free online science quiz with physics, chemistry and biology questions. Multiple-choice answers, hints, lifelines and instant results.

The science quiz covers physics, chemistry, biology and the human body, from units and laws of motion to elements, cells and diseases. The questions suit students revising for exams as well as anyone who enjoys science trivia.

How to play the Science Quiz

1. Sign in and start the quiz. You get 15 random questions from a bank of 241.
2. Choose one of four options for each question, or skip it and move on.
3. Use lifelines when you are stuck: Hint, 50/50, Audience poll and Change question.
4. See your score at the end and find all your results in your profile.

Sample Science questions with answers

1. What does DNA stand for?

   • Deoxyribogenetic Atoms
   • Deoxyribogenetic Acid
   • Deoxyribonucleic Acid
   • Detoxic Acid

   Answer: Deoxyribonucleic Acid

2. What is the primary addictive substance found in tobacco?

   • Nicotine
   • Glaucine
   • Ephedrine
   • Cathinone

   Answer: Nicotine

3. Which noble gas has the lowest atomic number?

   • Argon
   • Krypton
   • Helium
   • Neon

   Answer: Helium

4. Which chemical element was originally known as Alabamine?

   • Selenium
   • Antimony
   • Molybdenum
   • Astatine

   Answer: Astatine

5. On which mission did the Space Shuttle Columbia break up upon re-entry?

   • STS-51-L
   • STS-61-C
   • STS-107
   • STS-109

   Answer: STS-107

6. Which color cannot be produced in Roses, even through genetic alteration?

   • Black
   • Orange
   • Blue
   • Brown

   Answer: Blue

7. Which planet in the Solar System is the closest to the Sun?

   • Mars
   • Earth
   • Venus
   • Mercury

   Answer: Mercury

8. Down Syndrome is usually caused by an extra copy of which chromosome?

   • 21
   • 24
   • 23
   • 15

   Answer: 21

9. What does the scientific name of the Cambrian-Period sea creature Anomalocaris mean?

   • Deformed Fish
   • Strange Crab
   • Anomalous Clam
   • Abnormal Shrimp

   Answer: Abnormal Shrimp

10. How many protons are in an oxygen atom?

    • Six
    • Eight
    • Four
    • Two

    Answer: Eight

Frequently asked questions

How many questions are in the Science Quiz?

Each round has 15 multiple-choice questions picked at random from 241 Science questions, so every attempt is different.

Is the Science Quiz free?

Yes, it is free to play. Sign in to start the quiz, and your scores are saved to your Thinkmad profile.

What lifelines can I use?

When you are stuck you can ask for a hint, use 50/50 to remove two wrong answers, check the audience poll, or change the question.

Can I see the correct answers?

Yes. After you answer, the quiz shows the correct option, and your final score lists how many answers were correct, wrong or skipped.