32 Challenging 5th Grade Science Trivia Questions and Answers

Reviewed by Darwin, Author·Updated Aug 2025·4 min read

Explore the wonders of the natural world with this engaging collection of 5th Grade Science trivia. From fascinating facts about space and the human body to earth science, ecosystems, and chemistry basics, these questions are perfect for curious minds. Whether you're a student, teacher, or lifelong learner, this trivia will challenge and inspire you.

1What is the most abundant gas in the Earth’s atmosphere?
2Which planet is known as the “Red Planet”?
3What element does the chemical symbol “O” represent?
4How many bones are there in the adult human body?
5What is the boiling point of water at sea level in degrees Celsius?
6Which is the largest ocean on Earth?
7What is the longest river in the world?
8Which country has the most natural lakes?
9What is the smallest country in the world by land area?
10Which continent is known as the “birthplace of humanity”?
11Who was the first President of the United States?
12What ancient civilization built the pyramids?
13In which year did the Titanic sink?
14What was the first successful vaccine developed for?
15Who wrote the Declaration of Independence?
16What is the largest mammal in the world?
17Which bird is known for its ability to mimic human speech?
18What is the fastest land animal?
19Which tree is known for having the longest lifespan?
20What is the only species of big cat that can’t roar?
21What is the hardest natural substance on Earth?
22What is the most spoken language in the world by native speakers?
23Which famous scientist developed the theory of general relativity?
24What is the chemical formula for table salt?
25Which organ in the human body is primarily responsible for detoxifying chemicals and metabolizing drugs?
26What is the most abundant mineral in the human body?
27Which invention is Thomas Edison most famous for?
28How many teeth does an adult human normally have?
29What gas do plants primarily absorb from the atmosphere?
30What is the hardest rock type?
31What part of the human eye is responsible for controlling the amount of light that enters?
32Which metal has the highest melting point?