Easy Science Quiz Questions and Answers Online

1. Which sense organ do we use to see?

💡 The eye detects light and allows the brain to interpret images, enabling vision.

2. Which planet is often called Earth's twin due to its similar size?

💡 Venus is close to Earth in size and mass, though its atmosphere and surface conditions are very different.

3. What is the boiling point of water in Celsius?

💡 Water boils at 100°C (212°F) at standard atmospheric pressure.

4. What is the closest star to Earth?

💡 The Sun is by far the closest star to Earth, providing light and heat that sustain life.

5. How many bones are in the adult human body?

💡 The adult human skeleton typically has 206 bones, down from about 270 at birth as some fuse together.

6. What is the process by which plants make their own food called?

💡 Photosynthesis lets plants convert sunlight, water, and carbon dioxide into glucose and oxygen.

7. How many legs does a typical insect have?

💡 Insects have 6 legs, one of the key features that separates them from arachnids, which have 8.

8. What is the chemical symbol for water?

💡 Water is made of two hydrogen atoms and one oxygen atom, giving it the formula H2O.

9. Which gas do humans need to breathe in order to survive?

💡 Oxygen is essential for cellular respiration, which produces the energy our bodies need.

10. Which organ pumps blood throughout the human body?

💡 The heart is a muscular organ that pumps blood through the circulatory system.

11. Which part of a plant mainly absorbs water from the soil?

💡 Roots absorb water and nutrients from the soil and anchor the plant in place.

12. What force pulls objects toward the center of the Earth?

💡 Gravity is the force of attraction that pulls objects toward Earth's center.

13. What do we call water that has frozen solid?

💡 Ice is the solid state of water, forming when temperatures drop to 0°C or below.

14. What is the scientific study of living organisms called?

💡 Biology is the branch of science dedicated to studying living organisms and life processes.

15. Which planet is known as the Red Planet?

💡 Mars appears red due to iron oxide, or rust, covering much of its surface.

Quiz Complete!