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A science test with 15 medium-level questions and answers covering genetics, chemistry, physics and Earth science.
1. Which force keeps planets in orbit around the sun?
💡 Gravity is the attractive force that keeps planets bound in orbit around the sun.
2. What is the term for the variety of living species found in a particular ecosystem?
💡 Biodiversity refers to the variety of life, including species, genetic, and ecosystem diversity, in a given area.
3. What is the term for an organism that can produce its own food using sunlight?
💡 Autotrophs, like plants, produce their own food through photosynthesis rather than consuming other organisms.
4. What is the term for a substance that cannot be chemically broken down into simpler substances?
💡 An element consists of only one type of atom and cannot be broken down further by chemical means.
5. What is the process by which rocks are broken down by wind, water, or ice called?
💡 Weathering breaks down rocks in place, while erosion transports the resulting particles elsewhere.
6. Which part of the human ear is primarily responsible for maintaining balance?
💡 The semicircular canals in the inner ear detect rotational movement and help the body maintain balance.
7. Which gas makes up the majority of the sun's composition?
💡 The sun is composed primarily of hydrogen, which it fuses into helium to produce energy.
8. What is the name of the hormone that regulates blood sugar levels?
💡 Insulin, produced by the pancreas, helps cells absorb glucose from the blood to regulate blood sugar levels.
9. What is the name of the galaxy that contains our solar system?
💡 Our solar system resides within the Milky Way, a large barred spiral galaxy.
10. Which planet rotates almost perpendicular to its orbit, essentially spinning on its side?
💡 Uranus has an axial tilt of about 98 degrees, causing it to roll along its orbit rather than spin upright.
11. Which human body system is primarily responsible for producing hormones?
💡 The endocrine system consists of glands that release hormones directly into the bloodstream to regulate body functions.
12. What is the SI unit used to measure energy?
💡 The joule is the SI unit of energy, named after physicist James Prescott Joule.
13. Which element has the chemical symbol 'K'?
💡 Potassium's chemical symbol, K, comes from its Latin name 'kalium'.
14. Which subatomic particle carries no electric charge?
💡 Neutrons are electrically neutral particles found in the nucleus of an atom, alongside positively charged protons.
15. What is the process by which water vapor turns into liquid water called?
💡 Condensation occurs when water vapor cools and changes back into liquid water, such as dew forming on grass.