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Test your science knowledge with these moderately challenging questions!
1. Which gas makes up most of Earth's atmosphere?
💡 Nitrogen (N₂) makes up approximately 78% of Earth's atmosphere, followed by oxygen at 21%.
2. What is the name of the process by which cells divide to produce two identical cells?
💡 Mitosis is cell division that produces two genetically identical daughter cells, used for growth and repair.
3. What is the speed of light in a vacuum?
💡 Light travels at approximately 299,792 km/s in a vacuum, often rounded to 300,000 km/s.
4. How many chambers does the human heart have?
💡 The heart has 4 chambers: left atrium, right atrium, left ventricle, and right ventricle.
5. What is the chemical formula for table salt?
💡 Table salt is sodium chloride (NaCl), composed of one sodium atom and one chlorine atom.
6. What part of the cell contains genetic information?
💡 The nucleus contains the cell's DNA and acts as the control center, directing cell activities.
7. What is the half-life of Carbon-14 used in radiocarbon dating?
💡 Carbon-14 has a half-life of approximately 5,730 years, making it useful for dating organic materials up to 50,000 years old.
8. Which blood type is known as the universal donor?
💡 O negative blood can be given to patients of any blood type in emergencies, making it the universal donor.
9. What is the name of the process by which plants lose water through their leaves?
💡 Transpiration is the process by which plants release water vapor through tiny pores called stomata in their leaves.
10. Which type of radiation has the highest penetrating power?
💡 Gamma radiation has the highest penetrating power and requires thick lead or concrete shielding to block it.
11. What is the most abundant element in the universe?
💡 Hydrogen makes up about 75% of all normal matter in the universe by mass.
12. Which planet has the most moons in our solar system?
💡 Saturn has 146 confirmed moons, the most of any planet in our solar system.
13. Which organ produces insulin in the human body?
💡 The pancreas produces insulin, a hormone that regulates blood sugar (glucose) levels in the body.
14. What is the process by which rocks are broken down by weather and environment?
💡 Weathering is the breakdown of rocks by physical, chemical, or biological processes over time.
15. What is the SI unit of force?
💡 The newton (N) is the SI unit of force, defined as the force needed to accelerate 1 kg at 1 m/s².
16. What does DNA stand for?
💡 DNA (Deoxyribonucleic Acid) is the molecule that carries the genetic instructions for all living organisms.
17. What is the name of the layer of the atmosphere that contains the ozone layer?
💡 The stratosphere, 15-50 km above Earth, contains the ozone layer that absorbs harmful UV radiation from the Sun.
18. What is Newton's First Law of Motion?
💡 Newton's First Law, the law of inertia, states that objects maintain their state of rest or motion unless a net force acts on them.
19. What is the atomic number of carbon?
💡 Carbon has atomic number 6, meaning it has 6 protons in its nucleus. It is the basis of all organic life.
20. What is the unit of electrical resistance?
💡 The ohm (Ω) is the SI unit of electrical resistance, named after German physicist Georg Simon Ohm.