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Test your science knowledge with these moderately challenging questions!
1. What is the most abundant element in the universe?
💡 Hydrogen makes up about 75% of all normal matter in the universe by mass.
2. 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.
3. Which organ produces insulin in the human body?
💡 The pancreas produces insulin, a hormone that regulates blood sugar (glucose) levels in the body.
4. What part of the cell contains genetic information?
💡 The nucleus contains the cell's DNA and acts as the control center, directing cell activities.
5. What does DNA stand for?
💡 DNA (Deoxyribonucleic Acid) is the molecule that carries the genetic instructions for all living organisms.
6. What is the unit of electrical resistance?
💡 The ohm (Ω) is the SI unit of electrical resistance, named after German physicist Georg Simon Ohm.
7. 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.
8. Which planet has the most moons in our solar system?
💡 Saturn has 146 confirmed moons, the most of any planet in our solar system.
9. 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.
10. 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.
11. 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.
12. 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.
13. How many chambers does the human heart have?
💡 The heart has 4 chambers: left atrium, right atrium, left ventricle, and right ventricle.
14. 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.
15. 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.
16. 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.
17. What is the chemical formula for table salt?
💡 Table salt is sodium chloride (NaCl), composed of one sodium atom and one chlorine atom.
18. 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.
19. Which gas makes up most of Earth's atmosphere?
💡 Nitrogen (N₂) makes up approximately 78% of Earth's atmosphere, followed by oxygen at 21%.
20. 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.