NCAE-science-Reviewer.docx

**1. Which of the following is the primary source of energy for life on Earth?** - **Answer: B) The Sun** **2. What is the chemical symbol for water?** - **Answer: C) H2O** **3. Which organ in the human body is responsible for pumping blood?** - **Answer: D) Heart** **4. What type of sim...

**1. Which of the following is the primary source of energy for life on Earth?** - **Answer: B) The Sun** **2. What is the chemical symbol for water?** - **Answer: C) H2O** **3. Which organ in the human body is responsible for pumping blood?** - **Answer: D) Heart** **4. What type of simple machine is a seesaw?** - **Answer: A) Lever** **5. Which gas is most abundant in Earth\'s atmosphere?** - **Answer: C) Nitrogen** **6. What is the smallest unit of life?** - **Answer: C) Cell** **7. Which planet is known as the \"Red Planet\"?** - **Answer: B) Mars** **8. What is the process by which plants make their own food using sunlight?** - **Answer: C) Photosynthesis** **9. Which element is necessary for the formation of bones and teeth?** - **Answer: B) Calcium** **10. Which of the following is a conductor of electricity?** - **Answer: D) Copper** **11. What is the primary function of red blood cells?** - **Answer: B) Carry oxygen** **12. What is the pH level of a neutral substance like pure water?** - **Answer: B) 7** **13. Which organelle is known as the powerhouse of the cell?** - **Answer: C) Mitochondrion** **14. Which of the following diseases is caused by a virus?** - **Answer: C) Influenza** **15. What do we call a substance that speeds up a chemical reaction without being consumed?** - **Answer: B) Catalyst** **16. What type of bond is formed when atoms share electrons?** - **Answer: B) Covalent bond** **17. Which layer of the Earth is composed mostly of solid iron and nickel?** - **Answer: D) Inner Core** **18. What is the most common element in the universe?** - **Answer: D) Hydrogen** **19. Which of the following organisms is a prokaryote?** - **Answer: B) Bacterium** **20. What do we call the change from liquid to gas?** - **Answer: C) Evaporation** **21. Which law explains that for every action, there is an equal and opposite reaction?** - **Answer: C) Newton\'s Third Law** **22. What is the main gas found in the bubbles of carbonated drinks?** - **Answer: C) Carbon Dioxide** **23. What kind of energy transformation occurs in a battery-powered flashlight?** - **Answer: A) Chemical to Electrical to Light** **24. What type of rock is formed from cooled lava or magma?** - **Answer: C) Igneous** **25. Which of the following materials is magnetic?** - **Answer: D) Iron** **26. What is the atomic number of Carbon?** - **Answer: A) 6** **27. Which part of the plant is primarily responsible for photosynthesis?** - **Answer: C) Leaf** **28. Which planet in our solar system has the most moons?** - **Answer: B) Jupiter** **29. What do we call the force that pulls objects toward the center of the Earth?** - **Answer: B) Gravity** **30. Which scientist developed the theory of general relativity?** - **Answer: B) Albert Einstein**