PU AHS 2026 Everyday Science Free Quiz 1

1. What is the largest organ of the human body?

A. Liver B. Brain C. Heart D. Skin

2. What is the most abundant gas in the Earth's atmosphere?

A. Oxygen B. Carbon Dioxide C. Nitrogen D. Argon

3. What is the approximate speed of light?

A. 300,000 km/s B. 500,000 km/s C. 150,000 km/s D. 200,000 km/s

4. How many chambers does the human heart have?

A. 2 B. 4 C. 6 D. 3

5. What is the chemical symbol for gold?

A. Ag B. Fe C. Gd D. Au

6. What is the hardest natural substance?

A. Graphite B. Quartz C. Diamond D. Topaz

7. What is the largest planet in our solar system?

A. Saturn B. Jupiter C. Neptune D. Uranus

8. What is the chemical formula for table salt?

A. HCl B. NaOH C. KCl D. NaCl

9. How many bones does the human skeleton have?

A. 200 B. 204 C. 206 D. 208

10. What is the Earth's closest star?

A. Sun B. Proxima Centauri C. Alpha Centauri D. Sirius