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A science quiz for students and exam preparation — 15 medium-level questions on biology, chemistry, physics and astronomy.
1. What is the region of space around a black hole from which nothing can escape called?
💡 The event horizon marks the boundary beyond which gravity is too strong for anything, even light, to escape.
2. What is the process by which a liquid changes into a gas below its boiling point called?
💡 Evaporation happens at the surface of a liquid and occurs at temperatures below the boiling point.
3. Which part of a neuron receives signals from other neurons?
💡 Dendrites are branch-like extensions of a neuron that receive signals from neighboring nerve cells.
4. What is the term for the total mass of living organisms in a given area called?
💡 Biomass refers to the total mass of living organisms present within a specific area or ecosystem.
5. Which type of chemical bond involves the sharing of electron pairs between atoms?
💡 A covalent bond forms when two atoms share one or more pairs of electrons.
6. What does the ozone layer primarily protect Earth from?
💡 The ozone layer absorbs most of the sun's harmful ultraviolet (UV) radiation, protecting life on Earth.
7. What is the term for the layer of the atmosphere closest to Earth, where weather occurs?
💡 The troposphere is the lowest layer of the atmosphere and is where nearly all weather phenomena occur.
8. Which scientist proposed the three laws of planetary motion?
💡 Johannes Kepler formulated his three laws of planetary motion in the early 17th century.
9. What is the term for the study of the functions of living organisms and their parts?
💡 Physiology studies how living organisms and their organs and systems function.
10. Which vitamin is essential for proper blood clotting?
💡 Vitamin K plays a key role in producing proteins needed for normal blood clotting.
11. What is the name of the chemical process by which green plants convert light energy into chemical energy?
💡 Photosynthesis allows plants to convert sunlight into chemical energy stored in glucose.
12. Which planet has the highest surface temperature in the solar system?
💡 Despite being farther from the sun than Mercury, Venus is hotter due to its thick, heat-trapping atmosphere.
13. Which element is the main component of natural diamonds?
💡 Diamonds are formed from pure carbon atoms arranged in a strong crystal lattice structure.
14. Which blood vessels carry oxygen-rich blood away from the heart?
💡 Arteries carry oxygenated blood away from the heart to the rest of the body.
15. What is the SI unit used for measuring frequency?
💡 Frequency is measured in hertz (Hz), representing the number of cycles per second.