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Play this advanced science quiz online for free — 20 hard questions and answers on physics, biology, chemistry and space.
1. What is the term for the theoretical boundary of the observable universe?
💡 The cosmological horizon marks the limit of the observable universe, beyond which light hasn't had time to reach us.
2. Which scientist proposed the theory of continental drift?
💡 Alfred Wegener proposed in 1912 that continents were once joined and have since drifted apart.
3. What is the name of the theory describing how species evolve through survival and reproduction of the fittest individuals?
💡 The Theory of Evolution, proposed by Charles Darwin, explains how species change over generations through natural selection.
4. What is the name of the process by which an egg cell is fertilized and begins to divide?
💡 Fertilization occurs when a sperm cell merges with an egg cell, triggering cell division and development.
5. What is the term for a compound made of only carbon and hydrogen atoms?
💡 Hydrocarbons are organic compounds consisting entirely of carbon and hydrogen atoms, forming the basis of fuels like gasoline.
6. Which planet's atmosphere is composed primarily of hydrogen and helium, similar to the sun's composition?
💡 Jupiter's atmosphere is made mostly of hydrogen and helium, mirroring the composition of the sun.
7. What is the term for an organism that can survive in environments with little to no oxygen?
💡 Anaerobes are organisms that can survive and even thrive in environments lacking oxygen.
8. Which chemist is credited with formulating the atomic theory of matter in the early 19th century?
💡 John Dalton proposed that matter is composed of indivisible atoms, laying the foundation for modern atomic theory.
9. What is the name of the genetic blood disorder that affects hemoglobin and is common in some African and Mediterranean populations?
💡 Sickle cell anemia is a genetic disorder that causes red blood cells to become misshapen, common in populations from malaria-prone regions.
10. What is the term for the process by which organisms with favorable traits are more likely to survive and reproduce?
💡 Natural selection is the process where advantageous traits become more common in a population over generations.
11. What is the process by which plants release excess water vapor through pores called stomata?
💡 Transpiration is the loss of water vapor from plant leaves, mainly through small openings called stomata.
12. Which scientist is credited with the discovery of X-rays?
💡 Wilhelm Rontgen discovered X-rays in 1895, earning him the first Nobel Prize in Physics.
13. What is the name of the genetic material found in mitochondria, inherited only from the mother?
💡 Mitochondrial DNA is passed down exclusively from the mother, making it useful for tracing maternal lineage.
14. What is the SI unit for measuring the amount of a substance?
💡 The mole is the SI unit used to express amounts of a chemical substance, based on the number of particles it contains.
15. Which type of galaxy is the Milky Way classified as?
💡 The Milky Way is a barred spiral galaxy, with arms of stars, gas, and dust winding out from its center.
16. Which scientist developed the first successful vaccine, against smallpox?
💡 Edward Jenner developed the first successful smallpox vaccine in 1796, pioneering the field of immunology.
17. Which particle in an atom primarily determines its chemical properties and reactivity?
💡 The arrangement of electrons, particularly in the outer shell, determines how an atom interacts chemically with others.
18. Which force holds the nucleus of an atom together despite the repulsion between protons?
💡 The strong nuclear force overcomes the electromagnetic repulsion between protons, binding the atomic nucleus together.
19. What is the term for the point during Earth's orbit when it is closest to the sun?
💡 Perihelion is the point in Earth's elliptical orbit when it is nearest to the sun, occurring in early January.
20. Which type of wave requires a physical medium, such as air or water, to travel through?
💡 Mechanical waves, like sound waves, need a medium such as air, water, or solids to propagate.