+20 Questions Scientific Theories
20 multiple choice questions on Scientific Theories, designed for middle and high school students. The correct answers are provided at the end.
Multiple Choice Questions: Scientific Theories
1. What is a scientific theory?
A) A wild guess
B) A proven law
C) A well-substantiated explanation of natural phenomena
D) An untested idea
2. How is a scientific theory different from a hypothesis?
A) A theory is less supported
B) A theory is supported by more evidence and testing
C) A theory is a temporary guess
D) A hypothesis is always more accurate
3. Which of the following is an example of a scientific theory?
A) Law of gravity
B) Theory of evolution
C) Boiling point of water
D) Periodic table
4. What is required for a scientific theory to be accepted?
A) A single experiment
B) Public opinion
C) Repeated testing and supporting evidence
D) Government approval
5. Scientific theories can be:
A) Proven and never changed
B) Rejected based on one person's opinion
C) Modified or replaced with new evidence
D) Decided by vote
6. The theory of plate tectonics explains:
A) How planets orbit the sun
B) Movement of Earth’s continents
C) Photosynthesis
D) Formation of elements
7. Which statement about scientific theories is true?
A) They are guesses about how things work
B) They never change
C) They summarize a broad range of observations
D) They are the same as laws
8. Which of these is NOT a characteristic of a scientific theory?
A) Testable
B) Based on evidence
C) Subject to revision
D) Based solely on opinion
9. The Germ Theory of Disease states:
A) All diseases are inherited
B) Microorganisms cause many diseases
C) Germs can be seen with the naked eye
D) All bacteria are harmful
10. The Cell Theory includes all EXCEPT:
A) All living things are made of cells
B) All cells are identical
C) Cells are the basic units of life
D) All cells come from preexisting cells
11. What supports the theory of evolution?
A) Fossil records
B) Genetic evidence
C) Comparative anatomy
D) All of the above
12. Scientific theories are developed through:
A) Personal belief
B) Random trials
C) Repeated observations and experimentation
D) Voting
13. A scientific theory must be:
A) Final and absolute
B) Based on one scientist’s research
C) Able to be tested and potentially falsified
D) Older than 100 years
14. What does the Atomic Theory explain?
A) Weather changes
B) The structure and behavior of atoms
C) Photosynthesis
D) Ocean currents
15. Which theory explains the origin of the universe?
A) Kinetic Molecular Theory
B) Theory of Relativity
C) Big Bang Theory
D) Cell Theory
16. Why do scientific theories sometimes change?
A) Scientists get bored
B) A law is passed to change it
C) New evidence is discovered
D) They are opinions and easily altered
17. How are theories and laws different?
A) Laws explain and theories describe
B) Theories explain and laws describe
C) Laws are guesses
D) There is no difference
18. Which of these is an example of a well-supported scientific theory?
A) Flat Earth Theory
B) Spontaneous Generation
C) Theory of Natural Selection
D) Astrology
19. Which of the following is true about scientific theories?
A) They are guesses with no basis
B) They are based on repeated tests and observations
C) They are always proven false
D) They are never questioned
20. Which theory is used to explain the motion of objects at high speeds?
A) Plate Tectonics
B) Quantum Theory
C) Theory of Relativity
D) Germ Theory
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Answer Key
1. C) A well-substantiated explanation of natural phenomena
2. B) A theory is supported by more evidence and testing
3. B) Theory of evolution
4. C) Repeated testing and supporting evidence
5. C) Modified or replaced with new evidence
6. B) Movement of Earth’s continents
7. C) They summarize a broad range of observations
8. D) Based solely on opinion
9. B) Microorganisms cause many diseases
10. B) All cells are identical
11. D) All of the above
12. C) Repeated observations and experimentation
13. C) Able to be tested and potentially falsified
14. B) The structure and behavior of atoms
15. C) Big Bang Theory
16. C) New evidence is discovered
17. B) Theories explain and laws describe
18. C) Theory of Natural Selection
19. B) They are based on repeated tests and observations
20. C) Theory of Relativity
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