CSU Natural Sciences 3

Question 1

Which scientist is credited with proposing the theory of evolution by natural selection?

Accepted Answer

Charles Darwin

Answer

Charles Darwin published 'On the Origin of Species' in 1859, introducing the theory that species evolve through natural selection.

Question 2

What is the subatomic particle that carries a negative electrical charge?

Accepted Answer

Electron

Answer

Electrons carry a negative charge of -1 and orbit the nucleus of an atom in electron shells or orbitals.

Question 3

Which process involves water molecules moving from a region of higher water concentration to lower water concentration through a semi-permeable membrane?

Accepted Answer

Osmosis

Answer

Osmosis is the passive movement of water molecules across a semi-permeable membrane from a region of higher to lower water potential.

Question 4

Approximately how long is the half-life of Carbon-14, commonly used in radiocarbon dating?

Accepted Answer

5,730 years

Answer

Carbon-14 has a half-life of approximately 5,730 years, making it useful for dating organic materials up to about 50,000 years old.

Question 5

What type of wave requires a physical medium such as air, water, or a solid to travel through?

Accepted Answer

Mechanical wave

Answer

Mechanical waves transfer energy through the vibration of particles in a medium and cannot travel through a vacuum.

(CSU) California State University Practice Test

(CSU) California State University Practice Test

CSU Natural Sciences 3