GED Science Test #5 2

Question 1

What happens to atoms during a chemical reaction?

Accepted Answer

Atoms are rearranged to form new substances

Answer

During a chemical reaction, atoms are rearranged — bonds are broken and new bonds form to create new substances. Matter is neither created nor destroyed (Law of Conservation of Mass).

Question 2

Which type of rock is formed from cooled magma or lava?

Accepted Answer

Igneous

Answer

Igneous rocks form when magma (underground) or lava (surface) cools and solidifies. Examples include granite (intrusive) and basalt (extrusive).

Question 3

A cell without a membrane-bound nucleus is called a:

Accepted Answer

Prokaryote

Answer

Prokaryotes (bacteria and archaea) lack a membrane-bound nucleus. Eukaryotes, which include plants, animals, fungi, and protists, have their DNA enclosed in a nucleus.

Question 4

What is the SI unit for measuring electric current?

Accepted Answer

Ampere (A)

Answer

The ampere (A) measures electric current (flow of charge). Volts measure electric potential, ohms measure resistance, and watts measure power.

Question 5

The greenhouse effect occurs when:

Accepted Answer

Gases in the atmosphere trap heat radiated from Earth's surface

Answer

Greenhouse gases (CO₂, methane, water vapor) in the atmosphere absorb and re-emit infrared radiation from Earth, trapping heat. This natural process is enhanced by human activities.

GED Practice Test

GED Practice Test

GED Science Test #5 2