GED Science Test #5 2 — Questions and Answers
Question 1: What happens to atoms during a chemical reaction?
- Atoms are rearranged to form new substances (Correct answer)
- Atoms are created from nothing
- Atoms are destroyed
- Atoms change their atomic number
Correct answer: Atoms are rearranged to form new substances
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?
- Igneous (Correct answer)
- Sedimentary
- Metamorphic
- Crystalline
Correct answer: Igneous
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:
- Prokaryote (Correct answer)
- Eukaryote
- Protist
- Organelle
Correct answer: Prokaryote
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?
- Ampere (A) (Correct answer)
- Volt (V)
- Ohm (Ω)
- Watt (W)
Correct answer: Ampere (A)
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:
- Gases in the atmosphere trap heat radiated from Earth's surface (Correct answer)
- The sun emits extra heat toward Earth
- Earth's ozone layer reflects sunlight back to space
- Plants absorb too much CO₂ from the atmosphere
Correct answer: Gases in the atmosphere trap heat radiated from Earth's surface
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.
Question 6: An experiment tests whether fertilizer affects plant height. The scientist grows 10 plants with fertilizer and 10 without. The plants without fertilizer are the:
- Control group (Correct answer)
- Experimental group
- Independent variable
- Dependent variable
Correct answer: Control group
The control group does not receive the treatment being tested (fertilizer). Comparing the experimental group (with fertilizer) to the control group (without) shows the effect of the variable.
GED Science Test #5 2
What happens to atoms during a chemical reaction?