WGU C165 Integrated Physical science Exam

1. Which percentage of Earth’s atmosphere is nitrogen (N₂)?

  5%

  21%

  55%

✔ 78%

2. Which layer of the atmosphere is 12–50 km from Earth’s surface?

  Exosphere

✔ Stratosphere

  Troposphere

  Thermosphere

3. What layer of Earth’s atmosphere contains the ozone layer?

  Thermosphere

  Mesosphere

  Exosphere

✔ Stratosphere

4. Which atmospheric layer is the least dense?

  Troposphere

✔ Exosphere

  Mesosphere

  Thermosphere

5. What commonly results after a low-pressure system develops?

  Rapid humidity changes

  Rain and large hail

  Widespread tornadoes

✔ Cloud formation

6. An air mass rises and cools causing cloud formation. Which pattern is responsible?

  Cold front

  Warm front

✔ Low-pressure system

  High-pressure system

7. Which term describes breakdown of rocks due to compositional changes?

  Deposition

✔ Chemical weathering

  Erosion

  Physical weathering

8. Which scenario demonstrates chemical weathering?

  Temperature cracking

✔ Oxygen reacts with iron

  Tree roots crack rocks

  Sand grinds rocks

9. Which scenario demonstrates deposition?

  Roots exposed

  Mudslide removes soil

  River carves canyon

✔ Debris pile forms

10. Which layer of Earth contains all known living organisms?

  Mantle

✔ Crust

  Inner core

  Outer core

11. Which Earth layer allows continents to move slowly?

  Crust

  Outer core

  Inner core

✔ Mantle

12. Which process moves sediment from one location to another?

  Weathering

  Deposition

✔ Erosion

  Condensation

13. Which example shows physical weathering?

  Rust forming

  Acid rain dissolving rock

✔ Roots cracking rock

  Oxidation

14. Which type of bond forms between magnesium and chlorine?

  Covalent

✔ Ionic

  Hydrogen

  Metallic

15. Which property is characteristic of metals?

  Poor conductors

✔ Lose electrons

  Semiconductors

  Low density

16. Which element is a metalloid?

  Hydrogen

✔ Silicon

  Argon

  Selenium

17. What is the basic building block of matter?

  Element

  Electron

  Neutron

✔ Atom

18. Which subatomic particle is shared in covalent bonding?

  Proton

  Neutron

✔ Electron

  Ion

19. Which form of energy is stored in a compressed spring?

  Kinetic

  Thermal

✔ Elastic potential

  Electrical

20. Which energy conversion occurs in a blender?

✔ Electrical to kinetic

  Chemical to thermal

  Kinetic to electrical

  Potential to kinetic

21. Which wave has the shortest wavelength?

  Infrared

  Visible light

  Ultraviolet

✔ Gamma rays

22. Which wave can travel through a vacuum?

  Mechanical

  Longitudinal

  Transverse

✔ Electromagnetic

23. Which wave is used to detect heat?

  Radio

  Microwave

✔ Infrared

  X-ray

24. Which planet is an inner planet?

  Jupiter

✔ Venus

  Uranus

  Neptune

25. What force formed the solar system?

  Friction

  Heat

✔ Gravity

  Charge

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