The Praxis General Science: Content Knowledge (5435) exam is a test required by many states for credential candidates planning to teach science at a high school level. It is a single, computer-delivered test that includes questions from five content domains.

The content categories are Scientific Methodology, Techniques, and History; Physical Science; Life Science; Earth and Space Science; and Science, Technology, and Society.

Praxis II General Science Content Knowledge (5435) Exam Practice

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25 Questions

1. Which of the following events immediately precedes a volcanic eruption?

batholith forms beneath the Earth's surface.An oceanic plate is subducted by a continental plate.Magma fills vertical and horizontal fractures in the Earth's crust, creating sills and dykes.A dyke reaches the Earth's surface and a plume passes through it.

2. Proteins are made up of which of the following repeating subunits?

Nucleic acidsAmino acidsSugarsTriglycerides

3. Water's specific heat capacity is second only to that of ammonia. This means that:

Water is only denser than ammonia at higher temperatures.Water is always denser than ammonia.It takes more energy to increase the temperature of ammonia than it does to increase the temperature of water.Water vaporizes at a higher temperature than ammonia.

4. Which of the following factors directly contributes to soil erosion?

Use of pesticidesWater pollution caused by excess sedimentationDeforestation and overgrazingAir pollution from cars and factories

5. The density of helium is much lower than that of air. How does the speed of sound traveling through helium gas compare to the speed of sound in air?

It has the same speedIt is slowerIt cannot be determined without knowing their atomic massesIt is faster

6. Which of the following statements is NOT congruent with the theory of plate tectonics?

The continents were once connected in the large supercontinent Pangea.Subduction occurs at divergent boundaries.Seafloor spreading is evidence of tectonic plate movements.The tectonic plates are part of the Earth's lithosphere.

7. Which of the following is NOT supported by Dalton's Atomic Theory of Matter?

Every element consists of tiny particles called atoms which can be split into even smaller pieces.Differences in properties of elements are due to differences in the atoms of the elements.Atoms of a particular element all have the same properties such as size and mass.Chemical processes result from the rearrangement, combination and separation of atoms.

8. Which of the following is a vector quantity?

VelocitySpeedTimeDistance

9. Which of the following statements about energy is false?

Total energy is always conserved in an isolated system.Matter can be transformed into energyEnergy is never created or destroyed.Mechanical energy is always conserved in an isolated system.

10. The majority of weather phenomena occur in which part of the Earth's atmosphere?

TroposphereIonosphereHydrosphereStratosphere

11. Metamorphic rock is produced when which of the following undergoes profound changes as a result of exposure to intense pressure and heat?

A subduction zoneA protolithA batholithA volcano

12. A 100-kg bungee jumper jumps off a bridge, attached to a 20 meter bungee cord. After bouncing around for a minute he finally comes to rest. The stretched cord is now 25 meters long. What is the spring constant of the bungee cord?

3920 newtons per meter49196 newtons per meter

13. Which of the following is a description of the Buckminsterfullerene?

A carbon molecule C60 that forms a hollow sphereA long hollow tube of carbon atomsA one-atom-thick sheet of carbonA particle between 1 and 100 nanometers in size

14. Which of the following is NOT an example of chemical weathering of rocks?

Salt water penetrates fractures in rocks and leaves behind salt crystals that cause fractures.Minerals that comprise rocks take on water, causing them to enlarge and creating fractures within the rocks.Highly acidic rainwater causes dissolution of rocks.Iron molecules in rocks react with atmospheric oxygen, which causes oxidation.

15. Which of the following is a disadvantage of biomass energy?

It is abundantIt is renewableIt is carbon neutralIt requires space

16. Which of the following is a serious disadvantage of fossil fuels?

Relatively safe extractionThey are cheap and plentifulThey contribute to global warmingThe technology to control pollution already exists

17. Which of the following is currently the greatest benefit of genetically modified crops?

Decreased allergens for consumersIncreased shelf-life of foodsIncreased profits for farmersIncreased nutrition for consumers

18. Place the following in the correct order of increasing acidity:H₃PO₄, HF, HCl, H₂O, NH₃

H3PO4<H2O<NH3<HF<HClH2O<NH3<HF<H3PO4<HClNH3<H2O<HF<H3PO4<HClNH3<H2O<HF<HCl<H3PO4

19. Which of the following is NOT true about land reclamation?

Land reclamation may result in soil liquefaction during earthquakes.Land reclamation may destroy habitats and increase biodiversity.Land reclamation creates new lands from ocean beds, riverbeds or lakebeds.Land for agricultural use may be reclaimed by draining submerged wetlands.

20. Two cars driving in opposite directions collide. If you ignore friction and any other outside interactions, which of the following statements is always true?

The total impulse is conserved.The sum of the potential and kinetic energy are conserved.'The total velocity of the cars is conserved."The total momentum is conserved.

21. Which statement best explains why the work done by a gravitational force on an object does not depend on the path the object takes.

When an object falls down the work done by gravity is positive and when an object is thrown up the work done by gravity is negative.A falling object experiences a change in potential energy.Work depends on the path when there is friction. The longer the path the more energy is required to overcome friction.Gravitational fields that arise from the interaction between point masses always produce elliptical paths of motion.

22. Which of the following ideas most aligns with Darwin's work in On the Origin of Species?

Human populations will rapidly increase unless kept in check by limits in food supply.If an organism changes during its life in order to adapt to its environment, those changes are passed on to its offspring.Nature selects the best adapted varieties to survive and reproduce.The geological processes that alter the earth are uniform through time.

23. The lithification process results in the formation of which of the following types of rocks?

ExtrusiveIntrusive igneousMetamorphicSedimentary

24. In which of the following stages of embryo development are the three primary germ layers first present?

ZygoteMorulaGastrulaBlastula e.Coelomate

25. Consider the two vectors below:
Which vector best represents the vector obtained by subtracting A from B (
)?

BACD