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. A 1kg block each of iron, lead and nickel are heated from 20 °C to 30 °C.  Which of the following statements about the blocks is true?

The lead will heat faster than the iron and the nickel.The iron required more time to reach 30°C.The iron required more heat to reach 30 °C than the nickel or lead.All three blocks required a different amount of heat to reach 30 °C.

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

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

3. A motorcycle weighs twice as much as a bicycle and is moving twice as fast. Which of the following statements is true?

The motorcycle has eight times as much kinetic energy as the bicycle.The motorcycle has four times as much kinetic energy as the bicycle.The bicycle has four times as much kinetic energy as the motorcycle.The bicycle and the motorcycle have the same kinetic energy.

4. What is the speed of a wave with a frequency of 12 Hz and a wavelength of 3 meters?

0.25 meters per second412 meters per second36

5. Which of the following is a vector quantity?

SpeedDistanceVelocityTime

6. Which section of the digestive system is responsible for water reabsorption?

duodenumThe gallbladdersmall intestinelarge intestine

7. When an earthquake occurs, the 'shaking' that is observed results directly from:

Seismic waves.Continental drift.CompressionStatic deformation.

8. An athlete's foot is in contact with a kicked football for 100 milliseconds and exerts a force on the football over a distance of 20 centimeters. The force starts at 0 N and increases linearly to 2000 N for 50 milliseconds through a distance of 10 centimeters and then decreases linearly for 50 milliseconds through a distance of 10 centimeters. What is the average power of the athlete's foot while it is in contact with the ball?

4 kilowatts2 kilowatts2000 kilowatts4000 kilowatts

9. Which of the following types of igneous rock solidifies deepest beneath the Earth's surface?

VolcanicDetritalPlutonicHypabyssal

10. Which of the following historical figures is NOT correctly matched with his contribution to modern science?

Louis Pasteur and the germ concept of diseaseNicolaus Copernicus and the heliocentric view of the solar systemThomas Edison and the theory of relativityJohannes Kepler and the laws of planetary motion

11. An automobile increased its speed uniformly from 20 m/s to 30 m/s at rate 5 m/s². During this time it traveled 50 meters. How long did it take the automobile to make this change?

Can't be determined.5 seconds102

12. Which of the following demonstrations best illustrates Newton's first law?

Running a current through two parallel wires.Trying without success to move a heavy bureau or filing cabinet on the floor.Dragging a box on a table at a constant speed by exerting a force just enough to overcome the force of friction.Giving a billiard ball at rest on a smooth level table a small push and letting it roll on the table.

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

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

14. Which of the following plant structures allows for gas exchange?

XylemStomataQuestionsPhloemCuticle

15. A 10-kg plastic block is at rest on a flat wooden surface. The coefficient of static friction between wood and plastic is 0.6 and the coefficient of kinetic friction is 0.5. How much horizontal force is needed to start the plastic box moving?

49 N98 N59 N5 N

16. A bowling ball with a mass of 4 kilograms moving at a speed of 10 meters per second hits a stationary 1 kg bowling ball in a head-on elastic collision. What is the speed of the stationary ball after the collision?

Less than10 m/s, but not 0 m/s.10 m/s.0 m/sMore than 10 m/s

17. Which of the atomic models listed below is the most recent?

Dalton's atomic modelThomson'sBohr'sRutherford's atomic model

18. In resonance, small vibrations can produce a larger standing wave that becomes stronger than the original vibrations, assuming the vibrations are at the right frequency to generate resonance. If a pendulum is vibrated at a resonance frequency, what would you expect to happen?

The period of the pendulum will increase.The time between swings will decrease.The length of the pendulum will decrease.The pendulum will swing higher.

19. When a solid is heated and transforms directly to the gaseous phases, this process is called:

diffusionsublimationfusioncondensation

20. According to the laboratory safety rules, what should students be instructed to do first in case of a laboratory fire?

Notify the instructorOpen the windowsLocate the nearest exitUse the fire extinguisher

21. The Earth's magnetic field protects it from:

Solar wind.Impacts from space debris.Radio waves from black holes.Excess heat from the Sun.

22. Which of the following parts of an angiosperm give rise to the fruit?

FilamentPedicelOvarySepal

23. The process that causes lithospheric plates to move over the surface of the mantle is called:

Conduction.Subduction.Convection.Tension.

24. Adding a catalyst to a reaction will do which of the following to that reaction:

Increase the temperature of the reactionIncrease the purity of the reaction productsDecrease the energy of activation for the reactionShift the reaction equilibrium towards the products

25. 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?

4939196 newtons per meter20 newtons per meter