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Praxis General Science

Subjects : praxis, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Concave






2. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






3. The interference that occurs when two waves combine to make a wave with a larger amplitude






4. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






5. Atoms of the same element that have different numbers of neutrons






6. The process of heat transfer via solid contact






7. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






8. Alkaline earth metals






9. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






10. Potential & Kinetic






11. # of protons + # of neutrons






12. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






13. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.






14. Causes motion






15. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






16. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






17. The agent most widely and most consistently at work changing the appearance of the Earth's surface






18. Relates pressure & temp. and temp and volume.






19. Is a simple device used to indicate the existence of a positive or negative charge.






20. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






21. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






22. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






23. The acceleration of an object depends on the mass of the object and the amount of force applied.






24. Harder - denser - have higher melting points & are chemically active.






25. Inclined plane - lever - wheel & axle - pulley.






26. (physics and chemistry) the smallest component of an element having the chemical properties of the element






27. Ratio of the density of a substance to the density of water






28. The molecular weight of a substance expressed in grams - measures the amount of a substance






29. A principle that states that for every action there is an equal reaction in the opposite direction

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30. Mass of the substance contained per unit of volume






31. The amount of heat it takes to change a solid to a liquid






32. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.






33. The region around a magnet where the magnetic force is exerted






34. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






35. Solids - gasses - and 1 liquid (Bromine)






36. When measuring the volume of water in a graduated cylinder where does one read the measurement?






37. 100x the base unit






38. The more energy the electrons have






39. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






40. Change from gas to liquid






41. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






42. 1000x the base unit






43. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






44. A wave in which the particles move parallel to the path of the wave






45. Pressure is measures in a unit called






46. They are neither precise nor accurate.






47. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






48. 10x the base unit






49. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






50. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.