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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. Animals in which of the following groups may have a backbone and a spinal cord?






2. Stored mechanical - Nuclear - Chemical - gravitational






3. Finding that a solution conducts an electric current shows conclusively that the solution...






4. Alkali Metals are the most _____________






5. 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 -






6. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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7. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen

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8. 2 or more substances combine to form a compound EX. A+B -> AB






9. Polar molecules






10. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






11. 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.






12. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






13. Measure of the earth's pull






14. A buret is used to deliver solution in precisely - measured - variable volumes. deliver one reactant until the precise end point of the reaction is reached.






15. The amount of energy required for the liquid at its boiling point to become a gas






16. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






17. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






18. 1000x the base unit






19. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






20. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






21. Heat transferred by direct contact






22. Heat transferred by fluid current






23. Liter is the base unit of...






24. Non - metals - group 18 - the most non - reactive elements






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






26. You see your reflection






27. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






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






29. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






30. A carbon atom linked by a double bond to an oxygen atom. - c=o.






31. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






32. The interference that occurs when two waves combine to make a wave with a smaller amplitude






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






34. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






35. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






36. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






37. (physics) the capacity of a physical system to do work - or supply heat.






38. The transfer of heat by electromagnetic waves is called?






39. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






40. They form only over warm oceans






41. The ability of the material to oppose the flow of electrons through it all






42. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






43. Electrons that can accept energy from outside sources and move farther away from the nucleus






44. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






45. Mass of the substance contained per unit of volume






46. All processes cease when temperature approaches 0.






47. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






48. Do not have molecules with one of the two molecular arrangements required to give an odor






49. The device (bell or Build) is an example of a load. A load is a device that uses energy.






50. Most directly involved with controlling levels of sugar in blood






Can you answer 50 questions in 15 minutes?



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