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






2. 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.






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






4. Carbon atom - atomic number 6 - atomic mass 11






5. 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.






6. 1/1000 the base unit






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. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






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






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






11. 10x the base unit






12. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)






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






14. Elements in the middle of the periodic table - in groups 3-12.






15. Lacking affinity for water. Repels water. Non - polar






16. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






17. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






18. Metal - nonmetals - & metalliods






19. Removal of static electricity by conduction






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






21. Substance that dissociates completely into its ions when added to water and conducts electricity well.






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






23. Electrons in the outermost energy level; they are involved in bond formation






24. 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






25. Excess energy is released into the environment






26. 1/10 the base unit






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






28. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






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






30. Current is measured with a device called...






31. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






32. 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 -






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






34. A functional group consisting of a sulfur atom bonded to a hydrogen atom (






35. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






36. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






37. 1. Constructive 2. Destructive






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






39. Nuclear fission - Nuclear Fusion






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






41. Objects are in thermal contact if they can affect each others temperature






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






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






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






45. Measures the amount of matter in an object






46. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.






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






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






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






50. An isotope has a different number of...