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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. Shiny - softer & less dense. Mostly chemically active






2. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






3. 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.






4. 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






5. 1. nuclear reaction 2. radioactive






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






7. Is the study of the relationship between motion & the forces affecting motion.






8. 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






9. Gram is the base unit of...






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






11. 2 or more substances combine to form a compound EX. A+B -> AB






12. The process of heat transfer via solid contact






13. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






14. 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






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






16. Change in the apparent frequency of a wave as observer and source move toward or away from each other






17. Is the measure of energy temperature is a measure of the heat in an object.






18. Potential & Kinetic






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






20. The total entropy of a system plus that of its surroundings always increase.






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






22. 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?






23. 100x the base unit






24. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible






25. Excess energy is released into the environment






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






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






28. The speed of light changes in different materials this is due to__






29. Used in electrical devices that have to function at temperatures too high for metals.






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






31. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






32. It scatters light in many directions






33. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.






34. The volume of a gas is directly proportional to the temperature of a gas






35. Nuclear fission - Nuclear Fusion






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






37. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






38. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






39. Are small positively charged particles






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






41. Pressure is measures in a unit called






42. The center of the atom.






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






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






45. 1000x the base unit






46. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






47. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






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






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






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