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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. Is an atom that has all of its electrons in the lowest possible energy levels






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






3. 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.






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






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






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






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






8. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






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






10. 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.






11. They are neither precise nor accurate.






12. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






13. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






14. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions






15. Which of the following parts of the Sun is easily visible only during a total solar eclipse






16. Liter is the base unit of...






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






18. Series circut - Parallel circut






19. Potential & Kinetic






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






21. 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.






22. The buoyant force on an object is equal to the weight of the fluid displaced by the object






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






24. 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)






25. 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.






26. 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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27. Alkali metals






28. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






29. The more energy the electrons have






30. 8 electrons






31. Experiments may not be done on...






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






33. Gram is the base unit of...






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






35. The property of sound that varies with variation in the frequency of vibration.






36. Negatively charged particles found outside the nucleus






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






38. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.






39. 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.






40. Heat transferred by fluid current






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






42. 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.






43. 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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44. The number of electrons per second that flow past a point in a circut.






45. Concave






46. Removal of static electricity by conduction






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






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






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






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