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






2. Negatively charged particles found outside the nucleus






3. Experiments may not be done on...






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






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






6. Conduction - Convection - & Radiation






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






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






9. An electric circut with a single path






10. The object is further than one focal length from the lens






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






12. You see your reflection






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






14. Temporary magnets that lose their magnetism when electric current is removed






15. Removal of static electricity by conduction






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






17. 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 -






18. Record vibrations in earth & allow us to measure earthquake activity.






19. Reflects the light in one direction






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






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






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






23. A heat that required to change (water from liquid to solid) from one state to another.






24. What are the # of protons in the nucleus of an atom called?






25. 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.






26. 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






27. Are small positively charged particles






28. Alkaline earth metals






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






30. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






31. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






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






33. The branch of physics that deals with static electricity - study of stationary electric charges.






34. Measures the amount of matter in an object






35. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






36. 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.






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






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






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






40. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






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

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42. The more energy the electrons have






43. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






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






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






46. Where are protons an neutrons located?






47. Mass & weight are not the ____ quality






48. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






49. 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






50. Is the work done divided by the amount of the time it took to do it. P= w/t