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






2. 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.






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






4. Organic molecules that are composed of only carbon and hydrogen.






5. 8 electrons






6. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






7. 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.






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






9. 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






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






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






12. Mass of the substance contained per unit of volume






13. A circut with two or more resistors where the electricity has more than one path to travel






14. Decibels






15. Removal of static electricity by conduction






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






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






18. The agent most widely and most consistently at work changing the appearance of the Earth's surface






19. When measuring the volume of water in a graduated cylinder where does one read the measurement?






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






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






22. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






23. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






24. 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






25. Heat energy that is transferred into or out of a system






26. The process of heat transfer via solid contact






27. Mass & weight are not the ____ quality






28. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point






29. Number of protons






30. The amount of energy that it takes to raise one gram of water one degree celsius.






31. 10x the base unit






32. 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






33. Liter is the base unit of...






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






35. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






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






37. 1/1000 the base unit






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






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






40. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






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






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






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






44. Is the path along which electrons flow






45. Average mass of various isotopes of the element.






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






47. Negatively charged particles found outside the nucleus






48. Way of keeping tract of valence electrons






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






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







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