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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. Removal of static electricity by conduction






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






3. 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






4. # of protons + # of neutrons






5. Polar molecules






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






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






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






9. Nuclear fission - Nuclear Fusion






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






11. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






12. Mass & weight are not the ____ quality






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






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






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






16. 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.






17. 1. Constructive 2. Destructive






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






19. Average mass of various isotopes of the element.






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






21. Measure of the earth's pull






22. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






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






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






25. Mass of the substance contained per unit of volume






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






27. 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






28. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






29. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






30. 1/10 the base unit






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

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






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






34. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






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






36. 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.






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






38. 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.






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






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






41. 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)






42. Relates pressure & temp. and temp and volume.






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






44. 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






45. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






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






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






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






49. Conduction - Convection - & Radiation






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







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