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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 object is further than one focal length from the lens






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






3. Alkali Metals are the most _____________






4. 100x the base unit






5. Change from gas to liquid






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






7. Series circut - Parallel circut






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






9. 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.






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






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






12. Measure of the earth's pull






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






14. It scatters light in many directions






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






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






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






18. 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






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






20. # of protons + # of neutrons






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






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






23. 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)






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






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






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






27. The center of the atom.






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






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






30. Reflects the light in one direction






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






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






33. They form only over warm oceans






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


35. Measures the amount of matter in an object






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






37. Conduction - Convection - & Radiation






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






39. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






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






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






42. (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.






43. 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.






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






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






46. All processes cease when temperature approaches 0.






47. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






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






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






50. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts