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






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






3. Alkali metals






4. It scatters light in many directions






5. 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






6. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






7. A boulder is sitting at the edge of the cliff it has which type of energy?






8. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






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






10. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






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






12. The relationship between voltage - current - and resistance - V=IR






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






14. Is the path along which electrons flow






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






16. 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)






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






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






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






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






21. 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.






22. Harder - denser - have higher melting points & are chemically active.






23. 1000x the base unit






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






25. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






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






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






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






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






30. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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






32. 1/1000 the base unit






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






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

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35. Change in the apparent frequency of a wave as observer and source move toward or away from each other






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






37. 100x the base unit






38. 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






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






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






41. Polar molecules






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






43. Metal - nonmetals - & metalliods






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






45. Negatively charged particles found outside the nucleus






46. Measures the amount of matter in an object






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






48. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






49. Have properties in between metals and non - metals found in groups 13-16






50. (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.