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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. Measure of the earth's pull






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






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






4. The ability of the material to oppose the flow of electrons through it all






5. Are small positively charged particles






6. 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.






7. The mechanical energy that a body has by virtue of its position Ex. Stored energy -






8. Meter is the base unit of...






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






10. 1/1000 the base unit






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






12. Mass of the substance contained per unit of volume






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






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






15. 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






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






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






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






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






20. 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)






21. Substance that dissociates completely into its ions when added to water and conducts electricity well.






22. Which of the following parts of the Sun is easily visible only during a total solar eclipse






23. 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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24. Removal of static electricity by conduction






25. Electrical - Light (radiant) - Heat (thermal) - Movement






26. Pressure is measures in a unit called






27. Average mass of various isotopes of the element.






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






29. The region around a magnet where the magnetic force is exerted






30. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.






31. 1. nuclear reaction 2. radioactive






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






33. Higher because it has higher apparent frequency.






34. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






35. Lacking affinity for water. Repels water. Non - polar






36. Alkali Metals are the most _____________






37. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






38. Where are protons an neutrons located?






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






40. 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.






41. Potential & Kinetic






42. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






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






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






45. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






46. 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.






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






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






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






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.