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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. Excess energy is released into the environment






2. 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






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






4. Measures the amount of matter in an object






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






6. Temporary magnets that lose their magnetism when electric current is removed






7. 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






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






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






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






11. 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?






12. Relates pressure & temp. and temp and volume.






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






14. Polar molecules






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






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






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






18. Stored mechanical - Nuclear - Chemical - gravitational






19. (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.






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






21. Mass of the substance contained per unit of volume






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






23. They are neither precise nor accurate.






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






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






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






27. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






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






29. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






30. Way of keeping tract of valence electrons






31. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






32. Experiments may not be done on...






33. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






34. 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.






35. The center of the atom.






36. Heat transferred by fluid current






37. The interference that occurs when two waves combine to make a wave with a larger amplitude






38. 1/10 the base unit






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






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






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






43. Change from gas to liquid






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






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






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






47. 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






48. Is a simple device used to indicate the existence of a positive or negative charge.






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






50. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).