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






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






3. Alkaline earth metals






4. Polar molecules






5. The amount of energy that it takes to raise one gram of water one degree celsius.






6. '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






7. Specific gravity is the ratio based on...






8. Experiments may not be done on...






9. It scatters light in many directions






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






11. Series circut - Parallel circut






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






13. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






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






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






16. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






17. 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






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






19. Objects are in thermal contact if they can affect each others temperature






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






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






22. 1/1000 the base unit






23. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






24. Stored mechanical - Nuclear - Chemical - gravitational






25. 10x the base unit






26. 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.






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






28. Relates pressure & temp. and temp and volume.






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






30. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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






32. Used in electrical devices that have to function at temperatures too high for metals.






33. 1. Constructive 2. Destructive






34. (physics and chemistry) the smallest component of an element having the chemical properties of the element






35. 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.






36. Alkali Metals are the most _____________






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






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






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






40. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






41. Excess energy is released into the environment






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






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






44. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






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






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






47. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






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






49. The center of the atom.






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