Test your basic knowledge |

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






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






3. 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?






4. 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






5. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






6. Current is measured with a device called...






7. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






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






9. 1/10 the base unit






10. The object is further than one focal length from the lens






11. '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






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






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






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






15. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






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






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






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






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






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






21. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






22. 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.






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






24. 1. Constructive 2. Destructive






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






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






27. Electrons that can accept energy from outside sources and move farther away from the nucleus






28. Decibels






29. Way of keeping tract of valence electrons






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






31. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






32. 10x the base unit






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






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






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






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






37. 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






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






39. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






40. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






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






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






43. They are neither precise nor accurate.






44. The amount of energy required for the liquid at its boiling point to become a gas






45. The more energy the electrons have






46. Carbon atom - atomic number 6 - atomic mass 11






47. Concave






48. Mass of the substance contained per unit of volume






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






50. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.