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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. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.






2. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






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






4. 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)






5. The more energy the electrons have






6. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






7. An electric circut with a single path






8. All processes cease when temperature approaches 0.






9. Relates pressure & temp. and temp and volume.






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






11. Higher because it has higher apparent frequency.






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






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






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






15. Heat transferred by fluid current






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






17. 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 -






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






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






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






21. 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






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






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






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






25. The device (bell or Build) is an example of a load. A load is a device that uses energy.






26. 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.






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






28. Small uncharged particles in the nucleus they are neutral






29. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






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






31. 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.






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






33. Change from gas to liquid






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






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






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






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






38. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






39. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen

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40. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts






41. Concave






42. 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






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






44. 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






45. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






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






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






48. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






49. Polar molecules






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