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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. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






2. Experiments may not be done on...






3. Meter is the base unit of...






4. (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.






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






6. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






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






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






9. 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






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






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






12. Way of keeping tract of valence electrons






13. Nuclear fission - Nuclear Fusion






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






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






16. All processes cease when temperature approaches 0.






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






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






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






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






21. Number of protons






22. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






23. Alkali Metals are the most _____________






24. 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.






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






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






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






28. 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






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






30. 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 -






31. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






32. They form only over warm oceans






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






34. 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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35. 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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36. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






37. 1. Constructive 2. Destructive






38. 1. nuclear reaction 2. radioactive






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






40. Is done on an object when an applied force moves across a distance.






41. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






42. The sum of the protons and neutrons






43. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






44. Removal of static electricity by conduction






45. Causes motion






46. 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.






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






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






49. Heat transferred by direct contact






50. Resistance is measured in...