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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 relationship between voltage - current - and resistance - V=IR






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






3. Elements in the middle of the periodic table - in groups 3-12.






4. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






5. 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.






6. 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?






7. 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






8. Negatively charged particles found outside the nucleus






9. Experiments may not be done on...






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






11. 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.






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






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






14. Measure of the earth's pull






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






16. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






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






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






19. Ratio of the density of a substance to the density of water






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






21. Removal of static electricity by conduction






22. An electric circut with a single path






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






24. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






25. 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.






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






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






28. Series circut - Parallel circut






29. Mass of the substance contained per unit of volume






30. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






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






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






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






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






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






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






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






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






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






41. Is the change from liquid to gas.






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






43. (physics) the capacity of a physical system to do work - or supply heat.






44. Excess energy is released into the environment






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






46. Measures the amount of matter in an object






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






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






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






50. Heat transferred by direct contact