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






2. Non - metals - group 18 - the most non - reactive elements






3. It scatters light in many directions






4. 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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5. 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






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






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






8. Higher because it has higher apparent frequency.






9. Stored mechanical - Nuclear - Chemical - gravitational






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






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






12. 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.






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






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






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






16. Alkali Metals are the most _____________






17. Heat transferred by direct contact






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






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






20. The relationship between voltage - current - and resistance - V=IR






21. An isotope has a different number of...






22. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






23. A carbon atom linked by a double bond to an oxygen atom. - c=o.






24. Is the study of the relationship between motion & the forces affecting motion.






25. 10x the base unit






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






27. Excess energy is released into the environment






28. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






29. Finding that a solution conducts an electric current shows conclusively that the solution...






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






31. 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.






32. A buret is used to deliver solution in precisely - measured - variable volumes. deliver one reactant until the precise end point of the reaction is reached.






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






34. Measures the amount of matter in an object






35. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






36. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






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






38. Is the change from liquid to gas.






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






40. Measure of the earth's pull






41. Are small positively charged particles






42. Is the work done divided by the amount of the time it took to do it. P= w/t






43. Potential & Kinetic






44. 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.






45. Meter is the base unit of...






46. (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.






47. Experiments may not be done on...






48. Atoms with an equal # of protons and electrons.






49. 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.






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