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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. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






2. Polar molecules






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






4. Are small positively charged particles






5. Stored mechanical - Nuclear - Chemical - gravitational






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






7. When measuring the volume of water in a graduated cylinder where does one read the measurement?






8. '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






9. Concave






10. It scatters light in many directions






11. Most directly involved with controlling levels of sugar in blood






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






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






14. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






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






16. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.






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






18. Causes motion






19. (physics and chemistry) the smallest component of an element having the chemical properties of the element






20. You see your reflection






21. Alkali Metals are the most _____________






22. Resistance is measured in...






23. 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






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






25. Mass of the substance contained per unit of volume






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






27. Gram is the base unit of...






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






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






30. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






31. Liter is the base unit of...






32. 1. nuclear reaction 2. radioactive






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






34. Is the measure of energy temperature is a measure of the heat in an object.






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






36. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






37. The region around a magnet where the magnetic force is exerted






38. 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.






39. 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






40. What are the # of protons in the nucleus of an atom called?






41. 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.






42. Relates pressure & temp. and temp and volume.






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






44. Measure of the earth's pull






45. Change from gas to liquid






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






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






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






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






50. The more energy the electrons have