forensics

[brettfavre432]

1. when forensic scientists are choosing the appropriate analytical technique all of the following are true except a. which properties are to be measured b. whether the evidence is organic or inorganic c. the socio-economic status of the crime victim d. the need for qualitive or quantitive determination 2. gas chromatography is a preferable test of organic material for all of the following reasons except its ability to a. identify matter with total certainty b. yield high sensitive quantitative results c. use retention time characteristics to help identify material d. take a short amount of time to break down highly complex mixtures 3. high performance liquid chromatographys major advantage over basic gas chromatography is that it a. uses a simple capillary action to separate mixtures b. results in a permanent record of mixture seperation c. allows examination of heat-sensitive explosives and drugs d. involves the vaporization of samples prior to their analysis 4. the technique that has the capability of analyzing small amounts of multiple organic substances on one plate at low cost, but requires visualizing the organic material by placing the plates under ultraviolet light or spraying them with a chemical reagent is a. gas chromatography b. infrared spectrphotometry c. thin layer chromatography d.high performance liquid chromatography 5. which of the following depends on variations in the charge and size of proteins to migrate across a charged get coated plate to identify blood enzymes a. chromatography b. electrophoresis c. sublimation d. pyrolysis 6. which of the following instrument depends upon the relationship known as Beer's Law a. gas chromatograph b. spectrophotometer c. pyrogram d. laser 7. the basic components of a simple spectrophotometer include all of the following except a. detector b. recorder c. stationary phase d.frequency selector 8. instead of using a monochromator most lab infrared spectrophotometers currently rely on which of the following to measure the wavelengths of light a material will absorb in the infrared spectrum a.Beer's Law b. Henry's Law c. Plancks constant d.fouriers transform analysis 9. The unique feature of mass spectrometry is that under carefully controlled conditions a. fingerprints can become visible to the naked eye b. light becomes a stream of discrete energy particles c. no two substances produce the same fragmentation pattern d. multiple components of a mixture can be displayed on a chromatogram 10. the ultimate identification of organic materials in terms of speed accuracy and sensitivity occurs with the integration of all of the following except the a. monochromator b. computer system c. mass sectrometer d. gas chromatograph 11. antimony and silver concentrations in the kennedy assassination bullets test represent which of the following a. organic analysis b. invisible markers c. stationary phases d. evidence identification 12. exciting the atoms of a samples elements to the point they emit light which then can be separated into its component frequencies and recorded, BEST descrbes which of the following a. electrophoresis b. x-ray diffraction c. emmision spectrograph d. neutron activation analysis 13. a drawback to emission spectrometry as applied to the analysis of mutilated bullets is that: a. trace elements cannot be easily detected b. elemental profiles may not constitute a definitive match c.courts have not accepted the validity of this scientific procedure d. the elemental spectrum is an unreliable method of identification 14. Advantages of flameless atomic absorption spectrophotometry include all the following except a. low cost b. simplicity c. increased sensitivity d. multiple element identification 15. which of the following determines the identity of an isotope a. atoms b.protons c. electrons d. neutrons 16. which of the following will generate radiation a. photons interaction with an electron b.drop of electrons into lower energy orbits c. spontaneous disintegration

[Fibonacci]

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