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CHAPTER 01 1. Any meaningfu l quantitative laboratory result consists of: (A) One component (B) Two components (C) Three components (D) Four components Ans B Diff Easy Page 74 2. The System International of the Units (SI), adopted internationally in ………., is preferred in scientific literature and clinical laboratories and is the only system employed in many countries. (A) 1959 (B) 1960 (C) 1961 (D) 1962 Ans D Diff Medium Page 74 3. ……... is the only basic unit that contains a prefix as part of its name . (A) Kilogram (B) Degree Celsius (C) Katal (D) Kilometer Ans. A Diff Easy Page 78 4. The conversion of 5.3 mL to dL =…………..? (A) 0.053 dL (B) 0.0053 dL (C) 0.53 dL (D) 0.530 dL Ans A Diff Hard Page 78 5. A …………… is a highly purified chemical that can be measured directly to produce a substance of exact known concentration and purity . (A) Primary Standard (B) Organic Reagent (C) Reference Material (D) None of above Ans A Diff Medium Page 81 6. Reverse osmosis is a process that uses pressure to forc e water through a semipermeable membrane, producing water that reflects a filtered product of the original water . (A) Osmosis (B) Reverse Oxidation (C) Oxidation (D) Reverse Osmosis Ans D Diff Medium Page 83 7. Any chemical or biologic solution is described by its basic property of (A) Concentration (B) Solution (C) Ionic Strength (D) All of the above Ans D Diff Medium Page 84 8. ……………. is expressed as the number of moles per 1 L of solution. (A) Molarity (B) Molalit y (C) Percent Solution (D) None of the above Ans D Diff Hard Page 84 9. ……….. is the temperature at which the vapor pressure of the solvent reaches atmospheric pressure (usually one atmosphere) ? (A) Boiling Point (B) Freezing Point (C) Melting Point (D) Condensing Point Ans A Diff Easy Page 86 10. Buffers are ………. and their related salts that, as a result of their dissociation characteristics, minimize changes in the hydrogen ion concentration . (A) Weak Acids (B) Weak Bases (C) Weak Acids or Bases (D) Strong Acids or Basis Ans C Diff Hard Page 87 11. . The predominant practice for temperature measurement uses the …….. scale . (A) Celsius (°C) (B) Fahrenheit (°F) (C) Kelvin (°K) (D) All of the above Ans A Diff Medium Page 89 12. How many grams are needed to make 1 L of a 2 M solution of HCl? (A) 73 g (B) 70 g (C) 37 g (D) 7 g Ans A Diff Hard Page 116 13. A solution of NaOH is contained within a Class A 1 -L volumetric flask filled to the ca libration mark. The content label reads 24 g of NaOH. Determine the molarity. (A) 0.6 mol/L (B) 0.006 mol/L (C) 0.06 mol/L (D) 60 mol/L Ans A Diff Hard Page 116 14. The nor mality of a 500 mL solution containing 7 g of H2SO4 will be: (A) 0.285 N (B) 0.279 N (C) 0.582 N (D) 0.972 N Ans A Diff Hard Page 118 15. The actual weight of a supply of concentrated HCl, whose label reads specific gravity 1.19 with an assay value of 37% will be (A) 0.44 gm/mL (B) 0.40 gm/mL (C) 0.45 g m/mL (D) 0.43gm/mL Ans A Diff Hard Page 120 16. Amniotic fluid is used to assess (A) Lung maturity (B) Congenital Diseases (C) Genetic defects (D) All of the above Ans D Diff Medium Page 137 17. The ∆A per minute for an enzyme reaction is 0.250. Th e product measured has a molar absorptivity of 12.2 × 103 at 425 nm at 30°C. The incubation and reaction temperature are also kept at 30°C. The assay calls for 1 mL of reag ent and 0.050 mL of sample. The enzyme activity result will be equal to (A) 430 U (B) 440 U (C) 450 U (D) 460 U Ans A Diff Hard Page 134 18. The biuret protein assay is very stable and follows Beer's law. Rather than make up a completely new standard graph, one standard (6 g/dL) was assayed. The absorbance of the standard was 0.400, and the absorbance of the unknown was 0.350. Determine the value of the unknown in g/dL. (A) 2.25 g/dL (B) 3.25 g/dL (C) 4.25 g/dL (D) 5.25 g/dL Ans D Diff Hard page 131 19. A procedure requires 0.9 g of CuSO4. All that is available is CuSO4 ·5H2O. What we ight of CuSO4 ·5H2O is needed? (A) 1.41 g (B) 1.31 g (C) 1.21 g (D) 1. 11 g Ans A Diff Hard Page 129 20. A serial dilution may be defined as multiple progressive dilutions ranging from (A) More concentrated solutions to less concentrated solutions (B) Less concentrated solutions to more concentrated solutions (C) Both of above (D) None of above Ans A Diff Medium Page 126 21. A 1:2 dilution of serum with saline had a creatinine result of 8.6 mg/dL. Calculate the actual serum creatinine concentrati on. (A) 17.2 mg/dL (B) 17.1 mg/dL (C) 17.0 mg/dL (D) None of the above Ans A Diff Hard Page 126 22. …….. Represents the ratio of concentrated or stock material to the total final volume of a solution and consists of the volume or weight of the concentrate plus the volume of the diluent, with the concentration units remaining the same .
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