Principles of the laboratory, lab math, and instrumentation. 20 Commonly Tested Questions and Answers.

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Principles of the laboratory, lab math, and instrumentation 1. What are the colligative properties of solution? 1. Exert osmotic pressure 2. Freezing point depression 3. Vapor pressure ... elevation 4. Boiling point depression 2. You need to dilute 10 mL of a stock solution with 500 mL of water. What is the resulting concentration if the stock is 205 mg/dL? 1. 4.1 mg/dL 2. 10.25 g/dL 3. 41 g/dL 4. 102.5 mg/dL 3. What plastic is commonly absorbs proteins, dyes, stains, and picric acid? 1. Polypropylene 2. Polycarbonate 3. Polystyrene 4. Polyethylene 4. The transmittance of your sample reads 0.871. What is the Absorbance? 1. 60 2. 0.6 3. 0.06 4. 6 5. Calculate the amount of Epsom salt (MgSO4+7H2O) you would need to prepare a 5% W/V solution 1. 0.07 g 2. 10.2 g 3. 10.2 mg 4. 7.05 mg 6. An electrode with a silver wire coated with silver chloride is considered to be what type of electrode? 1. Coulometry 2. Amperometry 3. Potentiometry 4. Resistivity 7. Name some common reasons for specimen error values 1. Inappropriate test performed 2. Glucose drawn from a diabetic patient 3. Testing Sodium from a tube that is 1/4 full 4. Cations measured from an EDTA sample 8. Densitometry is performed after what test method? 1. Electrophoresis 2. Potentiometry 3. Flow cytometry 4. Mass spectrometry 9. What does a 3 in the blue diamond on the hazardous materials placard mean? 1. Flash point Below 100F 2. Deadly 3. Shock and Heat may detonate 4. Extreme danger 10. What are two methods of purification that create Clinical Laboratory Reagent Water (CLRW)? 1. Reverse osmosis 2. Deionization 3. Distillation 4. Filtration 11. What are the minimum standards for CLRW 1. Resistivity <10 M ohms*cm 2. Organic Carbon < 500 ppb 3. <10 CFU/mL of bacteria 4. Particulates <0.5um 12. A nephelometer is a measure of what? 1. Wavelength of light 2. The amount of light produced by a reaction 3. Diferential affinity between liquid phase and solid phase 4. Scattered light 13. How would you correctly prepare a 1:20 dilution? 1. 200 mL sample + 3.8 L diluent 2. 200 mL of sample + 4 L of diluent 3. 100 mL of sample + 1900 mL of diluent 4. 300 mL of sample + 3000 L of diluent 14. Which of the following statements about Westgard rules are true? 1. 2 values in a row that are both 1.9 SD from the mean are acceptable 2. 4 values on the same side of the mean means that the run should be rejected 3. A value 2.5 SD is automatically accepted 4. One value is +2SD, but passes all other tests, then the next value is -2SD. This test is rejected. 15. Please convert 10 degrees Celsius to Fahrenheit 1. 37 2. 67 3. 50 degrees C 4. 47 16. Where would you find the list of steps to be performed in the event of being exposed to a toxic reagent? 1. Chemical Exposure Plan 2. Chemical Hygeine plan 3. SOP 4. MSDS 17. Calculate the concentration of an analyte using Beer's law when the absorbance of a standard 5 mg/dL solution is 0.537 and the unknown sample is 6.794 1. 6.3 mg/dL 2. 3.9 3. 1.8 4. 13.7 18. What is the type of centrifuge that will give you a button at the bottom of the tube? 1. Swinging bucket 2. Fixed angle rotor 3. Fixed bucket rotor 4. Ultracentrifuge 19. Calculate the Voltage if the current is 2.4 and the resistance is 9 megaOhms 1. 21.9 2. 3.75 3. 1.27 4. 0.266 20. What is the percentage of values located within 2 SD on both sides of the mean? 1. 95.50% 2. 13.60% 3. 68.20% 4. 34.10% [Show More]

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