When air is blown from mouth into a test – tube containing lime water, the lime water turned milky due to presence of –a) oxygenb) nitrogenc) water vapoursd) carbon – dioxide
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When air is blown from mouth into a test – tube containing lime water, the lime water turned milky due to presence of –
a) oxygen
b) nitrogen
c) water vapours
d) carbon – dioxide
Step by step
Solved in 2 steps
- Clinical thermometer can be sterilized by boiling. a) True b) FalseDesign a serial dilution of a sample to achieve a A) Final dilution of 10-4 using 9.0 mL blanks B) Final dilution of 10-6 using 99 mL blanks C) Final dilution of 10-6 using 9.0 mL blanksWhich of the following statements is correct about column chromatography? a) Resolution improves as column length increases b) Mobile phase is a porous solid material kept in the column with appropriate chemical characteristics c) Stationary phase is a buffered solution that percolates through the mobile phase d) Large proteins exit the column faster than tiny proteins
- It is possible to measure the number of cells in a broth by measuring the amount of light that goes through the tube. (Spectrophometric analysis). This method measures both live and dead cells. If one measures the same sample by spectrophometric analysis and the spread plate method than a) The CFU>the number calculated by the spectrophometric analysis b) The CFU = the number calculated spectrophometric analysis c) The CFUThe sediment observed in stained blood smear caused by:a) Overstrainingb) More Haematoxylin in the mixturec) Smear was not fixedd) Using non- filtered staine) Using old stainIn which type of chromatography, solvents of increasing polarity are passed through a column of silica gel?a) High performance liquid chromatographyb) Thin layer chromatographyc) Adsorption chromatographyd) Gas-liquid chromatographyA student performs a serial dilution but is not careful about the correct procedures for using the pipet and volumetric flask. Explain how the following errors would affect the concentrations of the diluted solution: a) The pipet is rinsed with water, but not with the solution that is measured. b) The student uses the rubber bulb to force out the liquid remaining in the tip of the pipet into the volumetric flask. c) After carefully mixing the diluted solution in the volumetric flask, the student pours the solution into a beaker that was not carefully rinsed with solution.In which type of chromatography lipids are carried up a silica gel coated pate by a rising solvent front, less polar travels farther than the more polar ones?a) Absorption chromatographyb) Thin layer chromatographyc) Gas-liquid chromatographyd) HPLCWhen loading samples onto a gel, why should expelling all the liquid in the tip be avoided? a)All the sample could be forced out from the well in which it was loaded. b)The extra liquid would end up in the buffer and this would distort the migration of the sample. c)The gel could tear and distort the migration of the sample. d)An air bubble could result which would distort the migration of the sample .In sterilization, which among the supplies, instruments, glassware, etc. under the list of materials can be sterilized using either or both equipment below? List them down under the category: a) For “autoclaving” only, B) For Dry heat oven sterilization ,And C) Can be sterilized with either. Materials: 200-ml Erlenmeyer flask Stove 500-ml Erlenmeyer flask Autoclave 10-mL graduated cylinder Analytical balance 100-ml graduated cylinder pH meter Spatula Stirring rod 100-mL beaker Test tubes Distilled water Petri dish Stirring rod Alcohol lamp Glass dropper11. ● Possible methods for the quantitative determination of sodium bicarbonate for injection are: A) Acidimetry B) Alkalimetry C) Complexometry D) Iodometry E) Refractometry ● Calcium chloride is available in dosage forms: A) Powder for preparation of injections B) Solution for injection 10% in ampoules C) Tablets of 0.3 g D) Solution for injection 25% in ampoules E) Dry dosed powderIn which type of chromatography, solvents of increasing polarity are passed through a column of silica gel?a) High performance liquid chromatography) Thin layer chromatography) Adsorption chromatography) Gas-liquid chromatographySEE MORE QUESTIONS