Which of the following tools can be used to measure the turbidity of a liquid by measuring the transmission of light through the sample?
Centrifuge
Spectrophotometer
Microdensitometer
Electrophorometer
The Correct Answer is B
The correct answer is b. Spectrophotometer. A spectrophotometer is a tool that can be used to measure the turbidity of a liquid by measuring the transmission of light through the sample. Turbidity is a measure of the cloudiness or haziness of a liquid caused by the presence of suspended particles. A spectrophotometer measures the amount of light that passes through the sample and compares it to the amount of light that passes through a reference sample to determine the turbidity.
a. A centrifuge is a tool used to separate components of a mixture based on their densities, not to measure
turbidity.
c. A microdensitometer is a tool used to measure the optical density of an image, not to measure turbidity.
d. An electrophorometer is a tool used to separate charged particles based on their size and charge, not to measure turbidity.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
The correct answer is c. 100,000. The pH scale is a logarithmic scale, which means that each change of one pH unit represents a tenfold change in the hydrogen-ion concentration. A pH 4 solution has a hydrogen-ion concentration that is 10^5 (or 100,000) times greater than that of a pH 9 solution.
A. 0.00001 is the hydrogen-ion concentration of a pH 9 solution as compared with a pH 4 solution.
B. 5 is the difference in pH units between a pH 4 solution and a pH 9 solution.
D. 50 is not the correct answer.
Correct Answer is A
Explanation
The sequence of bases on the complementary strand of DNA would read 5' TCGATCGCA 3'. In DNA, the nitrogenous bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The complementary strand is also antiparallel to the original strand, meaning that it runs in the opposite direction with the 5' end matching up with the 3' end of the original strand. The other options do not accurately represent the complementary sequence of bases or the antiparallel orientation of the strands.
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