The objective lenses of the compound light microscope are attached to the
Body tube.
Stage.
Base.
Rotating nosepiece.
The Correct Answer is D
Choice A rationale: Body tube is incorrect because the body tube is the part of the microscope that connects the eyepiece to the objective lenses, not the part that holds the objective lenses. The body tube is a hollow cylinder that allows the passage of light from the objective lenses to the eyepiece.
Choice B rationale: Stage is incorrect because the stage is the part of the microscope that supports the slide and the specimen, not the part that holds the objective lenses. The stage is a flat platform that has a hole in the center to allow the light source to illuminate the specimen.
Choice C rationale: Base is incorrect because the base is the part of the microscope that supports the whole microscope, not the part that holds the objective lenses. The base is the bottom part of the microscope that provides stability and balance.
Choice D rationale: Rotating nosepiece is correct because the rotating nosepiece is the part of the microscope that holds the objective lenses and allows them to be changed. The rotating nosepiece is a circular structure that has four or more objective lenses attached to it. The rotating nosepiece can be rotated to switch between different magnifications of the objective lenses.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Benedict's test is a test for the presence of reducing sugars, such as glucose or maltose, in a solution. The test involves adding Benedict's reagent, which is a blue solution of copper (II) sulfate, sodium carbonate, and sodium citrate, to the solution and heating it in a water bath. If reducing sugars are present, they reduce the copper (II) ions to copper (I) ions, which form a red, orange, or green precipitate of copper (I) oxide. The color and amount of the precipitate indicate the concentration of reducing sugars in the solution. ¹
Choice B reason: Brown paper test is a test for the presence of lipids, such as fats or oils, in a solution. The test involves placing a drop of the solution on a piece of brown paper and letting it dry. If lipids are present, they leave a translucent spot on the paper, which can be seen by holding the paper against a light source. The test is based on the fact that lipids are nonpolar and do not dissolve in water, but can dissolve in organic solvents and stain the paper. ²
Choice C reason: Biuret test is a test for the presence of proteins or peptides in a solution. The test involves adding Biuret reagent, which is a blue solution of copper (II) sulfate and sodium hydroxide, to the solution. If proteins or peptides are present, they form a complex with the copper (II) ions, which changes the color of the solution to violet or pink. The test is based on the fact that proteins and peptides have peptide bonds, which have nitrogen atoms that can coordinate with the copper (II) ions. ³
Choice D reason: Iodine test is a test for the presence of starch in a solution. The test involves adding iodine solution, which is a brown solution of iodine and potassium iodide, to the solution. If starch is present, it forms a complex with the iodine molecules, which changes the color of the solution to blue-black. The test is based on the fact that starch is a polysaccharide that has a helical structure, which can trap the iodine molecules inside. ⁴
Choice E reason: Wendelspecht test is a fictional test that does not exist in reality. It is a made-up name that has no meaning or relevance to the topic of this question. Therefore, it cannot be a valid answer.
Correct Answer is B
Explanation
The total magnification of a microscope is calculated by multiplying the magnification of the objective lens and the magnification of the eyepiece lens. Therefore, using a 10× objective lens with a 10× eyepiece lens would result in a total magnification of 10×10 = 100×, not 20×.
To achieve a total magnification of 20×, one would need to use a 2× objective lens with a 10× eyepiece lens, or a 10× objective lens with a 2× eyepiece lens. Therefore, the statement that the total magnification achieved using a 10× objective lens with a 10× eyepiece lens is 20× is false.
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