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bio156 quiz 3




Question;1;of 25;What property of a compound light microscope enables a person to change objectives without major focusing adjustments?;resolving power;magnification;parfocal;focusing;resolution;Question;2;of 25;How does closing the iris diaphragm affect image brightness and contrast?;decreases both;increases both;decreases brightness and increases contrast;increases brightness and decreases contrast;decreases brightness but has no effect on contrast;Question;3;of 25;Which of the following objectives has the shortest working distance?;4X;10X;45X;100X;Question;4;of 25;What effect will changing from the low power objective to the high power objective have on the field of view of a specimen?;increase;decrease;no effect;Question;5;of 25;If;the letter p is placed under the microscope in the normal reading;position, which of the following orientations of the letter would the;viewer see?;b;p;q;d;Question;6;of 25;Which of the following procedures should be done just prior to adjusting the diopter, when using the compound microscope?;Clean all lenses with lens paper;Turn the light on;Adjust the iris diaphragm;Adjust the fine focus;Question;7;of 25;Two parts of the microscope that regulate the amount of light visible through the ocular are the;fine and coarse adjustment knobs;ocular and objective lenses;illuminator and revolving nosepiece;condenser and iris diaphragm;Question;8;of 25;Initial focusing of any slide is done under the;scanning or low power objective;high power objective;oil immersion objective;depends upon the size of the specimen;Question;9;of 25;Under which magnification would the distance between the objective and the specimen being observed be the least?;40X;100X;450X;1000X;Question;10;of 25;What is the total magnification produced by a microscope, using a 10X ocular lens and a 10X objective lens?;10X;20X;100X;1000X;Question;11;of 25;Which of the following describes proper microscope care and technique.;Be sure to carry the microscope upright, with one hand on the arm and the other under the base.;To protect the optics of the microscope, place it down gently and don't drag it across the tabletop.;Always begin focusing with the lowest power lens available.;Only use the coarse focus knob with the scanning and low power lenses.;All the above are examples of correct microscope care and technique.;Question;12;of 25;Turning which of the following knobs moves the objective lenses the greatest vertical distance?;coarse focus knob;fine focus knob;Question;13;of 25;Resolution is the ability to see two objects as separate.;True;False;Question;14;of 25;Which of the following regulates the amount of light passing through the slide specimen on the microscope stage?;nosepiece;objective lens;iris diaphragm lever;fine focus knob;Question;15;of 25;An increase in magnification causes;a decrease in the field of view.;a decrease in the working distance.;a decrease in the depth of field.;all of the above.;Question;16;of 25;Working distance is the;distance from your house to your job.;distance the microscope nosepiece travels using the coarse focus knob.;distance from the bottom of the objective lens to the specimen.;distance the specimen can travel across the microscope stage.;Question;17;of 25;When;adjusting a binocular microscope for differences between right and left;eyes, focus the microscope with the fine adjustment while viewing only;with the right eye (fixed ocular).;True;False;Question;18;of 25;When using the oil immersion lens, you should raise the objective lenses for easy application of an oil droplet to the slide.;True;False;Question;19;of 25;Why;must a small object seen through the ocular lens be centered in the;field of view, before changing to a higher power objective lens?;to prevent damage to the objective lens;to compensate for the decrease in resolving power of the lens;to prevent its disappearance due to the decrease in the field of view;to prevent eyestrain;Question;20;of 25;A;parfocal microscope allows you to quickly focus using the low power or;scanning lens and then, to switch to a higher power lens with only a;minimal adjustment of the fine focus knob.;True;False;Question;21;of 25;Why is it necessary to adjust the amount of light after changing objective lenses?;Higher magnification lenses require more light.;Proper lighting is needed to see specimen details.;The lens aperture decreases with higher magnification lenses.;All of the above.;Question;22;of 25;Which objective would you use to locate a specimen on a slide?;lowest power available;high power;oil immersion;any of the ojectives could be used with equal success;Question;23;of 25;Which of the following parts of the microscope would increase the depth of field?;ocular;high power objective;fine focus;low power objective;Question;24;of 25;Depth of field is best demonstrated with;a slide showing the letter e.;a slide containing overlapping threads.;the light turned completely off.;the oil immersion lens.;Question;25;of 25;When the letter e slide is viewed with the microscope, it appears;right side up.;right side up and backwards.;upside down.;upside down and backwards.


Paper#63222 | Written in 18-Jul-2015

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