b) B c) C d) E 14.On the image,which letter represents the coarse adjustment knob? a) B -b) C c) D d) W 15.On the image,which letter represents the stage? a) A b) B c) AB d) E 16.On the image,which letter indicates the location of the diaphragm? a) C b) D c) E d) AC 17. What helps the lenses of the light microscope achieves an ideal magnification or resolution? a) Proper staining b) Proper sterilization c) Proper focusing (-d) Proper immersion oil 18.The lens that is within the eyepiece of the light microscope is called the: a) Scaning b) Low power c) High power d) Ocular 19. Why do we use heat fixation on microscope slides? a) To enhance the contrast between the specimen and the background b) To kill and immobilize the microorganisms on the slide c) To prevent distortion and shrinkage of the specimen -d) all the above 20. Which physical method is commonly used for sterilization? -a) Autoclaving at 121^circ C and 15 lb for 15 minutes b) Spraying with disinfectant c) Wiping with alcohol wipes d) Exposing to high -intensity ultraviolet (UV) light 21. Why are agar plates commonly inverted upside down in the laboratory? a) To prevent condensation from dripping onto the agar surface b) To allow better air circulation around the colonies c) To make it easier for sterilization d) All of the above

14. On the image, which letter represents the coarse adjustment knob?<br />a) B<br />b) C<br />c) D<br />d) W<br /><br />Answer: b) C<br /><br />15. On the image, which letter represents the stage?<br />a) A<br />b) B<br />c) AB<br />d) E<br /><br />Answer: a) A<br /><br />16. On the image, which letter indicates the location of the diaphragm?<br />a) C<br />b) D<br />c) E<br />d) AC<br /><br />Answer: b) D<br /><br />17. What helps the lenses of the light microscope achieve an ideal magnification or resolution?<br />a) Proper staining<br />b) Proper sterilization<br />c) Proper focusing<br />d) Proper immersion oil<br /><br />Answer: d) Proper immersion oil<br /><br />18. The lens that is within the eyepiece of the light microscope is called the:<br />a) Scanning<br />b) Low power<br />c) High power<br />d) Ocular<br /><br />Answer: d) Ocular<br /><br />19. Why do we use heat fixation on microscope slides?<br />a) To enhance the contrast between the specimen and the background<br />b) To kill and immobilize the microorganisms on the slide<br />c) To prevent distortion and shrinkage of the specimen<br />d) All of the above<br /><br />Answer: d) All of the above<br /><br />20. Which physical method is commonly used for sterilization?<br />a) Autoclaving at $121^{\circ }C$ and 15 lb for 15 minutes<br />b) Spraying with disinfectant<br />c) Wiping with alcohol wipes<br />d) Exposing to high-intensity ultraviolet $(UV)$ light<br /><br />Answer: a) Autoclaving at $121^{\circ }C$ and 15 lb for 15 minutes<br /><br />21. Why are agar plates commonly inverted upside down in the laboratory?<br />a) To prevent condensation from dripping onto the agar surface<br />b) To allow better air circulation around the colonies<br />c) To make it easier for sterilization<br />d) All of the above<br /><br />Answer: a) To prevent condensation from dripping onto the agar surface