Question

section 1: lab equipment and microscopes (multiple choice)
circle the correct answer and write the correct letter on the line.
1 which piece of equipment measures liquid volume most accurately?
a. beaker b. graduated cylinder c. flask d. petri dish
2 which tool is used to hold test tubes during heating?
a. tongs b. clamp c. test tube holder d. scoopula
3 what part of the microscope adjusts focus on low power?
a. coarse adjustment b. fine adjustment c. eyepiece d. diaphragm
4 what part supports the slide on a microscope?
a. base b. stage c. arm d. objective
5 what magnification does a 10x ocular lens with a 40x objective provide?
a. 400x b 100x c. 50x d. 10x
6 what is the correct way to carry a microscope?
a by the base only b. by the eyepiece c. by the arm and base d. by the objecti
7 which lab tool would you use to transfer small amounts of liquid?
a. dropper pipette b. flask c. tongs d. balance

Explanation:

1. A graduated cylinder has precise markings for measuring liquid volume accurately compared to a beaker (less precise), flask (not mainly for volume measurement), and Petri dish (for culturing, not volume).
2. A test tube holder is specifically designed to hold test tubes during heating. Tongs are for gripping larger items, a clamp can be used in some setups but test tube holder is more direct, and a scoopula is for transferring solids.
3. The coarse adjustment knob is used to adjust focus on low - power in a microscope. The fine adjustment is for high - power refinement, the eyepiece is for viewing, and the diaphragm controls light.
4. The stage of a microscope supports the slide. The base is for stability, the arm is for carrying (along with base), and the objective is a lens.
5. Total magnification of a microscope is calculated by multiplying the ocular lens magnification by the objective lens magnification. So, \(10\times40 = 400\).
6. The correct way to carry a microscope is by the arm (for support) and base (for stability). Carrying by base only is not secure, by eyepiece can damage it, and by objective is incorrect.
7. A dropper pipette is used to transfer small amounts of liquid. A flask is for holding larger volumes, tongs for gripping, and a balance for measuring mass.

Answer:

1. B. Graduated Cylinder
2. C. Test Tube Holder
3. A. Coarse Adjustment
4. B. Stage
5. A. 400x
6. C. By the arm and base
7. A. Dropper pipette