Lab Safety Quiz: MCQ Exam!
- 1.
The student's used correct lab practice when handling samples of pond water. Which practice is NOT an example of correct lab practice?
- A.
Wearing disposable gloves.
- B.
Discarding samples down the drain
- C.
Disinfecting the lab countertop before and after each lab session
- D.
Washing hands before and after each lab session
Correct Answer
B. Discarding samples down the drainExplanation
Discarding samples down the drain is not an example of correct lab practice because it can lead to contamination of the water supply or cause harm to the environment. Proper disposal methods should be followed to ensure the safety of both the lab personnel and the surrounding environment.Rate this question:
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- 2.
Which technique is NOT a proper procedure for a classroom lab activity?
- A.
Using a compound microscope, first focusing on the specimen using low power, then switching to a higher power.
- B.
Turning on the gas of a Bunsen burner to adjust the gas flow, then striking a match to test it.
- C.
Determining the odor of a burning substance by fanning, with your hand, the scent from a test tube towards your nose.
- D.
Cleaning up liquid that spilled onto the floor immediately.
Correct Answer
B. Turning on the gas of a Bunsen burner to adjust the gas flow, then striking a match to test it.Explanation
The technique of turning on the gas of a Bunsen burner to adjust the gas flow, then striking a match to test it is not a proper procedure for a classroom lab activity. This is because it poses a safety risk by potentially igniting the gas without proper control or supervision. It is important to prioritize safety in a lab setting and follow established protocols to prevent accidents or injuries.Rate this question:
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- 3.
When Jim used a compound light microscope to study plant cells, he cracked the glass specimen slide. Which microscope technique most likely caused him to crack the slide?
- A.
Using coarse focus with the low power lens.
- B.
Using coarse focus with the high power lens.
- C.
Using the fine focus with the low power lens.
- D.
Using the fine focus with the high power lens.
Correct Answer
B. Using coarse focus with the high power lens.Explanation
Using coarse focus with the high power lens most likely caused Jim to crack the slide. Coarse focus is used to quickly bring the specimen into approximate focus, and it adjusts the stage and objective lens. High power lens provides a higher magnification and requires more precision. Therefore, using coarse focus with the high power lens may have caused excessive force or pressure on the slide, leading to its cracking.Rate this question:
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- 4.
Keiko transfers samples of bacteria from a culture tube to several Petri dishes. Which technique should she use to minimize contamination of the culture?
- A.
Setting the Petri dish lid on the lab table.
- B.
Holding the culture tube upright when the lid is off.
- C.
Disinfecting the lab table before and after the transfer.
- D.
Sliding the transfer pipette along the side of the culture tube.
Correct Answer
C. Disinfecting the lab table before and after the transfer. -
- 5.
Which laboratory safety procedure is most important for a student working with bacterial cultures?
- A.
Storing nutrient agar in a beaker.
- B.
Wearing rubber gloves and a lab coat.
- C.
Using warm water to clean glassware.
- D.
Recording data neatly in a notebook.
Correct Answer
B. Wearing rubber gloves and a lab coat.Explanation
Wearing rubber gloves and a lab coat is the most important laboratory safety procedure for a student working with bacterial cultures because it helps to prevent the student from coming into direct contact with the bacteria, reducing the risk of contamination and potential infection. The lab coat provides a barrier to protect the student's clothing from spills and splashes, while the gloves protect the student's hands from direct contact with the cultures. This safety measure is crucial in preventing accidents and maintaining a sterile environment in the laboratory.Rate this question:
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- 6.
You may eat or drink during a laboratory activity.
- A.
After you have washed your hands.
- B.
Never.
- C.
From laboratory equipment.
- D.
At any time.
Correct Answer
B. Never.Explanation
Eating or drinking during a laboratory activity is generally not allowed for safety reasons. Consuming food or beverages in the lab can lead to contamination of samples, equipment, or chemicals, potentially causing inaccurate results or hazardous reactions. Additionally, ingesting harmful substances accidentally is a risk when eating or drinking in the lab. Therefore, it is best to avoid eating or drinking in the laboratory at all times.Rate this question:
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- 7.
What should you do with your waste chemicals from your lab when you are done performing the experiment?
- A.
Pour it down the drain
- B.
Leave it in the container you have it in
- C.
Pour it back into the original container
- D.
Deposit it in appropriate waste beakers in the front of the room, unless your teacher tells you it is safe to pour the contents down the drain
Correct Answer
D. Deposit it in appropriate waste beakers in the front of the room, unless your teacher tells you it is safe to pour the contents down the drainExplanation
It is important to deposit waste chemicals in appropriate waste beakers in the front of the room, unless the teacher confirms it is safe to pour them down the drain. This is because certain chemicals can be harmful to the environment or cause damage to plumbing systems if poured down the drain. It is always best to follow proper disposal protocols and seek guidance from a teacher or expert to ensure the safe and responsible handling of waste chemicals.Rate this question:
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- 8.
Your notebook accidentally catches fire during an experiment. You should
- A.
Ask your partner where the fire extinguisher is.
- B.
Douse it with the contents of the nearest beaker that contains a liquid.
- C.
Notify your teacher at once.
- D.
Both a and c.
Correct Answer
C. Notify your teacher at once.Explanation
In case of a fire accident during an experiment, it is crucial to prioritize safety and inform the teacher immediately. They are trained to handle such situations and can take appropriate action to ensure the safety of everyone involved. Asking your partner about the fire extinguisher might waste valuable time, and attempting to douse the fire with a liquid from a beaker could potentially worsen the situation or cause harm. Therefore, the best course of action is to promptly notify the teacher.Rate this question:
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- 9.
Your hand is accidentally splashed with a few drops of dilute hydrochloric acid. You should
- A.
Notify your teacher at once.
- B.
Pat your hand dry with a paper towel.
- C.
Flush your hand with running water from a faucet.
- D.
Both a and c.
Correct Answer
D. Both a and c.Explanation
When your hand is accidentally splashed with dilute hydrochloric acid, it is important to take immediate action to minimize any potential harm. Notifying your teacher is crucial because they can provide proper guidance and medical assistance if needed. Additionally, flushing your hand with running water from a faucet helps to dilute and wash away the acid, reducing the risk of further damage. Therefore, both options a and c are recommended for ensuring your safety in this situation.Rate this question:
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- 10.
Your laboratory procedure instructs you to pour six different solutions into separate beakers for use in a chemical test. You should
- A.
Pour all of the solutions into beakers and then label the beakers.
- B.
Pour one solution at a time, labeling each beaker after pouring the solution into it.
- C.
Label all beakers first and then pour the correct solution into each.
- D.
Not worry about labeling the beakers because you will remember which beaker contains each solution.
Correct Answer
C. Label all beakers first and then pour the correct solution into each.Explanation
Pouring all of the solutions into beakers and then labeling them may lead to confusion and mix-up of the solutions. Pouring one solution at a time and labeling each beaker after pouring the solution into it ensures that each solution is correctly labeled. Not worrying about labeling the beakers because you will remember which beaker contains each solution is not a reliable method, as it is easy to forget or mix up the solutions. Therefore, the best approach is to label all beakers first and then pour the correct solution into each to ensure accuracy and avoid any confusion.Rate this question:
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- 11.
You have read about the hazards of the chemicals you will be using in a particular lab, and found out that they are mild health hazards. You should avoid skin contact and vapor inhalation. In lab you should:
- A.
Wear shorts and sandals
- B.
Wear long pants, closed toe shoes, and a lab apron
- C.
Wear gloves
- D.
B and c
- E.
A and c
Correct Answer
D. B and cExplanation
The correct answer is b and c. Wearing long pants, closed toe shoes, and a lab apron is important to protect the skin from any potential chemical splashes or spills. Wearing gloves is also necessary to avoid direct contact with the chemicals and prevent any skin irritation or absorption. Wearing shorts and sandals would leave the skin exposed and increase the risk of injury or chemical exposure. Therefore, options b and c are the most appropriate choices to ensure personal safety in the lab.Rate this question:
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- 12.
Treat all microorganisms as if they were:
- A.
Harmful.
- B.
Harmless.
- C.
Dead.
- D.
Antiseptic.
Correct Answer
A. Harmful.Explanation
The statement "Treat all microorganisms as if they were harmful" suggests that it is important to approach all microorganisms with caution and take necessary precautions, regardless of whether they are actually harmful or not. This approach ensures that one does not underestimate the potential risks associated with microorganisms and helps in preventing the spread of infections and diseases.Rate this question:
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- 13.
To enhance laboratory safety, how should students begin a new laboratory activity?
- A.
Wait until other students begin and then follow their lead.
- B.
Gather supplies immediately and read the directions as needed.
- C.
Begin immediately and gather supplies as needed.
- D.
Read the laboratory exercise and gather supplies before beginning.
Correct Answer
D. Read the laboratory exercise and gather supplies before beginning.Explanation
To enhance laboratory safety, students should read the laboratory exercise and gather supplies before beginning a new laboratory activity. This allows students to familiarize themselves with the instructions and safety precautions, ensuring they understand the procedures and potential hazards involved. By gathering supplies beforehand, students can also ensure they have all the necessary materials and equipment, reducing the risk of accidents or delays during the activity. This approach promotes a systematic and cautious approach to laboratory work, prioritizing safety and minimizing the chances of errors or mishaps.Rate this question:
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- 14.
In the picture below, which of the following procedures is unsafe?
- A.
The students are looking at each other.
- B.
The boy is using tongs to heat the test tube.
- C.
The girl has her hair tied back.
- D.
All of the above
- E.
None of the above
Correct Answer
A. The students are looking at each other.Explanation
The students looking at each other is the unsafe procedure because it indicates that they are not paying attention to the experiment. This can lead to accidents or mistakes that could compromise their safety. The other procedures mentioned, such as the boy using tongs to heat the test tube and the girl having her hair tied back, are both safe practices that promote safety and prevent potential hazards.Rate this question:
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- 15.
In the picture below, what are the students doing incorrectly?
- A.
Labeling chemicals
- B.
Reaching across a flame
- C.
Wearing goggles
- D.
Both a and b
- E.
Both b and c
Correct Answer
D. Both a and bExplanation
The students in the picture are doing two things incorrectly. Firstly, they are reaching across a flame, which is dangerous as it can result in burns or accidents. Secondly, they are incorrectly labeling chemicals, which is important for safety and proper identification. Therefore, the correct answer is both a and b.Rate this question:
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Aug 20, 2024Quiz Edited by
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Jul 29, 2013Quiz Created by
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