Lab Safety Fall 2014

1.

Have you read the safety information presented to you and do you have a reasonable understanding of the rules and best practices that you should abide by in the lab environment?

A.

Yes!
B.

No

Correct Answer
A. Yes!

Explanation
The given correct answer is "Yes!" This implies that the person has indeed read the safety information and has a reasonable understanding of the rules and best practices that should be followed in the lab environment. This indicates that the person is well-prepared and aware of the safety measures necessary to ensure a safe and efficient work environment in the lab.

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2.

**(Multiple Response; 1point) Which of the following would not be appropriate in responding to an emergency?**

A.

Remain calm and call 911.
B.

Report the incident to the lab instructor.
C.

Run screaming from the building and declare martial law.
D.

Turn off all power to the device involved in the incident.
E.

Use water to put out any electrical fires.

Correct Answer(s)
C. Run screaming from the building and declare martial law.
E. Use water to put out any electrical fires.

Explanation
Running screaming from the building and declaring martial law would not be appropriate in responding to an emergency as it would create panic and chaos instead of providing a solution. Additionally, using water to put out electrical fires is not appropriate as water conducts electricity and can lead to electrocution.

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3.

(Multiple Response; 1point) According to the handout, which of the following are listed as having a direct impact on the severity of an electric shock?

A.

The frequency of the current flowing through the body.
B.

The magnitude of the voltage applied across the body.
C.

The magnitude of the current flowing through the body.
D.

The amount of time the current is flowing through the body.

Correct Answer(s)
A. The frequency of the current flowing through the body.
C. The magnitude of the current flowing through the body.
D. The amount of time the current is flowing through the body.

Explanation
The severity of an electric shock is directly impacted by the frequency of the current flowing through the body, the magnitude of the current flowing through the body, and the amount of time the current is flowing through the body.

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4.

(Multiple Choice; 1point) Which one of the following devices is the best circuit protection device to prevent current from traveling from the device, through a person, and then to ground (such that the current coming from the device will be much greater than the current returning to the device)?

A.

A fuse
B.

A circuit breaker
C.

A GFCI
D.

A hard hat

Correct Answer
C. A GFCI

Explanation
A GFCI (Ground Fault Circuit Interrupter) is the best circuit protection device to prevent current from traveling from the device, through a person, and then to ground. It works by constantly monitoring the current flowing through the circuit and quickly shutting off the power if it detects any imbalance or leakage of current. This helps to prevent electric shocks and reduce the risk of electrical fires. Fuses and circuit breakers are designed to protect against overcurrent and short circuits, but they do not provide the same level of protection against ground faults. A hard hat is not a circuit protection device and is unrelated to the prevention of current traveling through a person.

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5.

**(Multiple Choice; 1point) Who is most responsible for the your safety?**

A.

You
B.

The Graduate Assistant
C.

Your Class Instructor
D.

The President of the University

Correct Answer
A. You

Explanation
The correct answer is "You" because ultimately, it is each individual's responsibility to ensure their own safety. While others such as the Graduate Assistant, Class Instructor, or the President of the University may play a role in creating a safe environment, it is up to each person to make choices and take actions that prioritize their own safety.

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6.

When unsure about a particular lab assignment, one should use trial and error with the equipment until they figure it out.

A.

TRUE
B.

FALSE

Correct Answer
B. FALSE

Explanation
The statement suggests that when unsure about a lab assignment, one should use trial and error with the equipment until they figure it out. However, this is not a recommended approach in a lab setting. Using trial and error can be time-consuming, inefficient, and potentially dangerous. It is important to seek guidance from the instructor or lab supervisor when unsure about a lab assignment to ensure safety and accuracy in completing the task.

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7.

What should be done if someone 'freezes' to a live electrical contact?

A.

Shut down the power to the electrical contact.
B.

Hit the person with a piece of lumber to remove them from the contact.
C.

Grab the person and pull them away from the contact.
D.

Act quickly, but throughfully.
E.

Always keep in mind your own safety.

Correct Answer(s)
A. Shut down the power to the electrical contact.
B. Hit the person with a piece of lumber to remove them from the contact.
D. Act quickly, but throughfully.
E. Always keep in mind your own safety.

8.

If someone has a serious injury or an illness that constitutes a medical emergency, one shoud ________ .

A.

immediately move the individual to a location more accessible to paramedics.
B.

Check to see if the individual is breathing.
C.

Control the bleeding of the individual.
D.

remain calm and call 911.

Correct Answer(s)
B. Check to see if the individual is breathing.
C. Control the bleeding of the individual.
D. remain calm and call 911.

Explanation
In the event of a serious injury or illness that constitutes a medical emergency, it is important to check if the individual is breathing. This is crucial as breathing is a vital sign and indicates the person's immediate need for medical attention. Additionally, controlling the bleeding is important to prevent further harm and maintain the person's stability. Remaining calm is essential to make rational decisions and provide clear information when calling 911, ensuring that the appropriate help is dispatched promptly.

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9.

Which of the following accurately describes grounding?

A.

Is the intentional creation of a low resistance path to earth.
B.

Prevents build-up of voltages to prevent electrical accidents.
C.

Stops the flow of current if the current levels get to high.
D.

Interrupts the flow of electricity if the current entering a machine exceeds the current leaving the machine.

Correct Answer
A. Is the intentional creation of a low resistance path to earth.

Explanation
Grounding is the intentional creation of a low resistance path to earth. This is done to provide a safe route for electrical current to flow in the event of a fault or surge. By connecting electrical systems to the earth, grounding helps prevent the build-up of voltages that could lead to electrical accidents. It also helps to stabilize voltage levels and protect equipment from damage.

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10.

Which of the following should you avoid when working in the lab?

A.

Wearing open-toed shoes or sandals
B.

Wearing jewelry
C.

Tying back long hair
D.

Smoking

Correct Answer(s)
A. Wearing open-toed shoes or sandals
B. Wearing jewelry
D. Smoking

Explanation
When working in a lab, it is important to prioritize safety. Wearing open-toed shoes or sandals can expose the feet to potential hazards such as chemical spills or falling objects. Wearing jewelry can also be dangerous as it can get caught in equipment or chemicals, causing injuries. Smoking is strictly prohibited in labs due to the risk of igniting flammable substances and causing fires. Tying back long hair is necessary to prevent it from getting caught in equipment or coming into contact with hazardous substances. Overall, avoiding these actions promotes a safe working environment in the lab.

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11.

Which of the following provides the most electrical insulation? (Assume each is the same size)

A.

A piece of glass
B.

A damp piece of wood
C.

The sub-surface of the earth
D.

A copper wire

Correct Answer
A. A piece of glass

Explanation
Glass is a good electrical insulator because it does not conduct electricity easily. It has a high resistance to the flow of electric current, making it an effective insulating material. In contrast, damp wood can conduct electricity to some extent due to its moisture content. The sub-surface of the earth can also conduct electricity, especially if it contains minerals or moisture. Copper wire, on the other hand, is a conductor and allows electric current to flow easily. Therefore, out of the given options, a piece of glass provides the most electrical insulation.

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