STP Laboratory Practice 2

Question 1

When a chemical spill occurs on the skin in a laboratory, what is the FIRST action to take?

Accepted Answer

Flush the affected area with large amounts of water for at least 15 minutes

Answer

Immediate and prolonged flushing with water dilutes and removes the chemical before it can cause further injury.

Question 2

Which label element is NOT required on a secondary container of a hazardous chemical in a US laboratory under OSHA's Hazard Communication Standard?

Accepted Answer

Manufacturer's full street address

Answer

Secondary container labels require a product identifier and hazard warnings but do not need the manufacturer's full street address.

Question 3

A laboratory worker notices their pipette calibration check is outside the acceptable tolerance range. What should they do?

Accepted Answer

Remove the pipette from service, label it 'OUT OF SERVICE,' and report it for recalibration

Answer

Equipment outside calibration tolerance must be removed from service to prevent erroneous results and ensure data integrity.

Question 4

What is the purpose of a Material Safety Data Sheet (SDS) Section 8?

Accepted Answer

Exposure controls and personal protective equipment requirements

Answer

SDS Section 8 (Exposure Controls/Personal Protection) specifies occupational exposure limits and required PPE.

Question 5

In a cell culture laboratory, what practice BEST prevents cross-contamination between cell lines?

Accepted Answer

Changing gloves and decontaminating the hood between handling different cell lines

Answer

Changing gloves and decontaminating surfaces between cell lines prevents transfer of cells, mycoplasma, or other contaminants.

(STP) Scientist Training Programme Practice Test