__________ it is critical to correctly introduce and demonstrate laboratory equipment use.

• A) To impress colleagues
• B) To keep up with current trends
• C) To comply with government restrictions
• D) For experiment safety, efficiency, and accuracy

Which type of process is involved in decontamination that removes or destroys contamination using chemicals?

• A) Ultrasonication
• B) Sterilization
• C) Disinfection
• D) Physical cleaning

_____________ is the motive of a Biological Safety Cabinet (BSC) in biotechnology laboratories.

• A) To shield researchers from biological risks
• B) To behavior DNA sequencing
• C) To store chemicals properly
• D) To hold a comfortable temperature in the lab

The principal function of laboratory apparatus and glassware is____________.

• A) Aesthetic presentation
• B) Cooking utensils
• C) Interior design
• D) Scientific investigation

To achieve accurate and precise results, ____________ of the following is required when preparing a solution.

• A) Estimating quantities of chemicals approximately
• B) Measuring volumes and masses carefully
• C) Using dirty glassware
• D) Mixing chemicals haphazardly

How is decontamination defined?

• A) The confinement within a defined space
• B) A combination of processes that removes or destroys contamination
• C) The destruction of contamination
• D) The initiation of infection

What is a buffer solution?

• A) A solution that can resist pH change upon the addition of acidic or basic components
• B) A solution with added acid or base
• C) A solution with a constantly changing pH
• D) A strong base solution

The correct way to dispose of sharps in the lab is:

• A) Putting them in designated sharps disposal containers
• B) Placing them in biohazard bags
• C) Throwing them in general waste bins
• D) Soaking them in bleach overnight

What is the recommended procedure for decontaminating work benches?

• A) Spray with ethanol and leave to dry
• B) Wipe with 10% bleach followed by water
• C) Wipe with dry tissue and close the bench
• D) Wash thoroughly with soap and warm water

Differentiate between containment and decontamination.

• A) Containment is the removal of contaminants, while decontamination is the confinement within a defined space.
• B) Containment is the initiation of infection, while decontamination is the destruction of infectious agents.
• C) Containment is the destruction of contaminants, while decontamination is the removal of infectious agents.
• D) Containment is the confinement within a defined space, while decontamination is a combination of processes that removes or destroys contamination.

What is the purpose of micrometers in micrometry?

• A) To magnify the object
• B) To observe objects under a microscope
• C) To provide special lighting for microscopic observation
• D) To calibrate against scales for precise measurement of the object

Explain the principle of autoclaving in heat sterilization

• A) Autoclaving involves direct exposure to flames
• B) Autoclaving uses dry heat to kill microbes
• C) Autoclaving relies on radiation for sterilization
• D) Autoclaving utilizes steam under pressure to achieve high temperatures

How does a hot air oven achieve sterilization?

• A) By exposing materials to radiation
• B) By using chemicals
• C) By maintaining a constant temperature using hot air
• D) By boiling the materials

Which part of the microscope controls the amount of light entering and is adjusted based on the nature of the specimen?

• A) Adjustment knobs
• B) Objective lenses
• C) Mechanical stage
• D) Iris diaphragm

Which types of radiations are used for non-ionic radiation sterilization?

• A) Ultraviolet radiations
• B) Ionizing radiations
• C) Radioactive radiations
• D) X-rays and γ-rays

What is Relative Centrifugal Force (RCF) or g-force?

• A) A technique for growing bacteria
• B) A method of purifying DNA
• C) A measure of nutrient density
• D) A measurement of the gravitational force exerted on a sample during centrifugation

How does methylene blue help measure yeast viability?

• A) It stains all yeast cells blue.
• B) It measures the dimensions of yeast cells.
• C) It stains dead yeast cells colorless.
• D) It stains live yeast cells blue.

What are the two units of measurement for centrifuges?

• A) Time and distance
• B) Density and force
• C) RPM and RCF
• D) Speed and temperature

What is the purpose of a hemocytometer in bacterial enumeration?

• A) To produce ethanol
• B) To count the number of cells in a specific volume of solution
• C) To measure bacterial cell dimensions
• D) To stain bacterial cells

What is the significance of counting only the cells on the top or right-hand line of a large square when using a hemocytometer?

• A) To avoid counting cells twice
• B) To stain cells with methylene blue
• C) To produce ethanol
• D) To measure cell dimensions accurately