#1
Which laboratory technique is commonly used to separate components of a mixture based on their solubility?
Centrifugation
Distillation
Chromatography
Titration
#2
What is the purpose of a Bunsen burner in a laboratory?
To measure temperature
To provide illumination
To heat substances
To mix chemicals
#3
Which of the following is a common method for sterilizing laboratory equipment and media?
Autoclaving
Filtration
Incineration
Chemical disinfection
#4
What is the primary purpose of a pipette in a laboratory?
To measure temperature
To mix chemicals
To transfer precise volumes of liquid
To conduct titrations
#5
What is the purpose of a centrifuge in a laboratory?
To measure temperature
To provide ventilation
To separate components of a mixture based on density
To mix chemicals
#6
What is the purpose of a fume hood in a laboratory?
To store chemicals
To provide ventilation and protect users from harmful fumes
To measure temperature
To conduct experiments
#7
Which type of laboratory glassware is used for accurate measurement of liquid volumes?
Beaker
Burette
Flask
Test tube
#8
In titration, what does the endpoint signify?
The beginning of the experiment
The volume of titrant added is stoichiometrically equivalent to the analyte
The conclusion of the experiment
The pH of the solution
#9
Which of the following is a common laboratory technique used for the separation of proteins based on their charge and size?
Gas Chromatography
Ion Exchange Chromatography
HPLC (High-Performance Liquid Chromatography)
Thin-Layer Chromatography (TLC)
#10
What does PCR stand for in the context of molecular biology?
Protein Chain Reaction
Polymeric Chain Reaction
Polymerase Chain Reaction
Proteinase Chain Reaction
#11
What is the primary purpose of a safety data sheet (SDS) in a laboratory setting?
To provide information on lab equipment
To share experimental results
To communicate hazards and safe handling procedures for chemicals
To record daily observations
#12
Which laboratory technique is employed to separate DNA fragments based on their size using an electric field?
Polymerase Chain Reaction (PCR)
Gel Electrophoresis
Western Blot
Mass Spectrometry
#13
What is the purpose of a spectrophotometer in a laboratory?
To measure temperature
To determine the concentration of a substance in a solution
To weigh substances
To observe microscopic organisms
#14
Which laboratory technique is commonly used for the identification of substances based on their mass-to-charge ratio?
Nuclear Magnetic Resonance (NMR)
Mass Spectrometry
Infrared Spectroscopy
Ultraviolet-Visible (UV-Vis) Spectroscopy
#15
What is the purpose of a desiccator in a laboratory?
To measure temperature
To store volatile chemicals
To dry or dehydrate samples
To conduct titrations