MCQs on Disinfection and Sterilization

Which is the most effective method for sterilizing surgical instruments used in the OT?

• Boiling

• UV radiation

• Steam under pressure (autoclave)

• Alcohol rub

What is the recommended disinfectant concentration for cleaning surfaces in the labour room after delivery?

• 5% Lysol

• 70% Alcohol

• 1% Sodium hypochlorite

• 2% Glutaraldehyde

Which instrument requires high-level disinfection rather than sterilization in the labour room?

• Surgical scissors

• Delivery forceps

• Laryngoscope blades

• Scalpel

What is the first step before sterilizing instruments used during delivery?

• Directly placing them in autoclave

• Soaking in phenol

• Cleaning and drying

• Keeping in sterile tray

What is the contact time for 1% sodium hypochlorite when disinfecting delivery tables?

• 2 minutes

• 5 minutes

• 10 minutes

• 30 minutes

What method is preferred for disinfecting labour room mattresses?

• Alcohol spray

• Soaking in detergent

• Cleaning with 1% sodium hypochlorite and sun drying

• Washing with plain water

Which disinfectant is preferred for metal instruments like scissors and clamps used in deliveries?

• Phenol

• 2% Glutaraldehyde

• Alcohol 40%

• Soap water

What is the strength of hypochlorite solution for disinfection of equipment.

• 0.5%

• 1%

• 2%

• 0.1%

Temperature for autoclaving