Science Form 4 Chap 1-3

Choose all of personal protective equipment on a student

• Google

• Face mask

• Lab coat

• Closed shoes

What is the function of laminar flow cabinet?

• used to avoid contamination when microbiological activities are carried out

• used to carry out experiments that use substances which are volatile, flammable, poisonous, corrosive or pungent

• Used to immediately clean and rinse parts of the body or clothing that have come into contact with chemical substances

• Needed to protect the wearer from danger

What kind of waste substances that can be disposed of into sinks?

• neutral substances

• substances with pH value of 4

• organic solvent compounds

• weak alkalis

Choose biological waste only

• tissue

• culture medium

• gloves

• carcasses

Waste substance are divided to four category.

What is category B?

• Carcasses, organs

• Non-sharp solids

• Liquid

• Sharp equipment

How to manage waste from category C?

• Packaged carefully and temporarily stored in a freezer

• Temporarily stored in a safe place

• Autoclaved and disposed directly into sewage system

• Autoclaved

When carrying out an experiment, your bestfriend spills a type of chemical substance on the table. What's the first things you should do?

Choose the fire extinguishers

• Fire blanket

• Fire extinguisher (water)

• Fire extinguisher (Foam)

• Fire extinguisher (Dry powder)

We've learnt about type of fire. What is class C ?

• Fires that involve fats and oils

• Fires that involve electrical appliances

• Fires that involves liquids

• Fires that involve gases

The label colour of this fire extinguisher is black. This fire extinguisher extinguishes fire that involves electrical appliances, gas and vapour.

Which one in the below matches the characteristics

• Carbon dioxide fire extinguisher

• Foam fire extinguisher

• ABC fire extinguisher

• Dry powder fire extinguisher