BASIC HAZARD SYMBOLS
(MCQ)
What does a flame symbol on a chemical label indicate?
A. Toxic substance
B. Flammable substance
C. Radioactive material
D. Corrosive acid
Answer: B
Explanation: The flame symbol warns that the substance can easily catch fire.
(True/False)
Explosive substances are completely safe at all temperatures.
Answer: False
Explanation: They can react violently under heat, shock, or friction.
(True/False)
Toxic substances only affect humans if swallowed.
Answer: False
Explanation: They can also harm through inhalation or skin contact.
(True/False)
Personal protective equipment (PPE) is optional in labs.
Answer: False
Explanation: PPE is required for safety.
(True/False)
Ignoring hazard symbols can lead to accidents.
Answer: True
Explanation: Symbols exist to prevent unsafe handling.
(True/False)
Hazard symbols help prevent lab accidents.
Answer: True
Explanation: They communicate risks clearly to users.
(MCQ)
Which condition increases the risk of flammable substances igniting?
A. Cold temperature
B. Heat or open flame
C. Darkness
D. Low pressure
Answer: B
Explanation: Heat or sparks can trigger combustion.
(MCQ)
Which PPE is essential in handling corrosives?
A. Sandals
B. Gloves
C. No protection
D. Open hair
Answer: B
Explanation: Gloves protect skin from chemical burns.
(True/False)
Lab safety rules are the same in all experiments.
Answer: False
Explanation: Procedures may vary depending on chemicals used.
(True/False)
Risk assessment is part of lab safety.
Answer: True
Explanation: Identifying hazards is essential before experiments.
(MCQ)
What does the skull and crossbones symbol represent?
A. Irritant
B. Flammable
C. Acute toxicity
D. Environmental hazard
Answer: C
Explanation: It indicates substances that can cause serious poisoning or death.
(MCQ)
What symbol represents explosive substances?
A. Flame
B. Bomb exploding
C. Skull
D. Corrosive liquid
Answer: B
Explanation: It indicates substances that may explode under certain conditions.
(MCQ)
What does a corrosive chemical do?
A. Only changes color
B. Burns or destroys tissue/material
C. Freezes instantly
D. Produces light
Answer: B
Explanation: Corrosives can damage skin and metals.
(MCQ)
What is PPE used for?
A. Decoration
B. Protection from hazards
C. Measuring chemicals
D. Heating substances
Answer: B
Explanation: PPE reduces exposure to dangerous substances.
3. (MCQ)
What should you do before using a new chemical?
A. Guess its properties
B. Smell it
C. Mix it immediately
D. Read the label and symbols
Answer: D
Explanation: Labels provide safety information.
(MCQ)
Which symbol warns about substances harmful to the environment?
A. Tree and fish symbol
B. Flame
C. Gas cylinder
D. Exclamation mark
Answer: A
Explanation: It indicates environmental toxicity.
(MCQ)
What is a key safety rule for flammable liquids?
A. Store near sunlight
B. Keep in sealed containers away from heat
C. Mix with water
D. Shake frequently
Answer: B
Explanation: Proper storage reduces fire risk.
(MCQ)
Which is a safety precaution for corrosive substances?
A. Smelling directly
B. Using gloves and goggles
C. Tasting samples
D. Heating openly
Answer: B
Explanation: PPE protects against chemical burns.
(MCQ)
Why should long hair be tied back in a lab?
A. Prevent contact with chemicals or flames
B. Fashion
C. Comfort
D. No reason
Answer: A
Explanation: It reduces accident risk.
(MCQ)
Which action is unsafe in a chemistry lab?
A. Wearing goggles
B. Following instructions
C. Tasting chemicals
D. Using gloves
Answer: C
Explanation: Chemicals should never be tasted
(MCQ)
What does the exclamation mark symbol usually indicate?
A. Explosive
B. Irritant or harmful
C. Radioactive
D. Flammable gas
Answer: B
Explanation: It warns of mild toxicity or irritation.
(MCQ)
Which gas is commonly flammable?
A. Oxygen
B. Hydrogen
C. Nitrogen
D. Carbon dioxide
Answer: B
Explanation: Hydrogen ignites easily in air.
(MCQ)
What should you do if a corrosive chemical spills on skin?
A. Ignore it
B. Wash immediately with water
C. Cover it
D. Heat it
Answer: B
Explanation: Immediate washing reduces damage.
(MCQ)
What is the first thing to do if a chemical is unknown?
A. Taste it
B. Check hazard symbols
C. Heat it
D. Mix it
Answer: B
Explanation: Hazard symbols indicate risks.
(MCQ)
What does “risk” refer to in the lab?
A. Fun level
B. Likelihood of harm
C. Chemical color
D. Temperature only
Answer: B
Explanation: Risk is the chance of danger occurring.