Q.1 Why should you never taste chemicals in the lab?
They might be poisonous
They taste bad
They are too hot
They are expensive
Explanation - Chemicals in the lab can be toxic or harmful even in small amounts, so tasting is unsafe.
Correct answer is: They might be poisonous
Q.2 What should you always wear to protect your eyes in the lab?
Sunglasses
Goggles
Reading glasses
Face shield
Explanation - Goggles protect your eyes from chemical splashes and flying objects.
Correct answer is: Goggles
Q.3 What is the first thing you should do if a chemical spills on your skin?
Wipe it with paper
Rinse with plenty of water
Cover it with cloth
Ignore it
Explanation - Rinsing with water helps to dilute and wash away the harmful chemical immediately.
Correct answer is: Rinse with plenty of water
Q.4 Which of these is the safest way to smell a chemical?
Directly inhale
Fan vapors toward your nose
Sniff the container opening
Don’t smell at all
Explanation - The wafting technique prevents strong vapors from entering your nose directly.
Correct answer is: Fan vapors toward your nose
Q.5 Why should long hair be tied back in the lab?
It looks neat
It might catch fire or get into chemicals
Teachers prefer it
It blocks vision
Explanation - Loose hair can dip into chemicals or ignite when near flames.
Correct answer is: It might catch fire or get into chemicals
Q.6 What is the correct way to dispose of broken glass?
Regular trash bin
Glass disposal box
Recycle bin
Leave on the table
Explanation - Broken glass should be disposed of in a designated sharps or glass disposal container for safety.
Correct answer is: Glass disposal box
Q.7 What should you use to heat liquids in the lab?
Plastic cup
Beaker
Paper cup
Glass jar
Explanation - Beakers are made of heat-resistant glass suitable for heating substances.
Correct answer is: Beaker
Q.8 If there is a fire in the lab, what is the first thing you should do?
Run out immediately
Inform the teacher
Pour water immediately
Continue the experiment
Explanation - Teachers are trained to handle lab emergencies quickly and safely.
Correct answer is: Inform the teacher
Q.9 What is a fume hood used for?
Heating liquids
Protecting eyes
Working with harmful vapors
Mixing solutions
Explanation - Fume hoods prevent exposure to dangerous chemical fumes.
Correct answer is: Working with harmful vapors
Q.10 Why should you never run in a laboratory?
It makes noise
You might trip or cause accidents
It distracts others
It damages equipment
Explanation - Running increases the chance of spills, broken glass, or personal injury.
Correct answer is: You might trip or cause accidents
Q.11 What should you do with leftover chemicals after an experiment?
Pour them back in the bottle
Throw in the sink
Follow disposal instructions
Save for later
Explanation - Chemicals must be disposed of according to lab safety rules to prevent contamination.
Correct answer is: Follow disposal instructions
Q.12 Which equipment is used to measure liquid volume accurately?
Beaker
Graduated cylinder
Test tube
Funnel
Explanation - Graduated cylinders are designed for precise measurement of liquids.
Correct answer is: Graduated cylinder
Q.13 What should you do if you break a test tube?
Clean it up with bare hands
Tell the teacher
Kick it aside
Ignore it
Explanation - Broken glass should only be cleaned using safe methods under supervision.
Correct answer is: Tell the teacher
Q.14 Which flame is the hottest in a Bunsen burner?
Yellow safety flame
Blue roaring flame
Orange flame
Red flame
Explanation - The blue flame indicates complete combustion and produces the highest temperature.
Correct answer is: Blue roaring flame
Q.15 Why should you not use chipped glassware?
It looks bad
It may break easily and cause cuts
It is expensive
It cannot be washed
Explanation - Chipped glassware is a safety hazard during experiments.
Correct answer is: It may break easily and cause cuts
Q.16 Which of these should never be worn in the lab?
Closed shoes
Loose jewelry
Lab coat
Safety goggles
Explanation - Loose jewelry can catch on equipment or come into contact with chemicals.
Correct answer is: Loose jewelry
Q.17 What should you do before starting any experiment?
Read the instructions carefully
Ask a friend
Guess the steps
Begin right away
Explanation - Understanding the procedure ensures accuracy and safety.
Correct answer is: Read the instructions carefully
Q.18 What type of extinguisher should be used for electrical fires in a lab?
Water
Foam
CO2
Sand
Explanation - CO2 extinguishers cut off oxygen without conducting electricity.
Correct answer is: CO2
Q.19 Why should food and drinks not be allowed in the lab?
They create a mess
They might react with chemicals
They may get contaminated with chemicals
They distract students
Explanation - Eating or drinking in labs risks chemical ingestion.
Correct answer is: They may get contaminated with chemicals
Q.20 What is the main purpose of a lab coat?
Fashion
Protection from spills
Carrying items
Warmth
Explanation - Lab coats act as a barrier between chemicals and your body.
Correct answer is: Protection from spills
Q.21 What is the correct way to dilute an acid?
Add acid to water slowly
Add water to acid quickly
Mix both at once
Doesn’t matter
Explanation - Adding acid to water prevents violent reactions and splashes.
Correct answer is: Add acid to water slowly
Q.22 What is the first step if your clothing catches fire?
Run outside
Stop, drop, and roll
Shout for help
Throw water on yourself
Explanation - This technique smothers flames by cutting off oxygen.
Correct answer is: Stop, drop, and roll
Q.23 What piece of equipment is used to hold test tubes?
Tongs
Test tube rack
Beaker
Clamp stand
Explanation - A test tube rack safely holds multiple test tubes upright.
Correct answer is: Test tube rack
Q.24 Which chemical symbol warns of corrosive substances?
Skull and crossbones
Test tube spilling liquid on hand
Flame
Exclamation mark
Explanation - The symbol shows corrosive substances that can damage skin or materials.
Correct answer is: Test tube spilling liquid on hand
Q.25 Why should you never pipette by mouth?
It tastes bad
It may cause contamination or poisoning
It is too slow
It wastes chemicals
Explanation - Mouth pipetting can accidentally transfer chemicals into the body.
Correct answer is: It may cause contamination or poisoning