Light & Sound — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Why do whales make loud sounds under water?
A) To splash
B) To talk to other whales far away
C) To scare fish
D) To float higher
Whales use loud calls to send messages long distances through the ocean water.
2. Why do rabbits and deer have big ears?
A) To stay warm
B) To hear quiet sounds and danger
C) To look cute
D) To dig holes
Larger ears collect more vibrations, helping animals hear soft or far-off sounds.
3. Why do construction workers wear earplugs?
A) To nap
B) To look cool
C) To protect ears from loud tools
D) To hear better
Strong vibrations from tools can damage ears, so earplugs lower the sound safely.
4. Which place is usually the QUIETEST?
A) A busy street
B) A loud party
C) A soft library
D) A car horn
Libraries stay quiet because people keep voices soft so others can focus.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A fire alarm is very loud so everyone can hear it.
Loud alarms use strong vibrations so people hear them from far away or asleep.
2. We whisper in a library to stay quiet.
Quiet whispers use soft vibrations so they do not disturb other readers.
3. Bats use sound and their ears to find bugs at night.
Bats send out clicks and use their ears to catch the echo that bounces back.
4. A doctor uses a stethoscope to hear soft heart sounds.
A stethoscope carries tiny heart vibrations straight into the doctor's ears.
5. We can hear a friend yelling across a field because sound travels through air.
Sound waves move through the air from the yeller all the way to your ears.