ACTIVITY 4
Multiple choice. Choose the letter of the correct answer
1. Which medical instruments make use of sound energy to detect
abnormalities of internal organs?
a lasers and x-rays
b. scanning machines
d. thermometer and lens
c. stethoscope and ultrasound machine
2. Sound is made by
1. Colliding objects
Vibrating objects
III. Heated Objects
a. I only
b. II only
c. I and II
d. I, II, and III
3. Why is sound used for taking pictures of babies inside the womb?
a. Sound is the least harmful among sound, light and heat.
b. The babies inside the womb can already hear sounds, but cannot see yet.
c. Light will not pass through the mother's skin and flesh, while heat will just
be absorbed and will not be reflected.
d. Sound can be transmitted safely through human tissues and fluids, and can
be reflected back to be used for imaging.
4. Sound travel FASTEST through which medium?
a. Solid
c. Liquid
b. Gas
d. Empty space
5. Why do we not hear sound in outer space?
a. There is no one out there to hear it.
b. It is so cold.
c. It is a vacuum or empty space so there is no medium for sound to travel.
d. There are too many stars that are exploding.






Activity 5: SOUNDS I HEAR
A. Give three sounds that signal emergency.
2.
3.
B Which natural sound do you like most and why?_______________


Sana po masagutan please po kailangan na po tlga eh salamat po​