Direction: Encircle the letter of the correct answer.
1. Which of the following statement is correct?
A. Light always travel in a straight line.
B. heat transfer through liquids is known as radiation.
C. Sound travels faster in air than in solids.
D. Sound cannot travel through air
2. Which of these is a narrow and has powerful beam of light?
A. Laser B. transparent C. opaque objects D. optical fibers
3. How did doctors and certified medicine professionals used laser
in their work?
A. They used to treat certain problems with internal organs, the
eye and the skin.
B. They used it to cut bones, muscles and nerves.
C. They used it to cure ailments of the body.
D. They used it to treat warts, moles and ulcers of the body.
4. In some media, light travels quickly in
A. Air B. solid C. liquid D. glass
5. Why do optical fibers are used in communication, medicine and
industry?
A. It can travel long distances and still focus on a small area
B. it is made up of transparent materials that transmit visible,
ultraviolet and infrared light.
C. It is narrow and has powerful beam of light.
D. It has a great deal of heat energy​