1. If an object is red in sunlight? What color is it under pure green light?
 (A)red (B)green (C)yellow (D)black

 3. About afterimage, first we see a red paper, and later we see cyan in the white paper.
 This is because of (A)positive afterimage. (B)negative afterimage.

 4. Why we see cyan in question 3?
 (A)Because our receptors of the red decrease their sensitivity.
 (B)Because our receptors of the cyan decrease their sensitivity.

 5. Which one is correct?
 (A)In CIE color notation, the primary colors are red, green, and blue in real life.
 (B)In Munsell color cycle, some colors opposite to their complementary colors.
 (C)After subtractive mixture, the brightness is the average of colors mixed.
 (D)After additive mixture, the brightness is the average of colors mixed.

 6. What kind of light does CD-ROM use to read data?
 (A)LED (B)laser (C)lamp (D)fire

 7. In visible light, what's the shortest wave length? (1m = 10¹⁰ Å)
 (A)2000 Å (B)3000 Å (C)4000 Å (D)5000 Å

 8. What is electromagnetic wave below?
 (A)water waves (B)radio waves (C)sound waves (D)rope waves

 9. Again! What is electromagnetic wave below?
 (A)alpha ray (B)beta ray (C)gamma ray (D)none of above

 10. Assuming that the distance of the earth and a planet is 9,054,000,000 km.
 How long does light take flying from here to the planet? About
 (A)30180 seconds. (B)20120 seconds. (C)10000 seconds. (D)72000 seconds.

 11. Which color is NOT one of the primary colors of the light?
 (A)red (B)green (C)yellow (D)blue

 12. If a light enters a denser medium, from air to glass, for example, what will happen?
 (A)It will be bent away from the normal. (B)It will be bent toward the normal. (C)total internal reflection (D)It won't move anymore.

 13. We can't stay under burning sun too long, because it's dangerous.
 We might caught skin cancer because of
 (A)gamma ray. (B)infrared. (C)X-ray. (D)ultraviolet.

 14. Which kind of glasses can spread out incident light?
 (A)glasses for nearsightedness (B)glasses for farsightedness (C)sunglasses (D)reading glasses for old people

 15. Who invented a electric light?
 (A)Albert Einstein (B)Tom Cruise (C)Thomas Alva Edison (D)Tiger Woods

 16. About a secondary rainbow, which one is correct?
 (A)It's more obvious than a primary rainbow. (B)It took one reflection and two refraction to form a secondary rainbow. (C)A secondary rainbow. Its red light is at inner, purple light is at outer. (D)Always, if we see the rainbow, we can see the secondary rainbow, too.

 17. Which kind of light has the fastest speed?
 (A)sunlight (B)moonlight (C)laser (D)all of them are the same

 18. We saw "Buzz Light Year" in Toy Story and Toy Story 2. A light year is
 (A)the distance light can run in a year. (B)the time light takes to run in a year. (C)a year that is bright. (D)a toy.

 19. What can light do?
 (A)deliver the power (B)shine the world (C)measure something precisely (D)all of above

 20. Superman can shoot red "light" from his eyes. It can burn the target. What kind of light it might be?
 (A)LED (B)laser (C)stop light (D)fluorescence