General knowledge

1. Mirage is the example of

 A. Reflection of light
 B. Refraction of light
 C. Total internal reflection of light
 D. Scattering of light

 Answer - C

 2. Eutrophication is one kind of 

 A. Air pollution
 B. Water pollution
 C. Soil pollution
D. Sound pollution

 Answer - B

 3. Which of the following is a semiconductor? 
 A. Copper
 B. Silver
 C. Aluminum
 D. Germanium

 Answer - D