1. The SI unit of electric current is   Mho    Ampere   Ohm   Farad   Hint Half-n-half Clue   2. The high pitched cries of a bat are above human hearing.   True   False   3. What type of lens is a magnifying glass?   Concave   Plano-Concave   Convex   Plane Glass   Half-n-half Clue   4. Bending of light rays when they enter a different medium is known as   Radiation   Reflection   Convection   Refraction   Half-n-half Clue   5. What is the speed of sound in air in meters per second (at a pressure of one atmosphere and temperature of 25oC)?   490   230   330   110   Half-n-half Clue   6. When a spring is released, its potential energy is converted to   Kinetic Energy   Magnetic Energy   Light Energy   Electrical Energy   Half-n-half Clue   7. Which of the following is not a good heat insulator?   Wood   Wool   Iron   Feathers   Half-n-half Clue