When an object blocks the light it forms _____
a. vision b. sunlight c. absorption d. sound


Which of the following ranges means silence?
a. 140 decibel b. 50 decibel c. 60 decibel d. 0 decibel


Which of the of the following is the use of magnets?
a. magnets in compass
b. credit card
c. Compass which guides our way
d. All of the about