_____18. What charging process involves direct contact by the materials?

a. Charging by conduction
c. charging by induction
b. Charging by friction
d. charging by polarization

______19. The following are true about grounding, EXCEPT

a. Grounding lessens the monthly electrical bill

b. Grounding is discharging the excess charges into the earth

c .Grounding is therapeutic way to ensure safety in case there is a short circuit

d. Grounding protects the appliances, our home and every people when electricity surges.
_______20. What is the main purpose of grounding?

a.To make the material more efficient
b. To make the material electrically neutral
C. To make the material positively charged
d. To make the material negatively charged

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