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| Q. |
A photostat machine works on – |
| A. | electromagnetic image making |
| B. | electrostatic image making |
| C. | magnetic image making |
| D. | thermal image making |
| Answer» B. electrostatic image making | |
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Explanation: A photocopier uses electrostatic charge to produce a copy. The original document is placed onto a sheet of glass. An image of this page is projected onto a positively charged drum. The drum has a coating which conducts electricity when light falls on it. The parts of the drum which are lit by the projected image losetheir electrostatic charge when they start to conduct. |
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