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1 . A barcode reader emits ---

A. Sounds
B. Commands
C. Lights
D. Magnetic field

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Answer: Option C

Explanation:

A barcode reader is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals. Additionally, nearly all barcode readers contain decoder circuitry that can analyze the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port.

জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা (NSI) এর সহকারী পরিচালক - 03.02.2017

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