MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -An optical disk drive uses a laser beam to read the data from the disk as it is spinning. It distinguishes between the pits and lands based on how the light reflects off the recording material. The drive uses the differences in reflectivity to determine the 0 and 1 bits that represent the data.

Detailed explanation-2: -An optical disc is a flat, usually circular disc which encode binary data in the form of pits and lands on a special material on one of its flat surfaces. The lands represent “1” and the pits represent “0” in binary computing.

Detailed explanation-3: -Reading a CD. When the laser hits a pit, most of the light will be scattered and not be returned into the detector, thus registering no voltage. The difference between a pit and a land will be registered as a 1 and no change will be represented as a 0.

Detailed explanation-4: -In computing and optical disc recording technologies, an optical disc (OD) is a flat, usually circular disc that encodes binary data (bits) in the form of pits and lands on a special material, often aluminum, on one of its flat surfaces.

Detailed explanation-5: -Optic Pits (also known as optic nerve pits, optic disc pits, or less commonly optic holes) are congenital defects presumably arising from the failure of fetal fissure closure in embryogenesis.