Select the false statements: A. ‘CD’ is an example of an optical device. B.…
2025
Select the false statements:
A. ‘CD’ is an example of an optical device.
B. ‘Floppy’ is an example of a magnetic device.
C. ‘Pen drive’ is an example of a magnetic state device.
D. ‘Memory card’ is an example of a crystal state device.
Choose the correct answer from the options given below:
Answer: B. Only C and D — ConceptStorage devices are classified by the physical mechanism used to record and retrieve data. Optical media are read with light, magnetic media encode…
- A.
Only A and B
- B.
Only C and D
- C.
Only B and D
- D.
Only B and C
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Show answer & explanation
Correct answer: B
Concept
Storage devices are classified by the physical mechanism used to record and retrieve data. Optical media are read with light, magnetic media encode magnetised regions, and flash or solid-state media store charge in non-volatile semiconductor cells without a moving magnetic medium.
“Magnetic state” and “crystal state” are not standard storage categories for pen drives or memory cards; both are flash-memory devices.
Application
A CD is an optical storage medium because a laser reads the encoded pattern on the disc, so the CD statement is true.
A floppy disk records data as magnetised regions on a coated flexible disk, so the floppy-disk statement is true.
A pen drive uses non-volatile flash semiconductor memory rather than magnetic storage, so the pen-drive statement is false.
A memory card also uses non-volatile flash semiconductor memory; “crystal state” is not its storage class, so the memory-card statement is false.
Cross-check
The two false statements are therefore the pen-drive statement and the memory-card statement. The pairing “Only C and D” includes both and excludes the two true statements, whereas every other offered pairing includes at least one true statement.
Result: Only C and D.