What is the primary difference between a CD and a DVD? MCQ with Answer and Explanation

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What is the primary difference between a CD and a DVD?

A. CDs store more data than DVDs

B. DVDs are older technology

C. CDs are read-only; DVDs are rewritable

D. DVDs use a shorter wavelength laser, allowing higher density

Answer: Option D

Solution (By JKSSB Mock Tests)

DVDs use a shorter wavelength laser (650 nm vs 780 nm for CDs), which allows smaller pits and tighter tracks, resulting in higher storage capacity (4.7 GB vs 700 MB).

This question belongs to: Computer Memory and Storage Devices

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What configuration setting on traditional IDE/PATA hard drives designated which drive controlled the shared data bus ribbon cable?

A. Master/Slave jumper pins

B. BIOS overclock profile

C. Firmware partition flag

D. SATA speed toggle

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Correct Answer: Option A

Explanation:
Legacy IDE/PATA drive architectures required users to set small physical plastic blocks (jumpers) over pins to designate a drive as 'Master' or 'Slave' on a shared ribbon cable.

This question belongs to: Computer Memory and Storage Devices