Which of the following statements A-D about Read Only Memory (ROM) are true?…

Concept

Read Only Memory (ROM) is non-volatile semiconductor storage: its contents are fixed when the chip is manufactured or programmed, and they survive a power-off. A ROM read is non-destructive — the circuit senses the stored bits without rewriting them. Because ROM holds the fixed, hardware-level program that a device needs in order to start up and operate, that stored program is called firmware.

Applying the concept to the four statements

• A. "The data stored in ROM is temporary" — false. Temporary (volatile) storage is RAM, which loses everything the instant power is removed. ROM is non-volatile and keeps its contents with no power applied, which is precisely why the boot code lives there and not in RAM.

• B. "It is also known as firmware" — true in the sense that standard textbooks and this exam use the term. Firmware is permanent software written into ROM: the BIOS/UEFI boot code, or the control program of a printer or router. Purists do distinguish the chip (ROM) from the program held inside it (firmware); introductory computing and UGC NET material nevertheless treat "ROM" and "firmware" as interchangeable names for that permanently stored program, and this statement follows that standard usage.

• C. "The contents don’t change even if it is read many times" — true. Reading a ROM cell only senses its state; nothing is written back, so the operation is non-destructive and any number of reads leaves the stored pattern exactly as it was.

• D. "EPROM is a type of ROM that can be erased by exposing it to ultraviolet rays" — true. An EPROM (Erasable Programmable ROM) is packaged with a quartz window over the die; ultraviolet light through that window drains the charge from the floating gates, returning every cell to its erased state so the chip can be reprogrammed.

Statements B, C and D are the true ones and A is false, so the true set is B, C and D only.

Cross-check: the ROM family

Every member of the family is non-volatile, which is what rules statement A out; the members differ only in how they are written and erased.

Non-volatility is shared across the whole family, so a claim of temporary storage fails for ROM in every form, while the firmware naming, the non-destructive read and the ultraviolet erasure of EPROM all hold.