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Previous Year Question (PYQs)



Arrange the following in increasing order of their per unit cost.
(A) DRAM 
(B) Magnetic disk 
(C) Optical disk 
(D) SRAM 
(E) Magnetic tape

Choose the correct answer from the options given below:





Solution

Per unit cost comparison (lowest → highest):

  • (E) Magnetic tape → Cheapest (backup/archive storage)
  • (B) Magnetic disk → Hard disk, inexpensive
  • (C) Optical disk → CD/DVD/Blu-ray, costlier than HDD
  • (A) DRAM → Main memory, more expensive
  • (D) SRAM → Cache memory, fastest and most expensive

Final Order (increasing per unit cost):

E < B < C < A < D



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