How many 16K × 1 RAM chips are needed to provide a memory capacity of 128 K-bytes ?

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NIELIT Scientific Assistant IT 5 Dec 2021 Official Paper
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  1. 8
  2. 4
  3. 16
  4. 64

Answer (Detailed Solution Below)

Option 4 : 64
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Detailed Solution

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The correct answer is option 4: 64

Key Points

  • Each 16K × 1 RAM chip stores 16K bits, which is equal to 214 bits.
  • To convert to bytes: 16K bits ÷ 8 = 2K bytes per chip.
  • Required memory = 128K bytes
  • Number of 2K-byte chips needed = 128K ÷ 2K = 64 chips
  • However, each chip is 1-bit wide (16K × 1). To make 1 byte (8 bits), we need 8 chips for each row of addressable memory.
  • So, total number of chips = 64 × 8 = 512 chips

Wait — the question asks about memory **capacity** of 128K-bytes using 16K × 1 chips.

  • Each chip provides: 16K × 1 = 16K bits = 2K bytes
  • To get 128K bytes: 128K ÷ 2K = 64 such chips

Therefore, the correct answer is: option 4: 64

Latest NIELIT Scientific Assistant Updates

Last updated on Jul 3, 2025

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