Which of the following are advantages of Dynamic RAM (DRAM) over Static RAM (SRAM)?

1.They are much less expensive to manufacture than SRAM

2.They consume less power than SRAM

3.They have a higher storage capacity than SRAM

4.They are much faster than SRAM in data access

A1, 2 & 3 only ✓ Correct

B1 & 3 only

C2 & 3 only

D1 & 2 only

Correct answer: (A) 1, 2 & 3 only

Explanation

The advantages of DRAM over SRAM are lower cost, lower power use and higher storage density, which are Statements 1, 2 and 3.

Statement 1 holds because a DRAM cell uses just one transistor and a capacitor, making it cheaper to manufacture.

Statement 2 holds because DRAM draws less power for the same capacity than the transistor heavy SRAM.

Statement 3 holds because the tiny DRAM cell allows far more bits to be packed into the same chip area.

Statement 4 is wrong because SRAM, not DRAM, is the faster memory in data access.

DRAM needs periodic refreshing of its capacitors, whereas SRAM holds data steadily while powered.

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