Question

The bus which is used to transfer data from main memory to peripheral device is
a) data bus
b) input bus
c) DMA bus
d) output bus

Answer 1

Ans (A)Data bus

a) data bus used to carries data which needs processing

b) same as data bus

c)DMA bus contains both . data bus and address bus. Here CPU collect memory address via address bus

d)same as data bus

Comments

input and output bus are data bus

DMA is address bus

means a,b,d all three could be answer

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Your answer was correct I believe- but is DMA a bus? DMA is the controller to enable direct memory access for I/O devices so that CPU is free to do something else.

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Here, Address/Data lines are multiplexed for the CPU over a single bus.