UGC NET Computer Science December 2019 | Question 137

Question 137

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Match List-I and List-II :

List I	List II
a. Isolated I/O	i. same set of control signal for I/O and memory communication
b. Memory mapped I/O	ii. separate instructions for I/O and memory communication
c. I/O interface	iii. requires control signals to be transmitted between the communicating units
d. Asynchronous data transfer	iv. resolve the differences in central computer and peripherals

Choose the correct option from those given below :

1. 1. (a)-(ii), (b)-(iii), (c)- (iv), (d)-(i)
2. 2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
3. 3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(iii)
4. 4. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

Answer : 3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(iii)

Explanation Question 137

• Isolated I/O → Separate instructions for I/O and memory communication
• Memory mapped I/O → Same set of control signal for I/O and memory communication
• I/O interface → Resolve the differences in central computer and peripherals
• Asynchronous data transfer → Requires control signals to be transmitted between the communicating units

So, option 3 is correct answer

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