UGC NET Computer Science Input / Output Devices Previous Year Questions (PYQs)
Study Stuff for MCA Examinations
Assertion A:
A Raster scan device is a CRT graphic device and can use a television monitor for display.
Reason R:
In Raster scan display the picture is composed of a series of dots. These dots are traced out as a series of horizontal lines. Television works in a similar fashion.
In the light of the above statements, choose the correct answer from the options given below:
Solution
Raster scan display forms an image using many small dots called pixels.
These pixels are scanned line by line from left to right and top to bottom.
Television display also works in a similar raster scanning manner.
So, Assertion A is true.
Reason R correctly explains why raster scan devices can use television monitors.
So, Reason R is also true and it is the correct explanation of Assertion A.
| List I | List II |
|---|---|
| (A) Handshaking | (I) I/O interface informs the CPU that device is ready for transfer |
| (B) Programmed I/O | (II) Requires two control signals working in opposite directions |
| (C) Interrupt-initiated I/O | (III) Has local memory and controls large set of I/O devices |
| (D) I/O processor | (IV) Requires CPU to check the I/O flag and perform transfer |
Solution
So, (A) matches with II.
Programmed I/O requires the CPU to continuously check the I/O flag and perform the transfer.
So, (B) matches with IV.
In interrupt-initiated I/O, the I/O interface informs the CPU that the device is ready for transfer.
So, (C) matches with I.
An I/O processor has local memory and controls a large set of I/O devices.
So, (D) matches with III.
Final matching is:
A-II, B-IV, C-I, D-III
| List I | List II |
| A. 2-D Array Input | I. Liquid Crystal Display |
| B. Transmissive device | II. Flat-bed scanner |
| C. Binary image | III. Camera |
D. 1-D Array input |
IV. Inkjet printer |
Choose the correct answer from the options given below:
Solution
| List-I | Term | List-II | Description |
|---|---|---|---|
| (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) | require control signals to be transmitted between the communicating units |
| (d) | Asynchronous data transfer | (iv) | resolve the difference in central computer and peripherals |
Solution
Isolated I/O uses separate instructions for I/O and memory communication.
So, (a) $\rightarrow$ (ii)
Memory mapped I/O uses same set of control signals for I/O and memory communication.
So, (b) $\rightarrow$ (i)
I/O interface resolves the difference between central computer and peripherals.
So, (c) $\rightarrow$ (iv)
Asynchronous data transfer requires control signals to be transmitted between communicating units.
So, (d) $\rightarrow$ (iii)
Hence, correct matching is:
$(a)-(ii),\ (b)-(i),\ (c)-(iv),\ (d)-(iii)$
A. I/O Module
B. I/O processor
C. I/O Channel
D. DMA
Choose the correct answer from the options given below.
Solution
DMA is more advanced because it transfers data directly between memory and I/O device.
I/O Channel is more complex than DMA because it can control I/O operations more independently.
I/O Processor is the most complex because it is a specialized processor for I/O operations.
Increasing order:
$A,\ D,\ C,\ B$
UGC NET Computer Science
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and More.
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UGC NET Computer Science
Online Test Series, Information About Examination,
Syllabus, Notification
and More.
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