UGC NET JULY 2018 (Computer Science And Applications Paper-II) (Question 8)
Q8. A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1-bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of the frame buffer is approximately :
(1) 16 frames per second (2) 19 frames per second
(3) 21 frames per second (4) 23 frames per second
Answer: (1) 16 frames per second
Reason : Here 640 pixel wide is width of screen means vertical line on screen and 480 pixels high is means vertical line on screen.
Now width (w) = 640 px and height (h) = 480 px
Total = 640 x 480 = 307200
Color depth = 1-bit/px
Memory required for total pixel = w x h x Color Depth
Memory required for total pixel = 640 x 480 x 1-bit = 307200
1 pixel takes 200 nano second to refresh
To refresh the whole screen = 640 x 480 x 200 ns = 61440000 nano second
For 1 nano second = ____1____ screen
61440000
9
Now Convert nano seconds to second we multiply above value with 10
9
For 1 nano second = ____1____ x 10 = 16.2760 = 16 (Approximately)
61440000
The above solved values is closed to Option (1).
Q8. A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1-bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of the frame buffer is approximately :
(1) 16 frames per second (2) 19 frames per second
(3) 21 frames per second (4) 23 frames per second
Answer: (1) 16 frames per second
Reason : Here 640 pixel wide is width of screen means vertical line on screen and 480 pixels high is means vertical line on screen.
Now width (w) = 640 px and height (h) = 480 px
Total = 640 x 480 = 307200
Color depth = 1-bit/px
Memory required for total pixel = w x h x Color Depth
Memory required for total pixel = 640 x 480 x 1-bit = 307200
1 pixel takes 200 nano second to refresh
To refresh the whole screen = 640 x 480 x 200 ns = 61440000 nano second
For 1 nano second = ____1____ screen
61440000
9
Now Convert nano seconds to second we multiply above value with 10
9
For 1 nano second = ____1____ x 10 = 16.2760 = 16 (Approximately)
61440000
The above solved values is closed to Option (1).
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