Data Science

Graphics Devices

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is used to change active graphic device?
dev.set
dev.int
dev.win
all of the mentioned
Explanation:
You can change the active graphics device with dev.set(<integer>) where <integer> is the number associated with the graphics device you want to switch to.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following system most often don’t have postscript viewer?
Windows
Linux
Mac
All of the mentioned
Explanation:
postscript is older format but it resizes well.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is a bitmap file type?
tiff
svg
pdf
none of the mentioned
Explanation:
TIFF is a computer file format for storing raster graphics images.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Point out the wrong statement.
For quick visualizations and exploratory analysis, usually you want to use the screen device
Functions like xyplot in lattice will not default to sending a plot to the screen device
Not all graphics devices are available on all platforms
None of the mentioned
Explanation:
window function cannot be used on Mac.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Point out the wrong statement.
File devices are useful for creating plots that can be included in other documents or sent to other people
Plots must be created on a graphics device
For file devices, there are vector and bitmap formats
None of the mentioned
Explanation:
For file devices, there are vector and bitmap formats.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Point out the correct statement.
Vector formats are good for line drawings and plots with solid colors using a modest number of points
Vector formats are good for plots with a large number of points, natural scenes or web based plots
The default graphics device is always the screen device
All of the mentioned
Explanation:
Bitmap formats are good for plots with a large number of points, natural scenes or web based plots.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the the following graphic device information is odd man out in the below figure?
quartz
window
unix
x11
Explanation:
unix keyword does not exist with regards to graphics device.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is the second goal of PCA?
data compression
statistical analysis
data dredging
all of the mentioned
Explanation:
The principal components are equal to the right singular values if you first scale the variables.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Point out the correct statement.
On Mac, the screen device is launched with quartz
On Windows, the screen device is launched with wind
On Unix, the screen device is launched with x12
All of the mentioned
Explanation:
On Windows, the screen device is launched with window function.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is alternative technique toprincipal component analysis?
Factor analysis
Independent components analysis
Latent semantic analysis
All of the mentioned
Explanation:
PC’s may mix real patterns.