Data Science Questions and Answers – Reading from Web and APIs – 1

This set of Data Science Multiple Choice Questions & Answers (MCQs) focuses on “Reading from Web and APIs – 1”.

1. Which of the following function is used for loading flat files?
a) read.data
b) read.sheet
c) read.table
d) none of the mentioned
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2. Point out the correct statement.
a) XLConnect package has more options for manipulating access files
b) XLConnect vignette package can also be used for manipulating excel files
c) write.xlsx write out an excel file with different argument
d) None of the mentioned
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3. Which of the following is an important parameter of read.table function?
a) file
b) header
c) sep
d) all of the mentioned
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4. Which of the following will set the character that represents missing value?
a) na.quote
b) na.strings
c) nrows
d) all of the mentioned
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5. Point out the wrong statement.
a) data.table inherits from data.frame
b) data.table is written in Java
c) data.table is faster at subsetting and updating data
d) none of the mentioned
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6. Which of the following package is used for reading excel data?
a) xlsx
b) xlsc
c) read.sheet
d) all of the mentioned
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7. Which of the following can be used to view all the tables in memory?
a) tables
b) alltable
c) table
d) none of the mentioned
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8. Which of the following function programmatically extract parts of XML file?
a) XmlSApply
b) XmlApply
c) XmlSApplyData
d) All of the mentioned
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9. Which of the following package is used for reading JSON data?
a) jsonlite
b) json
c) jsondata
d) all of the mentioned
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10. Extracting XML is the basis for most web scraping.
a) True
b) False
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