Information Retrieval System MCQs with answers Page - 3

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Q. transaction() does not take the argument

• (A) callback
• (B) success callback
• (C) error callback
• (D) database name

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Correct answer - Option (D)

Explanation:

transction() and readtransaction() are the two methods that take three arguments

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Q. Which method is used to verifythe version number?

• (A) changeversion()
• (B) readtransaction()
• (C) transaction()
• (D) executesql()

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Correct answer - Option (A)

Explanation:

changeversion() method automatically verify version number and it also changes it like doing a schema update. when

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Q. Which object is created for read-only transaction?

• (A) foo object
• (B) sqltransactionsync
• (C) databasesync object
• (D) sqltransaction

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Correct answer - Option (B)

Explanation:

for read-only transaction, we create the object sqltransactionsync. if the first argument is null then we throw sqlexception which is error code 0.

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Q. insertId attribute returns

• (A) column id
• (B) row id
• (C) user’s id
• (D) database id

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Correct answer - Option (B)

Explanation:

insertid attribute returns the row id of the row of the inserted sqlresultset object’s sql statement that is inserted into the database. if multiple rows are inserted then the id of the last row will be returned. if there is no row then invalid_access_err exception will be raised.

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Q. Which error is invoked when SQLTransactionCallback does not execute?

• (A) insertiid
• (B) rows
• (C) rowsaffected
• (D) length

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Correct answer - Option (C)

Explanation:

rowsaffected attribute returns the

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Q. Which of the error is raised when the quantity of data is too much?

• (A) too_large_err
• (B) unknown_err
• (C) timeout_err
• (D) quota_err

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Correct answer - Option (A)

Explanation:

when the quantity of the data returned from the database is very large then too_large_err is invoked. to minimize the data we can use sql “limit” i.e. modifier to reduce the size of the resultant set.

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Q. What is the required argument to openDatabase?

• (A) version number
• (B) database name
• (C) size of a database
• (D) text description

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Correct answer - Option (A)

Explanation:

the required argument to opendatabase is version number. so it is mandatory that you should know the version number before we try to open the database. if we do not pass this argument then an exception is thrown.

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Q. Which attribute is used for getting an individual row?

• (A) results.rows.item(i)
• (B) insertid
• (C) rowaffected
• (D) length

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Correct answer - Option (A)

Explanation:

for getting individual row results.rows.item(i) is used, i denotes the index of the row. it will return the object representation of the row. insertid returns row id but in case of multiple rows, it returns the id of the last row.

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Q. What incorporates data, architectural, interface, and procedural representations of the software?

• (A) design model
• (B) user’s model
• (C) mental image
• (D) system image

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Correct answer - Option (A)

Explanation:

the requirements specification may establish certain constraints that help to define the user of the system, but the interface design is often only incidental to the design model.

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Q. Which of the following determine the least- squares regression line?

• (A) histo()
• (B) lm
• (C) barlm()
• (D) col.max(x)

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Correct answer - Option (B)

Explanation:

lm calls the lower level functions lm.fit.

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