Information Retrieval System MCQs with answers Page - 7

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Q. Which of the following is not a fundamental quantity?

• (A) length
• (B) angle
• (C) time
• (D) luminous intensity

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Correct answer - Option (B)

Explanation:

derived units are those expressed in terms of fundamental units. primary or

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Q. Which standard is fixed and used for industrial laboratories?

• (A) international standard
• (B) primary standard
• (C) secondary standard
• (D) working standard

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Correct answer - Option (C)

Explanation:

secondary standards are fixed and used in industrial laboratories. working standards as its name suggests is used for day to day measurements. international standards are accepted internationally and primary standards are used in different parts of world which will not be accessible outside for calibration.

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Q. Which of the following error is caused by poor calibration of the instrument?

• (A) random error
• (B) gross error
• (C) systematic error
• (D) precision error

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Correct answer - Option (C)

Explanation:

systematic errors are caused by poor calibration of instruments.

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Q. How systematic errors are eliminated?

• (A) frequent measurement
• (B) replacement of instrument
• (C) finding mean of reading
• (D) finding variance of reading

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Correct answer - Option (B)

Explanation:

the possible way of eliminating systematic error is the replacement of instruments. systematic errors are caused by poor instrument calibration.

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Q. Which of the following represents an SI unit of luminous intensity?

• (A) lumen
• (B) candela
• (C) dioptre
• (D) none of the mentioned

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Correct answer - Option (B)

Explanation:

si unit of luminous intensity is candela represented by cd. luminous intensity is a photometric quantity.

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Q. Starting position of an object is represented as x=5.1±0.2m and finishing position as y=6.9±0.3m. What will be the displacement and error in displacement?

• (A) displacement = 1m, error = 0.5m
• (B) displacement = 2m, error = 0.36m
• (C) displacement = 1.8m, error = 0.36m
• (D) displacement = 1.5m, error = 0.4m

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Correct answer - Option (C)

Explanation:

displacement between two positions represented as x±Δx and y±Δy is iy-xi and error in displacement is (Δx2 +Δy2)1/2.

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Q. The maximum number of indexes on MyISAM table is

• (A) 0
• (B) 1
• (C) 2
• (D) more than 1

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Correct answer - Option (D)

Explanation:

in mysql, for a myisam table, there can be more than one indexes. the data rows of the myisam table are stored in a data file and the index values are stored in a separate index file.

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Q. The data rows of a MyISAM table are stored in

• (A) data file
• (B) index file
• (C) log file
• (D) error file

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Correct answer - Option (A)

Explanation:

the data rows of the myisam table are stored in a data file and the index values are stored in a separate index file. in mysql, for a myisam table, there can be more than one indexes.

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Q. In a single table (with 10 columns) join query the number of values needed to examine per column is

• (A) 1
• (B) 10
• (C) 0
• (D) 2

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Correct answer - Option (B)

Explanation:

for indexing in the context of performing joins, in a single table query, the number of values that are needed to be examined per column is the number of rows in the table.

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Q. FROM tbl_1 INNER JOIN tbl_2 WHERE tbl_1.i1 = tbl_2.i2;

• (A) 14
• (B) 2
• (C) 1
• (D) 48

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Correct answer - Option (D)

Explanation:

in mysql, when the tables are unindexed, the searches are run through all the possible combinations. in this case, the search space is 8 x 6 = 48, the product of the number of rows.

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