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4. Which of these combines the result of both Left Join and Right Join?
a. Right Outer Join b. Left Outer Join
c. Full Outer Join d. Inner Join

5. Which among the following is a matrix with all elements zero except its leading diagonal?

a. Row matrix b. Column matrix
c. Diagonal matrix d. Unit matrix

6. The is the value that appears most often in a given list of numbers.
a. Mean b. Mode
c. Median d. Difference

7. Which join returns all records from the left table, and the matching records from the right table?
a. Full Join b. Inner Join

c. Right Outer Join d. Left Outer Join

8. The union of sets A = {a, b} and B = {b, c} is:
a. {a, b, c} b. {b}
c. {a, c} d. {a, b}

9. Two matrices can be added only if:
a. They are square matrices b. They have the same number of elements
c. They are of the same order d. They have only numbers

10. What is the sum of vectors A = (2, 3) and B = (4, -1)?
a. (6, 2) b. (2, 4)

c. (-2, 4) d. (1, 1)

B. Fill in the blanks.
1. A is an unordered collection of objects, known as elements or members of the set.

2. A is defined as a list of numbers in one-dimensional form.
3. We need to help turn observations into information and answer questions about
observation samples.

4. is a statistic that measures the degree of dispersion of a data set relative to its average.
5. Vector and operations allow for fast, parallel computations.

C. State whether these statements are true or false.
1. Scalar quantities consist both the magnitude as well as direction.
2. A matrix comprising a single row is known as the row matrix.

3. Mean is the average of all the elements in a dataset.

4. Intersection allows the combination of two or more tables based on common attributes.
5. A database is a collection of data.

142 Touchpad Artificial Intelligence - XI