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Q:

There are fourteen juniors and twenty-three seniors in the Service Club. The club is to send four representatives to the State Conference. If the members of the club decide to send two juniors and two seniors, how many different groupings are possible ?

A) 23024	B) 24023
C) 23023	D) 25690

Answer & Explanation Answer: C) 23023

Explanation:

Choose 2 juniors and 2 seniors.

$14 C_{2} * 23 C_{2} = 23023$

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Filed Under: Permutations and Combinations

Q:

A team of 8 students goes on an excursion, in two cars, of which one can seat 5 and the other only 4. In how many ways can they travel?

A) 126	B) 240
C) 120	D) 260

Answer & Explanation Answer: A) 126

Explanation:

There are 8 students and the maximum capacity of the cars together is 9.

We may divide the 8 students as follows

Case I: 5 students in the first car and 3 in the second Or

Case II: 4 students in the first car and 4 in the second

Hence, in Case I: 8 students are divided into groups of 5 and 3 in $8 C_{3}$ ways.

Similarly, in Case II: 8 students are divided into two groups of 4 and 4 in $8 C_{4}$ ways.

Therefore, the total number of ways in which 8 students can travel is

$8 C_{3} + 8 C_{4}$ = 56 + 70 = 126.

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Filed Under: Permutations and Combinations

Q:

In how many ways can the letters of the word "PROBLEM" be rearranged to make 7 letter words such that none of the letters repeat?

A) 49	B) 7!
C) 7^7	D) 7^3

Answer & Explanation Answer: B) 7!

Explanation:

There are seven positions to be filled.

The first position can be filled using any of the 7 letters contained in PROBLEM.

The second position can be filled by the remaining 6 letters as the letters should not repeat.

The third position can be filled by the remaining 5 letters only and so on.

Therefore, the total number of ways of rearranging the 7 letter word = 7*6*5*4*3*2*1 = 7! ways.

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Q:

Which among the following is the relationship constraints

A) Cardinality ratio	B) Participation constraints
C) Both A and B	D) None of the above

Answer & Explanation Answer: C) Both A and B

Explanation:

Both of them are relation ship constraints

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Filed Under: Database
Job Role: Database Administration

Q:

The relationship where both the participating entities belong to same entity type is called

A) Participation	B) Recursive
C) Standard	D) Normal

Answer & Explanation Answer: B) Recursive

Explanation:

The relationship where both the participating entities belong to same entity type is called Recursive relationship

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Filed Under: Database
Job Role: Database Administration

Q:

The no of entities participating in a relation is called

A) Relation	B) Degree of relationship
C) Recursive relationship	D) None of the above

Answer & Explanation Answer: B) Degree of relationship

Explanation:

The no of entities participating in relation is called Degree of relationship

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Filed Under: Database
Job Role: Database Administration

Q:

What are different types of DBMS?

Answer

1. DBMS

2. RDBMS (Relational)

3. ORDBMS (Object Relational)

4. DDBMS (Distributed)

5. FDBMS (Federated)

6. HDDBMS (Homogeneous)

7. HDBMS (Hierarchical)

8. NDBMS (Networked)

Workspace

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Subject: Database
Job Role: Database Administration

Q:

The capacity to change the conceptual schema without having to change external schemas or application programs is called

A) Physical Data Independence	B) Logical Data Independence
C) Both A and B	D) None

Answer & Explanation Answer: B) Logical Data Independence

Explanation:

LDI is the capacity to change the conceptual schema without having to change external schemas or application programs.

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Filed Under: Database
Job Role: Database Administration

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