Cardinality specifies the number of instances of one entity that can be associated with each instance of another entity.

In a logistic regression problem an instance is similar to 60 positive instances, 20 negative instances, dissimilar to 30 positive instances, 90 negative instances. What kind of an instance is this?

A

Negative instance

B

Positive instance

C

Cannot be determined, even if the threshold is given

D

Can be determined, if the threshold is given

In an Entity-Relationship (ER) model, suppose ? is a many-to-one relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in ? and that the cardinality of E1 is greater than the cardinality of E2. Which one of the following is true about ??

A

Every entity in E1 is associated with exactly one entity in E2.

B

Some entity in E1 is associated with more than one entity in E2.

C

Every entity in E2 is associated with exactly one entity in E1.

D

Every entity in E2 is associated with at most one entity in E1.

If cardinality of (A U B) = cardinality of A+ cardinality of B. This means ____________

A

A is a subset of B

B

B is a subset of A

C

A and B are disjoint

D

None of the mentioned

In a system, there are three types of resources and four processes that execute concurrently. At the outset, the processes have declared their maximum resource requirements using a matrix named Max as given below. For example, Max[ ] is the maximum number of instances of that would require. The number of instances of the resources allocated to the various processes at any given state is given by a matrix named Allocation. Consider a state of the system with the Allocation matrix as shown below, and in which 3 instances of E and 3 instances of F are the only resources available. Allocation E F G P0 1 0 1 P1 1 1 2 P2 1 0 3 P3 2 0 0 Max E F G P0 4 3 1 P1 2 1 4 P2 1 3 3 P3 5 4 1 From the perspective of deadlock avoidance, which one of the following is true?

A

The system is in safe state.

B

The system is not in state, but would be if one more instance of E were available

C

The system is not in safe state, but would be safe if one more instance of F were available

D

The system is not in state, but would be if one more instance of G were available

Consider the following snapshot of a system running n concurrent processes. Process i is holding Xi instances of a resource R, 1 ≤ i ≤ n. Assume that all instances of R are currently in use. Further, for all i, process i can place a request for at most Yi additional instances of R while holding the Xi instances it already has. Of the n processes, there are exactly two processes p and q such that Yp = Yq = 0. Which one of the following conditions guarantees that no other process apart from p and q can complete execution?

A

X_p + X_q < Min {Y_k | 1 ≤ k ≤ n , k ≠ p, k ≠ q}

B

X_p + X_q < Max {Y_k | 1 ≤ k ≤ n , k ≠ p, k ≠ q}

C

Min (X_p ,X_q) ≥ Min {Y_k | 1 ≤ k ≤ n , k ≠ p, k ≠ q}

D

Min (X_p, X_q) ≤ Max {Y_k | 1 ≤ k ≤ n , k ≠ p, k ≠ q}

A maximum cardinality is the maximum number of entity instances that can participate in a relationship instance.

A

True

B

False

A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.

A

True

B

False

In which of the following can many entity instances of one type be related to many entity instances of another type?

A

One-to-One Relationship

B

One-to-Many Relationship

C

Many-to-Many Relationship

D

Composite Relationship

An entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.This is called as

A

One-to-many

B

One-to-one

C

Many-to-many

D

Many-to-one

In which of the following is a single-entity instance of one type related to many entity instances of another type?

A

One-to-One Relationship

B

One-to-Many Relationship

C

Many-to-Many Relationship

D

Composite Relationship

Cardinality specifies the number of instances of one entity that can be associated with each instance of another entity.

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