Logical Venn Diagram
 Which of the following figures represents the relationship among DOG, CAT and PET?

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According to above given question , we can say that
Dog is different from cat.
But both may be pet.
Some dogs and cats may not be pet.Correct Option: D
According to above given question , we can say that
Dog is different from cat.
But both may be pet.
Some dogs and cats may not be pet.
It is clear that option ( D ) represents the best relationship between DOG, CAT and PET . As shown in given venn  diagram .
 Which one of the following diagrams best depicts the relationship among horses, parrots and birds?

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On the basis of above given question , we know that
Parrot is a bird. Horse is an animal.Correct Option: B
On the basis of above given question , we know that
Parrot is a bird. Horse is an animal.
From above it is clear that option ( B ) represents the best relationship between horses, parrots and birds . As shown in given venn  diagram .
 Which one of the following diagrams best depicts the relationship among Pigeons, Birds and Dogs.

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According to above given question , we can say that
Pigeons come under the class Birds.
Dog is a mammal.Correct Option: A
According to above given question , we can say that
Pigeons come under the class Birds.
Dog is a mammal.
It is clear that option ( A ) represents the best relationship between Pigeons, Birds and Dogs. As shown in given venn  diagram .
 Identify the figure which best represents the relationship among Tables, Chairs and Furniture.

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According to above given question , we can say that
Tables are different from chairs.
But both come under the class Furniture.Correct Option: B
According to above given question , we can say that
Tables are different from chairs.
But both come under the class Furniture.
It is clear that option ( B ) represents the best relationship between Tables, Chairs and Furniture. As shown in given venn  diagram .
 In a class, there are 80 students who study both Computer Science and Electronics. While 100 students study Computer Science, 120 students study Electronics. How many of them study Computer Science only?

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According to above given question , we can say that
There are 100 students in Computer Science which include students of electronics too.
Numbers of students who study both Computer Science and Electronics = 80
∴ Number of students opting for Computer Science only = 100 – 80 = 20Correct Option: D
According to above given question , we can say that
There are 100 students in Computer Science which include students of electronics too.
Numbers of students who study both Computer Science and Electronics = 80
∴ Number of students opting for Computer Science only = 100 – 80 = 20
Therefore , 20 students study Computer Science only .