Logical Connectivity


Direction: Each question has a main statement followed by four statements labelled A, B, C and D. Choose the ordered pair of statements where the first statement implies the second, and the two statements are logically consistent with the main statement.

  1. Either the orangutan is not angry, or he frowns upon the world.
    A. The orangutan frowns upon the world.
    B. The orangutan is not angry.
    C. The orangutan does not frown upon the world.
    D. The orangutan is angry.









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    It is an example of either a or b type:
    Consider CB it implies - b- a that is logically correct.
    DA - it implies - a → b that is also logically correct.
    AB it implies - a → - b that is logically incorrect.
    Hence both CB and DA are correct.

    Correct Option: D

    It is an example of either a or b type:
    Consider CB it implies - b- a that is logically correct.
    DA - it implies - a → b that is also logically correct.
    AB it implies - a → - b that is logically incorrect.
    Hence both CB and DA are correct.


  1. Either Ravana is a demon, or he is a hero.
    A. Ravana is a hero.
    B. Ravana is a demon.
    C. Ravana is not a demon.
    D. Ravana is not a hero.









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    It is an example of either a or b type:
    CD a → - b that is logically incorrect.
    BA a → b that is also logically incorrect.
    DB b → a that is also logically correct
    CA - a → b that is also logically correct

    Correct Option: D

    It is an example of either a or b type:
    CD a → - b that is logically incorrect.
    BA a → b that is also logically incorrect.
    DB b → a that is also logically correct
    CA - a → b that is also logically correct



  1. Whenever Rajeev uses the internet, he dreams about spiders.
    A. Rajeev did not dream about spiders.
    B. Rajeev used the internet.
    C. Rajeev dreamt about spiders.
    D. Rajeev did not use the internet.









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    Same as above AD is logically correct

    Correct Option: A

    Same as above AD is logically correct


  1. If I talk to my professors, then I do not need to take a pill for headache.
    A. I talked to my professors.
    B. I did not need to take a pill for headache.
    C. I needed to take a pill for headache.
    D. I did not talk to my professors.









  1. View Hint View Answer Discuss in Forum

    Same as above Ab and CD are logically correct.

    Correct Option: D

    Same as above Ab and CD are logically correct.



Direction: Each question consists of a set of numbered statements. Assume that each one of these statements is individually true. Each of the four choices consists of a subset of these statements. Choose the subset as your answer where the statements therein are logically consistent among themselves:

  1. A. Only if the water level in the coastal areas rises, then the people change their lifestyle.
    B. People change their lifestyle only if they are rewarded.
    C. If people are rewarded, then they will not change their lifestyle.
    D. If the temperature rises, then the water level in the coastal areas rises.
    E. Whenever the water level in the coastal area rises, then the temperature rises.
    F. Unless the people change their lifestyle, temperature rises.
    G. People are rewarded.
    H. Water level in the coastal areas does not rise.









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    (H) Water level in the coast area does not rise
    From (D) → Temperature will not rise
    From (F) → People change their lifestyle
    From (B) → People will be rewarded, which is given in G.

    Correct Option: B

    (H) Water level in the coast area does not rise
    From (D) → Temperature will not rise
    From (F) → People change their lifestyle
    From (B) → People will be rewarded, which is given in G.