GMAT - Logical Reasoning

GMAT - Logical Reasoning
Question:-
Option (A)
the city should be responsible for providing smoke detectors for apartments
Option (B)
residences outside the city should not be equipped with smoke detectors
Option (C)
only apartments should be equipped with smoke detectors
Option (D)
the risk of fire is not as great in private houses as it is in apartments
Correct Option:
C
Question Solution:
From Jiten's response it is clear that he thought Ajay thinks that only apartments should be equipped with smoke detectors
Question:-
Option (A)
The city of Cephesa is mentioned in a historical work known to have been written in A.D. 400.
Option (B)
Coins bearing the image of an emperor who lived around A.D. 410 have been discovered in the ruins of Cephesa, which were preserved by the cinders and ashes that buried the city.
Option (C)
Geological evidence shows that the eruption of Mt. Amnos in A.D. 415 deposited a 10-foot-thick layer of lava on the city of Cephesa.
Option (D)
Artworks from the city of Cephesa have been found in the ruins of another city known to have been destroyed in A.D. 420.
Correct Option:
B
Question Solution:
(A) is not an answer as Cephesa could have been destroyed in A.D. 310 & still get mentioned in a historical work in A.D. 400
(C) is not an answer as this confirms another eruption in A.D. 415 but not whether a city existed that time
(D) is not an answer as artwork would have gone there before A.D. 310
(B) is the best answer as if empror existed in A.D. 410 that means city also existed that time
Question:-
Option (A)
The new council must have the support of the nation’s labor leaders if it is to succeed.
Option (B)
The chair of the new council must be a person who can communicate directly with the leaders of the nation’s largest labor unions.
Option (C)
Most of the other members of the new council will be representatives of business management interests.
Option (D)
An understanding of the needs and problems of labor is the only qualification necessary for the job of chairing the new council.
Correct Option:
D
Question Solution:
Answer is (D). Reason is simple. A, B & C may or may not be a reason to choose Mr. Sahay for the post but if D is true then Mr. Sahay becomes a clear choice. So (D) would most strengthen the conclusion most.
Question:-
Option (A)
Three of my patients have been harmed by that vaccine during the past three weeks, so the vaccine is unsafe.
Option (B)
Rakhi Jayawant recommends this milk, and I don’t trust Rakhi Jayawant, so I won’t buy this milk.
Option (C)
Costos tennis balls perform best because they are far more effective than any other tennis balls.
Option (D)
I’m buying ABC Vitamins. Doctors recommend them more often than they recommend any other vitamins, so ABC Vitamins must be good.
Correct Option:
C
Question Solution:
Dr.A's argument is that new vaccine is faulty because he feels it is useless/worthless. He does not say any reason for it. This claim is only similar to argument in (C).
Question:-
Option (A)
No French painters are Vorticists.
Option (B)
All Vorticists use acrylic monochromes in their works.
Option (C)
Some French painters do not use acrylic monochromes in their works.
Option (D)
No French painters use acrylic monochromes in their works.
Correct Option:
C
Question Solution:
Every painting in Hoular gallery is by a French painter => some french painters have their paintings at the gallery
No painting in the Gallery is by a Vorticist & Only Vorticists use acrylic monochromes in their works => none of the painting in gallery have acrylic monochromes
=> painters, i.e. some of the french painters, who have painting in gallery, do not use acrylic monochromes in their work.
Question:-
Option (A)
The detergent in the bright carton contained bleach crystals; the detergent in the drab carton did not.
Option (B)
The detergents in the two cartons were the same.
Option (C)
The detergents in the two cartons were different, but they had both been laboratory tested.
Option (D)
The detergent in the drab carton was a popular name brand; the detergent in the bright carton was generic.
Correct Option:
B
Question Solution:
A simple question. Answer is (B) because if both cartons had same detergent then it is clear that customers preferred green & yellow because it is shiny & attractive. That clearly establishes the claim that "packaging has a significant impact on consumers’ judgment of the effectiveness of a laundry detergent".