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Reasoning Aptitude

LOGIC MCQs

Total Questions : 73 | Page 8 of 8 pages
Question 71.

Statements : I. All birds are dogs  II. Some dogs are cats.

Conclusions : I. Some cats are not dogs. II. All dogs are not birds.


  1.    only conclusion I follows
  2.    only conclusion II follows
  3.    either I or II follows
  4.    neither I nor II follows
  5.    both I and II follow
 Discuss Question
Answer: Option D. -> neither I nor II follows

Since the middle term is not distributed even once in the premises, no conclusions follows



Question 72.

Statements : I. Some books are pens.  II. No pen is pencil

Conclusions : I. Some books are pencils.  II. No book is pencil


  1.    only conclusion I follows
  2.    only conclusion II follows
  3.    either I or II follows
  4.    neither I nor II follows
  5.    both I and II follow
 Discuss Question
Answer: Option D. -> neither I nor II follows

Since one premise is negative the conclusion must be negative, So conclusion I cannot follow.
Since one premise is particular, the conclusions must be particular



Question 73.

Statements : I All Planets are moons.  II  All Moons are Stars.

Conclusions : I . All Moons are Planets.  II . All Planets are stars.


  1.    only conclusion I follows
  2.    only conclusion II follows
  3.    either I or II follows
  4.    neither I nor II follows
  5.    both I and II follow
 Discuss Question
Answer: Option B. -> only conclusion II follows

Since both the statements are affirmative, the conclusion must be affirmative. However conclusion cannot follow as it contains the middle term so only conclusion II follows


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