iJSD Logic Questions

Five people were eating apples, A finished before B, but behind C. D finished before E, but behind B. What was the finishing order?

• CABED

• CABDE

• ABCED

• DECAB

There are three people (Alex, Ben and Cody), one of whom is a knight, one a knave, and one a spy. The knight always tells the truth, the knave always lies, and the spy can either lie or tell the truth. Alex says: “Cody is a knave.” Ben says: “Alex is a knight.” Cody says: “I am the spy.” Who is the knight?

• Cody

• Ben

• Alex

• None of them

There are three people (Alex, Ben and Cody), one of whom is a knight, one a knave, and one a spy. The knight always tells the truth, the knave always lies, and the spy can either lie or tell the truth. Alex says: “Cody is a knave.” Ben says: “Alex is a knight.” Cody says: “I am the spy.” Who is the knave?

• Alex

• Cody

• Ben

• None of them

All sparrows can't fly. All sparrows have legs, though.

• Sparrows can’t fly without legs

• All sparrows that have legs can’t fly

• Sparrows can’t fly and they don’t have legs

• Sparrows can’t fly because they have legs

Some men are European. Europeans have three legs.

• Men have three legs because they’re European

• There are no non-European men with three legs

• Men with two legs are not European

• None of the above

Good supervisors are banished from the sky. Bad supervisors can sing.

• Some bad supervisors can’t sing

• Good supervisors who can fly can also sing

• Some of the good supervisors are actually bad because they can sing

• All answers are incorrect

Men with red noses are prohibited to become presidents. All men have red noses. Thus, no man is allowed to become a president.

• Correct

• Incorrect

Johnny is not in the center, Carol is not on the left, Buffy is not on the right. In what order are they placed?

• Johnny, Carol, Buffy

• Carol, Buffy, Johnny

• Buffy, Carol, Johnny

• Buffy, Johnny, Carol

Some doctors are fools. Some fools are rich. Therefore:

I. some doctors are rich

II. some rich are doctors

• Both of the conclusions are true

• None of the conclusions are true

• Either I or II is true

• None of the above

All flowers are trees. No fruit is a tree. Therefore:

I. No fruit is a flower

II. Some trees are flowers

• Only I. is true

• Both conclusions are true

• Both conclusions are false

• Only II. is true