Infosys Logical Reasoning Syllogism Quiz – 1 Questions

Tick & cross Method :

Conclusions: 1. Some pens are pencils. - Possible - Because All pencils are pens.

Conclusions: 2. Some pens are papers. - Possible - Because Some papers are pens.

OR

Note: Here, a conclusion is definite if it can be shown in a diagram drawn with least-possibilities. If a conclusion can’t be shown in least-possibilities diagram then the conclusion is possible but not definite.

On drawing least-possibilities Venn-diagram:

Conclusions:

1. Some pens are pencils. ⇒ It’s, definitely, true.

2. Some pens are papers. ⇒ It’s, definitely, true.

Hence, both 1 and 2 follow

From the given conditions we draw the following least possible venn diagram:

Conclusions: Using tick & cross.

a. All animals which are four legged are birds. (False as it is not definite)

b. All birds are four legged.  (Clearly true as it is definite taking middle term as animal)

c. Some birds are not four legged (False as it is not definite also no negative statement.)

d. Some birds are animals but not four legged (False as it is not definite also if all statements are positive then conclusion can never be negative)

Thus, conclusion (b) is true.

If one gets lucky. One will win the prize. ⇒ All lucky win the prize.

which also means if one does not get lucky, one will not win the prize.

Clearly, the logical order is ‘ac’ ⇒ Ramesh did not get the prize then Ramesh didn’t get lucky. but the logical order 'bd' => Ramesh Got lucky, Ramesh won the prize.

If one succeeds. One makes merry. ⇒ All succeed are Merry.

⇒ One succeeded & one made merry are logical pairs. but vice-vera is also correct according to the statement.

therefore a,b and c,d both are correct.

Note: Here, a conclusion is definite if it can be shown in a diagram drawn with least-possibilities. If a conclusion can’t be shown in least-possibilities diagram then the conclusion is possible but not definite.

On drawing least-possibilities Venn-diagram:

Conclusions:

I. Yellow is brown. → It’s, clearly, true.

II. Pink is blue. → It’s, clearly, true.

Hence, both I and II follow.

Note: Here, a conclusion is definite if it can be shown in a diagram drawn with least-possibilities. If a conclusion can’t be shown in least-possibilities diagram then the conclusion is possible but not definite.

On drawing least-possibilities Venn-diagram:

Conclusions:

I. Some stones are pearls. ⇒ It’s, definitely, true.

II. All pearls are shells. ⇒ It’s possible but not definite, hence false.

Hence, only I follows.

OR

Tick & cross method :

Conclusions: I. Some stones are pearls. - Possible , taking middle term as shells.

Conclusions: II All pearls are shells. - Not possible, All shells are pearls, vice versa not true.

Note: Here, a conclusion is definite if it can be shown in a diagram drawn with least-possibilities. If a conclusion can’t be shown in the least-possibilities diagram then the conclusion is possible but not definite.

On drawing least-possibilities Venn-diagram:

Conclusions:

I. Some buds are red. ⇒ It’s possible but not definite, hence false.

II. Some leaves are not buds. ⇒ According to the Venn diagram if some buds are leaves then it is understood that some buds are not leaves as well.

Therefore only conclusion II follows.

Note: Here, a conclusion is definite if it can be shown in a diagram drawn with least-possibilities. If a conclusion can’t be shown in least-possibilities diagram then the conclusion is possible but not definite.
On drawing least-possibilities Venn-diagram:

Conclusions:

I. All wheels are hands. ⇒ It’s possible but not definite, hence false.

II. All hands are wheels. ⇒ It’s definitely true.

Hence, only II follows.

OR

TICK & CROSS METHOD :

Taking Statements:

1. All hands are machines.

2. All machines are wheels.

Middle term - machines, we ll get All hands are wheel as a conclusion.

Hence, Conclusions: II. All hands are wheels is correct.

 

From the given statements we draw the following least possible Venn diagram:

Conclusions:

a) All watches of high standard were manufactured by HMT → false as it’s possible but not definite.

b) Some of the HMT watches are of the high standard → clearly true.

c) None of the HMT watches is of the high standard → clearly false.

d) Some of the HMT watches of high standard are sold in that shop→ clearly true. Hence only b and d follow.

From the given statements we draw the following least possible Venn diagram:

From the given conclusions only ‘Some vertebrates are mammals’ is true as it is definite but the other are not definite.