Deductive Reasoning Quiz Set 009


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Question 1

  1. All cubs are animals.
  2. Some cubs are dogs.
  3. Female animals lay eggs.

If the first three statements are facts, which of the following statements must also be a fact?

  1. All animals lay eggs.
  2. Some dogs are animals.
  3. Some cubs are not dogs.
 A

I only.

 B

II only.

 C

II and III only.

 D

None.

Soln.
Ans: c

The first statement cannot be true because only female animals lay eggs. Because some dogs are cubs and all cubs are animals, we can say some dogs are animals[II is true]. Similarly, it is given that some cubs are dogs, then some must not be dogs[III is true].


Question 2

  1. Phone A lasts longer than Phone B.
  2. Phone B doesn't last as long as Phone C.
  3. Phone C lasts longer than Phone A.

If the first two statements are true, the third statement is.

 A

true.

 B

false.

 C

uncertain.

 D

none.

Soln.
Ans: c

The first two statements indicate that Phone B lasts the least amount of time, but it cannot be determined if Phone C lasts longer than Phone A.


Question 3

  1. A is to the East of D.
  2. B is to the North of C.
  3. A, B, C and D are arranged in the same cyclic order.

If the first two statements are true, the third statement is:

 A

true.

 B

false.

 C

uncertain.

 D

None.

Soln.
Ans: c

At first study you might have drawn a figure like this.

  B
D---A
 C

But this is also possible.


D---A---B
        C

Question 4

  1. Raman has four cars.
  2. Two of the cars are blue.
  3. One of the cars is a minivan.

If the first three statements are facts, which of the following statements must also be a fact?

  1. Raman has a blue minivan.
  2. Raman has three cars.
  3. Raman's favorite color is blue.
 A

I only.

 B

II only.

 C

II and III only.

 D

None.

Soln.
Ans: d

There is not enough information to support any of the statements. Raman is known to have a minivan, but it is not known which of his car is blue. There is no way to know if Raman's favorite color is blue.


Question 5

  1. Chandigarh is north of Mohali.
  2. Mohali is east of Panchkula.
  3. Panchkula is northwest of Chandigarh.

If the first two statements are true, the third statement is.

 A

true.

 B

false.

 C

uncertain.

 D

none.

Soln.
Ans: b

Because the first two statements are true, Panchkula is west of Mohali and southwest of Chandigarh. Therefore, the third statement is false.


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Updated on 2020-02-07. Published on: 2016-04-03

Posted by Parveen(Hoven),
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