# Test: Binary Logic

## 10 Questions MCQ Test UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making | Test: Binary Logic

Description
Attempt Test: Binary Logic | 10 questions in 10 minutes | Mock test for UPSC preparation | Free important questions MCQ to study UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making for UPSC Exam | Download free PDF with solutions
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Directions (3 -7): Read the question below very carefully and choose the correct answer for the questions that follow: There are two types of inhabitants at Hawaii Islands – X type and Y type. The X type of inhabitants always speaks the truth and the Y type of inhabitants always lie. John says, “I always lie.” Which type of an inhabitant is he?

Solution:
QUESTION: 4

David says, "According to John. I always speak the truth." Which of the following is a correct conclusion?

Solution:
QUESTION: 5

Mike says. "Albert and I are of the same type." Which of the following is a correct conclusion?

Solution:
QUESTION: 6

Rolly says "Soni and I are of different types." Which of the following is a correct conclusion?

Solution:

Different means not the same as another or each other so evidently if Rolly is Type A then Soni would be Type B.

QUESTION: 7

Mike says, "At least one person among Albert and I always lies." What types are Mike and Albert-respectively?

Solution:

Mike says, "At least one person among Albert and I always lies.
Let Assume Mike is Y type of inhabitant who always Lies
then Mike Says . "At least one person among Albert and I always lies"
, we Have already assumed that Milke Always lies Hence Mike is speaking truth by saying  At least one person among Albert and Mike always lies   as Mike Always lies is assumed
Hence our Assumption is Wrong,
=> Mike is not Y type
=>   Mike is X type of inhabitant who always Speak Truth
Now Mike is saying that At least one person among Albert and Mike always lies.
But we Know That Mike always speak truth
hence Albert has to speak always lie
=> Albert is Y  type of inhabitant who always Lies
Mike - X Type  of inhabitant who always Speak Truth
Albert - Y type of inhabitant who always Lies

QUESTION: 8

Directions (8 -10): Refer to the passage below and answer questions given below it.

The inhabitants of the Island of Middle Andaman Island have very bright and interesting lives. Just as we earthlings have continuity in our routine lives, the inhabitants of the Island of Middle Andaman Island have continuity in both their waking lives, as well as their dreams. As a result, the inhabitants of the Island of Middle Andaman Island have great difficulty in knowing whether they are awake or asleep at a given time. However, the inhabitants can be classified into two broad types—Awakers and Asleepers.

An awaker is characterized by the fact that everything they believe while they are awake is true, and everything they believe while they are asleep is false. An Asleeper on the other hand, has the characteristic that everything he believes while asleep is true, and everything he believes while awake is false.

8. The Island has a King, an advisor and a Doctor. At one point, the Doctor believed that his bosses were of different types. Twelve hours later, he changed his state (from sleeping to waking or from waking to sleeping), and he then believed that the King was an Awaker and the Advisor was an Asleeper. What type is the King?

Solution:
QUESTION: 9

With reference to the previous question, what type is the Advisor?

Solution:
QUESTION: 10

At one time, an inhabitant believed that he was both asleep and awake, what was he really?

Solution:

Solution :

The correct option is A.

An awaker is characterized by the fact that everything they believe while they are awake is true, and everything they believe while they are asleep is false. An Asleeper on the other hand, has the characteristic that everything he believes while asleep is true, and everything he believes while awake is false.

 Use Code STAYHOME200 and get INR 200 additional OFF Use Coupon Code

### How to Prepare for UPSC

Read our guide to prepare for UPSC which is created by Toppers & the best Teachers