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In a row of boys, Kapil is eighth from the right and Nikunj is twelfth from the left. When Kapil and Nikunj interchange positions, Nikunj becomes twenty first from the left. Which of the following will be Kapil's position from the right ?
  • a)
    8th
  • b)
    17th
  • c)
    21st
  • d)
    Cannot be determined
  • e)
    None of these
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In a row of boys, Kapil is eighth from the right and Nikunj is twelfth...
Since Kapil and Nikunj interchange places
So Nikunj's new position (21st from left) is the same as Kapil's earlier positon (8th from right)
So, number of boys in the row = (20 + 1 + 7) = 28
Now, Kapiil's new position is the same as Nikunj's earlier position i.e. 12th from left
∴ Kapil's position from the right = (28 - 11) = 17th.
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Most Upvoted Answer
In a row of boys, Kapil is eighth from the right and Nikunj is twelfth...
Given Information:
- Kapil is eighth from the right.
- Nikunj is twelfth from the left.
- When Kapil and Nikunj interchange positions, Nikunj becomes twenty-first from the left.

Objective:
To determine Kapil's position from the right after the interchange.

Approach:
To solve this problem, we will use the given information and the concept of relative positions in a row to determine Kapil's position from the right after the interchange.

Solution:
Let's break down the problem into smaller steps:

Step 1: Determine the total number of boys in the row.
- Since Kapil is eighth from the right and Nikunj is twelfth from the left, we can calculate the total number of boys in the row by adding their positions:
Total number of boys = Position of Kapil from the right + Position of Nikunj from the left - 1
= 8 + 12 - 1
= 19

Step 2: Determine Nikunj's position from the right after the interchange.
- We are given that after the interchange, Nikunj becomes twenty-first from the left.
- Since the total number of boys in the row is 19, Nikunj's position from the right after the interchange can be calculated as:
Nikunj's position from the right = Total number of boys - Nikunj's position from the left + 1
= 19 - 21 + 1
= -1

Step 3: Determine Kapil's position from the right after the interchange.
- We know that Kapil and Nikunj interchange positions.
- Since Nikunj's position from the right after the interchange is -1 (as calculated in step 2), Kapil's position from the right after the interchange will be the same as Nikunj's original position from the right.
- Therefore, Kapil's position from the right after the interchange is 8.

Answer:
Kapil's position from the right after the interchange is 8th.
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Passage 2Newtons surprising success at developing the laws of motion, as well as the development and refinement of other physical laws, led to the idea of scientific determinism. The first expression of this principle was in the beginning of the nineteenth century by Laplace, a French scientist. Laplace argued that if one knew the position and velocity of all the particles in the universe at a given time, the laws of physics would be able to predict the future state ofthe universe.Scientific determinism held sway over a great many scientists until the early twentieth century, when the quantum mechanics revolution occurred. Quantum mechanics introduced the world to the idea of the uncertainty principle, which stated that it was impossible to accurately measure both the position and the velocity of a particle at one time. Because Laplaces omniscience could never occur, even in theory, the principle of scientific determinism was thrown into doubt. However, quantum mechanics does allow for a reduced form of scientific determinism. Even though physicists are unable to know precisely where a particle is and what its velocity is, they can determine certain probabilities about its position and velocity. These probabilities are called wave functions. By use of a formula known as the Schrodinger equation, a scientist with the wave function of a particle at a given time can calculate the particles future wave function. These calculations can give the particles position or velocity, but not both. Thus, the physicist is in possession of exactly half ofthe information needed to satisfy Laplaces view ofdeterminism. Unfortunately, under modern physics theories, that is far as any researcher can go in predicting the future.Q. Which of the following, if true, would most strengthen the authors conclusion in the passages final sentence?

Passage 2Newtons surprising success at developing the laws of motion, as well as the development and refinement of other physical laws, led to the idea of scientific determinism. The first expression of this principle was in the beginning of the nineteenth century by Laplace, a French scientist. Laplace argued that if one knew the position and velocity of all the particles in the universe at a given time, the laws of physics would be able to predict the future state ofthe universe.Scientific determinism held sway over a great many scientists until the early twentieth century, when the quantum mechanics revolution occurred. Quantum mechanics introduced the world to the idea of the uncertainty principle, which stated that it was impossible to accurately measure both the position and the velocity of a particle at one time. Because Laplaces omniscience could never occur, even in theory, the principle of scientific determinism was thrown into doubt. However, quantum mechanics does allow for a reduced form of scientific determinism. Even though physicists are unable to know precisely where a particle is and what its velocity is, they can determine certain probabilities about its position and velocity. These probabilities are called wave functions. By use of a formula known as the Schrodinger equation, a scientist with the wave function of a particle at a given time can calculate the particles future wave function. These calculations can give the particles position or velocity, but not both. Thus, the physicist is in possession of exactly half ofthe information needed to satisfy Laplaces view ofdeterminism. Unfortunately, under modern physics theories, that is far as any researcher can go in predicting the future.Q. According to the passage, wave functions

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In a row of boys, Kapil is eighth from the right and Nikunj is twelfth from the left. When Kapil and Nikunj interchange positions, Nikunj becomes twenty first from the left. Which of the following will be Kapil's position from the right ?a)8thb)17thc)21std)Cannot be determinede)None of theseCorrect answer is option 'B'. Can you explain this answer?
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In a row of boys, Kapil is eighth from the right and Nikunj is twelfth from the left. When Kapil and Nikunj interchange positions, Nikunj becomes twenty first from the left. Which of the following will be Kapil's position from the right ?a)8thb)17thc)21std)Cannot be determinede)None of theseCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about In a row of boys, Kapil is eighth from the right and Nikunj is twelfth from the left. When Kapil and Nikunj interchange positions, Nikunj becomes twenty first from the left. Which of the following will be Kapil's position from the right ?a)8thb)17thc)21std)Cannot be determinede)None of theseCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a row of boys, Kapil is eighth from the right and Nikunj is twelfth from the left. When Kapil and Nikunj interchange positions, Nikunj becomes twenty first from the left. Which of the following will be Kapil's position from the right ?a)8thb)17thc)21std)Cannot be determinede)None of theseCorrect answer is option 'B'. Can you explain this answer?.
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