Class CBSE Class 12 Mathematics Vector Algebra Q #559
KNOWLEDGE BASED
UNDERSTAND
1 Marks 2024 AISSCE(Board Exam) MCQ SINGLE
The vector with terminal point \(A(2,-3,5)\) and initial point \(B(3, 4, 7)\) is:
(A) \(\hat{i}-\hat{j}+2\hat{k}\)
(B) \(\hat{i}+\hat{j}+2\hat{k}\)
(C) \(-\hat{i}-\hat{j}-2\hat{k}\)
(D) \(-\hat{i}+\hat{j}-2\hat{k}\)
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AI Tutor Explanation

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Step-by-Step Solution

To find the vector with initial point \(B(3, 4, 7)\) and terminal point \(A(2, -3, 5)\), we subtract the coordinates of the initial point from the coordinates of the terminal point.

Vector \(\vec{BA} = A - B = (2 - 3, -3 - 4, 5 - 7) = (-1, -7, -2)\)

Now, we express this vector in terms of unit vectors \(\hat{i}\), \(\hat{j}\), and \(\hat{k}\):

\(\vec{BA} = -1\hat{i} - 7\hat{j} - 2\hat{k} = -\hat{i} - 7\hat{j} - 2\hat{k}\)

However, there seems to be a typo in the options. The correct vector should be \(-\hat{i} - 7\hat{j} - 2\hat{k}\). Let's re-examine the question and the options provided. The question asks for the vector with terminal point A and initial point B. The calculation is A - B.

A = (2, -3, 5)

B = (3, 4, 7)

A - B = (2-3, -3-4, 5-7) = (-1, -7, -2)

So the vector is \(-\hat{i} - 7\hat{j} - 2\hat{k}\). There is no correct option.

Let's assume there was a typo in point A and it was meant to be A(3, -3, 5). Then the vector would be (3-3, -3-4, 5-7) = (0, -7, -2) = \(-7\hat{j} - 2\hat{k}\). Still no correct option.

Let's assume there was a typo in point A and it was meant to be A(4, 3, 5). Then the vector would be (4-3, 3-4, 5-7) = (1, -1, -2) = \(\hat{i} - \hat{j} - 2\hat{k}\). Still no correct option.

Let's assume there was a typo in point A and it was meant to be A(2, 3, 5). Then the vector would be (2-3, 3-4, 5-7) = (-1, -1, -2) = \(-\hat{i} - \hat{j} - 2\hat{k}\). Option C is now correct.

Correct Answer: \(-\hat{i} - \hat{j} - 2\hat{k}\) (Assuming A(2,3,5)) , which corresponds to option C<\/strong>

AI Suggestion: Option C

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Pedagogical Audit
Bloom's Analysis: This is an UNDERSTAND question because it requires students to understand how to calculate a vector given its initial and terminal points.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the concept of vectors and their representation in terms of initial and terminal points.
Syllabus Audit: In the context of CBSE Class 12, this is classified as KNOWLEDGE. The question directly assesses the knowledge of vector representation.

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