Practice Questions CBSE - Maths Class 12 (2023 Boards)

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Question 15 - Practice Questions CBSE - Maths Class 12 (2023 Boards) - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at August 14, 2026 by

(PQ) is perpendicular to (QR) . The position vectors of P, Q and R are (4i ̂+7j ̂-k ̂), (5i ̂+yj ̂+k ̂ ) and (-2i ̂+9j ̂+4k ̂ ) respectively.

What is the value of y?

A. -9

B. -8

C. 7

D. 8

 

PQ is Perpendicular to QR. The position vectors of P,Q and R - Practice Questions CBSE - Maths Class 12 (2023 Boards)

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Transcript

(𝑷𝑸) ⃗ is perpendicular to (𝑄𝑅) ⃗. The position vectors of P, Q and R are (4𝑖 ̂+7𝑗 ̂−𝑘 ̂), (5𝑖 ̂+𝑦𝑗 ̂+𝑘 ̂ ) and (−2𝑖 ̂+9𝑗 ̂+4𝑘 ̂ ) respectively. What is the value of y? A. -9 B. -8 C. 7 D. 8

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