ISRO Mechanical & Aerospace 2012 - Question 26

All ISRO Mechanical & Aerospace papers | ISRO Mechanical & Aerospace 2012

The value of t for which A + tB is perpendicular to C where A = i + 2j + 3k, B = -i + 2j + k and C = 3i + j

  • A. 5
  • B. 4
  • C. 12
  • D. 0

Answer: A. 5

Explanation: Dot product of (A+tB) and C is zero. Solving gives t=5.

| | All questions of ISRO Mechanical & Aerospace 2012