NEET Physics Mathematical Tools Questions Solved


Which of the following is perpendicular to i^-j^-k^ ?

(A)  i^+j^+k^

(B)  -i^+j^+k^

(C)  i^+j^-k^

(D)  None of these

Concept Videos :-

#25 | Vectors: Multiplication with Scalar
#26 | Vectors: Multiplication with Vector : Dot Product

Concept Questions :-

Scalar Product

If vector A  is to B, B .A =0 Checking all optionsa) (i^ - j^ -k^). (i^ + j^ +k^) = 1-1-1 =-1   (Not perpendicular)b) (i^ - j^ -k^). (-i^ + j^ +k^) = -1-1-1 =-3   (Not perpendicular)c) (i^ - j^ -k^). (i^ + j^ -k^) = -1-1+1 =1   (Not perpendicular)So , no option matches. Answer is option D

Difficulty Level:

  • 16%
  • 26%
  • 13%
  • 47%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 21, 2019)