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If |bar(x)+bar(y)|=|bar(x)-bar(y)|, then...

If `|bar(x)+bar(y)|=|bar(x)-bar(y)|`, then

A

`bar(x)` is parallel to `bar(y)`

B

`bar(x)_|_bar(y)`

C

`|bar(x)|=|bar(y)|`

D

`bar(x)=bar(y)`

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The correct Answer is:
B
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KUMAR PRAKASHAN-VECTOR ALGEBRA -Solutions of NCERT Exemplar Problems (Multiple Choice Questions (MCQs) )
  1. A(3,-1),B(2,3) and C(5,1) are given then m angleA = ………

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  2. bar(x) and bar(y) are unit vectors and (bar(x)""(,)^(hat)bar(y))=theta...

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  3. If |bar(x)+bar(y)|=|bar(x)-bar(y)|, then

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  4. bar(x),bar(y),bar(z) are zero vectors. If …………… then bar(x).bar(y)=bar...

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  5. bar(x),bar(y),bar(z) are non zero vectors. If (bar(x)""(,)^(hat)bar(y)...

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  6. If bar(x).bar(y)=bar(x).bar(z) ne 0 and bar(x)xx bar(y)=bar(x)xx bar(z...

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  7. If bar(a)=(3,1,-2) and bar(b)=(1,3,-2) then (bar(a)" "^(hat)bar(b)) = ...

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  8. If bar(x)=(1,1,-1),bar(y)=(-1,2,2) and bar(z)=(-1,2,-1) then the unit ...

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  9. If (3hati+4hatj+9hatk) and (a hati-3hatj+1hatk) are perpendicualr to e...

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  10. If |bar(a)|=2,|bar(b)|=4,|bar( c )|=1 and bar(a)+bar(b)=-bar( c ) then...

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  11. If |bar(x)|=|bar(y)|=2 and (bar(x)" "^(hat)bar(y))=theta then |bar(x)-...

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  12. The projection of the vector (-4,-2,4) on (2,1,1) is ………….

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  13. The magnitude of the projection of vector (4, 1, 3) and (1, -2, 3) is ...

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  14. The unit vector perpendicular to (3,-4) in R^(2) is ………………

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  15. The unit vector perpendicualr to (3, 4)is ……………….

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  16. If |bar(x)|=|bar(y)|=1 and bar(x)|bar(y), then |bar(x)-bar(y)| =……………

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  17. bar(a)=(-3,1,0),bar(b)=(1,-1,-1) then |"Comp"(bar(b))bar(a)| = …………

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  18. If bar(a)+bar(b)+bar( c )=bar(0) and |bar(a)|=3,|bar(b)|=5,|bar( c )|=...

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  19. A(1, -2, 4), B(5, -1, 7), C(3, 6, -2) and D(4, 5, -1) are given vector...

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  20. In a right angled triangle ABC, hypotenuse AB=P then bar(AB).bar(AC)+b...

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