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If the direction ratios of two lines are...

If the direction ratios of two lines are 2, -3, 6 and 1, -2, 2 respectively then the angle between the lines is -

A

`(pi)/(2)`

B

`"cos"^(-1)(20)/(21)`

C

`"cos"^(-1)(3)/(5)`

D

`"cos"^(-1)(8)/(21)`

Text Solution

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The correct Answer is:
B
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 2
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  2. The distance between the point (-1, -5, -10) and the point of interse...

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  3. If the direction ratios of two lines are 2, -3, 6 and 1, -2, 2 respect...

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  4. A coin and a six faced die, both unbiased, are thrown simultaneously....

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  5. A number is chosen at random among the first 120 natural numbers. What...

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  6. If A=((-1,0),(0,2)) then the value of A^(3)-A^(2) is equal to -

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  7. If 1, omega,omega^(2) are the cube roots of unity then the vlue of m f...

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  8. If A=[(-x,-y),(z,t)], then the transpose of adj A is -

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  9. A die is thrown if it shows a six, we draw ball from is bag containing...

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  10. The solutions of the equation |(x,2,-1),(2,5,x),(-1,2,x)|=0 are -

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  11. The vector of magnitude 12, which is perpendicular to both the vect...

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  12. If A is a square matrix of order 3xx3 and lambda is a scalar, then adj...

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  13. If veca, vecb,vec c are unit vectors such that veca+vecb+vec c=veco, t...

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  14. The points with position vectors 60hati+3hatj, 40hati-8hatj and a hat...

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  15. If the diagonals of a parallelogram are 3hati+hatj-2hatk and hati-3hat...

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  16. Let PQRS be a parallelogram whose diagonals PR and QS intersect at O'....

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  17. If f(x)=(2x+1)/(3x-2), then (fof)(2) is equal to -

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  18. The relation R is defined on the set of natural numbers N as x is a f...

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  19. The value of sin((1)/(2)"cos"^(-1)(4)/(5)) is -

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  20. Let C and R be the sets of complex numbers and real numbers respectiv...

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