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The plane lx + my = 0 is rotated about i...

The plane `lx + my = 0` is rotated about its line of intersection with the plane z= 0 through an angle `alpha`. The equation changes to

A

`lx+my pm tan alpha sqrt(l^(2)+m^(2))=0`

B

`lx+my pm z tan alpha sqrt(l^(2)+m^(2)+1)=0`

C

`lx+my pm z tan alpha sqrt(l^(2)+1)=0`

D

`lx +my pm z tan alpha sqrt(l^(2)+m^(2))=0`

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2021-MULTIPLE CHOICE QUESTION
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  6. The determinant |(a^(2)+10,ab, ac),(ab, b^(2)+10, bc),(ac, bc, c^(2)...

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  7. Let R be the real line. Let the relations S and T on R be defined by ...

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  8. The plane lx + my = 0 is rotated about its line of intersection with t...

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  9. The points of intersection of two ellipses x^(2)+2y^(2) -6x-12y+20=0 a...

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  10. Let I= int(pi//4)^(pi//3) (sinx)/(x)dx. Then

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  11. If |z+i|-|z-1|=|z|-2=0 for a complex number z, then z =

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  12. |(x, 3x+2,2x-1),(2x-1,4x,3x+1),(7x-2,17x+6,12x-1)|=0 is true for

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  13. The remainder when 7^(7^(7^(...^(7))))(22 times 7) is divided by 48 is

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  15. A plane meets the co-ordinate axes at the points A, B, C respectively ...

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  17. underset(nrarrinfty)lim (sqrt1+sqrt2+.......+sqrt(n-1))/(nsqrtn) = ?

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  18. Let f(x)={(0", if"-1 le x lt 0),(1", if "x =0),(2", if "0 lt x le1):} ...

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  19. The greatest and least values of f(x)=tan^(-1)x -(1)/(2) ln x on [(1)...

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