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If (z-1)/(z+1) is purely imaginary, then...

If `(z-1)/(z+1)` is purely imaginary, then

A

`|z|=(1)/(2)`

B

`|z|=1`

C

`|z|=2`

D

`|z|=3`

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2012-MULTIPLE CHOICE QUESTIONS
  1. The maximum value of |z| when the complex number z satisfied the condi...

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  2. If ((3)/(2)+ (sqrt(3))/(2))^(50)=3^(25)(x+iy) where x and y are real, ...

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  3. If (z-1)/(z+1) is purely imaginary, then

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  4. Three are 100 students in a class. In an examination, 50 of them faile...

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  5. A vechicle registration number consists of 2 letters of English alphab...

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  6. The number of words that can be written using all the letters of the ...

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  7. Four speakers will address a meeting where speaker Q will always speak...

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  8. The number of diagonals in a regular polygon of 100 sides is

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  9. Let the coefficients of powers of x in the 2^(nd) and , 3^(rd), and 4^...

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  10. Let f(x)+ax^(2)+bx+c , g x= px^(2)+qx+r, such that f(1)=g(1), f(2), g(...

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  11. The sum 1xx1!xx2!+...+50xx50! equals

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  12. Six numbers are in A.P in A.P such that their sum is 3. the first term...

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  13. The sum of the infinite series 1+(1)/(3)+(1.3)/(3.6)+(1.3.5)/(3.6.9)+(...

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  14. The equation x^(2)+x+a=0 and x^(2)+ax+1=0 have a common real root

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  15. If 64,27, 36 are the p^(th) , Q^(th) and R^(th) terms of a G.P. then P...

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  16. If sin^(-1)x+sin^(-1)y+sin^(-1)z=(3pi)/(2), then the value of x^(9)+y^...

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  17. Let p,q,r be the sides opposite to the angles P,Q, R respectively in a...

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  18. Let p,q,r be the sides opposite to the angles P,Q, R respectively in a...

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  19. Let P (2,-3), Q(-2, 1) be the vertices of the triangle PQR. If the cen...

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  20. lim(x to 0) (pi^(x)-1)/(sqrt(1+x)-1)

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