JEE, NEET, Foundation & CBSE

The point (k, 2-k), (-k+1, 2k), (-4-k, 6-2k) are collinear then k=
  1. 2,3
  2. 1,0
  3. 1/2,-1
  4. 1,2
If z1 ans z2 are two complex numbers satisfying the equation |(z1+z2)/(z1-z2)| = 1 then z1/z2 is a number which is
  1. . positive real
  2. neagative real
  3. zero
  4. none
A class consists of a number of boys whose ages are in AP, the common difference being 4 months. If the youngest boy is just 8 years old, and if sum of the ages is 168years, find the number of boys in the class.
  1. 14
  2. 16
  3. 18
  4. 20
The mean of following numbers 1,2,3,4,5 ......, 51 is .......
  1. 25
  2. 26
  3. 27
  4. 28
A 91 / 4 in. long piece of metal rod is cut from a large rod that is 1115 / 16 in. long. Find the length of the piece that is left from the large rod.
  1. 83 / 4
  2. 211 / 16 in
  3. 112 / 16 in.
  4. 2011 / 16
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