JEE, NEET, Foundation & CBSE

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
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
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
The mean of following numbers 1,2,3,4,5 ......, 51 is .......
  1. 25
  2. 26
  3. 27
  4. 28
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
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