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TRB MODEL QUESTIONS FOR MATHS

TRB Model Questions
21. Which one of the following is not a prime number?
 
  • A. 3
  • B. 9
  • C. 11
  • D. 17
 
22. The conic is called a parabola if
 
  • A. e = 1
  • B. e > 1
  • C. e < 1
  • D. none of these
 
 
23. Binomail Expansion of (1 - x)-2 is
 
  • A. 1 - 2x + 3x2 - 4x3 + ....
  • B. 1 + 2x + 3x2 + 4x3 + ....
  • C. 1 + x + x2 + ....
  • D. 1 - x + x2 - x3 + ....
 
24. Which one of the following is a composite number?
 
  • A. 2
  • B. 5
  • C. 7
  • D. 12
 
25. The equation of directrix of the parabola y2 = 4ax is
 
  • A. x = a
  • B. y = 0
  • C. x = -a
  • D. x = 0