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Mathematics

One-one function

In this Class 12 Mathematics topic from Relations and Functions, students learn that a one-one (injective) function maps different elements of its domain to different elements of its codomain. They practise checking this property through ordered pairs, mappings, tables, graphs, and algebraic expressions, while distinguishing one-one functions from many-one functions. The topic also builds understanding of composition and explains why a one-one function is important when studying inverse functions, with clear connections among domain, range, and codomain.

Hard · Level 6 · 25 questions

TOPIC PRACTICE

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25 questions

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  1. (f) is not one-one
  2. (f) is one-one
  3. (f) is defined only at (x=2)
  4. The range of (f) is empty
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  1. Because (f(x)=0) for every (x<0)
  2. Because (f(x)=0) for every (x>0)
  3. Because (f(0)) is not defined
  4. Because it is always negative
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  1. (f) is one-one
  2. (f) is not one-one because it is periodic
  3. (f) is constant
  4. (f) is defined only on integers
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f) is constant
  4. The range of (f) is only ({0})
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  1. One-one
  2. Not one-one
  3. Constant
  4. Undefined
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  1. (f) is not one-one
  2. (f) is one-one
  3. (f) is decreasing everywhere
  4. The value of (f) is never (1)
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f) is constant everywhere
  4. (f) gives negative values
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f) is not a function
  4. (f) is zero everywhere
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  1. (f) is not one-one
  2. (f) is one-one
  3. (f) is not defined
  4. The range of (f) is empty
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f) is not a function
  4. (f) has no image
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  1. (f) is not one-one
  2. (f) is one-one
  3. (f) is not a function
  4. The domain of (f) is empty
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  1. One-one
  2. Not one-one
  3. Constant
  4. Undefined
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  1. (f) is not one-one
  2. (f) is one-one
  3. (f) is defined only at (x=7)
  4. (f) has no value
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  1. (f(1)=f(3))
  2. (f(0)=f(1))
  3. (f(2)=f(4))
  4. (f(-1)=f(1))
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  1. When (k\neq2)
  2. When (k=2)
  3. Only when (k=0)
  4. Never
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f(1)=f(2))
  4. (f) is constant
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  1. Because (f(2)=f(-2))
  2. Because (f(2)\neq f(-2))
  3. Because (f(0)) is not defined
  4. Because it is constant
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f) gives the same value for every (n)
  4. (f) gives only even values
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  1. No
  2. Yes
  3. Only at \(x=0\)
  4. Function not defined
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  1. (f(0)=f(-3))
  2. (f(1)=f(2))
  3. (f(-1)=f(1))
  4. (f(2)=f(3))
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f(1)=f(3)) so repetition is in the domain
  4. (f) is constant
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  1. Every horizontal line cuts the graph at at most one point
  2. Every vertical line cuts the graph at two points
  3. Every horizontal line cuts the graph at at least two points
  4. The graph must be a parabola
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  1. (f(p)=2,\ f(q)=3,\ f(r)=2)
  2. (f(p)=2,\ f(q)=3,\ f(r)=4)
  3. (f(p)=5,\ f(q)=6,\ f(r)=7)
  4. (f(p)=1,\ f(q)=8,\ f(r)=9)
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  1. (f) is one-one
  2. (f) is not one-one
  3. (f) is constant
  4. (f) is defined only at (x=5)
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  1. (k\ge0)
  2. (k<0)
  3. (k=-3)
  4. (k) may be any real number

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