Tag: some functions and their graphs -i

Questions Related to some functions and their graphs -i

If $ P ( X ) = x ^ { 3 } - 3 x ^ { 2 } + 2 x + 5 $ and P ( a ) = P ( b ) = P ( c ) = 0 then the value of ( 2 - a ) ( 2 - b ) ( 2 - c ) is

  1. 3

  2. 5

  3. 7

  4. 9


Correct Option: A

If f : R $\rightarrow$ R, g : R $\rightarrow$ R and h : R $\rightarrow$ R is such that $f(x) = x^2, g(x) = tan  x$ and $h(x) = log  x$, then the value of [ho(gof)], if $x = \displaystyle \dfrac{\pi}{2}$ will be

  1. 0

  2. 1

  3. -1

  4. 10


Correct Option: A
Explanation:

$ho(gof) =(hof)(f(x))$
$=(hog)(x^2)=(hof) (\dfrac{\pi}{4}) = h(g(\dfrac{\pi}{4}))$
$= h(tan \dfrac{ \pi}{4}) = h(1) = log 1 =0$

If f is a constant function and f(100)=100  then f(2007)=_____

  1. 2007

  2. 100

  3. 0

  4. None of these


Correct Option: B
Explanation:

A constant function $ f(x) $ will have the result as a constant for any value of $ x $

So, if $ f(100) = 100 $
then $ f(2007 ) $ is also $ 100 $

The number of elements of an identity function defined on a set containing four elements is______

  1. $\displaystyle 2^{2}$

  2. $\displaystyle 2^{4}$

  3. $\displaystyle 2^{8}$

  4. $\displaystyle 2^{16}$


Correct Option: A
Explanation:

If an element is related to itself, it is called an identity function. That is $ f(x) = x $

So, if  the set has $ 4 $ elements, then the function will also have $ 4 = 2^2 $ elements.

On differentiating an identity function, we get?

  1. Signum function

  2. Sinc function

  3. Constant function

  4. None


Correct Option: C
Explanation:

Derivative of an Identity function gives a Constant function



$\dfrac{d(cx)}{dx} = c$ 
Where $c$ is a constant.

If $f,g,h$ are three functions from a set of positive real numbers into itself satisfying the condition,
$f(x) \cdot g(x)=h \sqrt{x^2 + y^2}$ such that $x,y \epsilon (0,\infty)$.then, $\dfrac{f(x)}{g(x)}$ is a?

  1. Constant function

  2. Identity function

  3. Zero function

  4. Signum function


Correct Option: A

A constant function is a periodic function.

  1. True

  2. False


Correct Option: A
Explanation:

$f(x)=f(x+a)$
A constant function is a period with any value of $'a'$ as a period

Let $f(-2, 2)\rightarrow(-2, 2)$ be a continuous function given $f(x)=f{(x}^{2})$. Given $f(0)=\dfrac{1}{2}$ then the $4f(\dfrac{1}{2})$

  1. $4$

  2. $2$

  3. $-2$

  4. $1$


Correct Option: A

If $f\left( x \right)$ is a function satisfying  $f\left( x \right).f\left( {\frac{1}{x}} \right) = f\left( x \right) + f\left( {\frac{1}{x}} \right)$ and $f\left( 4 \right) = 65$ then find $f\left( 6 \right)$

  1. $217$

  2. $215$

  3. $-216$

  4. $-217$


Correct Option: D

Let $f\left( x \right) = p{x^2} + qx - \left( {{a^2} + {b^2} + {c^2} - ab - bc - ca} \right),\,\left( {p,q,a,b,c \in R} \right)(a,b,c$ are distinct). If both roots of $f(x)=0$ are non-real, then 

  1. $2\left( {p + q} \right) - \left[ {{{\left( {a - b} \right)}^2} + {{\left( {b - c} \right)}^2} + {{\left( {c - a} \right)}^2}} \right] > 0$

  2. $2\left( {p + q} \right) - \left[ {{{\left( {a - b} \right)}^2} + {{\left( {b - c} \right)}^2} + {{\left( {c - a} \right)}^2}} \right] < 0$

  3. $p - 2q - 2 - \left[ {{{\left( {a - b} \right)}^2} + {{\left( {b - c} \right)}^2} + {{\left( {c - a} \right)}^2}} \right] < 0$

  4. $p - 2q - 2 - \left[ {{{\left( {a - b} \right)}^2} + {{\left( {b - c} \right)}^2} + {{\left( {c - a} \right)}^2}} \right] > 0$


Correct Option: C