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Test: Meaning of Derivatives - JEE MCQ


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10 Questions MCQ Test Chapter-wise Tests for JEE Main & Advanced - Test: Meaning of Derivatives

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Test: Meaning of Derivatives - Question 1

  

Detailed Solution for Test: Meaning of Derivatives - Question 1

d/dx(1/x2 ) = -2 (x -2-1) = -2* (x-3) = -2/x3

Test: Meaning of Derivatives - Question 2

The derivative of f(x) = 99x at x = 100 is:​

Detailed Solution for Test: Meaning of Derivatives - Question 2

f'(100) = lim(h→0) [f(100+h) - f(100)]/h
= lim(h→0) [99(100+h) - 99(100)]/h
= lim(h→0) [9900 + 99h - 9900]/h
= lim(h→0) 99h/h
= lim(h→0) 99
= 99

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Test: Meaning of Derivatives - Question 3

Find the derivative of 

Detailed Solution for Test: Meaning of Derivatives - Question 3

We’ll first need to divide the function out and simplify before we take the derivative. Here is the rewritten function.

The derivative is, 

Test: Meaning of Derivatives - Question 4

Derivative of sum of two functions is _____ of the derivatives of the functions.​

Detailed Solution for Test: Meaning of Derivatives - Question 4

In calculus, the sum rule in differentiation is a method of finding the derivative of a function that is the sum of two other functions for which derivatives exist. This is a part of the linearity of differentiation.

Test: Meaning of Derivatives - Question 5

The derivative of the constant function f(x) = a for a fixed real number ‘a’ is:​

Detailed Solution for Test: Meaning of Derivatives - Question 5

Let f(x) = a, where a is a fixed real number.
So, f(x+h) = a
So, d/dx(f(x)) = lim(h→0)f[(x+h)−f(x)]/h
= lim(h→0) (a−a)/h
= 0
Hence, d/dx(a) = 0 , where a is a fixed real number.

Test: Meaning of Derivatives - Question 6

Derivative of sum of two functions is sum of the derivatives of the functions. If , f and g be two functions such that their derivatives are defined in ______.​

Detailed Solution for Test: Meaning of Derivatives - Question 6
  • The process of determining the derivative of a function is known as differentiation. It is clearly visible that the basic concept of derivative of a function is closely intertwined with limits. Therefore, it can be expected that the rules of derivatives are similar to that of limits.
  • The following rules are a part of algebra of derivatives:
    Consider f and g to be two real-valued functions such that the differentiation of these functions is defined in a common domain.
Test: Meaning of Derivatives - Question 7

The derivative of f(x) = 1/x3

Detailed Solution for Test: Meaning of Derivatives - Question 7

Test: Meaning of Derivatives - Question 8

Derivative of quotient of two functions f(x) and g(x); g(x) ≠ 0 is given by  is given by 

Detailed Solution for Test: Meaning of Derivatives - Question 8

This is a formula of question.

 

Test: Meaning of Derivatives - Question 9

If f is a real valued function and c is a point in its domain, then  is ;

Detailed Solution for Test: Meaning of Derivatives - Question 9

This is a formula for finding derivative or differentiation which is represented by
but here at the place of x , c is written So this is equal to f'(c)

Test: Meaning of Derivatives - Question 10

The derivative at x = 2/3 of the function f(x) = 3x is:​

Detailed Solution for Test: Meaning of Derivatives - Question 10

f(x) = 3x
f’(x) = lim(h→0) [f(x+h) - f(x)]/h
= f(x+h) = 3(x+h)
f’(x) = = lim(h→0) [3(x+h) - 3(x)]/h
Putting x = ⅔
f’(⅔) = lim(h→0) [3(⅔+h) - 3(⅔)]/h
= lim(h→0) [(6+3h)-6]/h
=lim(h→0) 3h/h
lim(h→0) 3
The derivative of the function f’(⅔) = 3

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