# NCERT Class 11-Math's: Chapter –13 Limits and Derivatives Part 13

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**Question 66:**

(A)

(B)

(C)

(D)

**Answer: (B)**

**Question 67:**

Let is

(A)

(B)

(C)

(D)

**Answer: (B)**

**Question 68:**

If then at is

(A) (1)

(B)

(C)

(D)

**Answer: (D)**

**Question 69:**

If then is

(A)

(B)

(C)

(D)

**Answer: (A)**

**Question 70:**

If then is

(A)

(B)

(C)

(D)

**Answer: (A)**

**Question 71:**

If at is

(A)

(B)

(C)

(D) Does not exist

**Answer: (A)**

**Question 72:**

If then at is

(A)

(B)

(C)

(D)

**Answer: (A)**

**Question 73:**

If , then is equal to

(A)

(B)

(C) Done not exist

(D)

**Answer: (B)**

**Question 74:**

If for some constant ‘a’ then is

(A)

(B)

(C) Does not exist

(D)

**Answer: (C)**

**Question 75:**

If , then is equal to

(A)

(B)

(C)

(D)

**Answer: (A)**

**Question 76:**

If , then is equal to

(A)

(B)

(C)

(D)

**Answer: (D)**

## Fill in the Blanks in Exercises 77 to 80

**Question 77:**

If , then _______________

**Answer:**

**Question 78:**

then _______________

**Answer:**

**Question 79:**

If then = ________________

**Answer:**

**Question 80:**

_____________________

**Answer:**