# NCERT Class 11-Math's: Chapter –5 Complex Numbers and Quadratic Equations Part 15

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**Question 47:**

is possible if

(A)

(B)

(C)

(D)

**Answer: (C)**

**Question 48:**

The real value of for which the expression is a real number is:

(A)

(B)

(C)

(D)None of these

**Answer: (C)**

**Question 49:**

The value of when is:

(A)

(B)

(C)

(D) none of these

**Answer: (C)**

**Question 50:**

If , where then is

(A)

(B)

(C)

(D) None of these

**Answer: (A)**