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PRACTICE QUESTION BANK

ইন্ডাস্ট্রিয়াল এন্ড প্রোডাকশন ইঞ্জিনিয়ারিং

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রসায়ন

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গণিত

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Questions

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31. MCQPractice set · Question 31

|z̄| (conjugate-এর modulus) কত?

a.
|z|
b.
-|z|
c.
|z|²
d.
1 / |z|

Correct answer: a

a + bi এবং a - bi উভয়ের modulus √(a² + b²), তাই |z̄| = |z|।

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32. MCQPractice set · Question 32

|z| = 0 হলে নিচের কোনটি সঠিক?

a.
z = i
b.
z = 1
c.
z = 0
d.
z নির্ধারণ করা যায় না

Correct answer: c

|z| = 0 মানে √(a² + b²) = 0, অর্থাৎ a = 0 ও b = 0। তাই z = 0।

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33. MCQPractice set · Question 33

|z|² কত?

a.
z + z̄
b.
z z̄
c.
z - z̄
d.

Correct answer: b

z z̄ = (a + bi)(a - bi) = a² + b² = |z|²।

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34. MCQPractice set · Question 34

|2 - 3i| এর মান কত?

a.
√13
b.
13
c.
√5
d.
5

Correct answer: a

|2 - 3i| = √(2² + (-3)²) = √13।

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35. MCQPractice set · Question 35

|(3 + 4i)(-2 + i)| এর মান কত?

a.
5
b.
5√5
c.
25
d.
√5

Correct answer: b

|3 + 4i| = 5 এবং |-2 + i| = √5। গুণফলের modulus = 5√5।

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36. MCQPractice set · Question 36

|(1 + i)⁴| এর মান কত?

a.
4
b.
2
c.
8
d.
16

Correct answer: a

|zⁿ| = |z|ⁿ, তাই |(1 + i)⁴| = (√2)⁴ = 4।

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37. MCQPractice set · Question 37

|1/(2 + i)| এর মান কত?

a.
1/5
b.
1/√5
c.
√5
d.
5

Correct answer: b

|1/z| = 1/|z|, তাই মান 1/√5।

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38. MCQPractice set · Question 38

z = (1 + i)/(1 - i) হলে |z| কত?

a.
√2
b.
1
c.
2
d.
1/√2

Correct answer: b

(1 + i)/(1 - i) = i, আর |i| = 1।

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39. MCQPractice set · Question 39

|z| = 1 হলে 1/z কত?

a.
z
b.
c.
d.
-z

Correct answer: b

1/z = z̄/|z|² = z̄/1 = z̄। তাই unit modulus হলে inverse = conjugate।

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40. MCQPractice set · Question 40

|√3 + i| এর মান কত?

a.
2
b.
√3
c.
4
d.
√2

Correct answer: a

|√3 + i| = √(3 + 1) = 2।

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