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PRACTICE QUESTION BANK

ফুড ইঞ্জিনিয়ারিং

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51. MCQPractice set · Question 51

-1 এর argument কত?

a.
b.
90°
c.
180°
d.
-90°

Correct answer: c

-1 = -1 + 0i, অর্থাৎ বিন্দু (-1, 0)। negative real axis-এর সাথে কোণ 180°।

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52. MCQPractice set · Question 52

√3 + i এর argument কত?

a.
60°
b.
45°
c.
30°
d.
90°

Correct answer: c

tan θ = 1/√3 = tan 30°, এবং z প্রথম চতুর্ভাগে, তাই θ = 30°। modulus = 2।

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53. MCQPractice set · Question 53

principal argument-এর range কোনটি?

a.
(-π, π]
b.
[0, 2π)
c.
(-π/2, π/2)
d.
সব real number

Correct answer: a

principal argument সর্বদা (-π, π] interval-এ নেওয়া হয়; 0 বাদে অন্য কোনো মান দুইবার আসে না।

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54. MCQPractice set · Question 54

z = -1 - i এর polar form কোনটি?

a.
√2(cos 45° + i sin 45°)
b.
√2(cos 225° + i sin 225°)
c.
2(cos 225° + i sin 225°)
d.
√2(cos 135° + i sin 135°)

Correct answer: b

|-1 - i| = √2 এবং argument 225° (তৃতীয় চতুর্ভাগ), তাই polar form √2(cos 225° + i sin 225°)।

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55. MCQPractice set · Question 55

z = 1 + i√3 এর polar form কোনটি?

a.
2(cos 60° + i sin 60°)
b.
2(cos 30° + i sin 30°)
c.
√2(cos 60° + i sin 60°)
d.
4(cos 60° + i sin 60°)

Correct answer: a

|1 + i√3| = 2 এবং tan θ = √3 → θ = 60°, তাই polar form 2(cos 60° + i sin 60°)।

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56. MCQPractice set · Question 56

polar form z = r(cos θ + i sin θ) এ r কী?

a.
Re(z)
b.
Im(z)
c.
|z|
d.
arg z

Correct answer: c

r হলো modulus অর্থাৎ |z|, আর θ হলো argument।

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57. MCQPractice set · Question 57

z = a + bi, |z| = r হলে cos θ = কত?

a.
b / r
b.
a / r
c.
r / a
d.
a / b

Correct answer: b

polar form-এ a = r cos θ এবং b = r sin θ, তাই cos θ = a/r।

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58. MCQPractice set · Question 58

arg(z₁z₂) কত?

a.
arg z₁ + arg z₂
b.
arg z₁ - arg z₂
c.
arg z₁ × arg z₂
d.
|arg z₁ - arg z₂|

Correct answer: a

গুণ করলে argument যোগ হয়: arg(z₁z₂) = arg z₁ + arg z₂ (2π-এর গুণিতক পর্যন্ত)।

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59. MCQPractice set · Question 59

arg(z₁/z₂) (z₂ ≠ 0) কত?

a.
arg z₁ + arg z₂
b.
arg z₁ - arg z₂
c.
arg z₂ - arg z₁
d.
|arg z₁ - arg z₂|

Correct answer: b

ভাগ করলে argument বিয়োগ হয়: arg(z₁/z₂) = arg z₁ - arg z₂।

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60. MCQPractice set · Question 60

arg(z̄) কত?

a.
-arg z
b.
arg z
c.
π + arg z
d.
π - arg z

Correct answer: a

conjugate নিলে z real axis-এর সাপেক্ষে প্রতিফলিত হয়, তাই arg(z̄) = -arg z।

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