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টেক্সটাইল ইঞ্জিনিয়ারিং

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1981. MCQPractice set · Question 40

Kepler third law-এ r-এর বদলে কী ব্যবহার করা উচিত elliptical orbit-এ?

a.
semi-major axis a
b.
minor axis only
c.
perihelion distance only
d.
diameter always

Correct answer: a

Elliptical orbit-এর period T²∝a³, যেখানে a semi-major axis।

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1982. MCQPractice set · Question 41

দুই planet-এর semi-major axes ratio 1:4 হলে period ratio কী?

a.
1:8
b.
1:4
c.
1:2
d.
4:1

Correct answer: a

T∝a^{3/2}; 4^{3/2}=8, তাই 1:8।

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1983. MCQPractice set · Question 42

দুই planet-এর periods ratio 1:8 হলে semi-major axes ratio কী?

a.
1:4
b.
1:8
c.
1:16
d.
4:1

Correct answer: a

a∝T^{2/3}; 8^{2/3}=4।

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1984. MCQPractice set · Question 43

দুই planet একই orbit radius-এ একই central mass ঘিরে চললে periods কেমন?

a.
সমান
b.
mass-এর proportional
c.
একটির দ্বিগুণ
d.
zero

Correct answer: a

Period formula-তে orbit radius ও central mass আছে; planet mass negligible।

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1985. MCQPractice set · Question 44

Kepler first law-এর orbit shape কী?

a.
ellipse
b.
circle only
c.
parabola always
d.
straight line

Correct answer: a

Ellipse হলো general bound planetary orbit; circle special ellipse।

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1986. MCQPractice set · Question 45

Sun elliptical orbit-এর centre-এ থাকে?

a.
না, focus-এ থাকে
b.
হ্যাঁ সবসময়
c.
minor axis-এর শেষে
d.
দুই জায়গায়

Correct answer: a

Kepler first law-এ Sun focus-এ, centre-এ নয় যদি orbit elliptical হয়।

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1987. MCQPractice set · Question 46

Ellipse-এর দুই focus coincident হলে orbit কী?

a.
circle
b.
parabola
c.
hyperbola
d.
line

Correct answer: a

e=0 হলে ellipse circle-এ পরিণত হয়।

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1988. MCQPractice set · Question 47

Planet-এর areal velocity-এর SI dimension কী?

a.
L²T⁻¹
b.
LT⁻¹
c.
T⁻¹
d.
L³T⁻¹

Correct answer: a

Area/time-এর dimension [L²T⁻¹]।

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1989. MCQPractice set · Question 48

Kepler second law কোন point-এর জন্য radius vector ব্যবহার করে?

a.
Sun বা central focus
b.
ellipse centre only
c.
planet-এর surface
d.
Earth centre সবসময়

Correct answer: a

Planet ও Sun-কে যুক্ত line equal area sweep করে।

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1990. MCQPractice set · Question 49

Equal area law-এর ফলে কোন quantity ধ্রুব?

a.
areal velocity
b.
linear speed
c.
radius
d.
angular displacement per orbit

Correct answer: a

dA/dt constant।

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