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সিভিল ইঞ্জিনিয়ারিং

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2021. MCQPractice set · Question 80

একটি planet-এর semi-major axis 9 গুণ হলে period কত গুণ?

a.
3
b.
9
c.
27
d.
81

Correct answer: c

T∝a^{3/2}; 9^{3/2}=27।

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2022. MCQPractice set · Question 81

একটি planet-এর period 27 গুণ হলে semi-major axis কত গুণ?

a.
3
b.
9
c.
27
d.
81

Correct answer: b

a∝T^{2/3}; 27^{2/3}=9।

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2023. MCQPractice set · Question 82

একই central star-এ planet A-এর period planet B-এর 8 গুণ হলে a_A/a_B কত?

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

Correct answer: b

a ratio=T^{2/3}=8^{2/3}=4।

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2024. MCQPractice set · Question 83

Planet A-এর orbital radius planet B-এর 1/4 হলে period ratio T_A/T_B কত?

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

Correct answer: a

T ratio=(1/4)^{3/2}=1/8।

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2025. MCQPractice set · Question 84

একটি planet perihelion-এ angular momentum-এর magnitude কী?

a.
aphelion-এর সমান
b.
দ্বিগুণ
c.
অর্ধেক
d.
zero

Correct answer: a

Central force-এর torque zero, তাই angular momentum conserved।

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2026. MCQPractice set · Question 85

Perihelion ও aphelion-এ r v_t-এর relation কী?

a.
সমান
b.
perihelion-এ দ্বিগুণ
c.
aphelion-এ দ্বিগুণ
d.
zero

Correct answer: a

Specific angular momentum h=r v_t constant।

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2027. MCQPractice set · Question 86

Perihelion distance r_p এবং speed v_p; aphelion-এ speed v_a হলে কী?

a.
r_pv_p=r_av_a
b.
r_p/v_p=r_a/v_a
c.
r_p+v_p=r_a+v_a
d.
v_p=v_a always

Correct answer: a

Angular momentum conservation থেকে r_pv_p=r_av_a।

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2028. MCQPractice set · Question 87

যদি r_a=2r_p হয়, তবে v_p/v_a কত?

a.
1/2
b.
1
c.
2
d.
4

Correct answer: c

r_pv_p=r_av_a=2r_pv_a, তাই v_p=2v_a।

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2029. MCQPractice set · Question 88

Planet-এর speed maximum কোথায়?

a.
perihelion
b.
aphelion
c.
ellipse centre
d.
দুটিতে সমান

Correct answer: a

Angular momentum ও energy উভয় বিবেচনায় nearest point-এ speed maximum।

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2030. MCQPractice set · Question 89

Planet-এর speed minimum কোথায়?

a.
aphelion
b.
perihelion
c.
focus
d.
সব জায়গায় সমান

Correct answer: a

Sun থেকে দূরের aphelion-এ speed minimum।

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