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সিভিল ইঞ্জিনিয়ারিং

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1961. MCQPractice set · Question 20

Parabola-এর eccentricity কত?

a.
0
b.
1
c.
less than 1
d.
2

Correct answer: b

Parabola-এর eccentricity e=1।

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1962. MCQPractice set · Question 21

Ellipse-এর eccentricity-এর range কী?

a.
0≤e<1
b.
e=1 only
c.
e>1
d.
e<0

Correct answer: a

Circle-এর জন্য e=0 এবং non-circular ellipse-এর জন্য 0<e<1।

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1963. MCQPractice set · Question 22

Planet-এর closest point to Sun কী নামে পরিচিত?

a.
perihelion
b.
aphelion
c.
equator
d.
zenith

Correct answer: a

Perihelion হলো orbit-এর Sun-nearest point।

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1964. MCQPractice set · Question 23

Planet-এর farthest point from Sun কী নামে পরিচিত?

a.
aphelion
b.
perihelion
c.
perigee
d.
pole

Correct answer: a

Aphelion হলো Sun থেকে সবচেয়ে দূরের point।

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1965. MCQPractice set · Question 24

Earth-এর closest point Sun-এর কাছে কী?

a.
perihelion
b.
aphelion
c.
zenith
d.
nadir

Correct answer: a

Sun-কে কেন্দ্র ধরে Earth-এর nearest orbital point perihelion।

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1966. MCQPractice set · Question 25

Kepler second law কোন conservation law-এর সঙ্গে যুক্ত?

a.
angular momentum conservation
b.
charge conservation
c.
mass conservation only
d.
heat conservation

Correct answer: a

Equal area law constant areal velocity এবং angular momentum conservation প্রকাশ করে।

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1967. MCQPractice set · Question 26

Areal velocity কী?

a.
area swept per unit time
b.
distance per unit time
c.
angle per unit time
d.
volume per time

Correct answer: a

dA/dt হলো areal velocity; Kepler second law-এ এটি constant।

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1968. MCQPractice set · Question 27

Kepler second law অনুযায়ী dA/dt কেমন?

a.
constant
b.
zero সবসময়
c.
radius-এর proportional
d.
speed-এর inverse সবসময়

Correct answer: a

Radius vector equal time-এ equal area sweep করে, তাই dA/dt constant।

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1969. MCQPractice set · Question 28

Planet perihelion-এ angular velocity কী?

a.
বেশি
b.
কম
c.
zero
d.
same as aphelion সবসময়

Correct answer: a

আরিয়া rate constant এবং r কম, তাই angular speed বেশি।

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1970. MCQPractice set · Question 29

Planet perihelion-এ linear speed কী?

a.
বেশি
b.
কম
c.
zero
d.
অপরিবর্তিত সবসময়

Correct answer: a

Sun-এর কাছে gravitational potential কমে kinetic speed বাড়ে।

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