Kepler’s Law of Planetary Motion NEET Online Quiz Question and Objective Questions Answers

7.

Which of the following correctly describes the eccentricity of an ellipse?

A.

e = 0 for a circle, 0 < e < 1 for an ellipse, e = 1 for a parabola

B.

e = 1 for a circle, 0 < e < 1 for an ellipse

C.

e > 1 for all ellipses

D.

e = 0 for all planetary orbits (they are perfect circles)

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8.

Kepler's Second Law (Law of Areas) states that:

A.

A planet moves faster when farther from the Sun and slower when nearer

B.

The line joining a planet to the Sun sweeps equal areas in equal intervals of time

C.

The orbital speed of a planet is proportional to its distance from the Sun

D.

The area swept is proportional to the square of the time interval

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9.

The Law of Areas (Kepler's Second Law) is a consequence of:

A.

Newton's third law of motion

B.

Conservation of kinetic energy

C.

Conservation of angular momentum for any central force

D.

Conservation of linear momentum

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10.

Using the Law of Areas, if r_P and v_P are the distance and speed at perihelion, and r_A and v_A at aphelion, the relation between them is:

A.

v_P / v_A = r_A / r_P (since L = mr·v is conserved when r ⊥ v at apsides)

B.

v_P / v_A = r_P / r_A

C.

v_P × r_P² = v_A × r_A²

D.

v_P = v_A (speed is constant throughout orbit)

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11.

A planet at perihelion (closest point) has speed v_P and distance r_P from the Sun. At the aphelion r_A = 3r_P. The speed at aphelion is:

A.

v_A = v_P/3

B.

v_A = 3v_P

C.

v_A = v_P/9

D.

v_A = v_P√3

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12.

A comet has maximum speed v₁ at perihelion (distance r₁) and minimum speed v₂ at aphelion (distance r₂). The areal velocity of the comet is:

A.

½r₁v₁ = ½r₂v₂ = constant = L/(2m)

B.

r₁v₁² = r₂v₂²

C.

r₁²v₁ = r₂²v₂

D.

r₁v₁ + r₂v₂ = constant

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Kepler’s Law of Planetary Motion NEET Questions

Kepler’s Law of Planetary Motion MCQ Questions