Kepler’s Law of Planetary Motion NEET Questions

Physics - Gravitation

Kepler’s Law of Planetary Motion MCQ Questions


7.
For any point T on an ellipse with foci F₁ and F₂, which mathematical property defines the ellipse?
A.
F₁T - F₂T = constant
B.
F₁T × F₂T = constant
C.
F₁T + F₂T = constant (= 2a, the major axis)
D.
F₁T / F₂T = constant
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ANSWER :
C. F₁T + F₂T = constant (= 2a, the major axis)
8.
A satellite moves around a planet in a circular orbit under the influence of gravitational force alone. Its time period depends on:

NEET - 2022

A.
Mass of the satellite
B.
Radius of the orbit
C.
Orbital speed of the satellite
D.
Mass of the planet
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ANSWER :
D. Mass of the planet
9.
If the semi-major axis of a planet’s orbit is doubled, its time period will:

NEET - 2019

A.
Remain the same
B.
Double
C.
Increase by a factor of 2.8
D.
Increase by a factor of 4
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ANSWER :
C. Increase by a factor of 2.8
10.
In an elliptical orbit, the CLOSEST point of a planet to the Sun is called:
A.
Aphelion
B.
Perihelion
C.
Semi-major axis
D.
Focus
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ANSWER :
B. Perihelion
11.
The semi-major axis of an elliptical orbit is defined as:
A.
The distance from one focus to the centre of the ellipse
B.
Half the length of the longer axis (PA/2, where P is perihelion and A is aphelion)
C.
The perpendicular distance from the centre to the ellipse
D.
The distance between the two foci
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ANSWER :
B. Half the length of the longer axis (PA/2, where P is perihelion and A is aphelion)
12.
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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ANSWER :
A. e = 0 for a circle, 0 < e < 1 for an ellipse, e = 1 for a parabola