## Kepler's laws-Basic

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. Which of the following astronomer first proposed that sun is static and earth rounds sun

•  Copernicus
•  Kepler
•  Galilio
•   None

Copernicus

Q2. The period of a satellite in a circular orbit of radius R is T, the period of another satellite in a circular orbit of radius 4R is

•  4 T
•  T / 4
•  8 T
•  T / 8

8T

Q3. Kepler’s second law is based on

•  Newton’s first law
•   Newton’s second law
•  Special theory of relativity
•   Conservation of angular momentum

Conservation of angular momentum

Q4. The eccentricity of earth’s orbit is 0.0167. The ratio of its maximum speed in its orbit to its minimum speed is

•  2.507
•  1.033
•  8.324
•  1.000

1.033

Q5. For a planet around the sun in an elliptical orbit of semi – major and semi – minor axes a and b, respectively, and period T

•  The torque acting on the planet about the sun is non – zero
•  The angular momentum of the planet about the sun is constant
•  The areal velocity is Ï€ab/T
•  The planet moves with a constant speed around the sun

The angular momentum of the planet about the sun is constant The areal velocity is Ï€ab/T

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