Why did Brahe hire Kepler as his research assistant?

• Because Brahe did not know how to interpret his data.

• Because Brahe did not have enough time in proving his theory.

• Because Brahe is a close friend of Kepler and needed a companion.

• Because Brahe needed Kepler to make mathematical calculations to prove his theory.

Which of the following is NOT a contribution of Brahe in the field of astronomy?

• He devised the first-ever telescope.

• He revolutionized astronomical instrumentation.

• He changed the observational practice profoundly.

• He designed, built, and calibrated astronomical instruments precisely.

Which among the following statements is CORRECT about the law of ellipses?

• Planets move in a circular orbit with the sun at the center.

• Planets move in an elliptical orbit with the sun as one of the foci.

• The period and the average distance are related by two-thirds power.

• The line joining the sun and the planet sweeps equal areas in equal times as the planet revolves around the sun.

Which law of planetary motion states that planets sweep equal areas of their orbit over equal time intervals?

• Law of ellipses

• Law of equal areas

• Law of periods

• Law of gravity

That the square of the orbital period of a planet is proportional to the cube of the mean distance from the sun is the statement of which law of planetary motion?

• Law of ellipses

• Law of equal areas

• Law of periods

• Law of gravity

Which of the following is NOT Brahe’s contribution?

• He made observations of a supernova in 1572.

• He made careful observation of a comet in 1577.

• He formulated the three laws of planetary motion.

• He designed and built astronomical instruments precisely.

Which of the following views of the universe was supported by the laws of planetary motion?

• Geocentric view

• Heliocentric view

• Tychonic view

• Geoheliocentric view

Based on the first law of planetary motion, what is the shape of the planetary orbits?

• Cone

• Circle

• Ellipse

• Rectangle

Which among Brahe’s contributions in astronomy paved the way for the formulation of Kepler’s Law of Ellipses?

• He made observations of a supernova in 1572.

• He made careful observation of a comet in 1577.

• He designed and built astronomical instruments precisely.

• He made observations of planetary motion, particularly that of planet Mars.

Which of the instruments below is not yet invented during Brahe’s time?

• Quadrant

• Telescope

• Compass

• Astrolabe