universe & solar system section 1 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Answer: (d)

The distance between two consecutive longitudes at the poles is 0 KM. A degree of longitude is widest at the equator at 69.172 miles (111.321) and gradually shrinks to zero at the poles.

Answer: (b)

The simplest model for the shape of the entire Earth is a sphere. The Earth’s radius is the distance from Earth’s center to its surface, about 6,371 kilometers (3,959 mi).

Earth is only approximately spherical, so no single value serves as its natural radius. Since the Earth is flattened at the poles and bulges at the equator, geodesy represents the shape of the earth with an oblate spheroid.

The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis.

Answer: (b)

Answer: (b)

The approximately diameter of Earth is 12800 km. The rotation of the planet has slightly flattened it out, so it has a larger diameter at the equator than at the poles.

The equatorial diameter of Earth is 12,756 km, its polar diameter is 12,713 km, and its average diameter, which is referred to in common usage, is 12,742 km or 7,926 miles.