universe & solar system section 13 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Answer: (a)

Answer: (a)

When the Sun is vertically above the equator, the day is of equal length all over Earth. This happens twice a year, and these are the “equinoxes” in March and in September. Between the two tropic zones, which include the equator, the Sun is directly overhead twice per year.

Outside the tropic zones, whether to the south or north, the Sun is never directly overhead.

Answer: (d)

The International Date line is an imaginary line which go through the North pole to the South pole. It is 180º away from the Greenwich Meridian.

Answer: (d)

These measurements confirm geophysical models that say that the temperature difference between the solid core and the mantle above must be at least 1,500° C to explain why the earth has a magnetic field.

The research team, which was led by Agnes Dewaele from the CEA, a French technological research organization, used X-rays from the European Synchrotron Radiation Facility (ESRF) in Grenoble, France, as a key investigating tool.

Answer: (d)

Ganymede is the largest satellite in the solar system. Ganymede is a satellite of Jupiter and the largest moon in the Solar System.

It is the seventh moon and third Galilean satellite outward from Jupiter. Completing an orbit in roughly seven days, Ganymede participates in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.

It has a diameter of 5,268 km (3,273 mi), 8% larger than that of the planet Mercury, but has only 45% of the latter’s mass.