universe & solar system section 9 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Our solar system is located in the Orion arm of the milky way galaxy, about two-thirds of the way out from the center.

The sun is about 26,000 light-years from the center of the Milky Way Galaxy, which is about 80,000 to 120,000 light-years across (and less than 7,000 light-years thick). We are located on one of its spiral arms, out towards the edge.

It takes the sun (and our solar system) roughly 200-250 million years to orbit once around the Milky Way. In this orbit, we (and the rest of the Solar System) are traveling at a velocity of about 155 miles/sec (250 km/sec).

Answer: (a)

1. Moon is the satellite of Earth.
2. Ganymede is the satellite of Jupiter.
3. Tritan is the satellite of Neptune.
4. Titan is the satellite of Saturn.

Answer: (a)

Transformation of solar energy into heat requires some time, energy received by the earth from solar radiations continues to exceed the energy lost by outgoing long-wave radiations from the earth’s surface from 4.00p.m.

Answer: (d)

Answer: (c)

A ocean current is a continuous, directed movement of ocean water generated by the forces acting upon this mean flow, such as breaking waves, wind, coriolis effect, cabbeling, temperature and salinity differences and tides caused by the gravitational pull of the Moon and the Sun.

Answer: (d)

As the furthest orbiting planet in the Solar System,

• Neptune has the longest year, taking 164.8 Earth years to complete a single orbit of the Sun.
• Saturn has the most moons i.e. 62.
• Earth has 71% water.
• Venus has the longest day of any planet in our solar system. It completes one rotation every 243 Earth days. Its day lasts longer than its orbit. It orbits the Sun every 224.65 Earth days, so a day is nearly 20 Earth days longer than its year.