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

Answer: (a)

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.

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)

A. Semeru Volcano is situated in Indonesia.

B. Cotopaxi Volcano is situated in Ecuador.

C. Etna Volcano is situated in Italy.

D. Kilimanjaro Volcano is situated in Kenya.

Answer: (d)

Yes, the planets orbit in or close to a plane around the sun called the ecliptic.

The ecliptic is inclined 7 degrees from the planet of the Sun’s equator.

Answer: (a)

Venus 'overtakes' the Earth every 584 days as it orbits the Sun.

As it does so, it changes from the 'Evening Star', visible after sunset, to the 'Morning Star', visible before sunrise.