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

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)

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: (b)

Answer: (a)

The color of the star is an indication of its temperature. The glowing is caused by something called Black-Body radiation, which has to do with the heat energy trying to radiate away in more and more energetic wavelengths.

Red stars are relatively cool at only a few thousand degrees Celsius, white stars are hot at about ten thousand degrees, and blue stars are the hottest.

Answer: (d)

• Uranus is a planet.
• Moon is a satellite.
• Halley is a comet.
• Mariner is an artificial satellite.

The Mariner program was a program conducted by the American space agency NASA in conjunction with Jet Propulsion Laboratory (JPL) that launched a series of robotic interplanetary probes designed to investigate Mars, Venus and Mercury from 1962 to 1973.

The program included a number of firsts, including the first planetary flyby, the first pictures from another planet, the first planetary orbiter, and the first gravity assist manoeuvre.

Answer: (c)

Earth is the Blue Planet because of the vast encompass of oceans on its surface. From space the oceans combined with the atmosphere make the planet look blue. 

The abundance of water on Earth's surface is a unique feature that distinguishes the 'Blue Planet' from others in the Solar System.