universe & solar system section 4 MCQ Questions & Answers Detailed Explanation

Answer: (b)

The anticlock wise rotation of Earth deflects winds to the right in the northern hemisphere and to the left in the southern hemisphere

Answer: (c)

The time taken by the Earth to complete one rotation on its axis is 23 hr-56 min 4 sec.

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: (c)

Answer: (b)

The sun radiates vast quantities of energy into space, across a wide spectrum of wavelengths. Most of the radiant energy from the sun is concentrated in the visible and near-visible parts of the spectrum.

The narrow band of visible light, between 400 and 700 nm, represents 43% of the total radiant energy emitted. Wavelengths shorter than the visible account for 7 to 8% of the total, but are extremely important because of their high energy per photon. The shorter the wavelength of light, the more energy it contains.

Answer: (b)

The planet Pluto has been declared a dwarf planet at the summit held in Prague. In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of a “dwarf planet.”

This means that from now on only the rocky worlds of the inner Solar System and the gas giants of the outer system will be designated as planets.