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

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: (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)

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.

Answer: (d)

The albedo of an object determines its visual brightness when viewed with reflected light. Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space.

It is a measure of the reflectivity of the earth’s surface.

Answer: (a)

1. Big Bang Theory- Explosion occurred and the matter that flung from the explosion condensed into galaxies.
2. Inflation Theory- At one point in time, the matter of the universe started flying outward faster than the current speed of light.
3. Oscillating Universe Theory- Universe continuously expands and contracts.
4. The Steady-State Theory- As the universe expands, new matter is created to fill the leftover spaces.

Answer: (d)