Olympiad Test Level 2: Earth and Universe- 2 - Class 4 MCQ

Jupiter is the largest planet. Venus is the brightest planet because sunlight is reflected by its clouds and it is near to Earth which makes it brightest planet. Earth is the densest planet. Mercury is the smallest planet.

On Mars, you would weigh roughly two-thirds less than your weight on Earth. This is because Mars has a weaker gravitational pull compared to Earth, about 38% of Earth's gravity, making you feel much lighter there.

GPS stands for Global Positioning System. It is a satellite-based navigation system that helps determine the exact location of a device on Earth by using signals from satellites orbiting the planet.

The Earth is in the Milky Way Galaxy, which is a spiral galaxy that contains our solar system along with billions of other stars and their planetary systems.

Comets revolve around the sun in oval shape orbit. They follow elliptical orbits and are made up of ice, dust, and rocky material. As they approach the Sun, they heat up, causing their ice to vaporize and create a visible tail.

Light travels through space at just over 186,000 miles per second. The moon is just under 250,000 miles from Earth, so light from the Moon's surface has to travel more than one second (about 1.3 seconds) to reach us.

However, note that Jupiter is listed in the options, but it is not an inner planet. The inner planets (also called terrestrial planets) include Mercury, Venus, Earth, and Mars, with Earth being the largest among them. Jupiter is a gas giant and belongs to the outer planets.

Among the given options Saturn has maximum number of Satellites(146).

• Saturn is the second-largest planet in the solar system.
• Ganymede is the largest satellite in the solar system. It is a moon of Jupiter.

Moon does not produce its own light. Moonlight is because of Sun’s light that shines on it and bounces off. 

Mercury takes 88 days to complete one revolution around the Sun. This is because it is the closest planet to the Sun, and its orbit is much shorter than that of Earth.