1. The equatorial diameter of Earth is: 12, 100 km 6, 796 km 142,800 km 12, 756 km Ans- 12, 756 km 2. Which planet takes the longest time to complete one revolution around the sun? Uranus Mars Neptune Saturn Ans- Neptune 3. The planet with two moons is: Mercury Earth Venus Mars Ans- Mars 4. A celestial body in space that orbits around a planet is called a: Star Constellation Natural Satellite Asteroid Ans- Natural Satellite 5. Mercury is the smallest planet of the solar system. TRUE FALSE Ans- TRUE 6. The third planet from the Sun is: Mars Earth Jupiter Venus Ans- Earth