Solar System

21.	In terms of size, what is the place of the Earth in the Solar System?
	A. 3
	B. 4
	C. 5
	D. 6 Option “C” is correct. While Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.

22.	Which planet is also known as the ‘Blue Planet’?
	A. Earth
	B. Uranus
	C. Mars
	D. Venus Option “A” is correct. Over 71 percent of the Earth is covered with water. Therefore from it appears blue and so Earth is called the ‘Blue Planet’.

23.	Earth is located-
	A. between Venus and Mars
	B. between Mars and Jupiter
	C. between Venus and Jupiter
	D. between Mercury and Venus Option “A” is correct. Earth is the third planet from the Sun and it is in between and Mars. Earth is the fifth-largest planet in the solar system. The equator is an imaginary circle that divides Earth into two halves. The diameter of the earth is about 8,000 miles

24.	On which day is the Earth closest to the Sun?
	A. 4th of July
	B. 21th March
	C. 23rd December
	D. 3rd January Option “D” is correct. The correct answer is 3rd January. Perihelion is a point in the orbit of a planet at which the planet is closest to the sun. On 3rd January, the earth is nearest to the sun (147 million km).

25.	The Earth is at its maximum distance from the Sun –
	A. of 30 January
	B. on 22 Dec
	C. on 20 September
	D. on 4 July Option “D” is correct. Bottom line: Planet Earth reaches its most distant point from the sun for 2022 on July 4. Astronomers call this yearly point in Earth’s orbit our aphelion

26.	The Earth revolves around the Sun approximately –
	A. 365.12 days
	B. 365.25 days
	C. 365.50 days
	D. 365.75 days Option “B” is correct. Earth revolves around the sun in 365 days, 5 hours, 59 minutes and 16 seconds.

27.	Earth’s natural satellite is –
	A. Aryabhata
	B. Rohini
	C. Moon
	D. Mars Option “C” is correct. The Moon. Any large object that orbits around a planet is called a moon (small ‘m’). The Earth has one moon called the Moon (capital ‘M’). The Moon takes 27.3 days to orbit the Earth once, moving at an orbital speed of 1 km/s.

28.	The reason for the existence of day and night is-
	A. Earth’s rotation on its axis
	B. motion of the sun relative to the earth
	C. tilt of earth’s axis
	D. rotation of the earth around the sun Option “A” is correct. The Earth orbits the sun once every 365 days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not its orbiting around the sun. The term ‘one day’ is determined by the time the Earth takes to rotate once on its axis and includes both day time and night time

29.	Light from the nearest star other than the Sun reaches the Earth?
	A. 4.2 seconds
	B. 42 seconds
	C. 4.2 years
	D. 42 years Option “C” is correct. Light from the nearest star reaches the earth in 4.2 years. The closest star to Earth are three stars in the Alpha system.

30.	What is the distance of the Earth from the Sun?
	A. 107.7 million km
	B. 142.7 million km
	C. 146.7 million km
	D. 149.6 million km Option “D” is correct. As noted earlier, Earth’s average distance to the Sun is about 93 million miles (150 million kilometers) from the Sun. That’s 1 AU

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