Solar System

81.	Arrange the following in descending order of size and select the correct answer from the code given below – 1. Jupiter, 2. Uranus, 3. Earth, 4. Saturn
	A. 1, 4, 3, 2
	B. 4, 1, 2, 3
	C. 1, 4, 2, 3
	D. 4, 1, 3, 2 Option “C” is correct.

82.	Which is the twin planet of the Earth, which looks like Earth in size, density and mass?
	A. Venus
	B. Jupiter
	C. Mars
	D. Uranus Option “A” is correct. Venus is the second planet from the Sun and is Earth’s closest planetary neighbor. It’s one of the four inner, (or rocky) planets, and it’s often called Earth’s twin because it’s similar in size and density.

83.	The outermost layer of the Sun is called –
	A. Spectrum
	B. Circle of light
	C. Crown (corona)
	D. Lithosphere Option “C” is correct. Corona – The corona is the outermost layer of the Sun, starting at about 1300 miles (2100 km) above the solar surface (the photosphere). The temperature in the corona is 500,000 K (900,000 degrees F, 500,000 degrees C) or more, up to a few million K

84.	The ‘Blue Moon’ phenomenon occurs in –
	A. when there are two full moons in the same month
	B. when there are four full moons in two consecutive months in the same calendar year
	C. when there are two full moons in the same month thrice in a calendar year
	D. None of the above Option “A” is correct. A blue moon is the second full moon in a calendar month, and the period from one full moon to another is about 29 1/2 days. So, when two full moons occur in the same month, the first one is always on the first or second day of the month and the second one is on the 30th or 31st day.

85.	Which one of the following is the correct sequence of the given planets in the increasing order of their size (diameter)?
	A. Mars-Venus-Earth-Mercury-Uranus
	B. Mercury-Mars-Venus-Earth-Uranus
	C. Mercury-Mars-Venus-Uranus-Earth
	D. Venus-Mercury-Mars-Earth-Uranus Option “B” is correct.

86.	Which of the following statements is/are correct with respect to the Northern Hemisphere? 1. The vernal equinox occurs on March 21. 2. North Solstice occurs on 22 December. 3. Autumnal equinox occurs on 23rd September. 4. Southern Solstice occurs on 21st June. Select the correct answer from the code given below –
	A. only 1
	B. 1 and 2
	C. 2 and 4
	D. 1, 2 and 3 Option “B” is correct.

87.	Which of the following scientists proved that the path of each constellation around the Sun is a great circle?
	A. Kepler
	B. Galileo
	C. Newton
	D. Copernicus Option “A” is correct. The planets revolve around the sun in elliptical path known as orbit. These orbits were well defined by an astronomer Kepler.

88.	Three-fourth of the earth’s surface is in –
	A. Wind
	B. water
	C. Ice
	D. Sand Option “B” is correct. Nearly three-fourths of the earth’s surface is covered with water. 97% of the water on the Earth is salt water and only three percent is fresh water.

89.	Name the planet which is about 150 million km from the sun. is far ?
	A. Jupiter
	B. Venus
	C. Earth
	D. Mars Option “C” is correct. As noted earlier, Earth’s average distance to the Sun is about 93 million miles (150 million kilometers) from the Sun.

90.	How much of the world’s surface has water?
	A. 56%’
	B. 70%’
	C. 80%’
	D. 20%’ Option “B” is correct. About 70 percent of the Earth’s surface is water-covered, and the oceans hold about 96.5 percent of all Earth’s water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers.

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