Solar System

141.	On which of the following dates, the rays of the sun fall directly on the equator?
	A. All the year
	B. March 21
	C. September 23
	D. March 21 and September 23 Option “D” is correct. On 21st March and September 23rd, direct rays of the sun fall on the equator. At this position, neither of the is tilted towards the sun; so, the whole earth experiences equal days and equal nights. This is called an equinox

142.	Which of the following stars is closest to the Earth?
	A. Pole Star
	B. Alpha century
	C. Sun
	D. Lubdhak Option “C” is correct.

143.	Who first proposed that the Sun is the center of our solar system and the Earth revolves around it?
	A. Newton
	B. Galileo
	C. Panini
	D. Copernicus Option “D” is correct. Nicolaus Copernicus proposed his theory that the planets revolved around the sun in the 1500s, when most people believed that Earth was the center of the universe.

144.	When the duration of day and night is equal, the sun’s rays fall straight on –
	A. At the North pole
	B. Equator
	C. At the South Pole
	D. On the Tropic of cancer Option “B” is correct. These events are referred to as Equinoxes. The word equinox is derived from two Latin words – aequus (equal) and nox (night). At the equator, the sun is directly overhead at noon on these two equinoxes.

145.	What would be the color of the sky if the atmosphere is considered to be removed between the Earth and the space?
	A. Blue
	B. Red
	C. White
	D. Black Option “D” is correct. With no atmosphere, the background sky would be black because all the light from the sun and other sources would follow straight paths to your eye.

146.	The circumference of the earth is
	A. 35000 km
	B. 40075 km
	C. 45000 km
	D. 47050 km Option “B” is correct. The distance between the north and south poles is approximately 7900 miles while the equatorial diameter is slightly larger at 7930 miles. The circumference of the Earth is just its average diameter, 7915 miles, times the number pi, where pi is 3.14159. This gives us about 40075 km for the Earth’s circumference.

147.	On which date is the longest day in the northern hemisphere?
	A. 21 June
	B. 22 December
	C. 23 September
	D. 21 March Option “A” is correct. About June 21 the sun is over the Tropic of Cancer by giving the northern hemisphere its longest day.

148.	On which date is the shortest day in the Northern Hemisphere?
	A. 21 March
	B. 21 June
	C. 23 September
	D. 22 December Option “D” is correct. Winter Solstice 2022, the first day of winter in the Northern Hemisphere, will occur on Thursday, 22 December, 2022. This marks the beginning of longer days and shorter nights. Astronomical, December 22 will be the shortest day of this year.

149.	The duration of the day at the poles is-
	A. 3 months
	B. 6 months
	C. 9 months
	D. 12 months Option “B” is correct. The poles experience six months of the day and six months of the night. This is due to the fact that earth is tilted on its axis. Also, due to this, each pole is tilted towards and away from the sun for about six months.

150.	Which of the following planets has the highest average density?
	A. Jupiter
	B. Mars
	C. Earth
	D. Uranus Option “C” is correct. Mercury and Earth are the densest planets in the Solar System (Figure 13) with densities similar to the iron-rich mineral haematite. Saturn, the least dense planet in the Solar System on the other hand, has a density lower than that of water.

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