Solar System

151.	In how much time does the Earth complete one rotation on its axis?
	A. 24 hour
	B. 23h 56m 4s
	C. 23 hours 30 minutes
	D. 23 h 10 min 2 sec Option “B” is correct.

152.	The duration of day and night on earth is equal-
	A. at the poles
	B. at the equator
	C. on the Tropic of Capricorn
	D. on the tropic of cancer Option “B” is correct. 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.

153.	Equinox means the date when –
	A. Day and night are of equal duration.
	B. The days are longer than the nights.
	C. The night is longer than the day.
	D. It has the shortest day and shortest night of the year. Option “A” is correct. There are only two times of the year when the Earth’s axis is tilted neither toward nor away from the sun, resulting in a “nearly” equal amount of daylight and darkness at all latitudes. These events are referred to as Equinoxes

154.	When is the longest day in the Southern Hemisphere?
	A. 21 June
	B. 23 September
	C. 21 March
	D. 22 December Option “D” is correct. 22nd December has the longest day and the shortest night. The earth is tilted on its axis by 66.5 degrees.

155.	The inclination of the earth’s axis to the plane of the earth’s orbit is –
	A. 90°
	B. 23½°
	C. 0°
	D. 66½° Option “D” is correct. The axis of the Earth is tilted at an angle of 23 1/2° from a perpendicular to the orbital plane. This tilting of the axis is called the inclination of the Earth’s axis. Due to this inclination, the axis of the Earth makes an angle of 66 1/2° with the plane of the Earth’s orbit.

156.	What is the number of satellites of the earth?
	A. Zero
	B. One
	C. Two
	D. Eight Option “B” is correct. The heavenly body which rotates around a planet in its own orbit is called the natural satellite. Earth has the moon which is only the one natural satellite.

157.	Daylight appears on the North Pole on June 21 –
	A. 0 hours
	B. 12 hours
	C. 18 hours
	D. 24 hour Option “D” is correct. The North Pole (90 degrees north latitude) receives 24 hours of daylight, as it has been daylight at the North Pole for the last three months (since the March Equinox). The sun is 66.5 degrees off the zenith or 23.5 degrees above the horizon.

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

159.	Which planet is the third in terms of distance?
	A. Uranus
	B. Venus
	C. Earth
	D. Mars Option “C” is correct. The Earth is sometimes called “the third planet” because it is the third planet in distance away from the Sun. As you can see from the picture below, in our Solar System, Mercury is closest to the Sun, followed by Venus, then Earth and then Mars.

160.	How many degrees does the Earth make an angle with its axis to the orbital plane while revolving on its orbital path?
	A. 23½°
	B. 66½°
	C. 90°
	D. 0° Option “B” is correct. The earth’s axis of rotation is tilted 66.5 degrees with respect to its orbital plane around the sun and its axis of rotation is inclined 23.5 degrees from the perpendicular, with respect to this plane.

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