universe & solar system section 12 Practice Questions Answers Test with Solutions & More Shortcuts

Universe, solar system and Astronomy PRACTICE TEST [13 - EXERCISES]

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universe & solar system section 12

universe & solar system section 13

Question : 41 [NDA 2011-II]

When we consider 15° meridian on a world map or globe and count them in an Eastward direction starting with Greenwich meridian (0°), we find that the time of this meridian is

a) 1 hour slow

b) 12 hours fast

c) 1 hour fast

d) same as Greenwich

Discuss »

Answer: (c)

Time is advance towards the east as Earth rotates west to east

Question : 42 [PCS (Pre) 2002]

When the length of day and night is equal the Sunrays falls perpendicular at

a) South pole

b) Tropic of cancer

c) Equator

d) North pole

Discuss »

Answer: (c)

Question : 43

What causes the change of seasons?

a) Earth’s revolution and inclination of its axis

b) Earth’s rotation and inclination of its axis

c) Earth’s revolution

d) Earth’s rotation and revolution

Discuss »

Answer: (a)

The revolution of the earth around the sun alone is not enough for a change of seasons. Had the axis of the earth been vertical, the sun would have been vertical at the same latitude throughout the year.

Therefore the revolution of the earth and its inclination, both are necessary for the change of seasons.

Question : 44

The outermost layer of the sun is called

a) Lithosphere

b) Corona

c) Photosphere

d) Chromosphere

Discuss »

Answer: (b)

The outermost layer of the sun is called corona. A corona is a type of plasma that surrounds the Sun and other celestial bodies. The Sun’s corona extends millions of kilometers into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph.

Question : 45 [NDA 2010-I]

An Earthquake epicentre is the

a) approximate centre of a group of related Earthquakes

b) point on the surface directly above where the rupture along the fault zone occur

c) point within the Earth where the movement along the fault occurs

d) point where the seismograph is located

Discuss »

Answer: (b)

The epicenter is the point on the Earth’s surface where an earthquake explosion originates.

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