universe & solar system section 7 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 13

Question : 26

Which of the following elements occurs the most abundantly in our universe?

a) Nitrogen

b) Helium

c) Oxygen

d) Hydrogen

Discuss »

Answer: (d)

Question : 27

What is true about the equinox ?

a) Vertical sun over the equator

b) Continuous day in the polar regions

c) Vertical sun over the Tropic of Capricorn

d) Vertical sun over the Tropic of Cancer

Discuss »

Answer: (a)

Question : 28

Consider the following statements:

  1. The Sun is the heart spot of the Solar system which is the source of energy of all organism of the earth.
  2. The innermost layer of the Sun is called Corona.
Which of the above statement(s) is/are correct?

a) Both 1 and 2

b) Neither 1 nor 2

c) 2 only

d) 1 only

Discuss »

Answer: (d)

The sun is the heart spot of the solar system which is the source of energy of all organisms of the earth. The Sun produces energy by the nuclear fusion of hydrogen into helium in its core.

It means that, since there is a huge amount of hydrogen in the core, these atoms stick together and fuse into a helium atom. This energy is then radiated out from the core and moves across the solar system.

Question : 29 [SSC SO 2008]

The moon is showing its same face to the earth because

a) Its periods of rotation and revolution are the same

b) Its rotation is faster than its revolution

c) Its rotation and revolution are opposite

d) It is not rotating about its own axis

Discuss »

Answer: (a)

Because it is “tidally-locked” to the Earth. The Earth’s gravity slows down the moon’s rotation so that it rotates at the same speed as it revolves around the Earth.

Imagine a person who walks around a center pole, but shifts their body so they are always facing it as they walk.

Question : 30

The Blue Moon phenomenon occurs

a) when four full moons appear in two consecutive months of the same calendar year.

b) None of the above

c) when two full moons appear in the same month thrice in a calendar year.

d) when two full moons occur in the same month.

Discuss »

Answer: (d)

The Blue Moon phenomenon occurs when two full moons occur in the same month. A blue moon is an extra full moon that appears in a subdivision of a year, either the third of four full moons in a season or, recently, a second full moon in a month of the common calendar.

The phrase has nothing to do with the actual color of the moon, although a literal “blue moon” (the moon appearing with a tinge of blue) may occur in certain atmospheric conditions; e.g., when there are volcanic eruptions or when exceptionally large fires leave particles in the atmosphere.

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