universe & solar system section 8 MCQ Questions & Answers Detailed Explanation

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The following question based on Universe, solar system and Astronomy topic of indian geography mcq

Questions : Study the following statements and select the correct answer from the codes given below:
  1. The average density of rocks in the lower crust of the earth is 3.
  2. There is a gradual decrease in the velocity of the seismic waves through the lower crust.
  3. The mantle-core boundary is marked by Moho-discontinuity.
  4. The outer core of the earth is in molten form.
Codes:

(a) 3 and 4 are correct

(b) 1 and 4 are correct

(c) 2 and 3 are correct

(d) 1 and 2 are correct

The correct answers to the above question in:

Answer: (b)

The crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle.

The Earth’s crust is composed of distinctly different continental crust and oceanic crust, which have different chemical compositions and physical properties, and which were formed by different geological processes.

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Read more universe solar system astronomy Based Indian Geography Questions and Answers

Question : 1

When there is noon at I.S.T. meridian people another place of the Earth are taking their 6 O’ clock morning tea. The longitude of the place is

a) 172°30’ E

b) 90° W

c) 7°30’ W .

d) 17°30’ E

Answer: (c)

Question : 2

The causes of Day and Night is

a) Tilt of Earth’s axis

b) Moon’s rotation

c) Rotation of Earth on its axis

d) Earth-rotation

Answer: (c)

Question : 3

The planet nearest to the sun is

a) Venus

b) Pluto

c) Earth

d) Mercury

Answer: (d)

The planet nearest to the sun is mercury. Mercury is the smallest and closest to the Sun of the eight planets in the Solar System, with an orbital period of about 88 Earth days.

Question : 4

The inexhaustible source of energy of the stars is due to

a) decay of radioactive elements

b) excess of oxygen that helps burning and release of energy

c) conversion of helium to hydrogen

d) conversion of hydrogen to helium

Answer: (d)

A star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star’s interior and then radiates into outer space.

Question : 5

The planet emitting green light is

a) Uranus

b) Neptune

c) Venus

d) Jupiter

Answer: (a)

The atmosphere of Uranus is composed of 83% hydrogen, 15% helium, 2% methane and small amounts of acetylene and other hydrocarbons. Methane in the upper atmosphere absorbs red light, giving Uranus its blue-green colour.

Question : 6

On which date is the earth in perihelion ?

a) January 3

b) July 4

c) Dec 22

d) June 21

Answer: (a)

The Earth is closest to the Sun or at the perihelion on January 3, when it is winter in the Northern Hemisphere.

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