universe & solar system section 11 Practice Questions Answers Test with Solutions & More Shortcuts

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

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Question : 31 [SSC CHSL 2015]

Which of the following Scientist proved that the path of each planet around the Sun is elliptical?

a) Newton

b) Copernicus

c) Galileo

d) Kepler

Discuss »

Answer: (d)

According to Kepler’s First law (Law of Orbits), each planet revolves around the sun in an elliptic orbit, the sun occupying one of the Foci. The elliptical shape of the orbit is a result of the inverse square force of gravity. Kepler’s laws were derived for orbits around the sun, but they apply to satellite orbits as well.

Question : 32

Which one of the following planets is nearest to the earth?

a) Mars

b) Uranus

c) Venus

d) Mercury

Discuss »

Answer: (c)

Question : 33

The planet whose period of rotation is longer than the period of revolution around the sun is

a) Venus

b) Neptune

c) Mars

d) Mercury

Discuss »

Answer: (a)

Venus is the planet whose period of rotation is longer than the period of revolution around the sun. The period of rotation for Venus is 243 days. In other words, Venus takes 243 days to turn once on its axis so that the stars are in the same position in the sky.

Question : 34

Study the following statements about the interior of the earth and select the correct answer from the codes given below:

  1. The average density of the outer crust is 2.8.
  2. The crust is separated from the mantle by the Gutenberg discontinuity.
  3. There is sudden increase in the velocity of P waves along the mantle core boundary.
  4. The inner core of the earth is in molten state.
Codes:

a) 1 and 3

b) 3 and 4

c) 2 and 3

d) 1 and 2

Discuss »

Answer: (a)

The Earth is formed of three concentric layers: the core, the mantle, and the crust; these are separated by transition zones called discontinuities.

The Earth’s inner core is the Earth’s innermost part and according to seismological studies, it has been believed to be primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 70% of the Moon’s radius. Moho discontinuity is the boundary between the Earth’s crust and Mantle.

Question : 35

Diamond ring is a phenomenon observed:

a) only along the peripheral regions of the totality trail

b) only in the central regions of the totality trail

c) at the end of a total solar eclipse

d) at the start of a total solar eclipse

Discuss »

Answer: (a)

Diamond ring is observed during solar eclipse, only along the peripheral regions of the totality trail.

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