universe & solar system section 10 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 : 36

Consider the following statements.

  1. The tropical year is shorter than the sidereal year.
  2. The solar day is longer than the sidereal day.
Which of the statements given above is/are correct?

a) Both 1 and 2

b) Neither 1 nor 2

c) 2 only

d) 1 only

Discuss »

Answer: (d)

1 Sidereal year = 365.2564 days;

1 Tropical year = 365.2422 days;

So difference is 0.0142 days.

Question : 37 [PCS (Pre) 2011]

Among the following which planet takes maximum time for one revolution around the Sun?

a) Mars

b) Venus

c) Jupiter

d) Earth

Discuss »

Answer: (c)

Question : 38 [SSC CGLT 2011]

The outermost layer of the Sun is called

a) Corona

b) Lithosphere

c) Photosphere

d) Chromosphere

Discuss »

Answer: (a)

The outermost layer of the sun is the corona. Only visible during eclipses, it is a low-density cloud of plasma with higher transparency than the inner layers. The white corona is a million times less bright than the inner layers of the sun but is many times larger.

A corona is a type of plasma “atmosphere” of the Sun or other celestial body, extending millions of kilometers into space, most easily seen during a total solar eclipse, but also observable in a coronagraph.

The word “corona” itself derived from Latin, meaning crown. The high temperature of the corona gives it unusual spectral features

Question : 39

Consider the following statements:

  1. When the Earth comes between the moon and the sun it is called solar eclipse.
  2. When the moon comes between the sun and the Earth it is called Lunar eclipse.
Which of the above statements regarding eclipse is correct?

a) 2 only

b) None

c) 1 and 2

d) 1 only

Discuss »

Answer: (b)

Lunar Eclipse:The moon is said to be in eclipse when the Earth comes between the moon and the sun. The shadow cast by the Earth on the moon is called an eclipse.
Solar Eclipse:The sun is said to be in eclipse when the Moon comes between the Sun and the Earth. There is either a partial or total obstruction of the Sun’s light when viewed from the Earth.

Question : 40

Which of the following is the nearest star of Earth?

a) Rigel

b) Vega

c) Sun

d) Sirius

Discuss »

Answer: (c)

The distance from sun to Earth is called an astronomical unit (AV) one of the Nearest star sirius is more than thousands of AV distance from Earth.

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