universe & solar system section 8 Practice Questions Answers Test with Solutions & More Shortcuts

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

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Question : 11 [SSC LDEO & LCD 2011]

‘Super nova’ is

a) an exploding Star

b) a black hole

c) an asteroid

d) a comet

Discuss »

Answer: (a)

A supernova is a stellar explosion that is more energetic than a nova. During this short interval, a supernova can radiate as much energy as the Sun is expected to emit over its entire life span.

The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light).

Question : 12

On which date is the earth in perihelion ?

a) January 3

b) July 4

c) Dec 22

d) June 21

Discuss »

Answer: (a)

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

Question : 13 [SSC CML (PRE) 2000]

The planet emitting green light is

a) Uranus

b) Neptune

c) Venus

d) Jupiter

Discuss »

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 : 14

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

Discuss »

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 : 15

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

Discuss »

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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