universe & solar system section 2 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

The twinkling of a star is due to

a) the transit of other celestial objects across the line of sight.

b) the atmospheric refraction of starlight.

c) the variation in the composition of the star with time.

d) the variation in the intensity of light emitted by it with time.

Discuss »

Answer: (b)

The twinkling of stars is due to the atmospheric refraction of stars. Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from the star is refracted in different directions. This causes the star’s image to change slightly in brightness and position, hence “twinkle.”

This is one of the reasons the Hubble telescope is so successful: in space, there is no atmosphere to make the stars twinkle, allowing a much better image to be obtained.

Question : 37 [IAS (Pre) 1995]

Meteor is a

a) Part of stellar system

b) Tailles Comet

c) A piece of matter which has entered the Earth atmosphere from outer space

d) Fast moving star

Discuss »

Answer: (c)

Question : 38

On which date is the earth in perihelion ?

a) January 3

b) July 4

c) Dec 22

d) June 21

Discuss »

Answer: (a)

Question : 39

Which one of the following is the largest satellite in solar system?

a) Europa

b) Triton

c) Titan

d) Ganymede

Discuss »

Answer: (d)

Ganymede is the largest satellite in the solar system. Ganymede is a satellite of Jupiter and the largest moon in the Solar System. It is the seventh moon and third Galilean satellite outward from Jupiter.

Completing an orbit in roughly seven days, Ganymede participates in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.

It has a diameter of 5,268 km (3,273 mi), 8% larger than that of the planet Mercury, but has only 45% of the latter’s mass.

Question : 40

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)

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