universe & solar system section 2 Practice Questions Answers Test with Solutions & More Shortcuts

Question : 31 [UPPCS (Mains) 2009]

The ‘blue Moon’ phenomenon occurs when

a) Two full Moon appear in the same month, thrice in a calendar

b) None of the above

c) Four full Moons appear in two consecutive months of the same calendar year

d) Two full Moons occur in the same month

Answer: (b)

Question : 32

Which of the following planets is called “Blue planet”?

a) Uranus

b) Mercury

c) Earth

d) Venus

Answer: (c)

Earth is called the ‘Blue Planet’ due to the abundant water on its surface. This is because liquid water covers most of the surface of the planet.

The Earth has the right mass, chemical composition, and location can support liquid water.

Question : 33 [IAS (Pre) 1997]

The Planet Mercury is revolving around the Sun in an elliptical orbit, as shown in the given figure. The Kinetic energy of Mercury is greatest at the point labelled

a) c

b) d

c) b

d) a

Answer: (d)

Question : 34

The colour of the star is an indication of its

a) Temperature

b) Luminosity

c) Distance from the sun

d) Distance from the earth

Answer: (a)

The colour of the star is an indication of its temperature. The glowing is caused by something called Black-Body radiation, which has to do with the heat energy trying to radiate away in more and more energetic wavelengths.

Red stars are relatively cool at only a few thousand degrees Celsius, white stars are hot at about ten thousand degrees, and blue stars are the hottest.

Question : 35 [NDA 2013-II]

Albedo effect would be relatively higher in

a) noon

b) late evening only

c) early morning only

d) early morning and late evening

Answer: (d)

Albedo also varies according to the angle of incidence of the Sun Rays being higher for slanting rays and lower for vertical or nearly vertical rays. From this we can derive that albedo will be relatively higher during early morning and late evening because at both times, Sun rays are slanting.

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