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

Question : 21

The solar eclipse achieves totality only in limited geographical regions because

a) The trajectories of the earth around the sun and the moon around the earth are not perfect circles

b) Sun rays can reach most of the peripheral regions of shadow of the moon due to atmospheric refraction

c) The earth is not smooth flat surface, but has elevations and depressions

d) The size of the shadow of the moon on the earth is small as compared to the cross section of the earth

Question : 22 [NDA 2012-II]

Why do we have a leap year every four years?

a) The length of a year is not an integer number of days

b) It is a convention

c) The revolution slows down a little once every four years

d) The Earth gets shifted out of orbit every four year

Question : 23 [SSC LDEO & LCD 2011]

Which planet in our solar system is nearly as big as the earth ?

a) Venus

b) Pluto

c) Mars

d) Mercury

Question : 24 [NDA 2013-I]

Nearly 30% of the solar radiations return back to the space without contributing anything to the Earth’s surface temperature. This amount of radiation is known as

a) Earth’s albedo

b) mesopause

c) tropopause

d) Black body

Question : 25 [PSC (Pre) 2019 ]

Time Saturn takes to complete one revolution around the Sun

a) 29.5 years

b) 84 years

c) 36 years

d) 18.5 years