universe & solar system section 1 Practice Questions Answers Test with Solutions & More Shortcuts

Question : 11

What is meant by the term “Midnight Sun”?

a) Very bright moon

b) Sun shining in the polar circle for long time

c) Rising sun

d) Twilight

Answer: (a)

Midnight Sun Occurs in Polar region in Summer months where sun remains visible at local midnight.

Question : 12

Which one of the following statements is correct with reference to our solar system?

a) The Sun contains 75 percent of the mass of the solar system.

b) The diameter of the sun is 190 times that of the Earth.

c) The predominant element in the composition of Earth is silicon.

d) The earth is the densest of all the planets in our solar system.

Answer: (d)

The Earth is the densest planet in the solar system. The density of Earth is 5.513g/cm3. This is an average of all the material on the planet.

Question : 13 [NDA/NA 2013-II]

Statement I:
Doldrums is a calm belt between 5°N and 5°S of the equator.
Statement II:
The sun rays strike almost vertically over the equator throughout the year.
Code:

a) Statement I is true but Statement II is false.

b) Statement I is false but Statement II is true.

c) Both the statements are individually true but Statement II is not correct explanation of Statement I

d) Both the statements are individually true and Statement II is the correct explanation of Statement I

Answer: (c)

Doldrums a zone of light, calm (westerly) winds in equatorial latitude, applicably largely to oceans, moves few degrees N and S of the equator. Sun fall vertically over the equator, causing 12 hour day 12 hour night.

Question : 14 [UP UDA/LDA (Pre) 2006]

Every Solar eclipse occurs on

a) Amavasya only

b) Poornima only

c) Both (A) and (B)

d) Neither (A) nor (B)

Answer: (a)

Question : 15 [NDA 2014-II]

Statement I :
Sideral day is shorter than Solar day.
Statement II :
The motion of the Earth in its orbit around the Sun is termed as revolution.
Code:

a) Statement I is true but statement II is false.

b) Statement I is false but Statement II is true

c) Both the statements are individually true but statement II is not the correct explanation of statement I

d) Both the statements are individually true and statement II is the correct explanation of statement I

Answer: (c)

The sideral day is the time it takes for the Earth to complete one rotation about its axis with respect to the ‘fixed’ stars.

By fixed, we mean that we treat the stars as if they were attached to an imaginary celestial sphere at a very large distance from the Earth. A measurement of the sidereal day is made by noting the time at which a particular star passes the celestial meridian (i.e. directly overhead) on two successive nights.

On Earth, a sidereal day lasts for 23 hours 56 minutes 4.091 seconds, which is slightly shorter than the solar day measured from noon to noon. At the same time that the Earth spins on its axis, it also orbits or revolves around the Sun. This movement is called revolution.

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