universe & solar system section 1 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 : 6 [NDA/NA 2016-I]

According to the Geo-scientists, the shape of the earth is:

  1. round
  2. spherical
  3. close to that of a sphere
  4. an oblate ellipsoid
Select the correct answer using the code given below:

a) 1 and 2 only

b) 3 and 4 only

c) 1, 2 and 3

d) 2, 3 and 4

Discuss »

Answer: (b)

The simplest model for the shape of the entire Earth is a sphere. The Earth’s radius is the distance from Earth’s center to its surface, about 6,371 kilometers (3,959 mi).

Earth is only approximately spherical, so no single value serves as its natural radius. Since the Earth is flattened at the poles and bulges at the equator, geodesy represents the shape of the earth with an oblate spheroid.

The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis.

Question : 7 [SSC CPU SI 2008]

The number of staellites of the planet is Mercury is

a) 2

b) 16

c) 1

d) 0

Discuss »

Answer: (d)

The nearness of Mercury to the massive gravity influence of the Sun is the likely reason that no natural satellites are present, although it is possible that one or more may have existed in the past.

Question : 8

Which one of the following conditions is most relevant for the presence of life on mars?

a) Occurrence of ice cap and frozen water

b) Occurrence of ozone

c) Thermal conditions

d) Atmospheric composition

Discuss »

Answer: (a)

Question : 9

The Astronaut looks the sky in the space

a) Red

b) White

c) Black

d) Blue

Discuss »

Answer: (c)

The sky looks black from the space. In space, sunlight or any kind of star light does not have anything from which to bounce off.

Question : 10

By how much degree the earth is inclined on its own Axis

a) 241/2

b) 691/2

c) 661/2

d) 231/2

Discuss »

Answer: (d)

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